Mineralogy and geochemistry of El Dorado epithermal gold deposit, El Sauce district, central-northern Chile
Summary The El Dorado Au-Cu deposit is located in an extensive intra-caldera zone of hydrothermal alteration affecting Upper Cretaceous andesites of the Los Elquinos Formation at La Serena (≈ 29°47′S Lat., 70°43′W Long., Chile). Quartz-sulfide veins of economic potential are hosted by N25W and N20E...
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| Veröffentlicht in: | Mineralogy and petrology 2008-03, Vol.92 (3-4), p.341-360 |
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| creator | Carrillo-Rosúa, J. Morales-Ruano, S. Morata, D. Boyce, A. J. Belmar, M. Fallick, A. E. Fenoll Hach-Alí, P. |
| description | Summary
The El Dorado Au-Cu deposit is located in an extensive intra-caldera zone of hydrothermal alteration affecting Upper Cretaceous andesites of the
Los Elquinos Formation
at La Serena (≈ 29°47′S Lat., 70°43′W Long., Chile). Quartz-sulfide veins of economic potential are hosted by N25W and N20E fault structures associated with quartz-illite alteration (+supergene kaolinite). The main ore minerals in the deposit are pyrite, chalcopyrite ± fahlore (As/(As + Sb): 0.06−0.98), with electrum, sphalerite, galena, bournonite-seligmanite (As/(As + Sb): 0.21−0.31), marcasite, pyrrhotite being accessory phases. Electrum, with an Ag content between 32 and 37 at.%, occurs interstitial to pyrite aggregates or along pyrite fractures. Pyrite commonly exhibits chemical zonation with some zones up to 1.96 at.% As. Electron probe microanalyses of pyrite indicate that As-rich zones do not exhibit detectable Au values. Fluid inclusion microthermometry shows homogenization temperatures between 130 and 352 °C and salinities between 1.6 and 6.9 wt.% NaCl eq. Isotope data for quartz, ankerite and phyllosilicates and estimated temperatures show that δ
18
O and δD for the hydrothermal fluids were between 3 and 10‰ and between −95 and −75‰, respectively. These results suggest the mineralizing fluids were a mixture of meteoric and magmatic waters. An epithermal intermediate-sulfidation model is proposed for the formation of the El Dorado deposit. |
| doi_str_mv | 10.1007/s00710-007-0203-7 |
| format | Article |
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The El Dorado Au-Cu deposit is located in an extensive intra-caldera zone of hydrothermal alteration affecting Upper Cretaceous andesites of the
Los Elquinos Formation
at La Serena (≈ 29°47′S Lat., 70°43′W Long., Chile). Quartz-sulfide veins of economic potential are hosted by N25W and N20E fault structures associated with quartz-illite alteration (+supergene kaolinite). The main ore minerals in the deposit are pyrite, chalcopyrite ± fahlore (As/(As + Sb): 0.06−0.98), with electrum, sphalerite, galena, bournonite-seligmanite (As/(As + Sb): 0.21−0.31), marcasite, pyrrhotite being accessory phases. Electrum, with an Ag content between 32 and 37 at.%, occurs interstitial to pyrite aggregates or along pyrite fractures. Pyrite commonly exhibits chemical zonation with some zones up to 1.96 at.% As. Electron probe microanalyses of pyrite indicate that As-rich zones do not exhibit detectable Au values. Fluid inclusion microthermometry shows homogenization temperatures between 130 and 352 °C and salinities between 1.6 and 6.9 wt.% NaCl eq. Isotope data for quartz, ankerite and phyllosilicates and estimated temperatures show that δ
18
O and δD for the hydrothermal fluids were between 3 and 10‰ and between −95 and −75‰, respectively. These results suggest the mineralizing fluids were a mixture of meteoric and magmatic waters. An epithermal intermediate-sulfidation model is proposed for the formation of the El Dorado deposit.