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现代地质 ›› 2023, Vol. 37 ›› Issue (02): 419-432.DOI: 10.19657/j.geoscience.1000-8527.2021.148

• 岩石学 • 上一篇    下一篇

内蒙古艾力格庙地区卫境岩体的地球化学特征及其构造意义

刘金宝1,2(), 朱洛婷3, 李龙雪4, 侯青叶4   

  1. 1.内蒙古自治区岩浆活动成矿与找矿重点实验室,内蒙古 呼和浩特 010020
    2.内蒙古自治区地质调查研究院,内蒙古 呼和浩特 010020
    3.安徽省自然资源厅,安徽 合肥 230031
    4.中国地质大学(北京)地球科学与资源学院,北京 100083
  • 收稿日期:2022-05-06 修回日期:2022-10-11 出版日期:2023-04-10 发布日期:2023-05-23
  • 作者简介:刘金宝,男,高级工程师,1968年出生,地球化学与勘查专业,从事金属矿产、环境、农业生态等的地球化学勘查工作。Email: nmgljb@126.com
  • 基金资助:
    国土资源公益性行业科研专项“地壳深部物质成分识别技术”(201011054);国土资源公益性行业科研专项“地壳深部物质成分识别技术”(201311168)

Geochemistry and Tectonic Significance of the Weijing Pluton in Airgin Sum Area, Inner Mongolia

LIU Jinbao1,2(), ZHU Luoting3, LI Longxue4, HOU Qingye4   

  1. 1. Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-Prospecting, Hohhot, Inner Mongolia 010020, China
    2. Geological Survey and Research Institute of Inner Mongolia, Hohhot, Inner Mongolia 010020, China
    3. Department of Natural Resources of Anhui Province, Hefei, Anhui 230031, China
    4. School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
  • Received:2022-05-06 Revised:2022-10-11 Online:2023-04-10 Published:2023-05-23

摘要:

艾力格庙地区位于索伦山—西拉木伦古生代结合带北部,是研究兴蒙造山带的重要地区之一。前人主要针对该区古生代的构造演化、岩浆岩及沉积岩开展了大量研究,很少针对早中生代岩浆岩开展相关研究工作。本次研究选择卫境岩体开展了详细的岩石学、年代学和地球化学研究。结果表明卫境钾长花岗岩形成于早白垩世(144.7 Ma),岩石属于准铝质高钾钙碱性;富硅富碱,相对富铁贫镁,钙铝偏低;具有较低的(87Sr/86Sr)i值,较高的εNd(t)和εHf(t)值,具有A型花岗岩的地球化学特征。其源区主要为来自亏损地幔新增生的地壳物质,形成于板内伸展构造环境。

关键词: 钾长花岗岩, 地球化学, 年代学, 卫境岩体, 艾力格庙, 内蒙古

Abstract:

Airgin Sum area is located in north of the Paleozoic Solonker-Xar Moron suture zone, and is a key region for studying the Xing-Meng orogenic belt. Many previous studies were focused on the Paleozoic tectonic evolution, magmatic rocks and sedimentary rocks. However, few studies were dedicated to the Early Mesozoic magmatic rocks. In this study, the Weijing pluton was selected for detailed petrological, geochemical and geochronological analyses. The results show that the Weijing moyite was formed in the Early Cretaceous (144.7 Ma). The moyite is subalkaline metaluminous, high-K calc alkaline, rich in Si and alkali, relatively rich in Fe but poor in Mg, Ca, and Al, showing A-type granite geochemical characteristics. The low (87Sr/86Sr)i but, high εNd(t) and εHf(t) values of the Weijing moyite indicate that it was derived mainly from the juvenile accreted crust from the depleted mantle. The Weijing moyite was likely formed in an intraplate extensional environment.

Key words: moyite, geochemistry, geochronology, Weijing pluton, Airgin Sum, Inner Mongolia

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