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西南三江中甸地区晚白垩世斑岩型Mo-Cu矿床岩浆侵入热史演化的磷灰石、锆石裂变径迹年代学研究
投稿时间:2020-02-24  修订日期:2020-06-16  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020099
摘要点击次数: 105
全文下载次数: 145
作者单位地址
刘学龙 昆明理工大学 云南省昆明市一二一大街文昌巷1号
杨志明 中国地质科学院地质研究所 
卢映祥 云南省地质调查局自然资源部三江成矿作用及资源勘查利用重点实验室 
梅社华 香格里拉市鼎立矿业有限责任公司 
张娜 昆明理工大学 
陈建航 昆明理工大学 
刘思晗 昆明理工大学 
朱俊 昆明理工大学 
罗应 昆明理工大学 
李振焕 昆明理工大学 
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。
中文摘要: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±5Ma之间;磷灰石裂变径迹的年龄值变化于15±1~48±3Ma,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1阶段(96~60Ma),主要为岩浆侵位后的快速降温的热史演化阶段;第2阶段(52~39Ma),为缓慢的降温作用过程;第3阶段(16~15Ma),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。
中文关键词: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
 
LIU Xuelong1,2), YANG Zhiming2), LU Yingxiang3), MEI Shehua4), ZHANG Na1), ZHU Jun1,3), CHEN Jianhang1), LUO Ying1), LI Zhenghuan1)1) Kunming University of Science and Technology, Kunming, Yunnan, 650093, China
Author NameAffiliationAddress
liuxuelong Kunming University of Science and Technology 云南省昆明市一二一大街文昌巷1号
Yang zhiming Institute of Geology, Chinese Academy of Geological Sciences 
Lu Yinxiang Key Laboratory of Sanjiang Mineralization and Resource Exploration and Utilization, Ministry of Land and Resources 
Mei Shehua Dingli Mining Co., Ltd. of Shangri-La, Shangri-La Yunnan 
Zhang Na Kunming University of Science and Technology 
Chen Jianhang Kunming University of Science and Technology 
Liu Sihan Kunming University of Science and Technology 
Zhu Jun Kunming University of Science and Technology 
Luo Yin Kunming University of Science and Technology 
Li Zhenhuan Kunming University of Science and Technology 
Abstract: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. And we 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±5Ma, the age of AFT varies between 15±1~48±3Ma, 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 (96~60Ma), It is mainly the thermal history evolution stage of rapid cooling after magmatic emplacement; the second stage (52~39Ma) is a slow cooling process; The third stage (16~15Ma) reveals that the area experienced a rapid cooling geological evolution due to the impact of uplifting orogeny on the Qinghai-Tibet Plateau since the Miocene. Thermal history inversion results of ZFT and AFT shown that the typical Late Cretaceous ore-forming porphyry have similar uplift processes and denudation history in the Zhongdian area, and obtained the quantitative calculation results of amount and rate of the erosion, it provide a scientific reference for the resource potential evaluation and exploration in the area.
keywords:porphyry Mo-Cu deposit  Zircon  Apatite  Fission track  uplift and erosion  Zhongdian area  Southwest Sanjiang
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