Internal structure and occurrence of accretionary lapilli — a case study at Laacher See Volcano
Identifieur interne : 000509 ( Istex/Corpus ); précédent : 000508; suivant : 000510Internal structure and occurrence of accretionary lapilli — a case study at Laacher See Volcano
Auteurs : Rolf Schumacher ; Hans-Ulrich SchminckeSource :
- Bulletin of Volcanology [ 0258-8900 ] ; 1991-11-01.
English descriptors
- KwdEn :
- Accretionary, Accretionary lapilli, Accretionary lapilli populations, April, Areal, Ashfall, Ashfall deposits, Ashfalls, Aspect ratios, Bogaard, Deposit, Different types, Discoidal, Elutriation, Eruption, Eruption clouds, Facies, Geol, Grain size, Ignimbrite, Ignimbrite overbank facies, Laacher, Lapillus, Maximum grain size, Middle laacher, Mlst, Overbank, Phreatomagmatic, Plinian, Proximal, Proximal deposits, Pumice, Pyroclastic, Pyroclastic flow, Pyroclastic flow deposits, Quaternary, Schmincke, Schumacher, Sieving, Surge deposits, Tephra, Ternary, Tuff, Upper laacher, Upper part, Upper parts, Vesicle, Vesiculated, Volcanol.
- Teeft :
- Accretionary, Accretionary lapilli, Accretionary lapilli populations, April, Areal, Ashfall, Ashfall deposits, Ashfalls, Aspect ratios, Bogaard, Deposit, Different types, Discoidal, Elutriation, Eruption, Eruption clouds, Facies, Geol, Grain size, Ignimbrite, Ignimbrite overbank facies, Laacher, Lapillus, Maximum grain size, Middle laacher, Mlst, Overbank, Phreatomagmatic, Plinian, Proximal, Proximal deposits, Pumice, Pyroclastic, Pyroclastic flow, Pyroclastic flow deposits, Quaternary, Schmincke, Schumacher, Sieving, Surge deposits, Tephra, Ternary, Tuff, Upper laacher, Upper part, Upper parts, Vesicle, Vesiculated, Volcanol.
Abstract
Abstract: Accretionary lapilli are common in fine-grained pyroclastic flow and surge deposits and related co-ignimbrite/co-surge ash layers of Laacher See volcano. Two morphologically different types are distin-guished: (1) Rim-type lapilli are composed of a coarse-grained core surrounded by a fine-grained rim. Rims are internally graded or made up of several layers of alternating fine and very-fine grained ash. (2) Core-type lapilli lack fine-grained rims. Field relationships, internal, and grain-size characteristics are specific to accretionary lapilli from different types of tephra deposits. Accretionary lapilli may therefore be a helpful tool to infer the origin of tephra of different origin. In co-ignimbrite ashfall, accretionary lapilli are generally concentrated at the base, whereas pyroclastic flow and surge deposits contain lapilli in the upper parts of individual, thin-bedded layers. Rim-type lapilli are found in pyroclastic flow and surge deposits up to 4 km from the source. Core-type lapilli occur at greater distances or are associated with vesiculated tuffs where they are within 1 km from the vent. Accretionary lapilli from co-ignimbrite/co-surge ash show open framework textures and edge-to-face contacts of individual ash particles. Vesicularity is generally low but the overall porosity of 40% to 50% results in an average density of 1200 kg/m3. Accretionary lapilli in pyroclastic flow and surge deposits are more densely packed and platy particles are often in face-to-face contacts. Vesicularity of those from pyroclastic flow deposits is significantly higher; the overall porosity is about 30% to 40% and the average density 1600 kg/m3. Grain-size analyses show that the accretionary lapilli in co-ignimbrite/co-surge ashfall deposits are the most fine-grained with a median (Md) of 20 to 30 μm and a maximum grain size of 250 to 350 μm. Accretionary lapilli from pyroclastic flow deposits have intermediate Md-values of 30 to 50 μm and a maximum grain size of 350 to 500 μm. Those of surge deposits are the coarsest grained with Md-values of 30 to >63 μm and a maximum grain size up to 2 mm.
