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	Late paleozoic subduction of the paleo-asian ocean: geochronological and geochemical records from qianshan mafic intrusion in hunchun area, ne china
	Li HongXia1,2; Guo Feng1; Li ChaoWen1; Zhao Liang1,2
刊名	Acta petrologica sinica
	2010-05-01
卷号	26期号:5页码:1530-1540
关键词	Paleo-asian oceanic subduction Mafic intrusion Early permian Ne china
ISSN号	1000-0569
通讯作者	Li hongxia()
英文摘要	Mafic magmatism occurring at qianshan in the hunchun area of eastern jilin province, ne china, comprises a wide spectrum of rock types from olivine gabbro, norite to gabbroic diorite. zircon u-pb dating results on a gabbroic diorite indicate an early permian emplacement age (273 +/- 2ma, n =12, mswd = 1.6). these rocks show typical geochemical characteristics to arc tholeiitic basalt, e. g., enrichments in liles (ba and sr) and lrees but depletion in hfses (nb, ta, zr and hf), with la/nb range of 2. 8 similar to 4.8 and zr/sm range of 8.0 similar to 22.5. they also have depleted sr-nd-hf isotopic features, spanning an (87)sr/(86)sr((i)) range of 0. 70295 similar to 0.70375, an epsilon(nd)(t) range of +4. 5 similar to +6. 4, and an epsilon(hf)(t) range of +9. 6 similar to +14. 6, suggesting their derivation from an isotopically depleted mantle reservoir. combined major, trace element and sr-nd-hf isotope data suggest that the primary magma was derived from a metasomatized mantle wedge, predominantly modified by fluid released from the subducted sediments. this magma then experienced fractional crystallization of olivine and clinopyroxene to form the wide spectrum of rock types. generation of qianshan mafic intrusions was genetically associated with subduction of the paleo-asian oceanic slab. our new results indicate that the existence of the paleo-asian ocean lasted even to tile end of paleozoic in the eastern segment of the central asian orogenic belt.
WOS关键词	HIGH-MG ANDESITES ; VOLCANIC-ROCKS ; NORTHEAST CHINA ; INNER-MONGOLIA ; TECTONIC IMPLICATIONS ; OROGENIC BELT ; JILIN PROVINCE ; YANJI AREA ; PETROGENESIS ; MANTLE
WOS研究方向	Geology
WOS类目	Geology
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000278597800018
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2409659
专题	中国科学院大学
通讯作者	Li HongXia
作者单位	1.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Marginal Sea Geol, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Li HongXia,Guo Feng,Li ChaoWen,et al. Late paleozoic subduction of the paleo-asian ocean: geochronological and geochemical records from qianshan mafic intrusion in hunchun area, ne china[J]. Acta petrologica sinica,2010,26(5):1530-1540.
APA	Li HongXia,Guo Feng,Li ChaoWen,&Zhao Liang.(2010).Late paleozoic subduction of the paleo-asian ocean: geochronological and geochemical records from qianshan mafic intrusion in hunchun area, ne china.Acta petrologica sinica,26(5),1530-1540.
MLA	Li HongXia,et al."Late paleozoic subduction of the paleo-asian ocean: geochronological and geochemical records from qianshan mafic intrusion in hunchun area, ne china".Acta petrologica sinica 26.5(2010):1530-1540.

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