摘要
江浪穹隆是扬子地台西缘变质核杂岩带中比较典型的一个变质核杂岩体,具有良好的成矿物理化学条件,以存在一系列铜硫化物矿床而著称。中咀铜矿的成矿作用表现出多期次、多成因的特点,其成矿与江浪变质核杂岩的形成和演化有着密切的成因联系。本文应用构造解析方法,对江浪穹隆北部的中咀铜矿进行了构造解析和成矿规律研究。通过野外构造解析,结合相关同位素测年资料,初步确定中咀铜矿含矿岩系经历至少6个世代的构造变形,并认为矿体主要受华力西期顺层韧性剪切带和燕山期成穹过程中形成的重力滑脱带控制,本文从矿源、热源、成矿元素活化、增生富集和成矿空间等方面探讨了其成矿过程和矿床成因,建立了中咀铜矿的成矿模式,对在江浪变质穹窿周缘寻找同类型矿体指出了明确的层位和构造部位,指明了下一步重点找矿方向。
Jiangtang Dome lies at the western margin of the Tibetan Plateau, which has been identified as a metamorphic core complex. It has good ore-forming physicochemical conditions and is well known in China because it contains several Cu-sulfide deposits. Zhongzui copper deposit is characterised by polyphyletic, polyphase and polygenetic features, and has very close relationship with the evolution of Jianglang metamorphic core complex. This study is focused on the structure and metallogenic conditions of the Zhongzui copper deposit from the northern portion of the Jianglang Dome. On the basis of detailed field observations, structural previous, and previous radiometric ages, we suggest that the ore-bearing rock series in Zhongzui copper deposit underwent at least six stages of deformation, which were recorded by a series of foliations, and the ore bodies are mainly controlled by Variscan ductile shear zone and major Yanshanian gravitational sliding zones. In this contribution, we studied the ore-forming process and origin of the Zhongzui copper deposit including its ore-forming source, heating source, metal mobilization, enriching process and precipitation locations, established a single metallogenetic model, and presented some prospecting locations for similar copper deposits in the Jianglang Dome.
出处
《高校地质学报》
CAS
CSCD
北大核心
2013年第1期95-108,共14页
Geological Journal of China Universities
基金
国家自然科学基金青年基金(编号:41202067,41202048)
“四川省九龙县里伍铜矿矿产预测”(编号200651055)
“四川省九龙县里伍铜矿接替资源勘查”项目(编号200851022)联合资助
关键词
构造解析
韧性剪切带
重力滑脱带
变质核杂岩
Structural analysis
Ductile shear zone
Gravitational sliding zone
Metamorphic core complex