Url:
DOI: 10.1007/BF00493689
Links to Exploration step
ISTEX:06F10A19476E0C694DE9296D6C7D1DA17079086DLe document en format XML
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Two morphologically different types are distin-guished: (1) Rim-type lapilli are composed of a coarse-grained core surrounded by a fine-grained rim. Rims are internally graded or made up of several layers of alternating fine and very-fine grained ash. (2) Core-type lapilli lack fine-grained rims. Field relationships, internal, and grain-size characteristics are specific to accretionary lapilli from different types of tephra deposits. Accretionary lapilli may therefore be a helpful tool to infer the origin of tephra of different origin. In co-ignimbrite ashfall, accretionary lapilli are generally concentrated at the base, whereas pyroclastic flow and surge deposits contain lapilli in the upper parts of individual, thin-bedded layers. Rim-type lapilli are found in pyroclastic flow and surge deposits up to 4 km from the source. Core-type lapilli occur at greater distances or are associated with vesiculated tuffs where they are within 1 km from the vent. Accretionary lapilli from co-ignimbrite/co-surge ash show open framework textures and edge-to-face contacts of individual ash particles. Vesicularity is generally low but the overall porosity of 40% to 50% results in an average density of 1200 kg/m3. Accretionary lapilli in pyroclastic flow and surge deposits are more densely packed and platy particles are often in face-to-face contacts. Vesicularity of those from pyroclastic flow deposits is significantly higher; the overall porosity is about 30% to 40% and the average density 1600 kg/m3. Grain-size analyses show that the accretionary lapilli in co-ignimbrite/co-surge ashfall deposits are the most fine-grained with a median (Md) of 20 to 30 μm and a maximum grain size of 250 to 350 μm. Accretionary lapilli from pyroclastic flow deposits have intermediate Md-values of 30 to 50 μm and a maximum grain size of 350 to 500 μm. Those of surge deposits are the coarsest grained with Md-values of 30 to >63 μm and a maximum grain size up to 2 mm.</div></front></TEI><istex><corpusName>springer</corpusName><keywords><teeft><json:string>lapillus</json:string><json:string>accretionary</json:string><json:string>accretionary lapilli</json:string><json:string>laacher</json:string><json:string>pyroclastic</json:string><json:string>tephra</json:string><json:string>surge deposits</json:string><json:string>ashfall</json:string><json:string>pyroclastic flow deposits</json:string><json:string>schmincke</json:string><json:string>facies</json:string><json:string>phreatomagmatic</json:string><json:string>overbank</json:string><json:string>sieving</json:string><json:string>pyroclastic flow</json:string><json:string>tuff</json:string><json:string>schumacher</json:string><json:string>pumice</json:string><json:string>vesicle</json:string><json:string>vesiculated</json:string><json:string>different types</json:string><json:string>elutriation</json:string><json:string>deposit</json:string><json:string>ignimbrite</json:string><json:string>ashfalls</json:string><json:string>geol</json:string><json:string>eruption</json:string><json:string>upper laacher</json:string><json:string>maximum grain size</json:string><json:string>quaternary</json:string><json:string>discoidal</json:string><json:string>grain size</json:string><json:string>upper parts</json:string><json:string>volcanol</json:string><json:string>ternary</json:string><json:string>proximal deposits</json:string><json:string>middle laacher</json:string><json:string>bogaard</json:string><json:string>april</json:string><json:string>aspect ratios</json:string><json:string>eruption clouds</json:string><json:string>areal</json:string><json:string>ashfall deposits</json:string><json:string>accretionary lapilli populations</json:string><json:string>mlst</json:string><json:string>plinian</json:string><json:string>ignimbrite overbank facies</json:string><json:string>upper