Carbon-oxygen isotopic covariations of calcite from Langdu skarn copper deposit, China： implications for sulfide precipitation
The Langdu skarn copper deposit in the Zhongdian area, Yunnan Province, China, has an average Cu grade of 6.49 %. The deposit is related to a porphyry intrusion （- 216 Ma）, which was emplaced in the Upper Triassic sedimentary rocks of the Tumugou and Qugasi Formations. At the Langdu skarn copper dep...
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| description | The Langdu skarn copper deposit in the Zhongdian area, Yunnan Province, China, has an average Cu grade of 6.49 %. The deposit is related to a porphyry intrusion （- 216 Ma）, which was emplaced in the Upper Triassic sedimentary rocks of the Tumugou and Qugasi Formations. At the Langdu skarn copper deposit, carbon and oxygen isotope ratios of fresh limestones （δ^18O= 3.0-5.6 ‰ relative to V-SMOW; δ13C = 24.5-25.7 ‰ relative to PDB） and partly altered limestones （δ18O = 27-7.2 to -1.9‰; δ13C = 11.8-15.2 ‰） indicated that the deposit was a typ- ical marine carbonate source. Oxygen and carbon isotope values for calcites formed at different hydrothermal stages are -9.1 to 0.2 and 10.1-16.3 ‰, respectively. Moreover, the carbon-oxygen isotopic composition of an ore-forming fluid （δ13O = 5.0-9.5‰, δ13C = -7.3 to -5.3‰） suggested the presence of magmatic water, which most likely came from the differentiation or melting of a homologous magma chamber. The deposition of Calcite I may arise from metasomatism in an open system with a progressively decreasing temperature. Later, the minerals chalcopyrite, pyrrhotite, quartz and Calcite II were precipitated due to immiscibility. Water-rock interaction could potentially be responsible for Calcite III precipitation in the post-ore stage. |
| doi_str_mv | 10.1007/s11631-014-0014-6 |
| format | Article |
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The deposit is related to a porphyry intrusion （- 216 Ma）, which was emplaced in the Upper Triassic sedimentary rocks of the Tumugou and Qugasi Formations. At the Langdu skarn copper deposit, carbon and oxygen isotope ratios of fresh limestones （δ^18O= 3.0-5.6 ‰ relative to V-SMOW; δ13C = 24.5-25.7 ‰ relative to PDB） and partly altered limestones （δ18O = 27-7.2 to -1.9‰; δ13C = 11.8-15.2 ‰） indicated that the deposit was a typ- ical marine carbonate source. Oxygen and carbon isotope values for calcites formed at different hydrothermal stages are -9.1 to 0.2 and 10.1-16.3 ‰, respectively. Moreover, the carbon-oxygen isotopic composition of an ore-forming fluid （δ13O = 5.0-9.5‰, δ13C = -7.3 to -5.3‰） suggested the presence of magmatic water, which most likely came from the differentiation or melting of a homologous magma chamber. The deposition of Calcite I may arise from metasomatism in an open system with a progressively decreasing temperature. Later, the minerals chalcopyrite, pyrrhotite, quartz and Calcite II were precipitated due to immiscibility. Water-rock interaction could potentially be responsible for Calcite III precipitation in the post-ore stage.</description><identifier>ISSN: 1000-9426</identifier><identifier>ISSN: 2096-0956</identifier><identifier>EISSN: 1993-0364</identifier><identifier>EISSN: 2365-7499</identifier><identifier>DOI: 10.1007/s11631-014-0014-6</identifier><language>eng</language><publisher>Heidelberg: Science Press</publisher><subject>Calcite ; Carbon ; Carbon isotopes ; CHALCOPYRITE ; China ; Copper ; COPPER RESOURCES ; Deposits ; Earth and Environmental Science ; Earth Sciences ; Geochemistry ; Immiscibility ; ISOTOPES ; Limestone ; Magmatic water ; MINERAL DEPOSITS ; Original Article ; OXYGEN ; Oxygen isotopes ; PORPHYRY ORES ; Precipitation ; Sedimentary rocks ; SULFIDES ; Triassic ; 中国 ; 夕卡岩型 ; 氧同位素比率 ; 沉淀 ; 海相碳酸盐 ; 热液方解石 ; 硫化物 ; 铜矿床</subject><ispartof>Acta geochimica, 2015-03, Vol.34 (1), p.21-27</ispartof><rights>Science Press, Institute of Geochemistry, CAS and Springer-Verlag Berlin Heidelberg 2014</rights><rights>Science Press, Institute of Geochemistry, CAS and Springer-Verlag Berlin Heidelberg 2015</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a535t-c9005894194c9f115a0da94b52e447fb28933ddc2ece004ddc9cf6006994c65d3</citedby><cites>FETCH-LOGICAL-a535t-c9005894194c9f115a0da94b52e447fb28933ddc2ece004ddc9cf6006994c65d3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Uhttp://image.cqvip.com/vip1000/qk/85079X/85079X.jpg</thumbnail><link.rule.ids>315,781,785,27928,27929</link.rule.ids></links><search><creatorcontrib>Ren, Tao</creatorcontrib><creatorcontrib>Zhang, Xingchun</creatorcontrib><creatorcontrib>Han, Runsheng</creatorcontrib><creatorcontrib>Hou, Baohong</creatorcontrib><title>Carbon-oxygen isotopic covariations of calcite from Langdu skarn copper deposit, China： implications for sulfide precipitation</title><title>Acta geochimica</title><addtitle>Chin. J. Geochem</addtitle><addtitle>Chinese Journal of Geochemistry</addtitle><description>The Langdu skarn copper deposit in the Zhongdian area, Yunnan Province, China, has an average Cu grade of 6.49 %. The deposit is related to a porphyry intrusion （- 216 Ma）, which was emplaced in the Upper Triassic sedimentary rocks of the Tumugou and Qugasi Formations. At the Langdu skarn copper deposit, carbon and oxygen isotope ratios of fresh limestones （δ^18O= 3.0-5.6 ‰ relative to V-SMOW; δ13C = 24.5-25.7 ‰ relative to PDB） and partly altered limestones （δ18O = 27-7.2 to -1.9‰; δ13C = 11.8-15.2 ‰） indicated that the deposit was a typ- ical marine carbonate source. Oxygen and carbon isotope values for calcites formed at different hydrothermal stages are -9.1 to 0.2 and 10.1-16.3 ‰, respectively. Moreover, the carbon-oxygen isotopic composition of an ore-forming fluid （δ13O = 5.0-9.5‰, δ13C = -7.3 to -5.3‰） suggested the presence of magmatic water, which most likely came from the differentiation or melting of a homologous magma chamber. The deposition of Calcite I may arise from metasomatism in an open system with a progressively decreasing temperature. Later, the minerals chalcopyrite, pyrrhotite, quartz and Calcite II were precipitated due to immiscibility. Water-rock interaction could potentially be responsible for Calcite III precipitation in the post-ore stage.</description><subject>Calcite</subject><subject>Carbon</subject><subject>Carbon isotopes</subject><subject>CHALCOPYRITE</subject><subject>China</subject><subject>Copper</subject><subject>COPPER RESOURCES</subject><subject>Deposits</subject><subject>Earth and Environmental Science</subject><subject>Earth Sciences</subject><subject>Geochemistry</subject><subject>Immiscibility</subject><subject>ISOTOPES</subject><subject>Limestone</subject><subject>Magmatic water</subject><subject>MINERAL DEPOSITS</subject><subject>Original Article</subject><subject>OXYGEN</subject><subject>Oxygen isotopes</subject><subject>PORPHYRY ORES</subject><subject>Precipitation</subject><subject>Sedimentary rocks</subject><subject>SULFIDES</subject><subject>Triassic</subject><subject>中国</subject><subject>夕卡岩型</subject><subject>氧同位素比率</subject><subject>沉淀</subject><subject>海相碳酸盐</subject><subject>热液方解石</subject><subject>硫化物</subject><subject>铜矿床</subject><issn>1000-9426</issn><issn>2096-0956</issn><issn>1993-0364</issn><issn>2365-7499</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNp9kUtOHDEURUsRSOG3gMysZJJBCp6_hYdRiwSklpjA2HK77Mak2jZ2VUTPWAdrYU9sIe50K4oYMLGf5HPus3Sb5hOGUwzQnRWMBcUtYNbC5hAfmgMsJW2BCrZXZwBoJSPiY3NYyj0AobTrDpqnmc6LGNr4uF7agHyJY0zeIBN_6-z16GMoKDpk9GD8aJHLcYXmOiz7CZVfOodKpmQz6m2KxY_f0OzOB_368oz8Kg3e7CJczKhMg_O9RSlb45Mf_z4dN_tOD8We7O6j5vbHxc3ssp1f_7yafZ-3mlM-tkYC8HPJsGRGOoy5hl5LtuDEMta5BTmXlPa9IdZYAFYnaZwAELIKgvf0qPm6zU05Pky2jGrli7HDoIONU1FYdJ2kwCSv6Jc36H2ccqi_qxTnUjDJaKXwljI5lpKtUyn7lc5rhUFtOlHbTlStQ206UaI6ZOuUyoalzf8lvyN93i26i2H5UL1_m4RghEgmCP0DqUqdCg</recordid><startdate>20150301</startdate><enddate>20150301</enddate><creator>Ren, Tao</creator><creator>Zhang, Xingchun</creator><creator>Han, Runsheng</creator><creator>Hou, Baohong</creator><general>Science