| 西藏东窝东矿床矿化蚀变过程元素迁移及绢云母~(40)Ar-~(39)Ar年代学及其地质意义 |
| |
| 引用本文： | 侯淋,唐菊兴,林彬,宋扬,王勤,李玉彬,冯军,李彦波,陈列,唐晓倩.西藏东窝东矿床矿化蚀变过程元素迁移及绢云母~(40)Ar-~(39)Ar年代学及其地质意义[J].岩矿测试,2017,36(4):440-449. |
| |
| 作者姓名： | 侯淋 唐菊兴 林彬 宋扬 王勤 李玉彬 冯军 李彦波 陈列 唐晓倩 |
| |
| 作者单位： | 中国地质大学(北京)地球科学与资源学院, 北京 100083,中国地质科学院矿产资源研究所, 北京 100037,中国地质科学院矿产资源研究所, 北京 100037,中国地质科学院矿产资源研究所, 北京 100037,成都理工大学, 四川 成都 610059,西藏自治区地质调查院, 西藏 拉萨 850012,西藏金龙矿业股份有限公司, 西藏 拉萨 850000,西藏地质矿产勘查开发局第五地质大队, 青海 格尔木 816000,西藏地质矿产勘查开发局第五地质大队, 青海 格尔木 816000,北京中矿联咨询中心, 北京 100044 |
| |
| 基金项目： | 国家公益性行业科研专项"斑岩-浅成低温热液成矿系统研究及勘查评价示范——以西藏多龙整装勘查区为例"（201511017） |
| |
| 摘 要： | 东窝东铜多金属矿床位于羌塘地体南缘,多龙铜金矿集区东侧。该矿床尚未开展矿化蚀变时限、成矿作用中元素迁移特征等问题的研究。为确定矿床的蚀变矿化作用时限,本文对东窝东矿床的黄铁绢英岩化蚀变带中的蚀变绢云母进行了~(40)Ar-~(39)Ar年代学测试,获得~(40)Ar-~(39)Ar坪年龄为122.20±0.84 Ma,该年龄与已有的斑岩体侵位时代(122 Ma)一致,说明东窝东矿床黄铁绢英岩化蚀变与斑岩体侵位有密切联系。此外,对比分析地表弱蚀变和钻孔中强黄铁绢英岩化花岗闪长斑岩的岩石地球化学结果,运用"等浓度线(isocon)方程"及其推导方程,探讨黄铁绢英岩化蚀变过程中的不同元素的带入、带出特点及元素迁移特征。结果表明:高场强元素质量基本守恒;轻稀土元素较重稀土元素迁移量较大,但总体上稀土元素的迁移程度较弱;主要的成矿元素Cu、Pb、Zn为带入元素。东窝东矿床含矿斑岩侵位时代和热液蚀变时限均与多龙矿集区内多不杂、波龙、铁格隆南等多个超大型-大型铜金矿床一致,说明东窝东矿床和多龙矿集区内的多个矿床受控于同一构造-岩浆成矿背景,东窝东矿区具有重要的找矿潜力。
|
| 关 键 词： | 绢云母 40Ar-39Ar年代学 元素迁移 东窝东 西藏 |
| 收稿时间： | 2016/12/5 0:00:00 |
| 修稿时间： | 2017/7/12 0:00:00 |
Element Migration during Alteration and 40Ar/39Ar Dating of Sericite from the Dongwodong Deposit, Tibet and Its Geological Significance |
| |
| HOU Lin,TANG Ju-xing,LIN Bin,SONG Yang,WANG Qin,LI Yu-bin,FENG Jun,LI Yan-bo,CHEN Lie and TANG Xiao-qian.Element Migration during Alteration and 40Ar/39Ar Dating of Sericite from the Dongwodong Deposit, Tibet and Its Geological Significance[J].Rock and Mineral Analysis,2017,36(4):440-449. |
| |
| Authors: | HOU Lin TANG Ju-xing LIN Bin SONG Yang WANG Qin LI Yu-bin FENG Jun LI Yan-bo CHEN Lie and TANG Xiao-qian |
| |
| Institution: | School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China,Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China,Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China,Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China,Chengdu University of Technology, Chengdu 610059, China,Tibet Institute of Geological Survey, Lhasa 850012, China,Golden Dragon Mining Co., LTD., Lhasa 850000, China,No.5 Geological Party, Tibet Bureau of Geology and Mineral Exploration and Development, Golmud 816000, China,No.5 Geological Party, Tibet Bureau of Geology and Mineral Exploration and Development, Golmud 816000, China and China Mining Federation of Beijing Consulting Center, Beijing 100044, China |
| |
| Abstract: | Dongwodong copper polymetallic deposit is located in the southern margin of Qiangtang terrane, east of Duolong copper gold ore cluster. The study on the timing of alteration and the element migration during the alteration have not been carried out yet. To determine the time of alteration, the 40Ar-39Ar isotopic dating was carried out for altered sericites closely related to the beresitizate mineralization. The results show that the plateau age is 122.20±0.84 Ma, which is consistent with the age (122 Ma) of ore-bearing porphyry. Thus, there is a close link between the mineralization and granodiorite porphyry. Meanwhile, we compared the geochemical results of weakly-altered and mineralized granodiorite, using the isocon equation and the derivation equation to judge the bring-in or bring-out of each element and the element migration during the alteration. Results show that HFSEs are very immobile during the alteration, whereas REEs migrate insignificantly with more obvious migration of LREEs than HREEs. The ore-forming elements (Cu, Pb, Zn) are bring-in elements. The intrusive age of ore-bearing phophyries and the timing of hydrothermal alteration of Dongwodong deposit are consistent with those of other large-superlarge scale copper-gold deposits (Duobuza, Bolong, Tegelongnan) in Duolong copper gold ore cluster, indicating that they were controlled by the same tectonic-magmatic event and thus a great potential of ore-prospecting in Dongwodong mining district can be predicted. |
| |
| Keywords: | sericite 40Ar-39Ar isotopic dating element migration Dongwodong Tibet |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《岩矿测试》浏览原始摘要信息 |
| 点击此处可从《岩矿测试》下载免费的PDF全文 |
|