part</json:string><json:string>proximal</json:string><json:string>volcano</json:string><json:string>areal distribution</json:string><json:string>vesiculated tuff layers</json:string><json:string>sigurdsson</json:string><json:string>other volcanoes</json:string><json:string>finegrained</json:string><json:string>pyroclastic flow deposit</json:string><json:string>enclose</json:string><json:string>surge</json:string><json:string>pyroclastic flows</json:string><json:string>accretionary deposits</json:string><json:string>particle texture</json:string><json:string>field relationships</json:string><json:string>flow deposits</json:string><json:string>coarse particles</json:string><json:string>average density</json:string><json:string>binding forces</json:string><json:string>accretionary lapilli population</json:string><json:string>flow deposit</json:string><json:string>overbank facies</json:string><json:string>distal deposits</json:string><json:string>largest diameter</json:string><json:string>large grains</json:string><json:string>matrix</json:string><json:string>vesicular</json:string><json:string>median</json:string><json:string>aggregate</json:string><json:string>fluid bridges</json:string><json:string>internal structure</json:string><json:string>tephra layers</json:string><json:string>internal characteristics</json:string><json:string>cumulative distribution curves show</json:string><json:string>internal structures</json:string><json:string>horizontal transport</json:string><json:string>discrete layers</json:string><json:string>vesiculated tuff</json:string><json:string>greater distances</json:string><json:string>april eruption</json:string><json:string>particle textures</json:string><json:string>tephra deposits</json:string><json:string>volcanol geotherm</json:string></teeft></keywords><author><json:item><name>Rolf Schumacher</name><affiliations><json:string>Mineralogisch-petrographisches Institut, Albert-Ludwigs Universität, Albertstrasse 23B, W-7800, Freiburg i. Br., Federal Republic of Germany</json:string></affiliations></json:item><json:item><name>Hans-Ulrich Schmincke</name><affiliations><json:string>GEOMAR, Wischhofstrasse 1-3, W-2300, Kiel 14, Federal Republic of Germany</json:string></affiliations></json:item></author><articleId><json:string>BF00493689</json:string><json:string>Art3</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>OriginalPaper</json:string></originalGenre><abstract>Abstract: Accretionary lapilli are common in fine-grained pyroclastic flow and surge deposits and related co-ignimbrite/co-surge ash layers of Laacher See volcano. Two morphologically different types are distin-guished: (1) Rim-type lapilli are composed of a coarse-grained core surrounded by a fine-grained rim. Rims are internally graded or made up of several layers of alternating fine and very-fine grained ash. (2) Core-type lapilli lack fine-grained rims. Field relationships, internal, and grain-size characteristics are specific to accretionary lapilli from different types of tephra deposits. Accretionary lapilli may therefore be a helpful tool to infer the origin of tephra of different origin. In co-ignimbrite ashfall, accretionary lapilli are generally concentrated at the base, whereas pyroclastic flow and surge deposits contain lapilli in the upper parts of individual, thin-bedded layers. Rim-type lapilli are found in pyroclastic flow and surge deposits up to 4 km from the source. Core-type lapilli occur at greater distances or are associated with vesiculated tuffs where they are within 1 km from the vent. Accretionary lapilli from co-ignimbrite/co-surge ash show open framework textures and edge-to-face contacts of individual ash particles. Vesicularity is generally low but the overall porosity of 40% to 50% results in an average density of 1200 kg/m3. Accretionary lapilli in pyroclastic flow and surge deposits are more densely packed and platy particles are often in face-to-face contacts. Vesicularity of those from pyroclastic flow deposits is significantly higher; the overall porosity is about 30% to 40% and the average density 1600 kg/m3. Grain-size analyses show that the accretionary lapilli in co-ignimbrite/co-surge ashfall deposits are the most fine-grained with a median (Md) of 20 to 30 μm and a maximum grain size of 250 to 350 μm. Accretionary lapilli from pyroclastic flow deposits have intermediate Md-values of 30 to 50 μm and a maximum grain size of 350 to 500 μm. Those of surge deposits are the coarsest grained with Md-values of 30 to >63 μm and a maximum grain size up to 2 mm.