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长江中下游成矿带九瑞矿集区叠合断裂系统和叠加成矿作用
引用本文:蒋少涌,孙岩,孙明志,边立曾,熊永根,杨水源,曹钟清,吴亚民.长江中下游成矿带九瑞矿集区叠合断裂系统和叠加成矿作用[J].岩石学报,2010,26(9):2751-2767.
作者姓名:蒋少涌  孙岩  孙明志  边立曾  熊永根  杨水源  曹钟清  吴亚民
作者单位:1. 内生金属矿床成矿机制研究国家重点实验室,南京大学地球科学与工程学院,南京210093
2. 江西地质矿产勘查开发局赣西北大队,九江,332000
3. 江西铜业集团公司武山铜矿,瑞昌,332204
基金项目:本文受科技部十一五科技支撑计划项目(2006BAB01B06)、江苏省自然科学重点课题(BK2008026)和国家自然科学基金项目(41072055)联合资助.
摘    要:通过矿坑和地表勘察并结合区域构造分析,初步阐述九瑞矿集区叠合断裂系统和叠加成矿作用及其相互匹配关系。与矿有关的断裂梳理成海西期陆缘同生断裂,印支期褶皱断裂和燕山晚期负反转断裂三个系统,并以武山铜矿的F1断层对其在三期断裂系统中的交接复合和成矿作用进行了个例描述,综合三个时期的地质勘探和野外及室内观测资料提出一个三阶段的成因模式。即:第一阶段为海西期,此时陆缘伸展、掀斜和裂陷活动引发张性同生断裂,顺层-切层(阶梯状)生长断裂发育。此阶段晚期通过与深构造位的隐伏断裂交接复合可形成海底火山和热液通道,喷流沉积形成层(块)状含铜黄铁矿。第二阶段为印支期,此阶段发育背驼式或叠瓦式构造类型,且逆掩-逆冲构造很可能将第一阶段形成的层状矿体逆向移位上推。第三阶段为燕山晚期,此时发生高角度冲断和区域应力场变更,有利于断裂由压性转为张性,形成负反转构造,断裂扩张,与燕山期岩浆热液有关的成矿溶液上升,再次叠加成矿。

关 键 词:叠合断裂  叠加成矿  同生断裂  反转构造  九瑞地区
收稿时间:7/1/2010 12:00:00 AM
修稿时间:2010/8/15 0:00:00

Reiterative fault systems and superimposed mineralization in the Jiurui metallogenic cluster district, Middle and Lower Yangtze River mineralization belt, China.
JIANG ShaoYong,SUN Yan,SUN MingZhi,BIAN LiZeng,XIONG YongGen,YANG ShuiYuan,CAO ZhongQing and WU YaMin.Reiterative fault systems and superimposed mineralization in the Jiurui metallogenic cluster district, Middle and Lower Yangtze River mineralization belt, China.[J].Acta Petrologica Sinica,2010,26(9):2751-2767.
Authors:JIANG ShaoYong  SUN Yan  SUN MingZhi  BIAN LiZeng  XIONG YongGen  YANG ShuiYuan  CAO ZhongQing and WU YaMin
Affiliation:State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China;State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China;State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China;State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China;State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China;State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China;Northwestern Jiangxi Geological Team, Bureau of Exploration and Development of Geology and Mineral Researches of Jiangxi Province, Jiujiang 332000, China;Wushan Copper of Copper Mining Industry Group Company, Jiangxi Province, Ruichang 332204, China
Abstract:Based on detailed underground and field observation together with regional structure analysis, this paper discussed the feature and evolution of the reiterative fault system and superimposed mineralization and their relationship in the Jiurui ore concentrated district, Jiangxi Province, China. Three fault systems are described, namely, the Hercynian syn-sedimentary fault system developed along the continental margins, Indosinian folding and fault system, and Late Yanshanian negative inversion fault system. Taking the Wushan copper deposit as an example, we revealed the initiation and development of F1 fault during the three stages and their controls on mineralization. A three-stage conceptual model is proposed as following. During the first Hercynian stage, extension and rifting occurred along the continental margins and a two sub-stage of syn-sedimentary fault system developed. In the later sub-stage, the tensile fractures combined with the deep-seated fault developed which allow the submarine volcanic eruption and hydrothermal ore-forming fluids ascend to form bedded and massive copper-bearing pyrite orebodies. During the second Indosinian stage, the folding and fault development may have caused reverse movement of the previously deposited sedimentary bedded orebodies. During the thrid stage of Late Yanshanian, development of high angle fold-thrust and regional stress may have caused the fault system transformed from compressive into brittle tensile structures, and formed negative inversion structure. Together with the faulting, magmatic-hydrothermal fluids contributed to formation of new orebodies that were superimposed on previous syn-sedimentary mineralization system.
Keywords:Reiterative fault systems  Superimposed mineralization  Syn-sedimentary fault  Inversion structures  Jiurui ore district
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