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| 阿尔金北缘地区韧性剪切带型金矿床构造控矿解析 | |
| 引用本文： | 陈柏林,陈宣华,王小凤,杨风,桑少杰,陈正乐,王克卓,王亚非,杨屹,李学智.阿尔金北缘地区韧性剪切带型金矿床构造控矿解析[J].地质学报,2002,76(2):235-243. |
| 作者姓名： | 陈柏林 陈宣华 王小凤 杨风 桑少杰 陈正乐 王克卓 王亚非 杨屹 李学智 |
| 作者单位： | 1. 中国地质科学院地质力学研究所,北京,100081 2. 新疆地质调查院第一地质调查所,乌鲁木齐,830011 3. 新疆地质调查院第二地质调查所,鄯善,838200 |
| 基金项目： | 新一轮国土资源大调查项目(编号K1.1.2.3)，国家305项目(编号96-915-06-01) |
| 摘 要： | 韧性剪切带型金矿是一种成矿机制与控矿因素都与韧性剪切带及其演化密切相关的金矿床类型。阿尔金北缘地区不同层次剪切带发育,金矿床受韧性剪切带控制明显,在区域上,韧性剪切带控制金矿床(点)的分布;在矿床范围内,韧性剪切带及其演化过程中形成的韧脆性剪切带既是唯一的赋(含)矿构造,也对矿化带、矿体的形态、产状、规模及分布起决定性的控制作用;压扭性韧性剪切变形特点决定了金矿化类型以蚀变糜棱岩型为主,交代蚀变作用发育。含矿构造裂隙以P型为主,少量D型和R型,个别为R~1型和T型;构造变形所引发的动力分异作用及其形成的动力变质热液是金矿成矿流体的主要来源之一,这与地球化学和成矿流体包裹体研究显示的大平沟金矿床成矿物质主要来源于变质岩、成矿流体有相当部分来源于变质水的特征相吻合。结合糜棱岩磁组构研究,发现磁各向异性度P值与金元素含量呈负相关关系,说明构造变形早于金矿化蚀变作用,这种时序关系进一步佐证了韧性剪切带型金矿床的成矿模式。即大面积的韧性变形构造动力分异作用形成的含金热液不是就地原位矿化,而是向上迁移并集中到范围比较窄小的韧-脆性或脆性裂隙中才发生金元素富集,最终形成金矿床。 |
| 关 键 词： | 构造控矿解析 金矿床 韧性剪切带 阿尔金 |
| 修稿时间： | 2001年6月20日 |
Analysis of Ore-Control ling Structure of Ductile Shear Zone Type Gold Deposits in the Northern Altun Area, Northwestern China |
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| CHEN Bailin,CHEN Xuanhu,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.Analysis of Ore-Control ling Structure of Ductile Shear Zone Type Gold Deposits in the Northern Altun Area, Northwestern China[J].Acta Geologica Sinica,2002,76(2):235-243. | |
| Authors: | CHEN Bailin CHEN Xuanhu WANG Xiaofeng YANG Feng SANG ShaojieCHEN 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 |
| 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. |
| Keywords: | analysis of ore-controlling structure gold deposit ductile shear zone Altun Mountains |
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