| 东秦岭上宫金矿流体成矿作用:矿物学研究 |
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| 引用本文： | 李晶,陈衍景,李强之,唐国军.东秦岭上宫金矿流体成矿作用:矿物学研究[J].矿物岩石,2004,24(3):28-35. |
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| 作者姓名： | 李晶 陈衍景 李强之 唐国军 |
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| 作者单位： | 1. 北京大学造山带与地壳演化实验室,北京,100871
2. 北京大学造山带与地壳演化实验室,北京,100871;中国科学院地球化学研究所,贵州,贵阳,550002 |
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| 基金项目： | 自然科学基金(49972035和40352003)，九五攀登(95-Pre-39-04)，教育部跨世纪人才和科学院百人计划项目资助 |
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| 摘 要： | 通过对上宫金矿矿物学资料的研究，确定其成矿过程具有3阶段演化特征。早阶段以粗粒乳白色石英脉为标志，矿物破碎、变形明显，金和杂质成分含量低，形成于挤压构造背景下静岩压力的变质流体。中阶段发育细粒多金属硫化物-碲化物-自然元素组合，呈微细网脉浸染于共轭节理或裂隙，没有遭受变形，金和杂质成分含量高，自然金与其他矿物属共沉淀关系，由变质流体沸腾导致，而流体沸腾则由造山过程的地壳快速隆升剥蚀引起。晚阶段发育具梳状构造的石英-碳酸盐网脉，含金性较低，由静水压力的大气降水热液在伸展构造背景下贯入张性裂隙形成。矿床地质地球化学特征与造山型金矿一致，成矿过程同步于陆陆碰撞造山作用，属于典型的断控脉状造山型金矿，成因适合于CMF模式。
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| 关 键 词： | 金矿 矿物学 流体沸腾 成矿作用 东秦岭 |
| 文章编号： | 1001-6872(2004)03-0028-08 |
| 修稿时间： | 2004年5月18日 |
HYDROTHERMAL METALLOGENY OF THE SHANGGONG GOLD DEPOSIT,EAST QINLING:EVIDENCE FROM MINERALOGICAL STUDY |
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| LI Jing,CHEN Yan-jing.HYDROTHERMAL METALLOGENY OF THE SHANGGONG GOLD DEPOSIT,EAST QINLING:EVIDENCE FROM MINERALOGICAL STUDY[J].Journal of Mineralogy and Petrology,2004,24(3):28-35. |
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| Authors: | LI Jing CHEN Yan-jing |
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| Institution: | LI Jing~1,CHEN Yan-jing~ |
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| Abstract: | This paper documents the research results in mineralogy for the Shanggong gold depost, E Qinling, China, and defines a three-stage evolution of the hydrothermal metallogenesis. The early stage was marked by milky coloured,coarse-grained quartz veins, in which minerals were obviously broken and deformed with little gold. The early stage mineralization was caused by a lithostatic fluid-system of metamorphic origin in a compressive setting. The middle stage is characterized by fine-disseminated stockworks composed of polymetallic sulfides-tellurides-native elements. The stockworks filled in conjugate joints or other fissures,and show no deformation. Minerals of this generation contain much high gold and non-lattice elements. Native gold and minerals of the generation precipitated coevally in boiling phase of a metamorphic fluid-system. The fluid-boiling event was resulted from rapidly crustal uplift and erosion. The late stage formed comb-like quartz-carbonate veinlets with very low content of Au. In a extensional tectonic setting, input of hydrostatic, meteoric water into extensional fractures resulted in development of late-stage veinlets. Geological and geochemical characteristics of the Shanggong gold deposit was are similar to those of orogenic-type. Metallogenesis of the Shanggong deposit was coeval with continental collision between the Yangtze and North China plates. This shows that the Shanggong deposit is a typical example of orogenic-type gold deposit and its genesis can be interpreted by the CMF model. |
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| Keywords: | Shanggong gold deposit mineralogy fluid-boiling metallogenesis east Qinling |
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