长江中下游成矿带成矿规律和成矿模式  

Metallogenic regularity and metallogenic model of the Middle-Lower Yangtze River Valley Metallogenic Belt

作　　者：周涛发[1,2] 范裕 王世伟[1,2] Noel C WHITE 

机构地区：[1]合肥工业大学资源与环境工程学院,合肥230009 [2]合肥工业大学矿床成因与勘查技术研究中心,合肥230009

出　　处：《岩石学报》2017年第11期3353-3372,共20页Acta Petrologica Sinica

基　　金：国家重点研发计划(2016YFC0600206);国家自然科学基金项目(41320104003;41672081);中国地质调查局地质调查工作项目(【2013】01-033-017)联合资助

摘　　要：长江中下游成矿带作为中国东部重要的成矿带之一,成矿地质条件、成矿规律和成矿模式的相关研究已经十分深入,形成了一系列公认的理论研究成果,本文重点论述了成矿带成矿地质条件和成矿规律方面研究的新进展,并在此基础上构筑了成矿带的成矿模式。本文主要开展了以下总结工作:(1)将成矿带的构造要素突破以往按构造单元分解的做法,确立跨构造单元的"复合构造系统",结合成矿带成岩成矿作用特点,重新确定了长江中下游成矿带的范围,并对成矿亚带进行了重新划分;(2)收集汇总了长江中下游成矿带近年来国内外学者最新的成岩成矿年龄数据,总结了矿床时空分布规律;(3)从地质,地球物理和地球化学等方面,总结归纳了沿基底结合带复活的网状断裂系统,阐明了成矿带的控矿构造格架,分析了长江中下游成矿带的成因规律;(4)补充和完善了断隆区和断凹区的成矿模式,并初步构筑了长江中下游成矿带综合成矿模式。提出长江中下游成矿带内主体成岩成矿作用总体上分为走滑挤压阶段(146~135Ma)、走滑引张阶段(135~126Ma)和拉张伸展阶段(126~123Ma)等三个阶段,古太平洋板块作用导致的壳幔过程,引发含元古代弧岩浆岩源区活化和中生代的构造活化("双活化")是长江中下游成矿带形成的主要机制。The Middle-Lower Yangtze River Valley Metallogenic Belt （MLYB） is one of the most important metallogenic belts in China. There are extensive studies on ore-foiming geologic conditions, metallogenic regularity as well as metallogenic models in the past decades, a series of theories on the formation of ore deposits in MLYB have been proposed and recognized. In this paper the new advances on ore-forming geological conditions, metallogenic regularity of the MLYB have been reviewed, and a new model for the mineralization in the MLYB has been constructed. Based on compound structural system, the range and snb-metallogenic domains of the MLYB have been redesigned. Through collecting and analysis of the newly published isotopic age dating data, the spatial-temporal of ore deposits in MLYB has been set up. After analysis the geological, geophysical and geochemical information, the re-worked complex net fault structural system that controll the intrusions and ore deposits are outlined. Finally, a compensate model for the MLYB, the fault-uplifted areas and fault-depressions are constructed accordingly. We propose that the overall processes of the metallogeny underwent three stages： the strike-slip eompressional stage （146 - 135Ma） , the strike-slip tensile stage （135 ~ 126Ma） , and the stretching extensional stage （ 126 ~ 123Ma）. The mantle-crust interaction stimulated by the far stress field of the Paleo-Pacific plate subduction led to the reworking of the Neoproterozoie subduced arc magmatic material stored in the the lower crust or lithospheric mantle and the reactivation of the fault system that formed during the collision between the North China Block and the South China Block in Mesozoic. This ＂source reworking plus structure reworking （ double rework ） ＂ is the major mechanism that governed the evolution and formation of the MLYB.

关 键 词：长江中下游成矿带 成矿规律 成矿模式 成矿背景 

分 类 号：P612[天文地球—矿床学]