Tectonics, magmatism, hydrothermalism and sets of flat joints locally filled by SnW aplite-pegmatite and quartz veins; southeastern border of the Serra de Estrela granitic massif (Beira Baixa, Portugal)
Identifieur interne : 000B25 ( Istex/Corpus ); précédent : 000B24; suivant : 000B26Tectonics, magmatism, hydrothermalism and sets of flat joints locally filled by SnW aplite-pegmatite and quartz veins; southeastern border of the Serra de Estrela granitic massif (Beira Baixa, Portugal)
Auteurs : C. Derre ; M. Lecolle ; G. Roger ; J. Tavares De Freitas CarvalhoSource :
- Ore Geology Reviews [ 0169-1368 ] ; 1986.
Abstract
Sets of flat joints controlling barren or SnW mineralized veins with aplite-pegmatite and/or quartz fillings form an interesting but difficult and controversial problem. In fact, at least three more-or-less independent parameters influence the formation of these vein-type deposits: (1) the creation of flat sets; (2) the origin of opening(s); and (3) their filling(s).Relatively few studies have been made of these domains and even if their authors did determine similar successions of events (i.e., creation, opening, and filling of the joints) they disagreed and even came to drastically contrary conclusions concerning the mode of the origin and the opening of flat joints.These different hypotheses are summarized and compared with our own results; the latter were obtained from observations of flat joint sets and of mineralized (or unmineralized) quartz and/or aplite-pegmatite veins occupying parts of these sets on the southern flank of the Serra de Estrêla, and by comparison with already known flat sets (locally with veins) of the Iberian Variscan belt.The following conclusions are drawn: 1.(1) Sets of flat joints are very common structures in the Iberian Variscan chain.2.(2) The sets are locally opened and filled by veins, either with or without mineralization (which is present only in close proximity of granitic intrusions, especially near late well-differentiated leucogranitic cupolas), elsewhere the joints remain closed and barren.3.(3) The genetic history of the flat joints is clearly independent of their opening(s) and filling(s); these joints originated long before the opening and infilling, the later having been two sub-synchronous or penecontemporaneous mechanisms, namely the consequence of shrinkage of the granites and hydraulic over-pressuring of different fluids. Clearly several genetic stages were involved.4.(4) The origin of flat joint systems can be related to shearing movements associated with weak to very weak tectonics which developed when the main structuration of the belt by the first syn-metamorphic phase of folding was already achieved and when the belt was partially uplifted and eroded.5.(5) The formation of the flat joints terminated just before the intrusion of the latest granites (Stephanian leucogranites) and thus before the injection of the residual magmatic liquids (aplites-pegmatites) or of hydrothermal SnW mineralizing fluids; in fact, some late biotitic leucogranites filled some scarcely opened joints.
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DOI: 10.1016/0169-1368(86)90004-1
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title>Tectonics, magmatism, hydrothermalism and sets of flat joints locally filled by SnW aplite-pegmatite and quartz veins; southeastern border of the Serra de Estrela granitic massif (Beira Baixa, Portugal)</title><author><name sortKey="Derre, C" sort="Derre, C" uniqKey="Derre C" first="C." last="Derre">C. Derre</name><affiliation><mods:affiliation>Unité Associée au CNRS No. 384 “Métallogénie et Pétrologie”, Laboratoire de Géologie Appliquée, Université P. et M. Curie, T. 26-00, 4 Place Jussieu, 75252 Paris Cédex 05 France</mods:affiliation></affiliation></author><author><name sortKey="Lecolle, M" sort="Lecolle, M" uniqKey="Lecolle M" first="M." last="Lecolle">M. Lecolle</name><affiliation><mods:affiliation>Unité Associée au CNRS No. 384 “Métallogénie et Pétrologie”, Laboratoire de Géologie Appliquée, Université P. et M. Curie, T. 26-00, 4 Place Jussieu, 75252 Paris Cédex 05 France</mods:affiliation></affiliation></author><author><name sortKey="Roger, G" sort="Roger, G" uniqKey="Roger G" first="G." last="Roger">G. Roger</name><affiliation><mods:affiliation>Unité Associée au CNRS No. 384 “Métallogénie et Pétrologie”, Laboratoire de Géologie Appliquée, Université P. et M. Curie, T. 26-00, 4 Place