</abstract><qualityIndicators><score>8</score><pdfWordCount>12085</pdfWordCount><pdfCharCount>76586</pdfCharCount><pdfVersion>1.3</pdfVersion><pdfPageCount>23</pdfPageCount><pdfPageSize>597.28 x 785 pts</pdfPageSize><refBibsNative>false</refBibsNative><abstractWordCount>325</abstractWordCount><abstractCharCount>2130</abstractCharCount><keywordCount>0</keywordCount></qualityIndicators><title>Internal structure and occurrence of accretionary lapilli — a case study at Laacher See Volcano</title><genre><json:string>research-article</json:string></genre><host><title>Bulletin of Volcanology</title><language><json:string>unknown</json:string></language><publicationDate>1991</publicationDate><copyrightDate>1991</copyrightDate><issn><json:string>0258-8900</json:string></issn><eissn><json:string>1432-0819</json:string></eissn><journalId><json:string>445</json:string></journalId><volume>53</volume><issue>8</issue><pages><first>612</first><last>634</last></pages><genre><json:string>journal</json:string></genre><subject><json:item><value>Geology</value></json:item><json:item><value>Geophysics/Geodesy</value></json:item><json:item><value>Mineralogy</value></json:item><json:item><value>Sedimentology</value></json:item></subject></host><categories><wos><json:string>science</json:string><json:string>geosciences, multidisciplinary</json:string></wos><scienceMetrix><json:string>natural sciences</json:string><json:string>earth & environmental sciences</json:string><json:string>geochemistry & geophysics</json:string></scienceMetrix><inist><json:string>sciences appliquees, technologies et medecines</json:string><json:string>sciences exactes et technologie</json:string><json:string>terre, ocean, espace</json:string><json:string>sciences de la terre</json:string></inist></categories><publicationDate>1991</publicationDate><copyrightDate>1991</copyrightDate><doi><json:string>10.1007/BF00493689</json:string></doi><id>06F10A19476E0C694DE9296D6C7D1DA17079086D</id><score>1</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/06F10A19476E0C694DE9296D6C7D1DA17079086D/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/06F10A19476E0C694DE9296D6C7D1DA17079086D/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/06F10A19476E0C694DE9296D6C7D1DA17079086D/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a" type="main" xml:lang="en">Internal structure and occurrence of accretionary lapilli — a case study at Laacher See Volcano</title><respStmt><resp>Références bibliographiques récupérées via GROBID</resp><name resp="ISTEX-API">ISTEX-API (INIST-CNRS)</name></respStmt></titleStmt><publicationStmt><authority>ISTEX</authority><publisher scheme="https://publisher-list.data.istex.fr">Springer-Verlag</publisher><pubPlace>Berlin/Heidelberg</pubPlace><availability><licence><p>Springer-Verlag, 1991</p></licence><p scheme="https://loaded-corpus.data.istex.fr/ark:/67375/XBH-3XSW68JL-F">springer</p></availability><date>1991</date></publicationStmt><notesStmt><note type="research-article" scheme="https://content-type.data.istex.fr/ark:/67375/XTP-1JC4F85T-7">research-article</note><note type="journal" scheme="https://publication-type.data.istex.fr/ark:/67375/JMC-0GLKJH51-B">journal</note></notesStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">Internal structure and occurrence of accretionary lapilli — a case study at Laacher See Volcano</title><author xml:id="author-0000" corresp="yes"><persName><forename