Switch of geodynamic setting from the Paleo-Asian Ocean to the Mongol-Okhotsk Ocean: Evidence from granitoids in the Duobaoshan ore field, Heilongjiang Province, Northeast China

doi:10.1016/j.lithos.2019.04.006

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院矿产资源研究重点实验室

	Switch of geodynamic setting from the Paleo-Asian Ocean to the Mongol-Okhotsk Ocean: Evidence from granitoids in the Duobaoshan ore field, Heilongjiang Province, Northeast China
	Zhao, Chao 1,2,3; Qin, Ke-Zhang 1,2,3; Song, Guo-Xue 3; Li, Guang-Ming 1,2
刊名	LITHOS
	2019-07-01
卷号	336 页码:202-220
关键词	Paleo-Asian Ocean Mongol-Okhotsk Ocean Tectonic switch Duobaoshan ore field Triassic granitoids Eastern CAOB
ISSN号	0024-4937
DOI	10.1016/j.lithos.2019.04.006
英文摘要	This paper presents new zircon U-Pb ages and whole-rock geochemical data for Triassic granitoids in the Duobaoshan ore field, in the eastern Central Asian Orogenic Belt (CAOB). Dating results reveal that the Triassic granitoids in the Duobaoshan ore field were emplaced ca. 244-223 Ma. These samples are typical subduction-related arc magmatic rocks that are enriched with large-ion lithophile elements (LILEs), depleted in high field strength elements (HFSEs), and have relatively high Sr (average 1036 ppm) and low Y (average 10 ppm) and Yb (average 1 ppm) contents that exhibit adakite-like geochemical properties. The samples feature a juvenile whole rock average initial Sr-87/ Sr-86 ratio of 0.70394 and an average epsilon(Nd) (t), zircon epsilon(Hf) (t), and two-stage Hf model age of 4.62, 10.29, and 766 Ma respectively. These geochemical features reveal a thickened lower crust source. Comprehensive analyses of the early Paleozoic, Triassic, and early Jurassic granitoids in the Duobaoshan ore field indicate that the magmatism of these three stages was related to the melting of the juvenile lower continental crust materials. The early Paleozoic was the primary period of vertical crust growth, during which time the juvenile lower continental crust was formed. The Triassic granitoids derived from magma were generated by partial melting of the thickened juvenile lower crust and the Jurassic granitoids derived from the partial melting of the delaminated juvenile lower crust. Geological observation and tectonic setting analyses reveal that the Paleo-Asian Ocean tectonic regime in the Duobaoshan ore field switched to the Mongol-Okhotsk Ocean in the Mesozoic after its closure. The early Paleozoic granitoids were formed in a subduction setting related to the northwestward subducted Paleo-Asian Oceanic slab underlying the Erguna-Xing'an composite block. The Triassic granitoids were formed under a supra-subduction extensional regime related to the southward subduction of the Mongol-Okhotsk Ocean, and the Jurassic granitoids were generated under a slab rollback setting related to the late stage subduction of the Mongol-Okhotsk Ocean. (C) 2019 Elsevier B.V. All rights reserved.
资助项目	National Key Research and Development Program of China[2017YFC0601306] ; National Natural Science Foundation of China[41390444] ; National Natural Science Foundation of China[41672090] ; National Natural Science Foundation of China[41572064] ; Heilongjiang Duobaoshan Copper Industry Co., Ltd.
WOS关键词	PORPHYRY COPPER-DEPOSIT ; GREAT XINGAN RANGE ; I-TYPE GRANITES ; U-PB AGES ; NE CHINA ; OROGENIC BELT ; IGNEOUS ROCKS ; LU-HF ; ISOTOPE SYSTEMATICS ; INTRUSIVE ROCKS
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000470043100014
资助机构	National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Heilongjiang Duobaoshan Copper Industry Co., Ltd. ; Heilongjiang Duobaoshan Copper Industry Co., Ltd. ; Heilongjiang Duobaoshan Copper Industry Co., Ltd. ; Heilongjiang Duobaoshan Copper Industry Co., Ltd. ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Heilongjiang Duobaoshan Copper Industry Co., Ltd. ; Heilongjiang Duobaoshan Copper Industry Co., Ltd. ; Heilongjiang Duobaoshan Copper Industry Co., Ltd. ; Heilongjiang Duobaoshan Copper Industry Co., Ltd. ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Heilongjiang Duobaoshan Copper Industry Co., Ltd. ; Heilongjiang Duobaoshan Copper Industry Co., Ltd. ; Heilongjiang Duobaoshan Copper Industry Co., Ltd. ; Heilongjiang Duobaoshan Copper Industry Co., Ltd. ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Heilongjiang Duobaoshan Copper Industry Co., Ltd. ; Heilongjiang Duobaoshan Copper Industry Co., Ltd. ; Heilongjiang Duobaoshan Copper Industry Co., Ltd. ; Heilongjiang Duobaoshan Copper Industry Co., Ltd.
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/92282]
专题	地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者	Qin, Ke-Zhang
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, POB 9825, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Chao,Qin, Ke-Zhang,Song, Guo-Xue,et al. Switch of geodynamic setting from the Paleo-Asian Ocean to the Mongol-Okhotsk Ocean: Evidence from granitoids in the Duobaoshan ore field, Heilongjiang Province, Northeast China[J]. LITHOS,2019,336:202-220.
APA	Zhao, Chao,Qin, Ke-Zhang,Song, Guo-Xue,&Li, Guang-Ming.(2019).Switch of geodynamic setting from the Paleo-Asian Ocean to the Mongol-Okhotsk Ocean: Evidence from granitoids in the Duobaoshan ore field, Heilongjiang Province, Northeast China.LITHOS,336,202-220.
MLA	Zhao, Chao,et al."Switch of geodynamic setting from the Paleo-Asian Ocean to the Mongol-Okhotsk Ocean: Evidence from granitoids in the Duobaoshan ore field, Heilongjiang Province, Northeast China".LITHOS 336(2019):202-220.