| 胶东金矿集中区岩石圈结构与深部成矿作用 |
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| 引用本文： | 杨立强,邓军.胶东金矿集中区岩石圈结构与深部成矿作用[J].地球科学,2000,25(4):421-427. |
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| 作者姓名： | 杨立强 邓军 |
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| 作者单位： | 1.中国科学院地质与地球物理研究所, 北京 100101 |
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| 基金项目： | 国土资源部“百名跨世纪科技人才培养计划”基金!(No .980 8)，国家攀登计划项目!(No .95 -预 -2 5和No .95 -预 -3 9)，国家重点 |
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| 摘 要： | 利用胶东及其邻区1∶2 0万重力异常和1∶10万航磁异常探测资料, 结合地震各向异性研究成果, 解析其三维岩石圈结构.在此基础上, 综合深部结构和矿床地质特征, 探讨深部作用与成矿动力学, 深化矿床成因认识, 为科学找矿提供决策依据.研究表明, 壳幔结构的不均一性制约着成矿系统物质和能量的交换, 反映在其结构、构造和演化等多个方面.矿集区为地幔隆起带的坳陷区, 幔坳与幔隆接触部位成矿强度大, 幔隆区的局部隆起部位成矿强度小; 金矿床主要分布于花岗岩变薄部位与变质岩的接触带上; 印支中晚期郯庐断裂带深切上地幔, 通过壳-幔相互作用, 将含矿流体系统输运到更高的层位, 发生蚀变、矿化作用.艾山岩体所处构造部位的特殊性, 反映了它可能是壳幔岩浆对流侵位中心.
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| 关 键 词： | 地球物理场 岩石圈结构 深部作用 成矿动力学 胶东矿集区 山东 |
| 文章编号： | 1000-2383(2000)04-0421-07 |
| 收稿时间： | 2000-03-27 |
LITHOSPHERIC STRUCTURE AND DEEP-SEATED MINERALIZATION IN JIAODONG GOLD DEPOSIT CONCENTRATION REGION, SHANDONG, CHINA |
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| Yang Liqiang,Wang Guangjie,Zhang Zhongjie,Deng Jun,Zhao Aihua,Wang Jianping.LITHOSPHERIC STRUCTURE AND DEEP-SEATED MINERALIZATION IN JIAODONG GOLD DEPOSIT CONCENTRATION REGION, SHANDONG, CHINA[J].Earth Science-Journal of China University of Geosciences,2000,25(4):421-427. |
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| Authors: | Yang Liqiang Wang Guangjie Zhang Zhongjie Deng Jun Zhao Aihua Wang Jianping |
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| Institution: | Yang Liqiang
,Wang Guangjie
,Zhang Zhongjie
(Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100101, China)Deng Jun
(Faculty of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083, China)Zhao Aihua
(Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100101, China)Wang Jianping
(Faculty of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083, China) |
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| Abstract: | The information of geophysical field was, based on the results of 1∶1 000 00 aeromagnetic anomaly and 1∶2 000 00 Bouguer gravity anomaly in Jiaodong and its neighboring regions, Shandong, China, divided into two parts: deep-and shallow focus-field. The information of the two different fields was then combined with these of wave velocity anisotropy and deep-seated geology. The integrated result was adapted to the analysis of the three-dimension structure, the probe into deep seated mineralization and the dynamics of ore-forming system. This research indicated that the interaction and conversion of materials and energy in the ore-forming system were restricted by the heterogeneity of lithospheric structure, resulting in effects in different aspects, such as texture, tectonics and evolution. The occurrences and processes of deposit concentration region in Jiaodong were basically controlled by the transformation of tectonic regimes. The deposit concentration region is located in the down-warping area of the mantle upwelling zone, but gold deposits are located in gradient-variation and deformation places of Mohole. The major mineralization intensity is located at the junction between down-warping and upward region, while the minor one is located in the upward district of the upward region. The down-warping area of the mantle is related to the tectonic regime of compression, but the local deformation following the down-warping is connected with the tectonic regime of extension. The gold deposits, controlled by large deep seated faults and shear belts, are mainly distributed near the gradient belts of gravity anomaly and the brink of sub aeromagnetic anomaly regions, the junction between thinning positions of granites and metamorphic rocks. The Tancheng-Lujiang fault is a mature lithosphere fault of deep mantle cut, and also a fluid bearing mantle shear zone. Because of long term reduction of lithospheric thickness, the asthenosphere enriched with fluid components and metallogenic elements, occurred under the Tancheng-Lujiang fault where occurred the coupling of fluid-heat-chemistry-physics. The shear anatexis of the fault was responsible for the lithogenesis and mineralization, and also for the ore forming reactivation and migration. The mantle ore-fluid system was migrated to the upper horizon through this solution divergence and migration along the Tancheng-Lujiang fault in the middle-late Indo-Chinese epoch when the alteration and mineralization took place. The uniqueness of the tectonic position of the Aishan pluton shows that the Aishan pluton might be the center of the convection and intrusion displacement of the crustal mantle magma. |
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| Keywords: | geophysical field lithosphere structure deep seated effect mineralization dynamics deposit concentration area in Jiaodong Shandong Province |
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