Analysis of Ore-Control ling Structure of Ductile Shear Zone Type Gold Deposits in the Northern Altun Area, Northwestern China
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P618.51

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    Abstract:

    The ductile shear zone type gold deposits refer to those whose ore-forming mechanism and ore-controlling factors are closely related to the ductile shear zone and its evolution. Different ductile shear zones are well devel-oped in the northern Altun area. The controls of ductile shear zone on gold deposits are as follows. (1) The re-gional distribution of gold deposits (and gold spots) is controlled by ductile shear zones. (2) The ductile-brittle shear zones formed in the evolution process of ductile shear zones both are as only ore-bearing structures and control the shape, attitude, scale and distribution of mineralization zones and orebodies. (3) The mechanical property of compression-shear ductile deformation determines that the main kind of gold mineralization is the al-tered mylonite type and main alteration is metasomatic. (4) Ore-bearing fracture systems are mainly P-type one and secondarily D-type and R-type ones, in adition R'-type and T-type one in one or two cases. (5) Dynamic differentiation and dynamic metamorphic hydrothermal solution resulting from ductile deformation is one of the sources of gold ore-forming fluids. And this is consistent with the idea drawn from the feature of fluid inclusion and geochemical characteristics of the deposit, i. e. ore-forming material resources are mainly from metamorphic rocks and ore-forming fluids are mainly composed of metamorphic water. (6) There is a negative correlation be-tween the gold abundance and susceptibility anisotropy (P) of the altered mylonite samples from the deposits, which shows that the gold mineralization is a little later than the structural deformation. All above further ex-pound the ore-forming model of the ductile shear zone type gold deposits.

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CHEN Bailin, CHEN Xuanhua, WANG Xiaofeng, YANG Feng, SANG Shaojie. CHEN Zhengle, WANG Kezhuo, WANG Yafei, YANG Yi, LI Xuezhi) Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing,) No. Team of Xinjiang Geological Survey Research Insti.2002. Analysis of Ore-Control ling Structure of Ductile Shear Zone Type Gold Deposits in the Northern Altun Area, Northwestern China[J]. Acta Geologica Sinica,76(2):235-243

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  • Received:
  • Revised:June 20,2001
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