type="first">Rolf</forename><surname>Schumacher</surname></persName><affiliation>Mineralogisch-petrographisches Institut, Albert-Ludwigs Universität, Albertstrasse 23B, W-7800, Freiburg i. Br., Federal Republic of Germany</affiliation></author><author xml:id="author-0001"><persName><forename type="first">Hans-Ulrich</forename><surname>Schmincke</surname></persName><affiliation>GEOMAR, Wischhofstrasse 1-3, W-2300, Kiel 14, Federal Republic of Germany</affiliation></author><idno type="istex">06F10A19476E0C694DE9296D6C7D1DA17079086D</idno><idno type="ark">ark:/67375/1BB-69SR62K7-H</idno><idno type="DOI">10.1007/BF00493689</idno><idno type="article-id">BF00493689</idno><idno type="article-id">Art3</idno></analytic><monogr><title level="j">Bulletin of Volcanology</title><title level="j" type="abbrev">Bull Volcanol</title><idno type="pISSN">0258-8900</idno><idno type="eISSN">1432-0819</idno><idno type="journal-ID">true</idno><idno type="issue-article-count">7</idno><idno type="volume-issue-count">8</idno><imprint><publisher>Springer-Verlag</publisher><pubPlace>Berlin/Heidelberg</pubPlace><date type="published" when="1991-11-01"></date><biblScope unit="volume">53</biblScope><biblScope unit="issue">8</biblScope><biblScope unit="page" from="612">612</biblScope><biblScope unit="page" to="634">634</biblScope></imprint></monogr></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1991</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>Abstract: Accretionary lapilli are common in fine-grained pyroclastic flow and surge deposits and related co-ignimbrite/co-surge ash layers of Laacher See volcano. Two morphologically different types are distin-guished: (1) Rim-type lapilli are composed of a coarse-grained core surrounded by a fine-grained rim. Rims are internally graded or made up of several layers of alternating fine and very-fine grained ash. (2) Core-type lapilli lack fine-grained rims. Field relationships, internal, and grain-size characteristics are specific to accretionary lapilli from different types of tephra deposits. Accretionary lapilli may therefore be a helpful tool to infer the origin of tephra of different origin. In co-ignimbrite ashfall, accretionary lapilli are generally concentrated at the base, whereas pyroclastic flow and surge deposits contain lapilli in the upper parts of individual, thin-bedded layers. Rim-type lapilli are found in pyroclastic flow and surge deposits up to 4 km from the source. Core-type lapilli occur at greater distances or are associated with vesiculated tuffs where they are within 1 km from the vent. Accretionary lapilli from co-ignimbrite/co-surge ash show open framework textures and edge-to-face contacts of individual ash particles. Vesicularity is generally low but the overall porosity of 40% to 50% results in an average density of 1200 kg/m3. Accretionary lapilli in pyroclastic flow and surge deposits are more densely packed and platy particles are often in face-to-face contacts. Vesicularity of those from pyroclastic flow deposits is significantly higher; the overall porosity is about 30% to 40% and the average density 1600 kg/m3. Grain-size analyses show that the accretionary lapilli in co-ignimbrite/co-surge ashfall deposits are the most fine-grained with a median (Md) of 20 to 30 μm and a maximum grain size of 250 to 350 μm. Accretionary lapilli from pyroclastic flow deposits have intermediate Md-values of 30 to 50 μm and a maximum grain size of 350 to 500 μm. Those of surge deposits are the coarsest grained with Md-values of 30 to >63 μm and a maximum grain size up to 2 mm.