</description><identifier>ISSN: 0930-0708</identifier><identifier>EISSN: 1438-1168</identifier><identifier>DOI: 10.1007/s00710-007-0203-7</identifier><language>eng</language><publisher>Vienna: Springer-Verlag</publisher><subject>Calderas ; Cretaceous ; Earth and Environmental Science ; Earth Sciences ; Geochemistry ; Geology ; Gold ; Illite ; Inorganic Chemistry ; Kaolinite ; Mineralogy ; Petrology ; Pyrite ; Quartz ; Sodium chloride ; Zonation</subject><ispartof>Mineralogy and petrology, 2008-03, Vol.92 (3-4), p.341-360</ispartof><rights>Springer-Verlag 2007</rights><rights>Springer-Verlag 2008</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a338t-34338cd0519f4cd9f9b7374fe21f96b67cae9f65514d3806824f1d6c8f6c3ea03</citedby><cites>FETCH-LOGICAL-a338t-34338cd0519f4cd9f9b7374fe21f96b67cae9f65514d3806824f1d6c8f6c3ea03</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s00710-007-0203-7$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s00710-007-0203-7$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,27923,27924,41487,42556,51318</link.rule.ids></links><search><creatorcontrib>Carrillo-Rosúa, J.</creatorcontrib><creatorcontrib>Morales-Ruano, S.</creatorcontrib><creatorcontrib>Morata, D.</creatorcontrib><creatorcontrib>Boyce, A. J.</creatorcontrib><creatorcontrib>Belmar, M.</creatorcontrib><creatorcontrib>Fallick, A. E.</creatorcontrib><creatorcontrib>Fenoll Hach-Alí, P.</creatorcontrib><title>Mineralogy and geochemistry of El Dorado epithermal gold deposit, El Sauce district, central-northern Chile</title><title>Mineralogy and petrology</title><addtitle>Miner Petrol</addtitle><description>Summary
The El Dorado Au-Cu deposit is located in an extensive intra-caldera zone of hydrothermal alteration affecting Upper Cretaceous andesites of the
Los Elquinos Formation
at La Serena (≈ 29°47′S Lat., 70°43′W Long., Chile). Quartz-sulfide veins of economic potential are hosted by N25W and N20E fault structures associated with quartz-illite alteration (+supergene kaolinite). The main ore minerals in the deposit are pyrite, chalcopyrite ± fahlore (As/(As + Sb): 0.06−0.98), with electrum, sphalerite, galena, bournonite-seligmanite (As/(As + Sb): 0.21−0.31), marcasite, pyrrhotite being accessory phases. Electrum, with an Ag content between 32 and 37 at.%, occurs interstitial to pyrite aggregates or along pyrite fractures. Pyrite commonly exhibits chemical zonation with some zones up to 1.96 at.% As. Electron probe microanalyses of pyrite indicate that As-rich zones do not exhibit detectable Au values. Fluid inclusion microthermometry shows homogenization temperatures between 130 and 352 °C and salinities between 1.6 and 6.9 wt.% NaCl eq. Isotope data for quartz, ankerite and phyllosilicates and estimated temperatures show that δ
18
O and δD for the hydrothermal fluids were between 3 and 10‰ and between −95 and −75‰, respectively. These results suggest the mineralizing fluids were a mixture of meteoric and magmatic waters. An epithermal intermediate-sulfidation model is proposed for the formation of the El Dorado deposit.</description><subject>Calderas</subject><subject>Cretaceous</subject><subject>Earth and Environmental Science</subject><subject>Earth Sciences</subject><subject>Geochemistry</subject><subject>Geology</subject><subject>Gold</subject><subject>Illite</subject><subject>Inorganic Chemistry</subject><subject>Kaolinite</subject><subject>Mineralogy</subject><subject>Petrology</subject><subject>Pyrite</subject><subject>Quartz</subject><subject>Sodium chloride</subject><subject>Zonation</subject><issn>0930-0708</issn><issn>1438-1168</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><sourceid>8G5</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNp1kE9PwzAMxSMEEmPwAbhFnCk4TdukRzT-SkMcgHOUJU7X0TUl6Q779qQaEicutmW_37P0CLlkcMMAxG1MhUGWagY58EwckRkruMwYq-QxmUHN01WAPCVnMW4AQJaSzcjXa9tj0J1v9lT3ljbozRq3bRzDnnpHHzp674O2nuLQjmsMW93RxneWWhx8bMfrSfKudwapnajWpJXBfkymWe_DxPR0sW47PCcnTncRL377nHw-PnwsnrPl29PL4m6Zac7lmPEiNWOhZLUrjK1dvRJcFA5z5upqVQmjsXZVWbLCcgmVzAvHbGWkqwxHDXxOrg6-Q_DfO4yj2vhd6NNLlecsBwlCJhE7iEzwMQZ0agjtVoe9YqCmSNUhUjWNU6RKJCY_MDFp-wbDn_H_0A9dw3le</recordid><startdate>20080301</startdate><enddate>20080301</enddate><creator>Carrillo-Rosúa, J.</creator><creator>Morales-Ruano, S.</creator><creator>Morata, D.</creator><creator>Boyce, A. J.</creator><creator>Belmar, M.</creator><creator>Fallick, A. E.</creator><creator>Fenoll Hach-Alí, P.</creator><general>Springer-Verlag</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7XB</scope><scope>88I</scope><scope>8BQ</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>8FK</scope><scope>8G5</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>ATCPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>F1W</scope><scope>FR3</scope><scope>GNUQQ</scope><scope>GUQSH</scope><scope>H96</scope><scope>HCIFZ</scope><scope>JG9</scope><scope>KB.