Late Cretaceous tectonics and magmatism in Gangdese batholith, Southern Tibet: A record from the mafic-dioritic dike swarms within the Baidui Complex

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 > 岩石圈演化国家重点实验室

	Late Cretaceous tectonics and magmatism in Gangdese batholith, Southern Tibet: A record from the mafic-dioritic dike swarms within the Baidui Complex
	Gao JiaHao 1; Zeng LingSen 1; Guo ChunLi 2; Li QiuLi 3; Wang YaYing 1
刊名	ACTA PETROLOGICA SINICA
	2017
卷号	33 期号:8 页码:2412-2436
关键词	Gangdese batholith Baidui complex Arc magmatism Extension Oblique subduction
ISSN号	1000-0569
文献子类	Article
英文摘要	A series of sub-parallel, W-E trending dikes of mafic to dioritic compositions (the Baidui dike swarms) intruded into the Baidui granodiorite complex and collectively form a 'bar code'-like structure. Zircon U-Pb dating indicates these dikes formed at a time of period of 85 similar to 68Ma. Irrespective of their major element compositions, they all are characterized by enrichment in LILE and LREE, depletion in HREE and HFSE, and no Eu anomalies, similarity low Sr (Sr-87/Sr-86((t)) <0. 7041) but high Nd (epsilon(Nd)(t) > +3. 1) and zircon Hf (epsilon(Hf) (t) > + 10. 7) isotope compositions. As compared those in the dioritic dikes, mafic ones contain substantially higher amounts of MgO, Cr, Ni, Co and HREE and are characterized by relatively higher Mg-# (> 50. 6) but lower Sr/Y ratios. Interestingly, the dioritic dikes show elevated Sr/Y greater than 38 and up to 72. These features suggest that these magmas were derived from subarc fluid metasomatized lithospheric mantle and subjected to various degrees of fractional crystallization of hornblende. Together with literature data, these new data indicate that a major episode of Late Cretaceous arc magmatism along the southern Gangdese batholith and within-arc extension possibly due to northward oblique subduction of the Neo-Tethyan oceanic lithosphere.
WOS关键词	ZIRCON U-PB ; LINZIZONG VOLCANIC SUCCESSION ; MELT-PERIDOTITE INTERACTION ; HF ISOTOPIC COMPOSITION ; HIGH-FIELD-STRENGTH ; TRACE-ELEMENT ; RIDGE SUBDUCTION ; GEOCHEMICAL CHARACTERISTICS ; LITHOSPHERIC DELAMINATION ; CONTINENTAL COLLISION
WOS研究方向	Geology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000411744900006
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/61975]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Zeng LingSen
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China 2.Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Gao JiaHao,Zeng LingSen,Guo ChunLi,et al. Late Cretaceous tectonics and magmatism in Gangdese batholith, Southern Tibet: A record from the mafic-dioritic dike swarms within the Baidui Complex[J]. ACTA PETROLOGICA SINICA,2017,33(8):2412-2436.
APA	Gao JiaHao,Zeng LingSen,Guo ChunLi,Li QiuLi,&Wang YaYing.(2017).Late Cretaceous tectonics and magmatism in Gangdese batholith, Southern Tibet: A record from the mafic-dioritic dike swarms within the Baidui Complex.ACTA PETROLOGICA SINICA,33(8),2412-2436.
MLA	Gao JiaHao,et al."Late Cretaceous tectonics and magmatism in Gangdese batholith, Southern Tibet: A record from the mafic-dioritic dike swarms within the Baidui Complex".ACTA PETROLOGICA SINICA 33.8(2017):2412-2436.