Jussieu, 75252 Paris Cédex 05 France</mods:affiliation></affiliation></author><author><name sortKey="Tavares De Freitas Carvalho, J" sort="Tavares De Freitas Carvalho, J" uniqKey="Tavares De Freitas Carvalho J" first="J." last="Tavares De Freitas Carvalho">J. Tavares De Freitas Carvalho</name><affiliation><mods:affiliation>Rua Central 1477, Vila Nova de Gaia (Lever), 4415 Carvalhos Portugal</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:CCDEDAF65604FC3DCEE7BA591FADE01F8F0EFBBA</idno><date when="1986" year="1986">1986</date><idno type="doi">10.1016/0169-1368(86)90004-1</idno><idno type="url">https://api.istex.fr/document/CCDEDAF65604FC3DCEE7BA591FADE01F8F0EFBBA/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">000B25</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">000B25</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a">Tectonics, magmatism, hydrothermalism and sets of flat joints locally filled by SnW aplite-pegmatite and quartz veins; southeastern border of the Serra de Estrela granitic massif (Beira Baixa, Portugal)</title><author><name sortKey="Derre, C" sort="Derre, C" uniqKey="Derre C" first="C." last="Derre">C. Derre</name><affiliation><mods:affiliation>Unité Associée au CNRS No. 384 “Métallogénie et Pétrologie”, Laboratoire de Géologie Appliquée, Université P. et M. Curie, T. 26-00, 4 Place Jussieu, 75252 Paris Cédex 05 France</mods:affiliation></affiliation></author><author><name sortKey="Lecolle, M" sort="Lecolle, M" uniqKey="Lecolle M" first="M." last="Lecolle">M. Lecolle</name><affiliation><mods:affiliation>Unité Associée au CNRS No. 384 “Métallogénie et Pétrologie”, Laboratoire de Géologie Appliquée, Université P. et M. Curie, T. 26-00, 4 Place Jussieu, 75252 Paris Cédex 05 France</mods:affiliation></affiliation></author><author><name sortKey="Roger, G" sort="Roger, G" uniqKey="Roger G" first="G." last="Roger">G. Roger</name><affiliation><mods:affiliation>Unité Associée au CNRS No. 384 “Métallogénie et Pétrologie”, Laboratoire de Géologie Appliquée, Université P. et M. Curie, T. 26-00, 4 Place Jussieu, 75252 Paris Cédex 05 France</mods:affiliation></affiliation></author><author><name sortKey="Tavares De Freitas Carvalho, J" sort="Tavares De Freitas Carvalho, J" uniqKey="Tavares De Freitas Carvalho J" first="J." last="Tavares De Freitas Carvalho">J. Tavares De Freitas Carvalho</name><affiliation><mods:affiliation>Rua Central 1477, Vila Nova de Gaia (Lever), 4415 Carvalhos Portugal</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Ore Geology Reviews</title><title level="j" type="abbrev">OREGEO</title><idno type="ISSN">0169-1368</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1986">1986</date><biblScope unit="volume">1</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="43">43</biblScope><biblScope unit="page" to="56">56</biblScope></imprint><idno type="ISSN">0169-1368</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0169-1368</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Sets of flat joints controlling barren or SnW mineralized veins with aplite-pegmatite and/or quartz fillings form an interesting but difficult and controversial problem. In fact, at least three more-or-less independent parameters influence the formation of these vein-type deposits: (1) the creation of flat sets; (2) the origin of opening(s); and (3) their filling(s).Relatively few studies have been made of these domains and even if their authors did determine similar successions of events (i.e., creation, opening, and filling of the joints) they disagreed and even came to drastically contrary conclusions concerning the mode of the origin and the opening of flat joints.These different hypotheses are summarized and compared with our own results; the latter were obtained from observations of flat joint sets and of mineralized (or unmineralized) quartz and/or aplite-pegmatite veins occupying parts of these sets on the southern flank of the Serra de Estrêla, and by comparison with already known flat sets (locally with veins) of the Iberian Variscan belt.The following conclusions are drawn: 1.(1) Sets of flat joints are very common structures in the Iberian Variscan chain.2.(2) The sets are locally opened and filled by veins, either with or without mineralization (which is present only in close proximity of granitic intrusions, especially near late well-differentiated leucogranitic cupolas), elsewhere the joints remain closed and barren.3.