| 钦-杭结合带斑岩型铜矿的基本地质特征及成因分析 |
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| 引用本文： | 梁锦,周永章,李红中,尹缀缀,周留煜,曾长育,虞鹏鹏.钦-杭结合带斑岩型铜矿的基本地质特征及成因分析[J].岩石学报,2012,28(10):3361-3372. |
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| 作者姓名： | 梁锦 周永章 李红中 尹缀缀 周留煜 曾长育 虞鹏鹏 |
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| 作者单位： | 1. 中山大学地球科学系,广州510275;广东省地质过程与矿产资源探查重点实验室,广州510275;中山大学地球环境与地球资源研究中心,广州510275
2. 中山大学地球环境与地球资源研究中心,广州510275;中国科学院地质与地球物理研究所,北京100029 |
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| 基金项目： | 本文受中国地质调查局项目(资[2010]矿评01-15-33)资助 |
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| 摘 要： | 钦-杭结合带是重要的斑岩铜矿带.斑岩铜矿在北、中、南三段均有产出,主成岩成矿年龄主要集中燕山期.钦-杭结合带与成矿有关的斑岩主要为钙碱性岩浆系列的中酸性岩,岩石类型主要为花岗闪长斑岩、花岗斑岩和次英安斑岩等,具有与新元古代岛弧火成岩类似微量元素特征.它们来源于软流圈的岩浆与中下地壳物质混合后部分熔融的结果,与受到过早期俯冲作用影响的岩石圈地幔有关,存在壳幔混染现象.钦-杭结合带燕山期的斑岩铜矿成岩成矿的动力学背景与太平洋板块俯冲关系密切,但斑岩和铜矿体在地球化学特征上显示出的具有弧岩浆作用特点,这与华南地区中生代构造转折事件发生以前的地质演化有关.钦-杭结合带的中酸性斑岩体来自于元古代岛弧底部玄武质岩石(下地壳)在中生代时期的部分熔融,本质上该类矿床带有岛孤俯冲环境的特征遗传.
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| 关 键 词： | 斑岩铜矿 古岛孤岩浆 板块构造 钦州湾-杭州湾结合带 |
| 收稿时间： | 6/1/2012 12:00:00 AM |
| 修稿时间： | 2012/8/21 0:00:00 |
Geological characteristics and genesis of porphyry copper deposits in Qinzhou-Hangzhou suture zone, South China |
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| LIANG Jin,ZHOU YongZhang,LI HongZhong,YIN ZhuiZhui,ZHOU LiuYu,ZENG ChangYu and YU PengPeng.Geological characteristics and genesis of porphyry copper deposits in Qinzhou-Hangzhou suture zone, South China[J].Acta Petrologica Sinica,2012,28(10):3361-3372. |
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| Authors: | LIANG Jin ZHOU YongZhang LI HongZhong YIN ZhuiZhui ZHOU LiuYu ZENG ChangYu and YU PengPeng |
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| Institution: | Department of Earth Sciences, Sun Yat-Sen University, Guagnzhou 510275, China;Guangdong Provincial Key Lab of Geological Processes and Mineral Resource Survey, Guangzhou 510275, China;Center for Earth Environment & Resources, Sun Yat-sen University, Guangzhou 510275, China;Department of Earth Sciences, Sun Yat-Sen University, Guagnzhou 510275, China;Guangdong Provincial Key Lab of Geological Processes and Mineral Resource Survey, Guangzhou 510275, China;Center for Earth Environment & Resources, Sun Yat-sen University, Guangzhou 510275, China;Center for Earth Environment & Resources, Sun Yat-sen University, Guangzhou 510275, China;Institute of Geology and Geophysics, CAS, Beijing 100029, China;Department of Earth Sciences, Sun Yat-Sen University, Guagnzhou 510275, China;Guangdong Provincial Key Lab of Geological Processes and Mineral Resource Survey, Guangzhou 510275, China;Center for Earth Environment & Resources, Sun Yat-sen University, Guangzhou 510275, China;Department of Earth Sciences, Sun Yat-Sen University, Guagnzhou 510275, China;Guangdong Provincial Key Lab of Geological Processes and Mineral Resource Survey, Guangzhou 510275, China;Center for Earth Environment & Resources, Sun Yat-sen University, Guangzhou 510275, China;Department of Earth Sciences, Sun Yat-Sen University, Guagnzhou 510275, China;Guangdong Provincial Key Lab of Geological Processes and Mineral Resource Survey, Guangzhou 510275, China;Center for Earth Environment & Resources, Sun Yat-sen University, Guangzhou 510275, China;Department of Earth Sciences, Sun Yat-Sen University, Guagnzhou 510275, China;Guangdong Provincial Key Lab of Geological Processes and Mineral Resource Survey, Guangzhou 510275, China;Center for Earth Environment & Resources, Sun Yat-sen University, Guangzhou 510275, China |
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| Abstract: | The Qinzhou Bay-Hangzhou Bay suture zone (QHSZ) is an important porphyry copper deposits (PCD) belt. PCDs are well distributed in the northern, the middle and the south sections of the QHSZ. They are mainly formed in the Yanshanian Period. Porphyries related to copper mineralization are mainly granodiorite porphyry, granite porphyry and sub-dacite porphyry, which belong to the calc-alkaline magma series of acidic rock. The porphyries above have similar trace element geochemical characteristics of the Neoproterozoic island arc igneous rock. They are derived from the partial melting of a mixture of magma in asthenosphere and the lower crustal material, and are related to the lithospheric mantle affected by earlier plate subduction, with evident crust-mantle contamination. The geodynamic setting of the Yanshanian petrogenesis and metallogenesis of the QHSZ is characterized by subduction of the Pacific plate, while the Yanshanian porphyries and copper ore bodies have the trait of island arc magma system, which is related to the geological evolution before the Mesozoic tectonic transition event in South China. It is concluded that such acidic porphyries of the QHSZ resulted from the partial melting of the Proterozoic island arc basaltic rocks during the Mesozoic, and the associated PCDs have the gene of island arc subduction environment. |
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| Keywords: | Porphyry copper deposit Magma system of ancient island arc Plate tectonic Qinzhou Bay-Hangzhou Bay suture zone |
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