[1]闵 康.2018.LA-ICP-MS/FT方法在矿床保存研究中的应用 ——以赣东北德兴铜矿和银山铅锌矿床为例.大地构造与成矿学,优先出版:080-91.doi:10.16539/j.ddgzyckx.2020.01.006
 MIN Kang,GAO Jianfeng.2018.Application of LA-ICP-MS/FT in the Perservation of Ore Deposits — Case Studies of the Dexing Copper Deposit and Yinshan Pb-Zn Deposit, Northeastern Jiangxi Province.Geotectonica et Metallogenia,优先出版:080-91.doi:10.16539/j.ddgzyckx.2020.01.006
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LA-ICP-MS/FT方法在矿床保存研究中的应用 ——以赣东北德兴铜矿和银山铅锌矿床为例
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《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]

卷:
期数:
2018年优先出版
页码:
080-91
栏目:
出版日期:
2020-12-30

文章信息/Info

Title:
Application of LA-ICP-MS/FT in the Perservation of Ore Deposits — Case Studies of the Dexing Copper Deposit and Yinshan Pb-Zn Deposit, Northeastern Jiangxi Province
作者:
闵 康1 2 高剑峰1 齐有强1 刘 燕1 2 杨曙光1 2
(1.中国科学院 地球化学研究所, 矿床地球化学国家重点实验室, 贵州 贵阳550081; 2. 中国科学院大学, 北京 100049)
Author(s):
MIN Kang1 2 GAO Jianfeng1 QI Youqiang1 LIU Yan1 2 YANG Shuguang1 2
(1. State Key Laboratory of Ore Deposit Geochemistry, Chinese Academy of Science, Guiyang 550081, Guizhou, China; 2. University of Chinese Academy of Science, Beijing 100049, China)
关键词:
裂变径迹 矿床保存 德兴铜矿 银山铅锌矿 赣东北
Keywords:
fission track deposits preservation Dexing copper deposit Yinshan Pb-Zn deposit Northeast Jiangxi province
DOI:
10.16539/j.ddgzyckx.2020.01.006
文献标志码:
A
摘要:
矿床保存是成矿系统研究的重要组成部分, 其中裂变径迹研究是揭示矿床保存条件和程度的有效手段之一。本文建立了LA-ICP-MS/FT方法, 该方法获得磷灰石裂变径迹年龄值与已有外探测器法分析结果对比表明这一方法是可行的。基于此方法, 对赣东北德兴铜矿与银山铅锌矿进行了磷灰石裂变径迹分析, 得到了德兴成矿岩体的磷灰石裂变径迹年龄71.4±8.6 Ma, 银山地区英安斑岩的磷灰石裂变径迹年龄为77.1±8.3 Ma。这一结果表明, 在区域整体抬升背景下, 两个矿区均以较低的剥蚀抬升速率抬升至地表。两个矿区样品磷灰石平均裂变径迹围限长度分别为12.29±1.78 μm和12.41±1.98 μm, 对应Dpar值为2.45±0.19 μm和1.84±0.17 μm, 径迹长度频度分布属于单峰型, 证实两个矿区为单向冷却过程且没有遭受后期明显的热扰动。进一步温度?间热模拟路径显示, 德兴和银山在70 Ma前经历了快速隆升过程, 然后开始缓慢抬升, 到约20 Ma开始再次快速隆升。结合前人报道的U-Th/He定年结果, 100 Ma以来, 德兴可能比银山具有相对更高的隆升量(~1 km)。
Abstract:
Deposit preservation has always been an integral part of the ore-forming system. Fission track is one of the effective tools to study deposit preservation. In this paper, apatite fission track age of reference sample obtained by LA-ICP-MS/FT is close to that of External Detector Method, indicating that LA-ICP-MS/FT dating technique is reliable. The technique is thus performed on the apatite from the Dexing copper and Yinshan Pb-Zn deposits in order to evaluate the preservation of these deposits. The AFT ages of the Dexing granodiorite porphyry and Yinshan dacite porphyry are 71.4±8.6 Ma and 77.1±8.3 Ma, respectively, with mean measured confined track length of 12.29±1.78 μm and 12.41±1.98 μm, respectively. Thermal modeled Time-Temperature path indicates the Dexing and Yinshan deposits have experienced fast uplift before Ca.70 Ma and after 20 Ma. Combined with previous U-Th/He dating results, the Dexing deposit has experienced more uplift than the Yinshan deposit (Ca. 1 km).

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[7]闵 康,高剑峰,齐有强.LA-ICP-MS/FT方法在矿床保存研究中的应用——以赣东北德兴铜矿和银山铅锌矿床为例.大地构造与成矿学,2020.44(1):080.doi:10.16539/j.ddgzyckx.2020.01.006
 MIN Kang,GAO Jianfeng,QI Youqiang.LA-ICP-MS/FT Application in Preservation Evaluation of Ore Deposits — Case Studies of the Dexing Copper Deposit and Yinshan Pb-Zn Deposit, Northeastern Jiangxi Province.Geotectonica et Metallogenia,2020.优先出版:080.doi:10.16539/j.ddgzyckx.2020.01.006

更新日期/Last Update: 2019-12-05