Physiochemical Restrictions of Mineral Zoning of Sediment-Hosted Stratiform Copper Deposit in SW China
The Chuxiong basin, located in southwest China, is well known as a mineralization area of red-bed type copper deposits in China. These deposits are characterized by mineral zoning, which is especially true for the Dayao deposits. The mineral zoning is consistent for both horizontal and vertical zoni...
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Wiley
2018-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2018/4261795 |
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| author | Yan Zhang Runsheng Han Shuming Wen Pingtang Wei |
| author_facet | Yan Zhang Runsheng Han Shuming Wen Pingtang Wei |
| author_sort | Yan Zhang |
| collection | DOAJ |
| description | The Chuxiong basin, located in southwest China, is well known as a mineralization area of red-bed type copper deposits in China. These deposits are characterized by mineral zoning, which is especially true for the Dayao deposits. The mineral zoning is consistent for both horizontal and vertical zoning; from the base (center) of the ore body to the top (outermost), the mineral zones are from hematite, chalcocite, chalcocite + bornite, and bornite + chalcopyrite to pyrite. We studied the mineral zoning in detail using a thermodynamic phase diagram method, such as logfO2-logfS2, pH-logfO2, and pH-Eh, and discussed the constraints on the order of the minerals precipitation under different physiochemical conditions. It is indicated that changes in temperature have little effect on pH and Eh in the formation of minerals. S2− is stable only below 473 K, and the forming temperature of chalcocite must be below 473 K. In this paper, we also explain the mineral zoning formation mechanism and propose that the main controlling factor of mineral zoning is pH. Because this mineral zoning is widespread in sediment-hosted deposits, studies on this mechanism can considerably promote better understanding of the genesis of ore deposits in order to guide the exploration. |
| format | Article |
| id | doaj-art-3c8b3d47973d44e399cd976c389f4820 |
| institution | Kabale University |
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| language | English |
| publishDate | 2018-01-01 |
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| series | Geofluids |
| spelling | doaj-art-3c8b3d47973d44e399cd976c389f48202025-02-03T01:12:02ZengWileyGeofluids1468-81151468-81232018-01-01201810.1155/2018/42617954261795Physiochemical Restrictions of Mineral Zoning of Sediment-Hosted Stratiform Copper Deposit in SW ChinaYan Zhang0Runsheng Han1Shuming Wen2Pingtang Wei3Southwest Institute of Geological Survey, Geological Survey Center for Non-Ferrous Mineral Resources, Kunming University of Science and Technology, Kunming 650093, ChinaSouthwest Institute of Geological Survey, Geological Survey Center for Non-Ferrous Mineral Resources, Kunming University of Science and Technology, Kunming 650093, ChinaState Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, ChinaKunming Geological Prospecting Institute, China Metallurgical Geological Bureau, Kunming, Yunnan 650024, ChinaThe Chuxiong basin, located in southwest China, is well known as a mineralization area of red-bed type copper deposits in China. These deposits are characterized by mineral zoning, which is especially true for the Dayao deposits. The mineral zoning is consistent for both horizontal and vertical zoning; from the base (center) of the ore body to the top (outermost), the mineral zones are from hematite, chalcocite, chalcocite + bornite, and bornite + chalcopyrite to pyrite. We studied the mineral zoning in detail using a thermodynamic phase diagram method, such as logfO2-logfS2, pH-logfO2, and pH-Eh, and discussed the constraints on the order of the minerals precipitation under different physiochemical conditions. It is indicated that changes in temperature have little effect on pH and Eh in the formation of minerals. S2− is stable only below 473 K, and the forming temperature of chalcocite must be below 473 K. In this paper, we also explain the mineral zoning formation mechanism and propose that the main controlling factor of mineral zoning is pH. Because this mineral zoning is widespread in sediment-hosted deposits, studies on this mechanism can considerably promote better understanding of the genesis of ore deposits in order to guide the exploration.http://dx.doi.org/10.1155/2018/4261795 |
| spellingShingle | Yan Zhang Runsheng Han Shuming Wen Pingtang Wei Physiochemical Restrictions of Mineral Zoning of Sediment-Hosted Stratiform Copper Deposit in SW China Geofluids |
| title | Physiochemical Restrictions of Mineral Zoning of Sediment-Hosted Stratiform Copper Deposit in SW China |
| title_full | Physiochemical Restrictions of Mineral Zoning of Sediment-Hosted Stratiform Copper Deposit in SW China |
| title_fullStr | Physiochemical Restrictions of Mineral Zoning of Sediment-Hosted Stratiform Copper Deposit in SW China |
| title_full_unstemmed | Physiochemical Restrictions of Mineral Zoning of Sediment-Hosted Stratiform Copper Deposit in SW China |
| title_short | Physiochemical Restrictions of Mineral Zoning of Sediment-Hosted Stratiform Copper Deposit in SW China |
| title_sort | physiochemical restrictions of mineral zoning of sediment hosted stratiform copper deposit in sw china |
| url | http://dx.doi.org/10.1155/2018/4261795 |
| work_keys_str_mv | AT yanzhang physiochemicalrestrictionsofmineralzoningofsedimenthostedstratiformcopperdepositinswchina AT runshenghan physiochemicalrestrictionsofmineralzoningofsedimenthostedstratiformcopperdepositinswchina AT shumingwen physiochemicalrestrictionsofmineralzoningofsedimenthostedstratiformcopperdepositinswchina AT pingtangwei physiochemicalrestrictionsofmineralzoningofsedimenthostedstratiformcopperdepositinswchina |