</p></abstract><textClass><keywords scheme="Journal Subject"><list><head>Geosciences</head><item><term>Geology</term></item><item><term>Geophysics/Geodesy</term></item><item><term>Mineralogy</term></item><item><term>Sedimentology</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="1991-11-01">Published</change><change xml:id="refBibs-istex" who="#ISTEX-API" when="2017-10-4">References added</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/06F10A19476E0C694DE9296D6C7D1DA17079086D/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Springer, Publisher found" wicri:toSee="no header"><istex:xmlDeclaration>version="1.0" encoding="UTF-8"</istex:xmlDeclaration><istex:docType PUBLIC="-//Springer-Verlag//DTD A++ V2.4//EN" URI="http://devel.springer.de/A++/V2.4/DTD/A++V2.4.dtd" name="istex:docType"></istex:docType><istex:document><Publisher><PublisherInfo><PublisherName>Springer-Verlag</PublisherName><PublisherLocation>Berlin/Heidelberg</PublisherLocation></PublisherInfo><Journal><JournalInfo JournalProductType="ArchiveJournal" NumberingStyle="Unnumbered"><JournalID>445</JournalID><JournalPrintISSN>0258-8900</JournalPrintISSN><JournalElectronicISSN>1432-0819</JournalElectronicISSN><JournalTitle>Bulletin of Volcanology</JournalTitle><JournalAbbreviatedTitle>Bull Volcanol</JournalAbbreviatedTitle><JournalSubjectGroup><JournalSubject Type="Primary">Geosciences</JournalSubject><JournalSubject Type="Secondary">Geology</JournalSubject><JournalSubject Type="Secondary">Geophysics/Geodesy</JournalSubject><JournalSubject Type="Secondary">Mineralogy</JournalSubject><JournalSubject Type="Secondary">Sedimentology</JournalSubject></JournalSubjectGroup></JournalInfo><Volume><VolumeInfo VolumeType="Regular" TocLevels="0"><VolumeIDStart>53</VolumeIDStart><VolumeIDEnd>53</VolumeIDEnd><VolumeIssueCount>8</VolumeIssueCount></VolumeInfo><Issue IssueType="Regular"><IssueInfo TocLevels="0"><IssueIDStart>8</IssueIDStart><IssueIDEnd>8</IssueIDEnd><IssueArticleCount>7</IssueArticleCount><IssueHistory><CoverDate><Year>1991</Year><Month>11</Month></CoverDate></IssueHistory><IssueCopyright><CopyrightHolderName>Springer-Verlag</CopyrightHolderName><CopyrightYear>1991</CopyrightYear></IssueCopyright></IssueInfo><Article ID="Art3"><ArticleInfo Language="En" ArticleType="OriginalPaper" NumberingStyle="Unnumbered" TocLevels="0" ContainsESM="No"><ArticleID>BF00493689</ArticleID><ArticleDOI>10.1007/BF00493689</ArticleDOI><ArticleSequenceNumber>3</ArticleSequenceNumber><ArticleTitle Language="En">Internal structure and occurrence of accretionary lapilli — a case study at Laacher See Volcano</ArticleTitle><ArticleFirstPage>612</ArticleFirstPage><ArticleLastPage>634</ArticleLastPage><ArticleHistory><RegistrationDate><Year>2004</Year><Month>10</Month><Day>4</Day></RegistrationDate></ArticleHistory><ArticleEditorialResponsibility>Editorial responsibility: H. Sigurdsson</ArticleEditorialResponsibility><ArticleCopyright><CopyrightHolderName>Springer-Verlag</CopyrightHolderName><CopyrightYear>1991</CopyrightYear></ArticleCopyright><ArticleGrants Type="Regular"><MetadataGrant Grant="OpenAccess"></MetadataGrant><AbstractGrant Grant="OpenAccess"></AbstractGrant><BodyPDFGrant Grant="Restricted"></BodyPDFGrant><BodyHTMLGrant Grant="Restricted"></BodyHTMLGrant><BibliographyGrant Grant="Restricted"></BibliographyGrant><ESMGrant Grant="Restricted"></ESMGrant></ArticleGrants><ArticleContext><JournalID>445</JournalID><VolumeIDStart>53</VolumeIDStart><VolumeIDEnd>53</VolumeIDEnd><IssueIDStart>8</IssueIDStart><IssueIDEnd>8</IssueIDEnd></ArticleContext></ArticleInfo><ArticleHeader><AuthorGroup><Author AffiliationIDS="Aff1" CorrespondingAffiliationID="Aff1"><AuthorName DisplayOrder="Western"><GivenName>Rolf</GivenName><FamilyName>Schumacher</FamilyName></AuthorName></Author><Author AffiliationIDS="Aff2"><AuthorName DisplayOrder="Western"><GivenName>Hans-Ulrich</GivenName><FamilyName>Schmincke</FamilyName></AuthorName></Author><Affiliation ID="Aff1"><OrgDivision>Mineralogisch-petrographisches Institut</OrgDivision><OrgName>Albert-Ludwigs Universität</OrgName><OrgAddress><Street>Albertstrasse 23B</Street><Postcode>W-7800</Postcode><City>Freiburg i. Br.