陕南铜厂闪长岩体的成岩、成矿时代及其地质意义

北京大学学报（自然科学版）

陕南铜厂闪长岩体的成岩、成矿时代及其地质意义

王伟¹,刘树文¹,吴峰辉¹,李秋根¹,王宗起²,杨凯³,闫全人²,王瑞廷⁴,杨鹏涛¹

1. 造山带与地壳演化教育部重点实验室,北京大学地球与空间科学学院,北京 100871; 2. 中国地质科学院地质研究所, 北京 100037; 3. 中国煤炭地质工程总公司,北京 100073; 4. 西北有色地质勘查局地质勘察院, 西安 710054;

收稿日期:2010-01-09 出版日期:2011-01-20 发布日期:2011-01-20

Emplaced and Metallogenetic Times of Tongchang Diorities, Southern Shaanxi Province and Its Geological Implications

WANG Wei¹, LIU Shuwen¹, WU Fenghui¹, LI Qiugen¹, WANG Zongqi², YANG Kai², YAN Quanren², WANG Ruiting, YANG Pengtao¹

1. The Key Laboratory of Orogenic Belt and Crustal Evolution MOE , School of Earth and Space Sciences, Peking University, Beijing 100871; 2. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037; 3. China Coal Geological Engineering Corporation, Beijing 100073; 4. Geological Exploration Institution of Northwest Mining and Geological Exploration Bureau for Nonferrous Metals, Xi'an 710054;

Received:2010-01-09 Online:2011-01-20 Published:2011-01-20

摘要/Abstract

摘要： 铜厂闪长岩体位于扬子地台北缘勉县-略阳-阳平关三角地块区域内, 主要由闪长岩、石英闪长岩和花岗闪长岩组成。LA-ICPMS 和 SHRIMP 锆石U-Pb 同位素定年结果表明铜厂闪长岩体存在 3 个侵位结晶阶段: 早期阶段的闪长岩形成于 879 ±7 Ma; 中期阶段的石英闪长岩形成于 848±5 ～840±7 Ma, 含矿钠长岩脉于 834±7 Ma侵位结晶, 与中期阶段石英闪长岩侵位时代在误差范围内一致; 晚期阶段花岗闪长岩形成于 824±5 Ma。这些新的年代学数据表明铜厂闪长岩体及其相伴生的大型铜厂铜矿形成于晋宁期, 而不是古生代, 揭示了扬子地台北缘存在重要的新元古代早期岩浆活动, 与 Rodinia 超大陆的裂解事件在时间上( 860 ～750 Ma) 基本一致, 是Rodinia 超大陆事件在扬子地台北缘的重要响应。

关键词: 铜厂闪长岩体, 铜厂铜矿, 锆石U-Pb年龄, 扬子地台北缘, Rodinia超大陆

Abstract: Tongchang dioritic pluton in Southern Shaanxi Province is located in the tectonic domain of the Mianxian-Lueyang-Yangpingguan triangle block, northern margin of Yangzi Craton, and consists mainly of diorite, quartzdiorite and granodiorite. Zircon grains separated from these rocks are dated using LA-ICPMS and SHRIMP U-Pb isotopic methods. The dating results indicate three intrusive stages of the Tongchang dioritic pluton, and early diorite emplaced at 879±7 Ma; middle quartz diorite at 848±5 Ma to 840 ±7 Ma, with copper ore-bearing albitite emplced at 834±7 Ma, which is consistent with the crystallization age of quartz diorite within error range, and the last granodiorite at 824±5 Ma. These zircon U-Pb isotopic dating results reveal that the emplacements of the Tongchang diorites and related copper deposit did not occur in Paleozoic but in Jinning stage of Neoproterozoic era. The magmatic activity and related copper deposit mineralization are important responses to the breakup event of global Rodinia supercontinent( 860-750 Ma).

Key words: Tongchang diorites, Tongchang copper deposit, zircon U-Pb ages, northern margin of Yangzi Craton, Rodinia supercontinent

中图分类号:

P597
P611

王伟,刘树文,吴峰辉,李秋根,王宗起,杨凯,闫全人,王瑞廷,杨鹏涛. 陕南铜厂闪长岩体的成岩、成矿时代及其地质意义[J]. 北京大学学报（自然科学版）.

WANG Wei,LIU Shuwen,WU Fenghui,LI Qiugen,WANG Zongqi,YANG Kai,YAN Quanren,WANG Ruiting,YANG Pengtao. Emplaced and Metallogenetic Times of Tongchang Diorities, Southern Shaanxi Province and Its Geological Implications[J]. Acta Scientiarum Naturalium Universitatis Pekinensis.

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链接本文: https://xbna.pku.edu.cn/CN/

https://xbna.pku.edu.cn/CN/Y2011/V47/I1/91

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