吉林大学学报(地球科学版) ›› 2019, Vol. 49 ›› Issue (6): 1628-1648.doi: 10.13278/j.cnki.jjuese.20190068

• 地质与资源 • 上一篇    下一篇

东昆仑五龙沟矿集区中三叠世辉绿岩脉的岩石成因:年代学、地球化学特征及其构造意义

程龙1, 丁清峰1, 邓元良2, 宋凯1, 张强1   

  1. 1. 吉林大学地球科学学院, 长春 130061;
    2. 青海省第六地质勘察院, 青海 海西 810001
  • 收稿日期:2019-04-02 发布日期:2019-11-30
  • 通讯作者: 丁清峰(1976-),男,教授,博士,主要从事矿床学方面的研究和教学工作,E-mail:dingqf@jlu.edu.cn E-mail:dingqf@jlu.edu.cn
  • 作者简介:程龙(1991-),男,研究生,主要从事矿产普查与勘探(固体方向)方向的研究,E-mail:773710523@qq.com
  • 基金资助:
    国家自然科学基金项目（41572056）

Petrogenesis of Middle Triassic Diabase Veins in Wulonggou Ore Concentrated Areas Within East Kunlun Orogen: Chronology, Geochemistry and Tectonic Significance

Cheng Long1, Ding Qingfeng1, Deng Yuanliang2, Song Kai1, Zhang Qiang1   

  1. 1. College of Earth Sciences, Jilin University, Changchun 130061, China;
    2. Qinghai Sixth Geological Exploration Istitute, Haixi 810001, Qinghai, China
  • Received:2019-04-02 Published:2019-11-30
  • Supported by:
    Supported by National Natural Science Foundation of China (41572056)

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摘要： 本文对五龙沟矿集区4条辉绿岩脉中的锆石进行LA-ICP-MS U-Pb定年研究，发现其中大部分锆石为捕获锆石，而拥有最新年龄的锆石可代表岩浆结晶时的锆石，其加权平均年龄为（242.8±2.1）Ma，属于中三叠世。这些辉绿岩脉的w（SiO2）为42.82%~52.94%，w（Na2O）为1.98%~4.51%，w（K2O）为0.70%~2.04%，属于钙碱性和高钙碱性系列；4条岩脉中V、Cr、Ni等质量分数与MgO质量分数均呈正相关，且质量分数较小，表明其岩浆演化过程中经历了以橄榄石、辉石为主的分离结晶作用；其微量元素具有相对富集大离子亲石元素（Rb、Ba、Eu）和轻稀土元素，亏损高场强元素的特征，Nb/La为0.39~0.50，Nb/Ta为12.16~16.69，Zr/Hf为45.82~47.06，明显和亏损软流圈地幔来源的岩浆不同。综合分析认为，五龙沟矿集区的中三叠世辉绿岩脉大地构造背景为俯冲环境，是受俯冲板片流体改造的岩石圈地幔部分熔融的产物，并经受了一定的地壳混染。

关键词: 五龙沟矿集区, 辉绿岩脉, 中三叠世, 年代学, 地球化学, 岩石圈

Abstract: Through a LA-ICP-MS U-Pb dating of zircons from four diabase dykes in Wulonggou ore concentrated areas, we found that the most zircons are the inherited zircons. The zircons with the latest age represent those from the magmatic crystallization of diabase veins with an average age of (242.8±2.1) Ma (the Middle Triassic). The four diabase dykes are calc-alkaline -high calc-alkaline with w(SiO2) range of 42.82%-52.94%,w(Na2O) range of 1.98%-4.51% and w(K2O) range of 0.70%-2.04%. V, Cr, Ni and the other trace elements in the four dikes are positively correlated with MgO mass fraction, and the mass fraction is small. This results indicate that the fractional crystallizations of the olivine and pyroxene occurred during the magmatic process. The trace elements are characterized by relatively rich in LILE (Rb, Ba, Eu), LREE, depleted of HFSE, Nb/La is 0.39-0.50, Nb/Ta is 12.16-16.69, and Zr/Hf is 45.82-47.06. These features are quite different from those of the magma derived from the depleted asthenosphere mantle. In conclusion, the Middle Triassic diabase dikes in Wulonggou ore concentrated areas may be derived from the partial melting of the lithospheric mantle, reconstructed by the subduction plate fluids and contaminated by the crust.

Key words: Wulonggou ore concentrated areas, diabase dykes, Middle Triassic, chronology, geochemistry, lithospheric

中图分类号: 

  • P588.124
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