A study of scale deposition: An analogue of meso- to epithermal ore formation in the volcano of Milos, Aegean arc, Greece
Identifieur interne : 000338 ( Main/Exploration ); précédent : 000337; suivant : 000339A study of scale deposition: An analogue of meso- to epithermal ore formation in the volcano of Milos, Aegean arc, Greece
Auteurs : Kimon Christanis [Grèce] ; Karen St. Seymour [Grèce, Canada]Source :
- Geothermics [ 0375-6505 ] ; 1995.
English descriptors
- KwdEn :
- Aqueous sulphide solutions, Base metals, Brine, Brine line, Chemical composition, Chloride complexes, Christanis, Concordia university, Crystalline phases, Deposition, Dominant sulphide, Econ, Economic geologists, Economic geology, Epithermal, Epithermal deposits, Epithermal systems, Flow regime, Fytikas, Geol, Geothermal, Geothermal framework, Geothermal system, Geothermal systems, Geothermoelectric unit, Henley, Hydrothermal, Hydrothermal flow, Hydrothermal fluid, Hydrothermal systems, Hydrovolcanic breccias, Karabelas, Lamella, Liakopoulos, Many investigators, Milo, Milos island, Milos scales, Milos volcano, Phase separation, Plumbing system, Precious metals, Public power corporation, Pyroclastic rocks, Residence time, Sampling location, Scale deposition, Scale formation, Solubility calculations, Sulphide, Sulphide complexing, Triades deposit, Upper parts, Volcanic, Volcanic rock, Volcanic rocks.
- Teeft :
- Aqueous sulphide solutions, Base metals, Brine, Brine line, Chemical composition, Chloride complexes, Christanis, Concordia university, Crystalline phases, Deposition, Dominant sulphide, Econ, Economic geologists, Economic geology, Epithermal, Epithermal deposits, Epithermal systems, Flow regime, Fytikas, Geol, Geothermal, Geothermal framework, Geothermal system, Geothermal systems, Geothermoelectric unit, Henley, Hydrothermal, Hydrothermal flow, Hydrothermal fluid, Hydrothermal systems, Hydrovolcanic breccias, Karabelas, Lamella, Liakopoulos, Many investigators, Milo, Milos island, Milos scales, Milos volcano, Phase separation, Plumbing system, Precious metals, Public power corporation, Pyroclastic rocks, Residence time, Sampling location, Scale deposition, Scale formation, Solubility calculations, Sulphide, Sulphide complexing, Triades deposit, Upper parts, Volcanic, Volcanic rock, Volcanic rocks.
Abstract
Abstract: The viability of boiling as a mechanism for meso- to epithermal ore formation has been tested in the Milos volcano, Aegean Island Arc, by investigating rates of deposition and composition of scale, and by drawing an analogy between the results and actual field occurrences on the island. Milos offers ideal conditions for such testing: it consists of predominantly felsic volcanic rocks with numerous late-stage hydrovolcanic (phreatic) breccias. A geothermal system is at present active in the area, with numerous terrestrial and submarine hot spring outlets and kaoline and bentonite alteration zones. AuAg bearing polymetallic, as well as manganese and barite ore deposits, occur on the island; scaling tests were made possible after the installation of a 2 MW geothermoelectric plant on Milos. The rates of scale deposition were measured during different test times and analyses made on the chemistry and mineralogy of scales from the Milos plant; the results indicate that the rates of scale deposition are higher near the flashing valve, and that the metals Pb, Cu, Zn are deposited as sulphides in the vicinity of the flashing point, particularly PbS, which has the lowest solubility and, to a lesser degree, Cu-sulphide. ZnS is the dominant sulphide downstream. Higher scaling rates are observed in tests which are suspect of a higher incidence of two-phase flow in the pipe. Pressure, temperature and salinity conditions of the hydrothermal fluid are conducive to phase separation in the upper parts of the Milos geothermal system and down to a depth of 1000–1100 m but, as scaling tests indicate, self-sealing of the system could rapidly halt hydrothermal flow and ore formation; however, hydrovolcanic (phreatic) explosions may initiate new cycles of ore-deposition. The metals have mainly precipitated as sulphides, except for Fe, which is found mostly in the siliceous matrix of the scale. The paragenesis of the metals in the Milos scales is similar to those of AuAg bearing polymetallic deposits on the island. Domains with signs of multiple episodes and craters of hydraulic fracturing, argillic alteration, siliceous sinters and gossaneous cappings, should be targeted on Milos for exploration for meso- to epithermal polymetallic and precious metal ores.
