Ar-Ar and Zircon SHRIMP Geochronology of Hornblendite and Diorite in Northern Darhan Muminggan Joint Banner,
详细信息
- 责任者：Li Jianfeng (MOE Key Laboratory of Orogenic Belts and Crustal Evolution ; School of Earth and Space Sciences ; Peking University ; Beijing 100871 ; China) ; Zhang Zhicheng
- 刊名：Acta Petrologica et Mineralogica
- 出版年：2010
- 卷期：29(6)
- 关键词：闪长岩 ; diorites ; 铀—铅计时 ; U-Pb dating ; 氩—氩计时 ; Ar-Ar dating ; 内蒙古 ; Inner Mongolia
- 页码：p.732-740
- 图表：4 illus., 2 tables, 20 refs.
- 分类号：0801
- issnNo：ISSN1000-6524
- isbnNo：CN11-1966/P
摘要
The northern Darhan Muminggan Joint Banner of Inner Mongolia, geotectonically crossing two geological-structural units, is divided into two parts by Bayan Obo-Chifeng deep fault (plate boundary fault). In this paper, precise SHRIMP zircon U-Pb dating and hornblende 40Ar/39Ar dating defining the emplacement age of the intrusion and its thermal evolution history were conducted for inclusions of diorite and hornblendite hosted in granodiorite, and the constraints on Early Paleozoic subduction-collision event of the Paleo-Asian Ocean in central Inner Mongolia were provided from isotope geochronology. The results of SHRIMP zircon U-Pb dating are basically in accordance with those of hornblende conventional 40Ar/39Ar dating method, which suggests the crystallization and rapid cooling after the emplacement of the magma and may reveal collision between the Baoerhantu-Bainaimiao island arc zone and the North China plate.
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