Transformation from Paleo-Asian Ocean closure to Paleo-Pacific   subduction: New constraints from granitoids in the eastern   Jilin-Heilongjiang Belt, NE China

doi:10.1016/j.jseaes.2016.11.003

CORC > 北京大学 > 地球与空间科学学院

	Transformation from Paleo-Asian Ocean closure to Paleo-Pacific subduction: New constraints from granitoids in the eastern Jilin-Heilongjiang Belt, NE China
	Ma, Xing-Hua ; Zhu, Wen -Ping ; Zhou, Zhen-Hua ; Qiao, Shi-Lei
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2017
关键词	Granitoids Zircon U-Pb geochronology Tectonic regime NE China U-PB AGES PHANEROZOIC CRUSTAL GROWTH ND ISOTOPIC EVIDENCE PORPHYRY MO DEPOSIT HIGH-MG DIORITES TECTONIC IMPLICATIONS NORTHEASTERN CHINA OROGENIC BELT JIAMUSI MASSIF INNER-MONGOLIA
DOI	10.1016/j.jseaes.2016.11.003
英文摘要	The eastern Jilin-Heilongjiang Belt (EJHB) of NE China is a unique orogen that underwent two stages of evolution within the tectonic regimes of the Paleo-Asian and Paleo-Pacific oceans. 158 available zircon U-Pb ages, including 26 ages obtained during the present study and 132 ages from the literature, were compiled and analyzed for the Mesozoic and Cenozoic granitoids from the EJHB and the adjacent Russian Sikhote-Alin Orogenic Belt (SAOB), to examine the temporal-spatial distribution of the granitoids and to constrain the tectonic evolution of the East Asian continental margin. Five stages of granitic magmatism can be identified: Early Triassic (251-240 Ma), Late Triassic (228-215 Ma), latest Triassic to Middle Jurassic (213-158 Ma), Early Cretaceous (131-105 Ma), and Late Cretaceous to Paleocene (95-56 Ma). The Early Triassic granitoids are restricted to the Yanbian region along the Changchun-Yanji Suture, and show geochemical characteristics of magmas from a thickened lower crust source, probably due to the final collision of the combined NE China blocks with the North China Craton. The Late Triassic granitoids, with features of A-type granites, represent post-collisional magmatic activities that were related to post-orogenic extension, marking the end of the tectonic evolution of the Paleo-Asian Ocean. The latest Triassic to Paleocene granitoids with calc-alkaline characteristics were NE-trending emplaced along the EJHB and SAOB and young towards the coastal region, and represent continental marginal arc magmas that were associated with the northwestwards subduction of the Paleo-Pacific Plate. Two periods of magmatic quiescence (158-131 and 105-95 Ma) correspond to changes in the subduction direction of the Paleo-Pacific Plate from oblique relative to the continental margin to subparallel. Taking all this into account, we conclude that: (1) the final closure of the Paleo-Asian Ocean occurred along the Changchun-Yanji Suture during the Early Triassic; (2) the onset of the subduction of the Paleo-Pacific Plate beneath the East Asian continental margin probably took place during the latest Triassic (ca. 215 Ma); (3) changes in the drifting direction of the Paleo-Pacific Plate were responsible for the intermittent magmatic activities; and (4) roll-back of the subducted plate resulted in the oceanwards migration of the magmatic arc and large-scale back-arc extension throughout NE China during the Early Cretaceous. (c) 2016 Elsevier Ltd. All rights reserved.; State Key Basic Research and Development Program of China [2013CB429804]; Fundamental Research Funds for the Central Public Welfare Research Institutes of China [K1502, K1314, K1414]; National Science Foundation of China [41572054, 41403042, 41302061]; SCI(E); ARTICLE; ,SI; 261-286; 144
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/471485]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Ma, Xing-Hua,Zhu, Wen -Ping,Zhou, Zhen-Hua,et al. Transformation from Paleo-Asian Ocean closure to Paleo-Pacific subduction: New constraints from granitoids in the eastern Jilin-Heilongjiang Belt, NE China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2017.
APA	Ma, Xing-Hua,Zhu, Wen -Ping,Zhou, Zhen-Hua,&Qiao, Shi-Lei.(2017).Transformation from Paleo-Asian Ocean closure to Paleo-Pacific subduction: New constraints from granitoids in the eastern Jilin-Heilongjiang Belt, NE China.JOURNAL OF ASIAN EARTH SCIENCES.
MLA	Ma, Xing-Hua,et al."Transformation from Paleo-Asian Ocean closure to Paleo-Pacific subduction: New constraints from granitoids in the eastern Jilin-Heilongjiang Belt, NE China".JOURNAL OF ASIAN EARTH SCIENCES (2017).