| 摘要: |
| 新元古代晋宁期是会理-东川地区铜矿的主要成矿时期,成矿时间较长,跨越了新元古代坳拉槽回返褶皱封闭阶段(1000~900M a)和地幔上涌拉张阶段(900~740M a)。在坳拉槽回返褶皱封闭阶段,南北向挤压促进了成矿元素的活化和迁移,使成矿物质重新富集。坳拉槽地幔上涌拉张阶段,辉长岩的侵入是会理-东川坳拉槽伴随Rodinia超大陆裂解的重要岩浆事件。辉长岩的侵位为成矿元素的重新活化、迁移、富集提供了强大的热动力,最终形成拉拉地区巨量金属元素的富集。 |
| 关键词: 会理-东川 坳拉槽 新元古代 构造-岩浆事件 成矿响应 |
| DOI： |
| 附件 |
|
| 基金项目:科技部国际科技合作项目(2005DFA20063) |
|
| Mineralization responses of the Lala copper deposit in Huili,Sichuan to the Neoproterozoic tectonic-magmatic events within the Huili-Dongchuan aulacogen |
| ZHOU Jia-yun, ZHU Zhi-min, CHEN Jia-biao, SHEN Bing, LI Xiao-yu, LUO Li-ping |
| (Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences, Chengdu 610041, Sichuan, China) |
| Abstract: |
| The Huili-Dongchuan aulacogen extending across Sichuan and Yunnan is an important Proterozoic copper metallogenic province in China,and the Jinningian is a major metallogenic period during the Neoproterozoic.This long period of metallogenesis spanned the folding and closure stage(1 000-900 Ma) and mantle upwelling and extensional stage(900-740 Ma) of the aulacogen.During the folding and closure stage of the aulacogen,the N-S-trending compression facilitated the reactivation and migration of the ore-forming elements from the ore horizons,and concentration of the ore-forming matter.The gabbro emplacement is interpreted as an important magmatic event within the Huili-Dongchuan aulacogen in response to the breakup of supercontinent Rodinia during the mantle upwelling and extensional stage.The relationship between the gabbro emplacement and copper deposit distribution shows that abundant heat derived from the gabbro emplacement has provided powerful thermal dynamics for the reactivation,migration and concentration of the ore-forming elements from the ore horizons,and finally facilitated the enrichment of abundant metallic elements in the Lala region,Sichuan. |
| Key words: Huili-Dongchuan region aulacogen Neoproterozoic tectonic-magmatic event mineralization response |
