| 张勇,孟庆秀,匡福祥,王冲.溧水中生代火山岩盆地特征与成矿系列[J].矿产勘查,2018,9(3):276-283 |
| 溧水中生代火山岩盆地特征与成矿系列 |
| Characteristics and metallogenic series of Mesozoic volcanic basins in Lishui |
| 投稿时间：2017-09-29 |
| DOI： |
| 中文关键词: 溧水盆地 岩石圈减薄 高钾钙碱性 成矿系列 矿床类型 |
| 英文关键词: Lishui basins, lithospheric thinning, high-potassium-calcium-alkaline, metallogenic series,type of deposits |
| 基金项目:中国地质调查局公益性矿产地质调查项目(编号:12120113070000)资助。 |
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| 摘要点击次数: 1928 |
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| 中文摘要: |
| 溧水中生代火山岩盆地位于长江中下游成矿带东端,区域构造凹陷带内同时期形成的几个知名火山岩盆地之一。其形成时间为135～128 Ma,形成于太平洋板块向亚欧板块俯冲后,板内拉伸岩石圈减薄的构造背景。盆地内中基性火山岩属于高钾钙碱性系列,地球化学数据显示,其物质来源于富集轻稀土元素和大离子亲石元素的岩石圈地幔,总体上有俯冲大洋板块交代作用的特征。在岩浆熔融深部动力学方面,主要原因是岩石圈地幔的热扰动和岩石圈伸展—减薄作用。通过对溧水盆地主成矿期和成矿作用的梳理,认为主成矿作用发生在135～128 Ma之间。主要有两个成矿系列:一个是与早期龙王山旋回中偏基性火山—次火山活动有关的Fe、Cu、Au、Pb、Zn矿化；二是观山旋回中偏碱性火山—次火山活动有关的Cu、Pb、Zn、Au、Ag矿化,以及微量元素Sr、稀散元素Ge、放射性元素U矿化。成矿类型主要有类“玢岩型”、接触交代型、高温充填交代型、低温充填型等。 |
| 英文摘要: |
| The Mesozoic volcanic basin in Lishui, which is located at the eastern end of the mineralization belt of the middle and lower reaches of the Yangtze River area, is one of several well-known volcanic basins formed in the regional tectonic depression belt at the same time.Its formation time is 135-128 Ma, which is formed in the tectonic setting of intraplate stretching and lithosphere thinning after the Pacific plate subducted to the Eurasian plate.The mediate basic volcanic rocks in inner basin belong to the high K calc-alkaline series. Geochemical data shows that the material originates from the lithosphere mantle containing rich LREE and LILE.On the whole, there are characteristics of subduction oceanic plate metasomatism.In the deep dynamics of magma melting, the main reason is the thermal perturbation of lithosphere mantle and the lithospheric thinning.According to the research of the main matellogenic stage and mineralization, the view is formed that the main metallogenic stage is between 135-128 Ma.There are two main metallogenic series:one is the early volcanic and subvolcanic activities of Longwangshan cycle which related to Fe, Cu, Au, Pb, Zn mineralization; another is late volcanic and subvolcanic activities of Guanshan cycle which related to Cu,Pb,Zn,Au,Ag and the trace elements Sr, scattered elements Ge,radioactive elements U mineralization.The main metallogenic types include “the porphyrite type”,contact metasomatic type、 high temperature filling metasomatic type and low temperature filling type etc.. |
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