(3) The genetic history of the flat joints is clearly independent of their opening(s) and filling(s); these joints originated long before the opening and infilling, the later having been two sub-synchronous or penecontemporaneous mechanisms, namely the consequence of shrinkage of the granites and hydraulic over-pressuring of different fluids. Clearly several genetic stages were involved.4.(4) The origin of flat joint systems can be related to shearing movements associated with weak to very weak tectonics which developed when the main structuration of the belt by the first syn-metamorphic phase of folding was already achieved and when the belt was partially uplifted and eroded.5.(5) The formation of the flat joints terminated just before the intrusion of the latest granites (Stephanian leucogranites) and thus before the injection of the residual magmatic liquids (aplites-pegmatites) or of hydrothermal SnW mineralizing fluids; in fact, some late biotitic leucogranites filled some scarcely opened joints.</div></front></TEI><istex><corpusName>elsevier</corpusName><author><json:item><name>C. Derre</name><affiliations><json:string>Unité Associée au CNRS No. 384 “Métallogénie et Pétrologie”, Laboratoire de Géologie Appliquée, Université P. et M. Curie, T. 26-00, 4 Place Jussieu, 75252 Paris Cédex 05 France</json:string></affiliations></json:item><json:item><name>M. Lecolle</name><affiliations><json:string>Unité Associée au CNRS No. 384 “Métallogénie et Pétrologie”, Laboratoire de Géologie Appliquée, Université P. et M. Curie, T. 26-00, 4 Place Jussieu, 75252 Paris Cédex 05 France</json:string></affiliations></json:item><json:item><name>G. Roger</name><affiliations><json:string>Unité Associée au CNRS No. 384 “Métallogénie et Pétrologie”, Laboratoire de Géologie Appliquée, Université P. et M. Curie, T. 26-00, 4 Place Jussieu, 75252 Paris Cédex 05 France</json:string></affiliations></json:item><json:item><name>J. 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In fact, at least three more-or-less independent parameters influence the formation of these vein-type deposits: (1) the creation of flat sets; (2) the origin of opening(s); and (3) their filling(s).Relatively few studies have been made of these domains and even if their authors did determine similar successions of events (i.e., creation, opening, and filling of the joints) they disagreed and even came to drastically contrary conclusions concerning the mode of the origin and the opening of flat joints.These different hypotheses are summarized and compared with our own results; the latter were obtained from observations of flat joint sets and of mineralized (or unmineralized) quartz and/or aplite-pegmatite veins occupying parts of these sets on the southern flank of the Serra de Estrêla, and by comparison with already known flat sets (locally with veins) of the Iberian Variscan belt.The following conclusions are drawn: 1.(1) Sets of flat joints are very common structures in the Iberian Variscan chain.2.(2) The sets are locally opened and filled by veins, either with or without mineralization (which is present only in close proximity of granitic intrusions, especially near late well-differentiated leucogranitic cupolas), elsewhere the joints remain closed and barren.3.(3) The genetic history of the flat joints is clearly independent of their opening(s) and filling(s); these joints originated long before the opening and infilling, the later having been two sub-synchronous or penecontemporaneous mechanisms, namely the consequence of shrinkage of the granites and hydraulic over-pressuring of different fluids. Clearly several genetic stages were involved.4.(4) The origin of flat joint systems can be related to shearing movements associated with weak to very weak tectonics which developed when the main structuration of the belt by the first syn-metamorphic phase of folding was already achieved and when the belt was partially uplifted and eroded.5.(5) The formation of the flat joints terminated just before the intrusion of the latest granites (Stephanian leucogranites) and thus before the injection of the residual magmatic liquids (aplites-pegmatites) or of hydrothermal SnW mineralizing fluids; in fact, some late biotitic leucogranites filled some scarcely opened joints.