| 非造山带型金矿——胶东型金矿的陆内成矿作用 |
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| 引用本文： | 翟明国,范宏瑞,杨进辉,苗来成.非造山带型金矿——胶东型金矿的陆内成矿作用[J].地学前缘,2004,11(1):85-98. |
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| 作者姓名： | 翟明国 范宏瑞 杨进辉 苗来成 |
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| 作者单位： | 中国科学院,地质与地球物理研究所,矿产资源重点实验室,北京,100029 |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划)，中国科学院知识创新工程项目，40234050，G1999043207，KZCX1-07，，， |
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| 摘 要： | 综合了全球有关金矿床的资料 ,Goldfarb和Groves等发表了著名的造山带金矿的论述 ,提出了与造山带有关的金矿在全球范围和从中太古代到整个显生宙的地质时期有广泛的分布和周期性。该类金矿的特点是与变形和变质的中地壳岩块共生 ,特别是在空间上与相应的地壳构造一致。金矿出现在造山带的不同构造部位 ,与不同的金属共生或伴生成矿。胶东作为一个重要的金矿矿集区 ,以不到中国领土面积的 0 .2 % ,而金矿产量占全国的 1 /4。国内一些地质学家也将胶东型金矿划归为造山带型金矿。最近的研究表明 ,胶东矿集区的东界与华北克拉通的东界吻合 ,金矿以华北克拉通变质岩及其有关的侵入岩为控矿围岩。主成矿期成矿时代为 (1 2 0± 1 0 )Ma ,约在不到 1 0Ma的短时限内。成矿物质具有多元性 ,既来自于控矿围岩———花岗片麻岩和变质岩 ,又来自于幔源的岩浆岩 ,特别是与中基性脉岩、偏碱的钙碱性花岗岩的侵入关系密切。除胶东金矿集区之外 ,华北克拉通的边缘和内部普遍含有金矿 ,而且金矿的物质来源、成矿方式、矿产类型、成矿围岩和成矿年龄都是一致的。这种大规模、短时限、高强度的成矿 ,被中国地质学家所重视并称为中生代成矿大爆发或金属异常巨量堆积。深部结构和成分的研究表明 ,华北东部的岩石圈在中生代急
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| 关 键 词： | 非造山带型金矿 陆内成矿作用 成矿时代 胶东 |
| 文章编号： | 1005-2321(2004)01-0085-14 |
| 修稿时间： | 2004年3月5日 |
LARGE-SCALE CLUSTER OF GOLD DEPOSITS IN EAST SHANDONG:ANOROGENIC METALLOGENESIS |
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| ZHAI Ming-guo,FAN Hong-rui,YANG Jin-hui,MIAO Lai-cheng.LARGE-SCALE CLUSTER OF GOLD DEPOSITS IN EAST SHANDONG:ANOROGENIC METALLOGENESIS[J].Earth Science Frontiers,2004,11(1):85-98. |
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| Authors: | ZHAI Ming-guo FAN Hong-rui YANG Jin-hui MIAO Lai-cheng |
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| Abstract: | Goldfarb and Groves et al. Published an important review on the gold deposits and mineralization all over the world and proposed the famous model of orogenic gold deposits. Orogenic gold deposits were formed from the Middle Archean through the Phanerozoic. This class of gold deposits is characteristically associated with deformed and metamorphosed mid-crustal blocks, particularly in spatial association with major crustal structures. The gold deposits occurred in various tectonic setting in orogenic belt and associated with different metal mineralization. As a typical area of large-scale metallogenesis and largest clusters of mineral deposits in China, the Jiaodong (East Shandong) Peninsula occupies only less than 0.2% of China's whole area, but yields about a quarter of the gold production of the whole country. Some Chinese geologists also suggested that the Jiaodong gold deposits are of orogenic gold deposits. Recent studies confirmed that the Jiaodong gold deposit cluster and the North China craton have a common eastern boundary, separating from the poor gold area and the Sulu region, respectively. The host rocks of the gold lodes are early Precambrian high-grade metamorphosed basement rocks and the Mesozoic granitoid intrusive bodies. The ore-forming ages mostly range in a short period of 10 Ma from 125 Ma to 115 Ma. Geochemical data also constrain that the metallogenic materials mainly came from the Precambrian basement of the North China craton and its subjacent mantle. The Sr-Nb-Pb and S-O-H isotopic data of the ore lodes show crust-mantle mixing characteristics, corresponding to metamorphic country rocks and intermediate-basic dykes. Gold deposits not only occur along margins of the craton, but also within the craton, forming a series of large-scale clusters. All gold deposits in the North China craton have similar characteristics in the aspects of mineral source, metallogenic process, type of ore deposit, metallogenic epoch and country rocks of ore lodes. This metallogenesis is termed as the Mesozoic metallogenic explosion, showing characteristics of huge amounts of metallogenic substances as supplements, sustained energy system and short metallogenic epoch. The studies of deep structure and composition constrain that the lithosphere of the eastern part of North China was rapidly thinned with a strong mantle-crust replacement in the Mesozoic Era, reaching a peak at 130～110 Ma. The Mesozoic tectonic inversion bears no characteristics of orogeny, and was possibly related to a regional mantle upwelling caused by the grip of the surrounding continental blocks. The Jiaodong type metallogenesis was controlled by the Mesozoic tectonic inversion, and the magma-fluid-mineralization system was derived from upwelling mantle and mantle-crust replacement. This metallogenesis is different from the orogenic gold metallogenesis. The paper summarizes gold deposits in Jiaodong and other regions in North China, and proposed a model of anorogenic gold deposits. |
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| Keywords: | anonogenic gold deposit metallogennic age geochronology East Shandong |
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