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二密铜矿区松顶山次火山岩成矿作用及找矿方向
- 宋爽|赵华伟|王春阳|刘学生|臧兴运
- 作者单位：
- 吉林省矿产勘查开发研究院|吉林省地质调查院|吉林省地质调查院|吉林省地质调查院|吉林省地质调查院
基金项目：
- isnull
详细信息：
- 作者简介：
- 宋爽（1985—），女，辽宁营口人，工程师，从事环境地质勘查工作;长春市南昌路120号，吉林省矿产勘查开发研究院，130061；E-mail：370426907@qq.com
- 通讯作者：
- isnull
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Metallogenesis of Songdingshan sub-volcanic rocks and prospecting direction in Ermi Copper District
- English Author：
- Mineral Exploration Development Institute of Jilin Province|Geologic Survey Institute of Jilin Province|Geologic Survey Institute of Jilin Province|Geologic Survey Institute of Jilin Province|Geologic Survey Institute of Jilin Province
- Unit：
- 摘要
- 在线预览
- 参考文献
摘要:
二密铜矿床受控于早白垩世松顶山火山机构。为实现找矿突破，指导找矿工作，以成矿地质条件为基础，分析了火山机构内次火山岩成岩成矿作用，并对找矿方向提出了新的认识。研究表明，松顶山火山机构主要有闪长岩、石英闪长岩、石英二长闪长岩、花岗斑岩4次岩浆侵入活动，前3次均发育有主火山口相、寄生火山口相，而与铜成矿作用关系密切的花岗斑岩仅发现有寄生火山口相。结合同期次流纹岩等喷发物分布范围等实际地质资料，认为松顶山火山机构内部很有可能发育隐伏的主火山口相花岗斑岩体，应作为主要找矿方向之一。
关键词:
二密铜矿区；火山机构；主火山口；寄生火山口；松顶山复式岩体；成矿作用；找矿方向
Abstract:
Ermi Copper Deposit is controlled by Early Cretaceous Songdingshan volcanic organization.In order to achieve prospecting breakthroughs and instruct prospecting work,the paper analyzed the diagenesis and metallogenesis of the volcanic rocks inside the volcanic organization based on ore-forming geologic conditions,and came up with new understanding of prospecting direction.The study shows that the Songdingshan volcanic organization mainly includes 4 magmatic intrusions: diorite,quartz diorite,quartz monzodiorite and granite porphyry.The former 3 all develop main crater phase and parasitic crater phase while the granite porphyry closely related to copper mineralization only is detected with parasitic crater phase.Judging from the practical geologic data including the distribution range of the erupted materials in the same phase such as rhyolite,it is considered that it is likely that there develop concealed main crater phase granite porphyry rock mass inside the Songdingshan volcanic organization and the area should be considered as one of the major prospecting directions.
Keywords:
Ermi Copper District;volcanic organization;main crater;parasitic crater;Songdingshan rock mass;metallogenesis;prospecting direction
