吉林大学学报(地球科学版) ›› 2019, Vol. 49 ›› Issue (5): 1338-1349.doi: 10.13278/j.cnki.jjuese.20190092

• 地质与资源 • 上一篇    下一篇

大兴安岭北段索图罕地区碱长花岗岩成因及形成构造背景

杨小鹏1,2, 王长兵3, 李文庆1,4   

  1. 1. 吉林大学地球科学学院, 长春 130061;
    2. 中国地质调查局油气资源调查中心, 北京 100083;
    3. 云南省核工业二○九地质大队, 昆明 650031;
    4. 自然资源部东北亚矿产资源评价重点实验室, 长春 130061
  • 收稿日期:2019-04-18 发布日期:2019-10-10
  • 通讯作者: 李文庆(1985-),男,工程师,博士,主要从事数字地质和地质测试方面的研究,E-mail:lwq@jlu.edu.cn E-mail:lwq@jlu.edu.cn
  • 作者简介:杨小鹏(1993-),男,硕士研究生,主要从事构造地质学和岩石学方面的研究,E-mail:13304336203@163.com
  • 基金资助:
    国家自然科学基金项目(41872234)

Petrogenesis and Tectonic Setting of Moyite in Suotuhan Area, Northern Great Xing'an Range

Yang Xiaopeng1,2, Wang Changbing3, Li Wenqing1,4   

  1. 1. College of Earth Sciences, Jilin University, Changchun 130061, China;
    2. Oil and Gas Survey, China Geological Survey, Beijing 100083, China;
    3. No. 209 Geological Party, Geological Bureau of Yunnan Nuclear Industry, Kuming 650031, China;
    4. Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources, Changchun 130061, China
  • Received:2019-04-18 Published:2019-10-10
  • Supported by:
    Supported by National Natural Science Foundation of China (41872234)

摘要: 本文对大兴安岭北段索图罕地区碱长花岗岩进行了系统的全岩地球化学、锆石U-Pb同位素年代学的研究,并探讨了其成因和构造意义。LA-ICP-MS锆石U-Pb定年结果表明,花岗岩形成于早白垩世,年龄为(139.50±0.56)Ma。岩石地球化学结果显示,索图罕林场碱长花岗岩属于高钾钙碱性的A型花岗岩,岩石具有富硅和碱、贫CaO和MgO的特征,岩石稀土元素质量分数较高,相对富集轻稀土元素,具有明显的负Eu异常,富集Rb、Th、U、K等大离子亲石元素,亏损Nb、P、Ti等高场强元素,稀土元素配分图解具有右斜"V"字形的特征。索图罕林场碱长花岗岩为弱过铝质A型花岗岩,来源于地壳物质的部分熔融。样品微量元素构造判别图解落入后碰撞区域,代表伸展环境。结合区域地质特征,认为该碱长花岗岩的形成与蒙古-鄂霍茨克洋闭合后的岩石圈伸展相关。

关键词: 索图罕地区, 碱长花岗岩, 锆石U-Pb定年, 早白垩世, 伸展环境, 大兴安岭北段

Abstract: In this research, the whole-rock geochemistry and zircon U-Pb isotope chronology of moyite from Suotuhan area in the northern Great Xing'an Range are studied and their petrogenesis and tectonic significance are discussed. The LA-ICP-MS zircon U-Pb dating shows that the moyite formed in the Early Cretaceous with the ages of (139.50±0.56) Ma. The geochemical characteristics suggest that the Suotuhan moyite belongs to high K calcalkaline A type granite, and it is featured by high content of SiO2 and alkaline, and low content of CaO and MgO. The moyite has high rare earth elements (REE), and is relatively rich in LREEs with distinct negative Eu anomalies in chondrite-normalized REE diagram, which is characterized by right oblique and ‘V’-shape. The Suotuhan alkali feldspar granite is a weakly peraluminous A-type granite derived from partial melting of crustal material. The regional geological characteristics indicate that the formation of the moyite was related to lithospheric extension caused by closure of the Mongol-Okhotsk Ocean.

Key words: Suotuhan area, moyite, zircon U-Pb age, Early Cretaceous, extension environment, Northern Great Xing'an Range

中图分类号: 

  • P581
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