Press</general><general>Springer Nature B.V</general><scope>2RA</scope><scope>92L</scope><scope>CQIGP</scope><scope>W94</scope><scope>~WA</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7UA</scope><scope>7XB</scope><scope>88I</scope><scope>8BQ</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>8FK</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>F1W</scope><scope>FR3</scope><scope>GNUQQ</scope><scope>H96</scope><scope>HCIFZ</scope><scope>JG9</scope><scope>KB.</scope><scope>KR7</scope><scope>L.G</scope><scope>L6V</scope><scope>M2P</scope><scope>M7S</scope><scope>PCBAR</scope><scope>PDBOC</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PTHSS</scope><scope>Q9U</scope><scope>H8G</scope></search><sort><creationdate>20150301</creationdate><title>Carbon-oxygen isotopic covariations of calcite from Langdu skarn copper deposit, China： implications for sulfide precipitation</title><author>Ren, Tao ; 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J. Geochem</stitle><addtitle>Chinese Journal of Geochemistry</addtitle><date>2015-03-01</date><risdate>2015</risdate><volume>34</volume><issue>1</issue><spage>21</spage><epage>27</epage><pages>21-27</pages><issn>1000-9426</issn><issn>2096-0956</issn><eissn>1993-0364</eissn><eissn>2365-7499</eissn><abstract>The Langdu skarn copper deposit in the Zhongdian area, Yunnan Province, China, has an average Cu grade of 6.49 %. The deposit is related to a porphyry intrusion （- 216 Ma）, which was emplaced in the Upper Triassic sedimentary rocks of the Tumugou and Qugasi Formations. At the Langdu skarn copper deposit, carbon and oxygen isotope ratios of fresh limestones （δ^18O= 3.0-5.6 ‰ relative to V-SMOW; δ13C = 24.5-25.7 ‰ relative to PDB） and partly altered limestones （δ18O = 27-7.2 to -1.9‰; δ13C = 11.8-15.2 ‰） indicated that the deposit was a typ- ical marine carbonate source. Oxygen and carbon isotope values for calcites formed at different hydrothermal stages are -9.1 to 0.2 and 10.1-16.3 ‰, respectively. Moreover, the carbon-oxygen isotopic composition of an ore-forming fluid （δ13O = 5.0-9.5‰, δ13C = -7.3 to -5.3‰） suggested the presence of magmatic water, which most likely came from the differentiation or melting of a homologous magma chamber. The deposition of Calcite I may arise from metasomatism in an open system with a progressively decreasing temperature. Later, the minerals chalcopyrite, pyrrhotite, quartz and Calcite II were precipitated due to immiscibility. Water-rock interaction could potentially be responsible for Calcite III precipitation in the post-ore stage.</abstract><cop>Heidelberg</cop><pub>Science Press</pub><doi>10.1007/s11631-014-0014-6</doi><tpages>7</tpages></addata></record> |
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| subjects | Calcite Carbon Carbon isotopes CHALCOPYRITE China Copper COPPER RESOURCES Deposits Earth and Environmental Science Earth Sciences Geochemistry Immiscibility ISOTOPES Limestone Magmatic water MINERAL DEPOSITS Original Article OXYGEN Oxygen isotopes PORPHYRY ORES Precipitation Sedimentary rocks SULFIDES Triassic 中国 夕卡岩型 氧同位素比率 沉淀 海相碳酸盐 热液方解石 硫化物 铜矿床 |
| title | Carbon-oxygen isotopic covariations of calcite from Langdu skarn copper deposit, China： implications for sulfide precipitation |
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