</City><Country>Federal Republic of Germany</Country></OrgAddress></Affiliation><Affiliation ID="Aff2"><OrgName>GEOMAR</OrgName><OrgAddress><Street>Wischhofstrasse 1-3</Street><Postcode>W-2300</Postcode><City>Kiel 14</City><Country>Federal Republic of Germany</Country></OrgAddress></Affiliation></AuthorGroup><Abstract ID="Abs1" Language="En"><Heading>Abstract</Heading><Para>Accretionary lapilli are common in fine-grained pyroclastic flow and surge deposits and related co-ignimbrite/co-surge ash layers of Laacher See volcano. Two morphologically different types are distin-guished: (1) Rim-type lapilli are composed of a coarse-grained core surrounded by a fine-grained rim. Rims are internally graded or made up of several layers of alternating fine and very-fine grained ash. (2) Core-type lapilli lack fine-grained rims. Field relationships, internal, and grain-size characteristics are specific to accretionary lapilli from different types of tephra deposits. Accretionary lapilli may therefore be a helpful tool to infer the origin of tephra of different origin. In co-ignimbrite ashfall, accretionary lapilli are generally concentrated at the base, whereas pyroclastic flow and surge deposits contain lapilli in the upper parts of individual, thin-bedded layers. Rim-type lapilli are found in pyroclastic flow and surge deposits up to 4 km from the source. Core-type lapilli occur at greater distances or are associated with vesiculated tuffs where they are within 1 km from the vent. Accretionary lapilli from co-ignimbrite/co-surge ash show open framework textures and edge-to-face contacts of individual ash particles. Vesicularity is generally low but the overall porosity of 40% to 50% results in an average density of 1200 kg/m<Superscript>3</Superscript>. Accretionary lapilli in pyroclastic flow and surge deposits are more densely packed and platy particles are often in face-to-face contacts. Vesicularity of those from pyroclastic flow deposits is significantly higher; the overall porosity is about 30% to 40% and the average density 1600 kg/m<Superscript>3</Superscript>. Grain-size analyses show that the accretionary lapilli in co-ignimbrite/co-surge ashfall deposits are the most fine-grained with a median (Md) of 20 to 30 μm and a maximum grain size of 250 to 350 μm. Accretionary lapilli from pyroclastic flow deposits have intermediate Md-values of 30 to 50 μm and a maximum grain size of 350 to 500 μm. Those of surge deposits are the coarsest grained with Md-values of 30 to >63 μm and a maximum grain size up to 2 mm.</Para></Abstract></ArticleHeader><NoBody></NoBody></Article></Issue></Volume></Journal></Publisher></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Internal structure and occurrence of accretionary lapilli — a case study at Laacher See Volcano</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Internal structure and occurrence of accretionary lapilli — a case study at Laacher See Volcano</title></titleInfo><name type="personal" displayLabel="corresp"><namePart type="given">Rolf</namePart><namePart type="family">Schumacher</namePart><affiliation>Mineralogisch-petrographisches Institut, Albert-Ludwigs Universität, Albertstrasse 23B, W-7800, Freiburg i. Br., Federal Republic of Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Hans-Ulrich</namePart><namePart type="family">Schmincke</namePart><affiliation>GEOMAR, Wischhofstrasse 1-3, W-2300, Kiel 14, Federal Republic of Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="OriginalPaper" authority="ISTEX" authorityURI="https://content-type.data.istex.fr" valueURI="https://content-type.data.istex.fr/ark:/67375/XTP-1JC4F85T-7">research-article</genre><originInfo><publisher>Springer-Verlag</publisher><place><placeTerm type="text">Berlin/Heidelberg</placeTerm></place><dateIssued encoding="w3cdtf">1991-11-01</dateIssued><dateIssued encoding="w3cdtf">1991</dateIssued><copyrightDate encoding="w3cdtf">1991</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><abstract lang="en">Abstract: Accretionary lapilli are common in fine-grained pyroclastic flow and surge deposits and related co-ignimbrite/co-surge ash layers of Laacher See volcano. Two morphologically different types are distin-guished: (1) Rim-type lapilli are composed of a coarse-grained core surrounded by a fine-grained