钦杭结合带成矿地质背景及成矿规律

发布时间：2018-05-03 05:14

本文选题：钦杭结合带(成矿带) + 华夏板块　；参考：《岩石学报》2017年03期

【摘要】：钦杭成矿带是钦州湾-杭州湾成矿带的简称,具有矿床规模大、矿床分布密集、矿床类型齐全、伴生组分多样的显著特点,是中国地质调查局规划的全国重点成矿区带。钦杭成矿带又称为钦杭(构造)结合带,大地构造位置对应于扬子板块和华夏板块的接合带。研究显示,钦杭带是一条古老俯冲带。它在古生代仍存在洋壳,属于洋陆俯冲体系。中生代构造转换是一个重要的地质事件,它使钦杭带由特提斯构造域卷入到西太平洋构造域中,大地构造性质从华夏和扬子板块之间的板块构造机制为主,转为陆内岩石圈拉张伸展构造环境,并产生巨大的地质效应,最突出的是燕山期岩浆的大规模活动以及成矿作用的大爆发。燕山期花岗岩存在确切的幔源端元信息,幔源物质参与了许多矿床的形成,并为最近钨多金属矿床北拓找矿所验证。钦杭结合带是重要的斑岩铜(钼)矿带,斑岩铜(钼)矿在钦杭结合带北、中、南三段均有产出,它们的主成岩成矿年龄是燕山期,但带有古老俯冲带岛弧体系的基因。钦杭带也是一条古海洋喷流热水沉积矿床密集分布带,VMS型铜多金属矿床和SEDEX型铅锌多金属矿床发育。钦杭带是一条古老俯冲带改造成矿带,古老俯冲带经燕山期改造/叠加成矿是钦杭成矿带的重要成矿机制。
[Abstract]:The Qinzhou-Hangzhou metallogenic belt is the abbreviation of Qinzhou-Hangzhou Bay metallogenic belt, which has the remarkable characteristics of large scale of deposit, dense distribution of ore deposit, complete deposit type and various associated components. It is a national key metallogenic belt planned by China Geological Survey. The Qinghang metallogenic belt, also known as the Qinghang (tectonic) belt, corresponds to the junction zone between the Yangtze plate and the Huaxia plate. Research shows that the Qinghang belt is an ancient subduction zone. The oceanic crust still exists in Paleozoic and belongs to oceanic subduction system. Mesozoic tectonic transformation is an important geological event, which caused the Qinghang belt to be involved in the western Pacific tectonic domain from the Tethys tectonic domain. The tectonic nature of the Qinghang belt is dominated by the plate tectonics between the Cathaysian and Yangtze plates. The extensional tectonic environment in the continental lithosphere was transformed into an extensional tectonic environment with great geological effects, the most prominent of which was the large-scale magmatic activity and the explosion of mineralization in Yanshanian period. The Yanshanian granites have exact mantle source terminal element information and mantle-derived materials are involved in the formation of many deposits and have been verified by the recent northward prospecting of tungsten polymetallic deposits. Qinghang binding belt is an important porphyry copper (molybdenum) ore belt. Porphyry copper (molybdenum) deposits occur in the northern, middle and southern members of the Qinghang binding belt. Their main diagenetic and metallogenic ages are Yanshanian, but with genes of the island arc system of the ancient subduction zone. The Qinghang belt is also a dense distribution zone of paleooceanic jet hydrothermal deposits. The SEDEX type copper polymetallic deposits and the SEDEX type lead zinc polymetallic deposits are developed. The Qinghang belt is an ancient subduction belt transformed into a metallogenic belt. It is an important metallogenic mechanism of the Qinghang metallogenic belt that the ancient subduction belt is reformed / superimposed by Yanshanian period.
【作者单位】：中山大学地球环境与地球资源研究中心;广东省地质过程与矿产资源探查重点实验室;中山大学地球科学与工程学院;
【基金】：国家重点研发计划重点专项项目(2016YFC0600506) 国家自然科学基金项目(41273040) 中国地质调查局项目(12120113067600) 高校基本科研业务费中山大学科研助手资助计划联合资助
【分类号】：P618.2

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