| 华北克拉通北缘浅成低温热液矿床:时空分布和构造环境 |
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| 引用本文： | 祁进平,陈衍景,李强之.华北克拉通北缘浅成低温热液矿床:时空分布和构造环境[J].矿物岩石,2004,24(3):82-92. |
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| 作者姓名： | 祁进平 陈衍景 李强之 |
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| 作者单位： | 1. 北京大学地质学系,北京,100871
2. 北京大学地质学系,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(40373007和40352003)，科学院百人计划项目，教育部跨世纪人才基金项目 |
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| 摘 要： | 华北克拉通北缘是一条近东西向的浅成低温热液成矿带，总结该成矿带金／银矿床的地质地球化学特征，初步确定矿床产于克拉通基底之上的中生代火山盆地，并集中分布于辽吉地块、燕山山脉和太行山北端，断裂构造和火山机构控制了矿床定位；矿床和成矿岩浆岩的同位素年龄集中在170Ma～100Ma；成矿流体以大气水为主，混有岩浆热液；成矿物质主要来自前寒武纪变质基底，并有盖层物质混入。讨论表明，本成矿带不可能是太平洋板块、古亚洲洋板块或蒙古-鄂霍茨克板块俯冲的直接产物，而是西伯利亚与华北古板块碰撞所致，成矿岩浆-流体系统可能起源于同碰撞期的陆内俯冲，成岩成矿作用爆发于碰撞构造演化的挤压-伸展转变体制。
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| 关 键 词： | 低温热液矿床 时空分布 金矿床 银矿床 构造背景 挤压一伸展转变期 |
| 文章编号： | 1001-6872(2004)03-0082-11 |
| 修稿时间： | 2004年6月8日 |
THE EPITHERMAL DEPOSITS IN THE NORTHERN MARGIN OF NORTH CHINA CRATON:SPATIOTEMPORAL DISTRIBUTION AND TECTONIC SETTING |
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| QI Jin-ping,CHEN Yan-jing.THE EPITHERMAL DEPOSITS IN THE NORTHERN MARGIN OF NORTH CHINA CRATON:SPATIOTEMPORAL DISTRIBUTION AND TECTONIC SETTING[J].Journal of Mineralogy and Petrology,2004,24(3):82-92. |
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| Authors: | QI Jin-ping CHEN Yan-jing |
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| Institution: | QI Jin-ping~1,CHEN Yan-jing~ |
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| Abstract: | This paper summarizes the geological-geochemical characteristics of the E-W trending epithermal Au/Ag deposits in the northern margin of North China craton.The epithermal Au/Ag deposits distribute in the Liao-Ji block,Yanshan orogen and the northern end of the Taihang Mountains,in the Mesozoic volcanic basin which was superimposed onto the cratonic basement. Occurrences of the deposits are controlled by faults and/or volcanic craters. Most of the isotope ages for ores and related igneous rocks fall in a span of 170 Ma~100 Ma. The ore-forming fluid-systems were dominated by meteoric water, with input of magmatic fluid, as traced by D-O isotope systematics. Ore metals, indicated by S-Pb isotopes, were mainly sourced from Precambrian basement and contaminated by cover-strata of the craton. Consequently, it is argued that the metallogenic belt along the northern margin of the North China craton was resulted from the Siberia-North China continental collision, instead of from the subduction of the Paleo-Asian, Pacific and Mongol-Okhotsk oceanic plates. The metallogenic magma-fluid systems were originated from intracontinental (A-type) subduction during continental collision. The large-scale granitic magmatism and metallogenesis occurred at transition regime from collisional compression to extension. |
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| Keywords: | epithermal system Au/Ag deposit tectonic setting transition from compression to extension Northern margin of North China craton |
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