Permian basaltic rocks in the Tarim basin, NW China: Implications for plume-lithosphere interaction

doi:10.1016/j.gr.2010.03.006

	Permian basaltic rocks in the Tarim basin, NW China: Implications for plume-lithosphere interaction
	Zhang, Yutao; Liu, Jiaqi; Guo, Zhengfu
刊名	GONDWANA RESEARCH
	2010-11-01
卷号	18 期号:4 页码:596-610
关键词	Tarim basin Oceanic island basalts (OIB) Large igneous province (LIP) Mantle plume Geochemistry
ISSN号	1342-937X
DOI	10.1016/j.gr.2010.03.006
文献子类	Article
英文摘要	There are large areas of Permian basaltic rocks in the Tarim basin (PBRT) in northwestern China. Precise Ar-Ar dating of these rocks revealed an eruption age span of 262 to 285 Ma. Most of the PBRT is composed of alkaline basaltic rocks with high TiO2 (2.43%-4.59%, weight percent), high Fe2O3 + FeO (12.63%-17.83%) and P2O5 (0.32%-1.38%) contents. Trace elements of these rocks have affinities with oceanic island basalts (OIB), as shown in chondrite normalized rare earth elements (REE) diagrams and primitive mantle normalized incompatible elements diagrams. The rocks show complex Sr-Nd isotopic character based on which they can be subdivided into two distinct groups: group 1 has relatively small initial (t=280 Ma)Sr-87/Sr-86 ratio (similar to 0.7048) and positive epsilon Nd(t) (3.42-4.66) values. Group 2 has relatively large initial Sr-87/Sr-86 ratio (0.7060-0.7083) and negative epsilon Nd(t) (from -2.79 to -2.16) values. Lead isotopes are even more complex with variations of (Pb-206/Pb-204)t, (Pb-207/Pb-204)t and (Pb-208/Pb-204)t ranging from 17.9265 to 18.5778, 15.4789 to 15.6067 and 37.2922 to 38.1437, respectively. Moreover, these two groups have different trace elements ratios such as Nb/La, Ba/Nb, Zr/Nb, Nb/Ta and Zr/Hf, implying different magmatic processes. Based on the geochemistry of basaltic rocks and an evaluation of the tectonics, deformation, and the compositions of crust and lithospheric mantle in Tarim, we conclude that these basaltic rocks resulted from plume-lithosphere interaction. Permian mantle plume caused an upwelling of the Tarim lithosphere leading to melting of the asthenospheric mantle by decompression. The magma ascended rapidly to the base of lower crust, where different degrees of assimilation of OIB-like materials and fractionation occurred. Group 1 rocks formed where the upwelling is most pronounced and the assimilation was negligible. In other places, different degrees of assimilation and fractionation account for the geochemical traits of group 2. (C) 2010 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
WOS关键词	LARGE IGNEOUS PROVINCES ; EMEISHAN FLOOD BASALTS ; VOLCANIC-ROCKS ; MANTLE PLUME ; TECTONIC IMPLICATIONS ; NORTHWESTERN CHINA ; IMMOBILE ELEMENTS ; TRIASSIC BOUNDARY ; CRUSTAL STRUCTURE ; SIBERIAN TRAPS
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000283006800004
资助机构	China Petroleum & Chemical Corporation (SINOPEC)(YPH08064) ; China Petroleum & Chemical Corporation (SINOPEC)(YPH08064) ; Major State Basic Research Development Program of China (973)(2009CB219301) ; Major State Basic Research Development Program of China (973)(2009CB219301) ; National Science Found Committee(40803012) ; National Science Found Committee(40803012) ; China Petroleum & Chemical Corporation (SINOPEC)(YPH08064) ; China Petroleum & Chemical Corporation (SINOPEC)(YPH08064) ; Major State Basic Research Development Program of China (973)(2009CB219301) ; Major State Basic Research Development Program of China (973)(2009CB219301) ; National Science Found Committee(40803012) ; National Science Found Committee(40803012) ; China Petroleum & Chemical Corporation (SINOPEC)(YPH08064) ; China Petroleum & Chemical Corporation (SINOPEC)(YPH08064) ; Major State Basic Research Development Program of China (973)(2009CB219301) ; Major State Basic Research Development Program of China (973)(2009CB219301) ; National Science Found Committee(40803012) ; National Science Found Committee(40803012) ; China Petroleum & Chemical Corporation (SINOPEC)(YPH08064) ; China Petroleum & Chemical Corporation (SINOPEC)(YPH08064) ; Major State Basic Research Development Program of China (973)(2009CB219301) ; Major State Basic Research Development Program of China (973)(2009CB219301) ; National Science Found Committee(40803012) ; National Science Found Committee(40803012)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/72022]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhang, Yutao
作者单位	Chinese Acad Sci, Key Lab Cenozo Geol & Environm, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yutao,Liu, Jiaqi,Guo, Zhengfu. Permian basaltic rocks in the Tarim basin, NW China: Implications for plume-lithosphere interaction[J]. GONDWANA RESEARCH,2010,18(4):596-610.
APA	Zhang, Yutao,Liu, Jiaqi,&Guo, Zhengfu.(2010).Permian basaltic rocks in the Tarim basin, NW China: Implications for plume-lithosphere interaction.GONDWANA RESEARCH,18(4),596-610.
MLA	Zhang, Yutao,et al."Permian basaltic rocks in the Tarim basin, NW China: Implications for plume-lithosphere interaction".GONDWANA RESEARCH 18.4(2010):596-610.