</abstract><qualityIndicators><score>8.5</score><pdfVersion>1.4</pdfVersion><pdfPageSize>540 x 756 pts</pdfPageSize><refBibsNative>true</refBibsNative><keywordCount>0</keywordCount><abstractCharCount>2475</abstractCharCount><pdfWordCount>7623</pdfWordCount><pdfCharCount>37555</pdfCharCount><pdfPageCount>14</pdfPageCount><abstractWordCount>360</abstractWordCount></qualityIndicators><title>Tectonics, magmatism, hydrothermalism and sets of flat joints locally filled by SnW aplite-pegmatite and quartz veins; southeastern border of the Serra de Estrela granitic massif (Beira Baixa, Portugal)</title><pii><json:string>0169-1368(86)90004-1</json:string></pii><genre><json:string>research-article</json:string></genre><serie><language><json:string>unknown</json:string></language><title>Relatorio interno</title></serie><host><volume>1</volume><pii><json:string>S0169-1368(00)X0061-3</json:string></pii><pages><last>56</last><first>43</first></pages><issn><json:string>0169-1368</json:string></issn><issue>1</issue><genre><json:string>journal</json:string></genre><language><json:string>unknown</json:string></language><title>Ore Geology Reviews</title><publicationDate>1986</publicationDate></host><categories><wos><json:string>science</json:string><json:string>mining & mineral processing</json:string><json:string>mineralogy</json:string><json:string>geology</json:string></wos><scienceMetrix><json:string>natural sciences</json:string><json:string>earth & environmental sciences</json:string><json:string>geology</json:string></scienceMetrix><inist><json:string>sciences appliquees, technologies et medecines</json:string><json:string>sciences biologiques et medicales</json:string><json:string>sciences biologiques fondamentales et appliquees. psychologie</json:string></inist></categories><publicationDate>1986</publicationDate><copyrightDate>1986</copyrightDate><doi><json:string>10.1016/0169-1368(86)90004-1</json:string></doi><id>CCDEDAF65604FC3DCEE7BA591FADE01F8F0EFBBA</id><score>1</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/CCDEDAF65604FC3DCEE7BA591FADE01F8F0EFBBA/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/CCDEDAF65604FC3DCEE7BA591FADE01F8F0EFBBA/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/CCDEDAF65604FC3DCEE7BA591FADE01F8F0EFBBA/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a">Tectonics, magmatism, hydrothermalism and sets of flat joints locally filled by SnW aplite-pegmatite and quartz veins; southeastern border of the Serra de Estrela granitic massif (Beira Baixa, Portugal)</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>ELSEVIER</publisher><availability><p>ELSEVIER</p></availability><date>1986</date></publicationStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a">Tectonics, magmatism, hydrothermalism and sets of flat joints locally filled by SnW aplite-pegmatite and quartz veins; southeastern border of the Serra de Estrela granitic massif (Beira Baixa, Portugal)</title><author xml:id="author-0000"><persName><forename type="first">C.</forename><surname>Derre</surname></persName><affiliation>Unité Associée au CNRS No. 384 “Métallogénie et Pétrologie”, Laboratoire de Géologie Appliquée, Université P. et M. Curie, T. 26-00, 4 Place Jussieu, 75252 Paris Cédex 05 France</affiliation></author><author xml:id="author-0001"><persName><forename type="first">M.</forename><surname>Lecolle</surname></persName><affiliation>Unité Associée au CNRS No. 384 “Métallogénie et Pétrologie”, Laboratoire de Géologie Appliquée, Université P. et M. Curie, T. 26-00, 4 Place Jussieu, 75252 Paris Cédex 05 France</affiliation></author><author xml:id="author-0002"><persName><forename type="first">G.</forename><surname>Roger</surname></persName><affiliation>Unité Associée au CNRS No. 384 “Métallogénie et Pétrologie”, Laboratoire de Géologie Appliquée, Université P. et M. Curie, T. 26-00, 4 Place Jussieu, 75252 Paris Cédex 05 France</affiliation></author><author xml:id="author-0003"><persName><forename type="first">J.