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Alaskan-type Kedanshan intrusion (central Inner Mongolia, China): Superimposed subduction between the Mongol-Okhotsk and Paleo-Pacific oceans in the Jurassic

文献类型：期刊论文

作者Dong, Jinlong1; Song, Shuguang1; Wang, Mingming1; Allen, Mark B.2; Su, Li3; Wang, Chao1; Yang, Liming1; Xu, Bei1
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2018-11-01
卷号167页码:68-81
ISSN号1367-9120
关键词Alaskan-type ultramafic-mafic intrusion Jurassic Superimposed subduction Mongol-Okhotsk Ocean Paleo-Pacific Ocean
DOI10.1016/j.jseaes.2017.11.010
英文摘要The Xing'an-Inner Mongolia accretionary belt in the eastern Central Asian Orogenic Belt (CAOB) was produced by the subduction of three oceanic plates: the Paleo-Asian, Mongol-Okhotsk and Paleo-Pacific oceanic plates. The interactions between these plates remain unclear. Here we report an Alaskan-type ultramafic-mafic intrusion in the Kedanshan area, central Inner Mongolia, China. The main lithologies of this intrusion include cumulate dunite, pyroxene peridotite, olivine pyroxenite and cumulate gabbro, with late gabbroic/anorthositic dykes. Minerals and whole-rock compositional variations display characteristics of an arc cumulate trend (Alaskan type), through fractional crystallization of Mg-rich and hydrous basaltic magma associated with oceanic subduction. Zircons from two gabbro samples yield Early Jurassic ages of 193 +/- 6 Ma and 179 +/- 4 Ma, respectively. We conclude that this ultramafic-mafic complex is an accumulated intrusion from an arc-related, high-Mg magma chamber above a supra-subduction zone. Considering the ages, location and tectonic setting of the complex, we suggest that it was most likely generated by melting of a large and triangle-shaped mantle wedge during superimposed subduction between the Mongol-Okhotsk and the Paleo-Pacific oceanic plates in the Jurassic.
WOS关键词CALC-ALKALINE DIFFERENTIATION ; DAXINGANLING OROGENIC BELT ; MAFIC-ULTRAMAFIC COMPLEXES ; NE CHINA ; TECTONIC EVOLUTION ; EASTERN DESERT ; NORTH CHINA ; CHROMIAN SPINEL ; GABBRO AKAREM ; ISLAND-ARC
资助项目National Key Basic Research Program of China[2013CB429806] ; National Natural Science Foundation of China[41572040] ; National Natural Science Foundation of China[41372060]
WOS研究方向Geology
语种英语
出版者PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号WOS:000451492800006
资助机构National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Basic Research Program of China ; National Key Basic Research Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/89605]  
专题地质与地球物理研究所_其他部门
通讯作者Song, Shuguang
作者单位1.Peking Univ, Sch Earth & Space Sci, MOE Key Lab Orogen Belts & Crustal Evolut, Beijing, Peoples R China
2.Univ Durham, Dept Earth Sci, Durham, England
3.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Dong, Jinlong,Song, Shuguang,Wang, Mingming,et al. Alaskan-type Kedanshan intrusion (central Inner Mongolia, China): Superimposed subduction between the Mongol-Okhotsk and Paleo-Pacific oceans in the Jurassic[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,167:68-81.
APA Dong, Jinlong.,Song, Shuguang.,Wang, Mingming.,Allen, Mark B..,Su, Li.,...&Xu, Bei.(2018).Alaskan-type Kedanshan intrusion (central Inner Mongolia, China): Superimposed subduction between the Mongol-Okhotsk and Paleo-Pacific oceans in the Jurassic.JOURNAL OF ASIAN EARTH SCIENCES,167,68-81.
MLA Dong, Jinlong,et al."Alaskan-type Kedanshan intrusion (central Inner Mongolia, China): Superimposed subduction between the Mongol-Okhotsk and Paleo-Pacific oceans in the Jurassic".JOURNAL OF ASIAN EARTH SCIENCES 167(2018):68-81.

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来源：地质与地球物理研究所

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