Geochemistry and SHRIMP U-Pb Dating of the Guangxingyuan Composite Pluton in Hexigten Qi, Inner Mongolia and Its Geological Implication
详细信息
- 责任者：Jiang Xiaojun (Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Liu Yongqing
- 刊名：Acta Geologica Sinica
- 出版年：2011
- 卷期：85(1)
- 关键词：侵入体 ; intrusions ; 铀—铅计时 ; U-Pb dating ; 内蒙古 ; Inner Mongolia
- 页码：p.114-128
- 图表：10 illus., 4 tables, 79 refs.
- 分类号：0801
- 出版序号：20120141
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
The Guangxingyuan composite pluton is located at the upper reaches of Xar Moron River, Inner Mongolia. It is composed mainly of monzonite, monzogranite,granite,and granodiorite with minor amount of monzogabbro and diorite exposed at edges. Its geochemistry is characterized by the typical volcanic-magmatic arc environment. High-precision SHRIMP U-Pb zircon dating was carried out on early monzonite and granodiorite intruding the monzonite, and yielded 206Pb/238U weighted mean ages of 263.8±2.1 Ma and 263.3±2.5 Ma, respectively, suggesting a Mid-Late Permian age. These data demonstrate that the southeastern margin of the Paleo-Asian Ocean crust subducted southward beneath North China Craton during the Mid-Late Permian, resulting in a volcanic-magmatic arc environment at the northern margin of North China Craton, which was followed by collisional orogensis between the northern paleo-North China plate’s margin and southern Siberia Craton in Mid-Early Triassic.
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