</forename><surname>Tavares de Freitas Carvalho</surname></persName><affiliation>Rua Central 1477, Vila Nova de Gaia (Lever), 4415 Carvalhos Portugal</affiliation></author><idno type="istex">CCDEDAF65604FC3DCEE7BA591FADE01F8F0EFBBA</idno><idno type="DOI">10.1016/0169-1368(86)90004-1</idno><idno type="PII">0169-1368(86)90004-1</idno></analytic><monogr><title level="j">Ore Geology Reviews</title><title level="j" type="abbrev">OREGEO</title><idno type="pISSN">0169-1368</idno><idno type="PII">S0169-1368(00)X0061-3</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1986"></date><biblScope unit="volume">1</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="43">43</biblScope><biblScope unit="page" to="56">56</biblScope></imprint></monogr></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1986</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>Sets of flat joints controlling barren or SnW mineralized veins with aplite-pegmatite and/or quartz fillings form an interesting but difficult and controversial problem. In fact, at least three more-or-less independent parameters influence the formation of these vein-type deposits: (1) the creation of flat sets; (2) the origin of opening(s); and (3) their filling(s).Relatively few studies have been made of these domains and even if their authors did determine similar successions of events (i.e., creation, opening, and filling of the joints) they disagreed and even came to drastically contrary conclusions concerning the mode of the origin and the opening of flat joints.These different hypotheses are summarized and compared with our own results; the latter were obtained from observations of flat joint sets and of mineralized (or unmineralized) quartz and/or aplite-pegmatite veins occupying parts of these sets on the southern flank of the Serra de Estrêla, and by comparison with already known flat sets (locally with veins) of the Iberian Variscan belt.The following conclusions are drawn: 1.(1) Sets of flat joints are very common structures in the Iberian Variscan chain.2.(2) The sets are locally opened and filled by veins, either with or without mineralization (which is present only in close proximity of granitic intrusions, especially near late well-differentiated leucogranitic cupolas), elsewhere the joints remain closed and barren.3.(3) The genetic history of the flat joints is clearly independent of their opening(s) and filling(s); these joints originated long before the opening and infilling, the later having been two sub-synchronous or penecontemporaneous mechanisms, namely the consequence of shrinkage of the granites and hydraulic over-pressuring of different fluids. Clearly several genetic stages were involved.4.(4) The origin of flat joint systems can be related to shearing movements associated with weak to very weak tectonics which developed when the main structuration of the belt by the first syn-metamorphic phase of folding was already achieved and when the belt was partially uplifted and eroded.5.(5) The formation of the flat joints terminated just before the intrusion of the latest granites (Stephanian leucogranites) and thus before the injection of the residual magmatic liquids (aplites-pegmatites) or of hydrothermal SnW mineralizing fluids; in fact, some late biotitic leucogranites filled some scarcely opened joints.</p></abstract></profileDesc><revisionDesc><change when="1986">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/CCDEDAF65604FC3DCEE7BA591FADE01F8F0EFBBA/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Elsevier, elements deleted: tail"><istex:xmlDeclaration>version="1.0" encoding="utf-8"</istex:xmlDeclaration><istex:docType PUBLIC="-//ES//DTD journal article DTD version 4.5.2//EN//XML" URI="art452.dtd" name="istex:docType"></istex:docType><istex:document><converted-article version="4.5.2" docsubtype="fla"><item-info><jid>OREGEO</jid><aid>86900041</aid><ce:pii>0169-1368(86)90004-1</ce:pii><ce:doi>10.1016/0169-1368(86)90004-1</ce:doi><ce:copyright type="unknown" year="1986"></ce:copyright></item-info><head><ce:title>Tectonics, magmatism, hydrothermalism and sets of flat joints locally filled by SnW aplite-pegmatite and quartz veins; southeastern border of the Serra de Estrela granitic massif (Beira Baixa, Portugal)</ce:title><ce:author-group><ce:author><ce:given-name>C.</ce:given-name><ce:surname>Derre</ce:surname><ce:cross-ref refid="AFF1"><ce:sup>1</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>M.</ce:given-name><ce:surname>Lecolle</ce:surname><ce:cross-ref refid="AFF1"><ce:sup>1</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>G.</ce:given-name><ce:surname>Roger</ce:surname><ce:cross-ref refid="AFF1"><ce:sup>1</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>J.