rim. Rims are internally graded or made up of several layers of alternating fine and very-fine grained ash. (2) Core-type lapilli lack fine-grained rims. Field relationships, internal, and grain-size characteristics are specific to accretionary lapilli from different types of tephra deposits. Accretionary lapilli may therefore be a helpful tool to infer the origin of tephra of different origin. In co-ignimbrite ashfall, accretionary lapilli are generally concentrated at the base, whereas pyroclastic flow and surge deposits contain lapilli in the upper parts of individual, thin-bedded layers. Rim-type lapilli are found in pyroclastic flow and surge deposits up to 4 km from the source. Core-type lapilli occur at greater distances or are associated with vesiculated tuffs where they are within 1 km from the vent. Accretionary lapilli from co-ignimbrite/co-surge ash show open framework textures and edge-to-face contacts of individual ash particles. Vesicularity is generally low but the overall porosity of 40% to 50% results in an average density of 1200 kg/m3. Accretionary lapilli in pyroclastic flow and surge deposits are more densely packed and platy particles are often in face-to-face contacts. Vesicularity of those from pyroclastic flow deposits is significantly higher; the overall porosity is about 30% to 40% and the average density 1600 kg/m3. Grain-size analyses show that the accretionary lapilli in co-ignimbrite/co-surge ashfall deposits are the most fine-grained with a median (Md) of 20 to 30 μm and a maximum grain size of 250 to 350 μm. Accretionary lapilli from pyroclastic flow deposits have intermediate Md-values of 30 to 50 μm and a maximum grain size of 350 to 500 μm. Those of surge deposits are the coarsest grained with Md-values of 30 to >63 μm and a maximum grain size up to 2 mm.</abstract><relatedItem type="host"><titleInfo><title>Bulletin of Volcanology</title></titleInfo><titleInfo type="abbreviated"><title>Bull Volcanol</title></titleInfo><genre type="journal" displayLabel="Archive Journal" authority="ISTEX" valueURI="https://publication-type.data.istex.fr/ark:/67375/JMC-0GLKJH51-B">journal</genre><originInfo><publisher>Springer</publisher><dateIssued encoding="w3cdtf">1991-11-01</dateIssued><copyrightDate encoding="w3cdtf">1991</copyrightDate></originInfo><subject><genre>Geosciences</genre><topic>Geology</topic><topic>Geophysics/Geodesy</topic><topic>Mineralogy</topic><topic>Sedimentology</topic></subject><identifier type="ISSN">0258-8900</identifier><identifier type="eISSN">1432-0819</identifier><identifier type="JournalID">445</identifier><identifier type="IssueArticleCount">7</identifier><identifier type="VolumeIssueCount">8</identifier><part><date>1991</date><detail type="volume"><number>53</number><caption>vol.</caption></detail><detail type="issue"><number>8</number><caption>no.</caption></detail><extent unit="pages"><start>612</start><end>634</end></extent></part><recordInfo><recordOrigin>Springer-Verlag, 1991</recordOrigin></recordInfo></relatedItem><identifier type="istex">06F10A19476E0C694DE9296D6C7D1DA17079086D</identifier><identifier type="ark">ark:/67375/1BB-69SR62K7-H</identifier><identifier type="DOI">10.1007/BF00493689</identifier><identifier type="ArticleID">BF00493689</identifier><identifier type="ArticleID">Art3</identifier><accessCondition type="use and reproduction" contentType="copyright">Springer-Verlag, 1991</accessCondition><recordInfo><recordContentSource authority="ISTEX" authorityURI="https://loaded-corpus.data.istex.fr" valueURI="https://loaded-corpus.data.istex.fr/ark:/67375/XBH-3XSW68JL-F">springer</recordContentSource><recordOrigin>Springer-Verlag, 1991</recordOrigin></recordInfo></mods><json:item><extension>json</extension><original>false</original><mimetype>application/json</mimetype><uri>https://api.istex.fr/document/06F10A19476E0C694DE9296D6C7D1DA17079086D/metadata/json</uri></json:item></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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