Url:
DOI: 10.1016/0375-6505(95)00006-C
Affiliations:
Links toward previous steps (curation, corpus...)
- to stream Istex, to step Corpus: 000475
- to stream Istex, to step Curation: 000475
- to stream Istex, to step Checkpoint: 000274
- to stream Main, to step Merge: 000345
- to stream Main, to step Curation: 000338
Le document en format XML
<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title>A study of scale deposition: An analogue of meso- to epithermal ore formation in the volcano of Milos, Aegean arc, Greece</title>
<author><name sortKey="Christanis, Kimon" sort="Christanis, Kimon" uniqKey="Christanis K" first="Kimon" last="Christanis">Kimon Christanis</name>
</author>
<author><name sortKey="Seymour, Karen St" sort="Seymour, Karen St" uniqKey="Seymour K" first="Karen St." last="Seymour">Karen St. Seymour</name>
</author>
</titleStmt>
<publicationStmt><idno type="wicri:source">ISTEX</idno>
<idno type="RBID">ISTEX:19BBFC4D89618676AB71355EAB1CEDC79FA83727</idno>
<date when="1995" year="1995">1995</date>
<idno type="doi">10.1016/0375-6505(95)00006-C</idno>
<idno type="url">https://api.istex.fr/document/19BBFC4D89618676AB71355EAB1CEDC79FA83727/fulltext/pdf</idno>
<idno type="wicri:Area/Istex/Corpus">000475</idno>
<idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">000475</idno>
<idno type="wicri:Area/Istex/Curation">000475</idno>
<idno type="wicri:Area/Istex/Checkpoint">000274</idno>
<idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Checkpoint">000274</idno>
<idno type="wicri:doubleKey">0375-6505:1995:Christanis K:a:study:of</idno>
<idno type="wicri:Area/Main/Merge">000345</idno>
<idno type="wicri:Area/Main/Curation">000338</idno>
<idno type="wicri:Area/Main/Exploration">000338</idno>
</publicationStmt>
<sourceDesc><biblStruct><analytic><title level="a">A study of scale deposition: An analogue of meso- to epithermal ore formation in the volcano of Milos, Aegean arc, Greece</title>
<author><name sortKey="Christanis, Kimon" sort="Christanis, Kimon" uniqKey="Christanis K" first="Kimon" last="Christanis">Kimon Christanis</name>
<affiliation wicri:level="1"><country xml:lang="fr">Grèce</country>
<wicri:regionArea>Department of Geology, University of Patras, Rion</wicri:regionArea>
<wicri:noRegion>Rion</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Seymour, Karen St" sort="Seymour, Karen St" uniqKey="Seymour K" first="Karen St." last="Seymour">Karen St. Seymour</name>
<affiliation wicri:level="1"><country xml:lang="fr">Grèce</country>
<wicri:regionArea>Department of Geology, University of Patras, Rion</wicri:regionArea>
<wicri:noRegion>Rion</wicri:noRegion>
</affiliation>
<affiliation wicri:level="3"><country xml:lang="fr">Canada</country>
<wicri:regionArea>Department of Geology, Concordia University, Montreal</wicri:regionArea>
<placeName><settlement type="city">Montréal</settlement>
<region type="state">Québec</region>
</placeName>
</affiliation>
</author>
</analytic>
<monogr></monogr>
<series><title level="j">Geothermics</title>
<title level="j" type="abbrev">GEOT</title>
<idno type="ISSN">0375-6505</idno>
<imprint><publisher>ELSEVIER</publisher>
<date type="published" when="1995">1995</date>
<biblScope unit="volume">24</biblScope>
<biblScope unit="issue">4</biblScope>
<biblScope unit="page" from="541">541</biblScope>
<biblScope unit="page" to="552">552</biblScope>
</imprint>
<idno type="ISSN">0375-6505</idno>
</series>
</biblStruct>
</sourceDesc>
<seriesStmt><idno type="ISSN">0375-6505</idno>
</seriesStmt>
</fileDesc>