</scope><scope>KR7</scope><scope>L.G</scope><scope>L6V</scope><scope>M2O</scope><scope>M2P</scope><scope>M7S</scope><scope>MBDVC</scope><scope>PATMY</scope><scope>PCBAR</scope><scope>PDBOC</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PTHSS</scope><scope>PYCSY</scope><scope>Q9U</scope></search><sort><creationdate>20080301</creationdate><title>Mineralogy and geochemistry of El Dorado epithermal gold deposit, El Sauce district, central-northern Chile</title><author>Carrillo-Rosúa, J. ; Morales-Ruano, S. ; Morata, D. ; Boyce, A. J. ; Belmar, M. ; Fallick, A. E. ; Fenoll Hach-Alí, P.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a338t-34338cd0519f4cd9f9b7374fe21f96b67cae9f65514d3806824f1d6c8f6c3ea03</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2008</creationdate><topic>Calderas</topic><topic>Cretaceous</topic><topic>Earth and Environmental Science</topic><topic>Earth Sciences</topic><topic>Geochemistry</topic><topic>Geology</topic><topic>Gold</topic><topic>Illite</topic><topic>Inorganic Chemistry</topic><topic>Kaolinite</topic><topic>Mineralogy</topic><topic>Petrology</topic><topic>Pyrite</topic><topic>Quartz</topic><topic>Sodium chloride</topic><topic>Zonation</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Carrillo-Rosúa, J.</creatorcontrib><creatorcontrib>Morales-Ruano, S.</creatorcontrib><creatorcontrib>Morata, D.</creatorcontrib><creatorcontrib>Boyce, A. J.</creatorcontrib><creatorcontrib>Belmar, M.</creatorcontrib><creatorcontrib>Fallick, A. 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J.</au><au>Belmar, M.</au><au>Fallick, A. E.</au><au>Fenoll Hach-Alí, P.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Mineralogy and geochemistry of El Dorado epithermal gold deposit, El Sauce district, central-northern Chile</atitle><jtitle>Mineralogy and petrology</jtitle><stitle>Miner Petrol</stitle><date>2008-03-01</date><risdate>2008</risdate><volume>92</volume><issue>3-4</issue><spage>341</spage><epage>360</epage><pages>341-360</pages><issn>0930-0708</issn><eissn>1438-1168</eissn><abstract>Summary
The El Dorado Au-Cu deposit is located in an extensive intra-caldera zone of hydrothermal alteration affecting Upper Cretaceous andesites of the
Los Elquinos Formation
at La Serena (≈ 29°47′S Lat., 70°43′W Long., Chile). Quartz-sulfide veins of economic potential are hosted by N25W and N20E fault structures associated with quartz-illite alteration (+supergene kaolinite). The main ore minerals in the deposit are pyrite, chalcopyrite ± fahlore (As/(As + Sb): 0.06−0.98), with electrum, sphalerite, galena, bournonite-seligmanite (As/(As + Sb): 0.21−0.31), marcasite, pyrrhotite being accessory phases. Electrum, with an Ag content between 32 and 37 at.%, occurs interstitial to pyrite aggregates or along pyrite fractures. Pyrite commonly exhibits chemical zonation with some zones up to 1.96 at.% As. Electron probe microanalyses of pyrite indicate that As-rich zones do not exhibit detectable Au values. Fluid inclusion microthermometry shows homogenization temperatures between 130 and 352 °C and salinities between 1.6 and 6.9 wt.% NaCl eq. Isotope data for quartz, ankerite and phyllosilicates and estimated temperatures show that δ
18
O and δD for the hydrothermal fluids were between 3 and 10‰ and between −95 and −75‰, respectively. These results suggest the mineralizing fluids were a mixture of meteoric and magmatic waters. An epithermal intermediate-sulfidation model is proposed for the formation of the El Dorado deposit.</abstract><cop>Vienna</cop><pub>Springer-Verlag</pub><doi>10.1007/s00710-007-0203-7</doi><tpages>20</tpages></addata></record> |
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| subjects | Calderas Cretaceous Earth and Environmental Science Earth Sciences Geochemistry Geology Gold Illite Inorganic Chemistry Kaolinite Mineralogy Petrology Pyrite Quartz Sodium chloride Zonation |
| title | Mineralogy and geochemistry of El Dorado epithermal gold deposit, El Sauce district, central-northern Chile |
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