| 铜山岭“层间矽卡岩型”多金属矿床成因探讨 |
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| 引用本文：.1986.An Investigation into the Genesis of the Tongshanling "Interformational Skarn Type” Polymetallic Deposit[J].Mineral Deposits,5(2):36~43,13 |
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| An Investigation into the Genesis of the Tongshanling "Interformational Skarn Type” Polymetallic Deposit |
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| Abstract:The Tongshanling silver-rich polymetallic deposit lies at the northern margin of the Nanling latitudinal structure and also in the NNE-trending Daoxian-Fuyang depression as well as on the west limb of the Dayuaniing anticline. It has been previously considered to be a contact metasomatic type deposit. Nevertheless, based on an investigation into such characteristics of the orebodies as the location of occurrence, shape, texture and structure of ore, mineral composition, minor elements, ore forming temperatures and sulfur isotopes, the author holds that the deposit is of stratabound-hydrothermal reformed origin.The ore bodies occur mainly in strata of Devonian Qiziqiao Formation and Xikuangshan Formation 700 m from the Yanshanian Tongshanling porphyritoid granodiorite. The Xikuangshan Formation has characteristic element association of Cu, Pb, Zn and Ag. Their contents are tens of times higher than their respective abundances in crustal carbonate rocks and their cark values, and also much greater than their contents in granodiorite. (Cu is 6 times, Pb 7 times, Zn 12 times and Ag 66 times higher than their respective contents in this intrusive body).This shows that the strata might provide abundant materials for mineralization. The Cu, Pb, Zn and Ag contents are obviously lower in the near-ore wall rocks than in the corresponding wall rocks 5000m from the intrusive body, indicating the activated transfer of these elements in the ore-bearing strata. The granodiorite body serves as a heat source of this transfer. |
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