<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Aqueous sulphide solutions</term>
<term>Base metals</term>
<term>Brine</term>
<term>Brine line</term>
<term>Chemical composition</term>
<term>Chloride complexes</term>
<term>Christanis</term>
<term>Concordia university</term>
<term>Crystalline phases</term>
<term>Deposition</term>
<term>Dominant sulphide</term>
<term>Econ</term>
<term>Economic geologists</term>
<term>Economic geology</term>
<term>Epithermal</term>
<term>Epithermal deposits</term>
<term>Epithermal systems</term>
<term>Flow regime</term>
<term>Fytikas</term>
<term>Geol</term>
<term>Geothermal</term>
<term>Geothermal framework</term>
<term>Geothermal system</term>
<term>Geothermal systems</term>
<term>Geothermoelectric unit</term>
<term>Henley</term>
<term>Hydrothermal</term>
<term>Hydrothermal flow</term>
<term>Hydrothermal fluid</term>
<term>Hydrothermal systems</term>
<term>Hydrovolcanic breccias</term>
<term>Karabelas</term>
<term>Lamella</term>
<term>Liakopoulos</term>
<term>Many investigators</term>
<term>Milo</term>
<term>Milos island</term>
<term>Milos scales</term>
<term>Milos volcano</term>
<term>Phase separation</term>
<term>Plumbing system</term>
<term>Precious metals</term>
<term>Public power corporation</term>
<term>Pyroclastic rocks</term>
<term>Residence time</term>
<term>Sampling location</term>
<term>Scale deposition</term>
<term>Scale formation</term>
<term>Solubility calculations</term>
<term>Sulphide</term>
<term>Sulphide complexing</term>
<term>Triades deposit</term>
<term>Upper parts</term>
<term>Volcanic</term>
<term>Volcanic rock</term>
<term>Volcanic rocks</term>
</keywords>
<keywords scheme="Teeft" xml:lang="en"><term>Aqueous sulphide solutions</term>
<term>Base metals</term>
<term>Brine</term>
<term>Brine line</term>
<term>Chemical composition</term>
<term>Chloride complexes</term>
<term>Christanis</term>
<term>Concordia university</term>
<term>Crystalline phases</term>
<term>Deposition</term>
<term>Dominant sulphide</term>
<term>Econ</term>
<term>Economic geologists</term>
<term>Economic geology</term>
<term>Epithermal</term>
<term>Epithermal deposits</term>
<term>Epithermal systems</term>
<term>Flow regime</term>
<term>Fytikas</term>
<term>Geol</term>
<term>Geothermal</term>
<term>Geothermal framework</term>
<term>Geothermal system</term>
<term>Geothermal systems</term>
<term>Geothermoelectric unit</term>
<term>Henley</term>
<term>Hydrothermal</term>
<term>Hydrothermal flow</term>
<term>Hydrothermal fluid</term>
<term>Hydrothermal systems</term>
<term>Hydrovolcanic breccias</term>
<term>Karabelas</term>
<term>Lamella</term>
<term>Liakopoulos</term>
<term>Many investigators</term>
<term>Milo</term>
<term>Milos island</term>
<term>Milos scales</term>
<term>Milos volcano</term>
<term>Phase separation</term>
<term>Plumbing system</term>
<term>Precious metals</term>
<term>Public power corporation</term>
<term>Pyroclastic rocks</term>
<term>Residence time</term>
<term>Sampling location</term>
<term>Scale deposition</term>
<term>Scale formation</term>
<term>Solubility calculations</term>
<term>Sulphide</term>
<term>Sulphide complexing</term>
<term>Triades deposit</term>
<term>Upper parts</term>
<term>Volcanic</term>
<term>Volcanic rock</term>
<term>Volcanic rocks</term>
</keywords>
</textClass>
<langUsage><language ident="en">en</language>