</ce:given-name><ce:surname>Tavares de Freitas Carvalho</ce:surname><ce:cross-ref refid="AFF2"><ce:sup>2</ce:sup></ce:cross-ref></ce:author><ce:affiliation id="AFF1"><ce:label>1</ce:label><ce:textfn>Unité Associée au CNRS No. 384 “Métallogénie et Pétrologie”, Laboratoire de Géologie Appliquée, Université P. et M. Curie, T. 26-00, 4 Place Jussieu, 75252 Paris Cédex 05 France</ce:textfn></ce:affiliation><ce:affiliation id="AFF2"><ce:label>2</ce:label><ce:textfn>Rua Central 1477, Vila Nova de Gaia (Lever), 4415 Carvalhos Portugal</ce:textfn></ce:affiliation></ce:author-group><ce:date-accepted day="19" month="12" year="1985"></ce:date-accepted><ce:abstract><ce:section-title>Abstract</ce:section-title><ce:abstract-sec><ce:simple-para>Sets of flat joints controlling barren or SnW mineralized veins with aplite-pegmatite and/or quartz fillings form an interesting but difficult and controversial problem. In fact, at least three more-or-less independent parameters influence the formation of these vein-type deposits: (1) the creation of flat sets; (2) the origin of opening(s); and (3) their filling(s).</ce:simple-para><ce:simple-para>Relatively few studies have been made of these domains and even if their authors did determine similar successions of events (i.e., creation, opening, and filling of the joints) they disagreed and even came to drastically contrary conclusions concerning the mode of the origin and the opening of flat joints.</ce:simple-para><ce:simple-para>These different hypotheses are summarized and compared with our own results; the latter were obtained from observations of flat joint sets and of mineralized (or unmineralized) quartz and/or aplite-pegmatite veins occupying parts of these sets on the southern flank of the Serra de Estrêla, and by comparison with already known flat sets (locally with veins) of the Iberian Variscan belt.</ce:simple-para><ce:simple-para>The following conclusions are drawn: <ce:list><ce:list-item><ce:label>1.</ce:label><ce:para>(1) Sets of flat joints are very common structures in the Iberian Variscan chain.</ce:para></ce:list-item><ce:list-item><ce:label>2.</ce:label><ce:para>(2) The sets are locally opened and filled by veins, either with or without mineralization (which is present only in close proximity of granitic intrusions, especially near late well-differentiated leucogranitic cupolas), elsewhere the joints remain closed and barren.</ce:para></ce:list-item><ce:list-item><ce:label>3.</ce:label><ce:para>(3) The genetic history of the flat joints is clearly independent of their opening(s) and filling(s); these joints originated long before the opening and infilling, the later having been two sub-synchronous or penecontemporaneous mechanisms, namely the consequence of shrinkage of the granites and hydraulic over-pressuring of different fluids. Clearly several genetic stages were involved.</ce:para></ce:list-item><ce:list-item><ce:label>4.</ce:label><ce:para>(4) The origin of flat joint systems can be related to shearing movements associated with weak to very weak tectonics which developed when the main structuration of the belt by the first syn-metamorphic phase of folding was already achieved and when the belt was partially uplifted and eroded.</ce:para></ce:list-item><ce:list-item><ce:label>5.</ce:label><ce:para>(5) The formation of the flat joints terminated just before the intrusion of the latest granites (Stephanian leucogranites) and thus before the injection of the residual magmatic liquids (aplites-pegmatites) or of hydrothermal SnW mineralizing fluids; in fact, some late biotitic leucogranites filled some scarcely opened joints.</ce:para></ce:list-item></ce:list></ce:simple-para></ce:abstract-sec></ce:abstract></head></converted-article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo><title>Tectonics, magmatism, hydrothermalism and sets of flat joints locally filled by SnW aplite-pegmatite and quartz veins; southeastern border of the Serra de Estrela granitic massif (Beira Baixa, Portugal)</title></titleInfo><titleInfo type="alternative" contentType="CDATA"><title>Tectonics, magmatism, hydrothermalism and sets of flat joints locally filled by SnW aplite-pegmatite and quartz veins; southeastern border of the Serra de Estrela granitic massif (Beira Baixa, Portugal)</title></titleInfo><name type="personal"><namePart type="given">C.</namePart><namePart type="family">Derre</namePart><affiliation>Unité Associée au CNRS No. 384 “Métallogénie et Pétrologie”, Laboratoire de Géologie Appliquée, Université P. et M. Curie, T. 26-00, 4 Place Jussieu, 75252 Paris Cédex 05 France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">M.