吉林大学学报(地球科学版) ›› 2016, Vol. 46 ›› Issue (6): 1769-1780.doi: 10.13278/j.cnki.jjuese.201606114

• 地质与资源 • 上一篇    下一篇

内蒙古索伦地区上二叠统林西组碎屑岩地球化学特征及其对物源的指示意义

李福来1,2, 肖飞3, 孟凡超1,2, 任泽樱4   

  1. 1. 中国石油大学(华东)地球科学与技术学院, 山东 青岛 266580;
    2. 海洋国家实验室海洋矿产资源评价与探测技术功能实验室, 山东 青岛 266071;
    3. 中国地质大学(北京)能源学院, 北京 100083;
    4. 胜利油田东胜精攻石油开发集团股份有限公司, 山东 东营 257000
  • 收稿日期:2016-05-15 出版日期:2016-11-26 发布日期:2016-11-26
  • 作者简介:李福来(1978),男,讲师,博士,主要从事油气地质及勘探研究,E-mail:liful@upc.edu.cn
  • 基金资助:
    国家自然科学基金项目（41202075）；中央高校基本科研业务费专项（15CX05007A）

Geochemical Characteristics and Implication for Provenance of Upper Permian Linxi Formation Clastic Rocks in Solonker Area, Inner Mongolia

Li Fulai1,2, Xiao Fei3, Meng Fanchao1,2, Ren Zeying4   

  1. 1. College of Geosciences, China University of Petroleum(East China), Qingdao 266580, Shandong, China;
    2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, Shandong, China;
    3. School of Energy Resources, China University of Geosciences, Beijing 100083, China;
    4. Dongsheng Group CO. LTD. of Shengli Oilfield, Dongying 257000, Shandong, China
  • Received:2016-05-15 Online:2016-11-26 Published:2016-11-26
  • Supported by:
    Supported by National Natural Science Foundation of China(41202075) and Fundamental Research Funds for the Central Universities(15CX05007A)

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摘要： 内蒙古索伦地区上二叠统林西组沉积物源受控于晚古生代古亚洲洋的闭合事件。本文通过分析碎屑岩元素地球化学特征，对林西组母岩类型和古构造环境进行了探讨。常量元素分布特征表明，林西组早期属于风化程度较弱的第一次旋回沉积物，后期属于中等风化的第一次旋回沉积或再旋回沉积物，母岩类型以火成岩为主；微量元素和稀土元素分布特征表明，林西组母岩沉积环境为大陆岛弧背景下切割的岩浆弧，以上地壳碱性-中性火成岩为主，伴有钙质-泥质沉积岩，（Gd/Yb）n表明早期沉积母岩为太古宙碱性火成岩。综合分析表明，林西组沉积同时接受南侧华北板块北缘和北侧苏尼特左旗—锡林浩特—西乌旗南岩浆弧的共同物源供给，早期沉积有华北板块北缘太古宙基底母岩的参与。

关键词: 地球化学, 沉积物源, 构造背景, 林西组, 索伦地区

Abstract: The provenanceof the Linxi Formation in Solonker area was greatly influenced by the closure of the Paleo-Asian Ocean occurred in the Late Paleozoic. A comprehensive analysis of the element geochemical characteristics of the clastic rock has been done to study the source rock types and the tectonic setting of the Linxi Formation in the Solonker area. The major elements compositions indicated that the early sediments was of low weathering degree from the first depositional cycle and the latter sediments was of moderate weathering degree from the first depositional cycle or recycled deposition, and the igneous rock was the primary source rock. The trace elements and rare earth elements characteristics demonstrated a dissected magmatic arc dominated tectonic setting for the source rock of Linxi Formation. The intermediate and alkaline igneous rocks from the upper crust were the primary source rocks, with lower content of sedimentary rock. The indicator (Gd/Yb)n showed the early sediments was from the Archean alkaline igneous rocks. Comprehensive analysis showed that the provenances of the Linxi Formation were jointly derived from the north margin of the North China plate in the south and the Sonid Zuoqi-Xilinhot-sourthern Xiwuqi magma arc in the north.

Key words: geochemical, provenance, tectonic setting, Linxi Formation, Solonker area

中图分类号: 

  • P588.21
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