</langUsage>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">Abstract: The viability of boiling as a mechanism for meso- to epithermal ore formation has been tested in the Milos volcano, Aegean Island Arc, by investigating rates of deposition and composition of scale, and by drawing an analogy between the results and actual field occurrences on the island. Milos offers ideal conditions for such testing: it consists of predominantly felsic volcanic rocks with numerous late-stage hydrovolcanic (phreatic) breccias. A geothermal system is at present active in the area, with numerous terrestrial and submarine hot spring outlets and kaoline and bentonite alteration zones. AuAg bearing polymetallic, as well as manganese and barite ore deposits, occur on the island; scaling tests were made possible after the installation of a 2 MW geothermoelectric plant on Milos. The rates of scale deposition were measured during different test times and analyses made on the chemistry and mineralogy of scales from the Milos plant; the results indicate that the rates of scale deposition are higher near the flashing valve, and that the metals Pb, Cu, Zn are deposited as sulphides in the vicinity of the flashing point, particularly PbS, which has the lowest solubility and, to a lesser degree, Cu-sulphide. ZnS is the dominant sulphide downstream. Higher scaling rates are observed in tests which are suspect of a higher incidence of two-phase flow in the pipe. Pressure, temperature and salinity conditions of the hydrothermal fluid are conducive to phase separation in the upper parts of the Milos geothermal system and down to a depth of 1000–1100 m but, as scaling tests indicate, self-sealing of the system could rapidly halt hydrothermal flow and ore formation; however, hydrovolcanic (phreatic) explosions may initiate new cycles of ore-deposition. The metals have mainly precipitated as sulphides, except for Fe, which is found mostly in the siliceous matrix of the scale. The paragenesis of the metals in the Milos scales is similar to those of AuAg bearing polymetallic deposits on the island. Domains with signs of multiple episodes and craters of hydraulic fracturing, argillic alteration, siliceous sinters and gossaneous cappings, should be targeted on Milos for exploration for meso- to epithermal polymetallic and precious metal ores.</div>
</front>
</TEI>
<affiliations><list><country><li>Canada</li>
<li>Grèce</li>
</country>
<region><li>Québec</li>
</region>
<settlement><li>Montréal</li>
</settlement>
</list>
<tree><country name="Grèce"><noRegion><name sortKey="Christanis, Kimon" sort="Christanis, Kimon" uniqKey="Christanis K" first="Kimon" last="Christanis">Kimon Christanis</name>
</noRegion>
<name sortKey="Seymour, Karen St" sort="Seymour, Karen St" uniqKey="Seymour K" first="Karen St." last="Seymour">Karen St. Seymour</name>
</country>
<country name="Canada"><region name="Québec"><name sortKey="Seymour, Karen St" sort="Seymour, Karen St" uniqKey="Seymour K" first="Karen St." last="Seymour">Karen St. Seymour</name>
</region>
</country>
</tree>
</affiliations>
</record>
Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=$WICRI_ROOT/Wicri/Terre/explor/NissirosV1/Data/Main/Exploration
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 000338 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd -nk 000338 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien |wiki= Wicri/Terre |area= NissirosV1 |flux= Main |étape= Exploration |type= RBID |clé= ISTEX:19BBFC4D89618676AB71355EAB1CEDC79FA83727 |texte= A study of scale deposition: An analogue of meso- to epithermal ore formation in the volcano of Milos, Aegean arc, Greece }}
![]() | This area was generated with Dilib version V0.6.33. | ![]() |