</namePart><namePart type="family">Lecolle</namePart><affiliation>Unité Associée au CNRS No. 384 “Métallogénie et Pétrologie”, Laboratoire de Géologie Appliquée, Université P. et M. Curie, T. 26-00, 4 Place Jussieu, 75252 Paris Cédex 05 France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">G.</namePart><namePart type="family">Roger</namePart><affiliation>Unité Associée au CNRS No. 384 “Métallogénie et Pétrologie”, Laboratoire de Géologie Appliquée, Université P. et M. Curie, T. 26-00, 4 Place Jussieu, 75252 Paris Cédex 05 France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J.</namePart><namePart type="family">Tavares de Freitas Carvalho</namePart><affiliation>Rua Central 1477, Vila Nova de Gaia (Lever), 4415 Carvalhos Portugal</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="Full-length article"></genre><originInfo><publisher>ELSEVIER</publisher><dateIssued encoding="w3cdtf">1986</dateIssued><copyrightDate encoding="w3cdtf">1986</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">Sets of flat joints controlling barren or SnW mineralized veins with aplite-pegmatite and/or quartz fillings form an interesting but difficult and controversial problem. In fact, at least three more-or-less independent parameters influence the formation of these vein-type deposits: (1) the creation of flat sets; (2) the origin of opening(s); and (3) their filling(s).Relatively few studies have been made of these domains and even if their authors did determine similar successions of events (i.e., creation, opening, and filling of the joints) they disagreed and even came to drastically contrary conclusions concerning the mode of the origin and the opening of flat joints.These different hypotheses are summarized and compared with our own results; the latter were obtained from observations of flat joint sets and of mineralized (or unmineralized) quartz and/or aplite-pegmatite veins occupying parts of these sets on the southern flank of the Serra de Estrêla, and by comparison with already known flat sets (locally with veins) of the Iberian Variscan belt.The following conclusions are drawn: 1.(1) Sets of flat joints are very common structures in the Iberian Variscan chain.2.(2) The sets are locally opened and filled by veins, either with or without mineralization (which is present only in close proximity of granitic intrusions, especially near late well-differentiated leucogranitic cupolas), elsewhere the joints remain closed and barren.3.(3) The genetic history of the flat joints is clearly independent of their opening(s) and filling(s); these joints originated long before the opening and infilling, the later having been two sub-synchronous or penecontemporaneous mechanisms, namely the consequence of shrinkage of the granites and hydraulic over-pressuring of different fluids. Clearly several genetic stages were involved.4.(4) The origin of flat joint systems can be related to shearing movements associated with weak to very weak tectonics which developed when the main structuration of the belt by the first syn-metamorphic phase of folding was already achieved and when the belt was partially uplifted and eroded.5.(5) The formation of the flat joints terminated just before the intrusion of the latest granites (Stephanian leucogranites) and thus before the injection of the residual magmatic liquids (aplites-pegmatites) or of hydrothermal SnW mineralizing fluids; in fact, some late biotitic leucogranites filled some scarcely opened joints.</abstract><relatedItem type="host"><titleInfo><title>Ore Geology Reviews</title></titleInfo><titleInfo type="abbreviated"><title>OREGEO</title></titleInfo><genre type="journal">journal</genre><originInfo><dateIssued encoding="w3cdtf">198605</dateIssued></originInfo><identifier type="ISSN">0169-1368</identifier><identifier type="PII">S0169-1368(00)X0061-3</identifier><part><date>198605</date><detail type="volume"><number>1</number><caption>vol.</caption></detail><detail type="issue"><number>1</number><caption>no.</caption></detail><extent unit="issue pages"><start>1</start><end>146</end></extent><extent unit="pages"><start>43</start><end>56</end></extent></part></relatedItem><identifier type="istex">CCDEDAF65604FC3DCEE7BA591FADE01F8F0EFBBA</identifier><identifier type="DOI">10.1016/0169-1368(86)90004-1</identifier><identifier type="PII">0169-1368(86)90004-1</identifier><recordInfo><recordContentSource>ELSEVIER</recordContentSource></recordInfo></mods></metadata></istex></record>Pour manipuler ce document sous Unix (Dilib)
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