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云南中甸地区晚白垩世斑岩型Mo-Cu矿床磷灰石、锆石裂变径迹年代学研究 被引量:2

Apatite and zircon fission track chronology of the Late Cretaceous porphyry Mo-Cu deposits in the Zhongdian area,Yunnan
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摘要 云南中甸地区位于西南三江铜钼铅锌金多金属矿集区的南端,是一个独具特色的Cu-Mo多金属复合叠加成矿带。本文采用裂变径迹低温热年代学技术对区内晚白垩世铜厂沟、休瓦促、热林成矿斑岩体,进行了锆石、磷灰石裂变径迹分析测试,开展了晚白垩世以来的构造热史演化模拟,揭示了区内构造-岩浆成矿事件及热史演化过程。研究表明,锆石裂变径迹年龄值变化于52±2~96±5 Ma;磷灰石裂变径迹的年龄值变化于15±1~48±3 Ma,总体变化幅度不大,中心年龄与池年龄在误差范围也基本一致。通过锆石、磷灰石的裂变径迹分析,揭示出云南中甸地区自晚白垩世以来主要经历了三个阶段的构造热事件。第一阶段(96~60 Ma),主要为岩浆侵位后快速降温的热史演化阶段;第二阶段(52~39 Ma),为缓慢的降温作用过程;第三阶段(16~15 Ma),揭示了受中新世以来青藏高原隆升造山作用的影响,该区经历了快速降温的地质演化过程。综合锆石裂变径迹、磷灰石裂变径迹的热史反演结果,表明区内晚白垩世典型成矿斑岩体具有相似的隆升过程和剥蚀历史,并获得了剥蚀量与剥蚀速率的定量计算结果,为区内矿床的资源潜力评价及勘查工作提供了科学参考。 The Zhongdian area is located in the southern edge of the Sanjiang Cu-Mo-Pb-Zn-Au polymetallic aggregation area,which is a unique Cu-Mo multi-metal composite superimposed ore belt.In this paper,zircon fission track(ZFT)and apatite fission track(AFT)analysis tests were performed on the Late Cretaceous Tongchanggou,Xiuwacu,and Relin metallogenic porphyry using fission track low-temperature thermochronology technology.We also conducted tectonic thermal history evolution simulations since the Late Cretaceous,revealing the tectonic-magmatic mineralization events and thermal history evolution processes in this area.Studies have shown that the age of ZFT varies between 52±2~96±5 Ma,the age of AFT varies between 15±1~48±3 Ma,the age of the center and the pool are basically the same.The fission track analysis of zircon and apatite revealed that the Zhongdian area of Yunnan has experienced three stages of tectonic thermal events since the Late Cretaceous.The first stage(96~60 Ma)was mainly the thermal history evolution stage of rapid cooling after magmatic emplacement.The second stage(52~39 Ma)was a slow cooling process.In the third stage(16~15 Ma)the area experienced a rapid cooling due to the impact of uplifting orogeny on the Qinghai-Tibet Plateau since the Miocene.The thermal history inversion results of ZFT and AFT show that the typical Late Cretaceous ore-forming porphyry have similar uplift processes and denudation history in the Zhongdian area,and the obtained quantitative calculation results of amount and rate of the erosion provide a scientific reference for the resource potential evaluation and exploration in the area.
作者 刘学龙 杨志明 卢映祥 梅社华 张娜 朱俊 陈建航 刘思晗 李振焕 LIU Xuelong;YANG Zhiming;LU Yingxiang;MEI Shehua;ZHANG Na;ZHU Jun;CHEN Jianhang;LIU Sihan;LI Zhenhuan(Kumnming University of Science and Technology,Kunming,Yunnan 650093,China;Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China;Key Laboratoryof Sanjiang Mineralization and Resource Exploration and Utilization,Ministry of Land and Resources,Kunming,Yunnan 650051,China;Dingli Mining Co.LTDof Shangri-La,Shangri-la,Yunnan 674400,China)
出处 《地质学报》 EI CAS CSCD 北大核心 2021年第11期3366-3379,共14页 Acta Geologica Sinica
基金 云南省基础研究计划项目(编号2019FB062、2019FA018) 国家自然科学基金项目(编号41862009) 云南省科学技术奖-杰出贡献奖项目(编号2017001) 云南省万人计划“青年拔尖人才”专项(编号20190028)联合资助的成果。
关键词 斑岩型钼铜矿 锆石 磷灰石 裂变径迹 隆升-剥蚀 中甸地区 西南三江 porphyry Mo-Cu deposit zircon apatite fission track uplift and erosion Zhongdian area southwestern Sanjiang
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