| 西藏甲玛铜多金属矿床铜山矿体为manto型矿体? |
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| 关键词:manto skarn porphyry copper metallogenic systems Jiama Tibet Gangdise metallogenic belt |
| 基金项目:国土资源部公益性行业专项(编号: 201511022-02) |
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| Is Tongshan Orebody in the Jiama Copper-polymetallic Deposit Manto-type Ore? |
| Manto-type mineralization refers to replacement along strata and is characterized by stratabound nature, obvious structural control, high grade, and sulfide-rich ore. The Jiama deposit, a superlarge porphyry-skarn deposit, is located in the east of Gangdise metallogenic belt, Tibet. It has been the important achievement of the combination of nonprofit exploration with commercial prospecting. Tongshan (south pit) orebody is a prospecting breakthrough after exposing Jiama concealed porphyry orebody. The proven resources of the Tongshan orebody reach >0.7 Mt Cu, 0.02 Mt Mo, 1.2 Mt Pb+Zn, 20 t Au, and 2 000 t Ag. Tongshan orebody is 1km away from the porphyry center. Tongshan orebody is controlled by Tongshan gliding nappe structure, in which there are many secondary folds and fractures that provided space for migration and precipitation of hydrothermal fluid. Tongshan orebody, hosted in the Linbuzong Formation hornfels, Duodigou Formation marbles, and the interlayer detachment zone between the Linbuzong Formation hornfels and the Duodigou Formation marbles, exhibits lenticular, veined, cystic, and podiform forms. Tongshan orebody is sulfide-rich and includes chalcopyrite, sphalerite, galena, bornite, magnetic pyrite, pyrite, and molybdenite. The average grade of Cu is 0.99%, and that of Pb+Zn is 2.88%. These geological findings led the authors to believe that Tongshan orebody are distal manto-type ore of the porphyry copper system, as evidenced by field geological investigation and comparison with other manto-type deposits. This is for the first time a deposit of this significant type was found and verified in Gangdise belt, which is of great guiding significance in search for peripheral manto-type ore deposits in other porphyries and skarn deposits in the Gangdise metallogenic belt. It has high economic significance, and the southern open pit which can process forty thousand tons per day has been built. |
| TANG Pan,TANG Ju-xing,ZHENG Wen-bao,LENG Qiu-feng,LIN Bin,TANG Xiao-qian,WANG Hao,GAO Xin,ZHANG Ze-bin,ZHOU Hong-bing.2017.Is Tongshan Orebody in the Jiama Copper-polymetallic Deposit Manto-type Ore?[J].Acta Geoscientica Sinica,38(5):829-838. |
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