The Au-Hosting Minerals and Process of Formation of the Carlin-Type Bojitian Deposit, Southwestern China
The recently discovered middle-sized Bojitian Carlin-type Au deposit is located in southwestern Guizhou Province, China, near the well-known Shuiyindong super-large-sized deposit. To improve the understanding on this deposit, here we investigate the minerals that host Au and the occurrence of Au in...
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| Language: | English |
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Wiley
2017-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2017/2417209 |
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| author | Kai Hu Moucheng Pan Jian Cao Yin Liu Shanchu Han |
| author_facet | Kai Hu Moucheng Pan Jian Cao Yin Liu Shanchu Han |
| author_sort | Kai Hu |
| collection | DOAJ |
| description | The recently discovered middle-sized Bojitian Carlin-type Au deposit is located in southwestern Guizhou Province, China, near the well-known Shuiyindong super-large-sized deposit. To improve the understanding on this deposit, here we investigate the minerals that host Au and the occurrence of Au in the deposit, using a combination of microscopic work and electron probe microanalysis (EPMA). Based on the results, the formation of the deposit was addressed. Results indicate that the dominant minerals that host Au include arsenian pyrite and arsenopyrite. Au in the cores of zoned pyrite exists mainly as natural nanoscale Au (Au0), while Au in the rims exists mainly as solid solution Au (Au+), but it likely also exists in the rims as natural nanoscale Au. The framboidal, coarse-grained, and banded pyrite types contain both natural nanoscale Au0 and solid solution Au+. The arsenopyrite is of hydrothermal origin, and Au within the arsenopyrite exists as gold solution Au+. The Bojitian deposit was formed from As-bearing, H2S-rich, low-to-medium-temperature fluids that migrated along faults and other channels. Au that was already present in the strata or source beds migrated with the fluids in the form of Au(HS)− and ore-forming fluids were then formed in the reducing environment. The ore-forming fluids interacted with Fe-rich carbonates to form an abundance of Au-hosting arsenian sulfides. |
| format | Article |
| id | doaj-art-93b2efd13edd4a90a1041bd9a1cb3d27 |
| institution | Kabale University |
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| language | English |
| publishDate | 2017-01-01 |
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| series | Geofluids |
| spelling | doaj-art-93b2efd13edd4a90a1041bd9a1cb3d272025-08-20T03:37:20ZengWileyGeofluids1468-81151468-81232017-01-01201710.1155/2017/24172092417209The Au-Hosting Minerals and Process of Formation of the Carlin-Type Bojitian Deposit, Southwestern ChinaKai Hu0Moucheng Pan1Jian Cao2Yin Liu3Shanchu Han4State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, ChinaState Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, ChinaState Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, ChinaState Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, ChinaState Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, ChinaThe recently discovered middle-sized Bojitian Carlin-type Au deposit is located in southwestern Guizhou Province, China, near the well-known Shuiyindong super-large-sized deposit. To improve the understanding on this deposit, here we investigate the minerals that host Au and the occurrence of Au in the deposit, using a combination of microscopic work and electron probe microanalysis (EPMA). Based on the results, the formation of the deposit was addressed. Results indicate that the dominant minerals that host Au include arsenian pyrite and arsenopyrite. Au in the cores of zoned pyrite exists mainly as natural nanoscale Au (Au0), while Au in the rims exists mainly as solid solution Au (Au+), but it likely also exists in the rims as natural nanoscale Au. The framboidal, coarse-grained, and banded pyrite types contain both natural nanoscale Au0 and solid solution Au+. The arsenopyrite is of hydrothermal origin, and Au within the arsenopyrite exists as gold solution Au+. The Bojitian deposit was formed from As-bearing, H2S-rich, low-to-medium-temperature fluids that migrated along faults and other channels. Au that was already present in the strata or source beds migrated with the fluids in the form of Au(HS)− and ore-forming fluids were then formed in the reducing environment. The ore-forming fluids interacted with Fe-rich carbonates to form an abundance of Au-hosting arsenian sulfides.http://dx.doi.org/10.1155/2017/2417209 |
| spellingShingle | Kai Hu Moucheng Pan Jian Cao Yin Liu Shanchu Han The Au-Hosting Minerals and Process of Formation of the Carlin-Type Bojitian Deposit, Southwestern China Geofluids |
| title | The Au-Hosting Minerals and Process of Formation of the Carlin-Type Bojitian Deposit, Southwestern China |
| title_full | The Au-Hosting Minerals and Process of Formation of the Carlin-Type Bojitian Deposit, Southwestern China |
| title_fullStr | The Au-Hosting Minerals and Process of Formation of the Carlin-Type Bojitian Deposit, Southwestern China |
| title_full_unstemmed | The Au-Hosting Minerals and Process of Formation of the Carlin-Type Bojitian Deposit, Southwestern China |
| title_short | The Au-Hosting Minerals and Process of Formation of the Carlin-Type Bojitian Deposit, Southwestern China |
| title_sort | au hosting minerals and process of formation of the carlin type bojitian deposit southwestern china |
| url | http://dx.doi.org/10.1155/2017/2417209 |
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