Late Triassic adakitic plutons within the Archean terrane of the North China Craton: Melting of the ancient lower crust at the onset of the lithospheric destruction

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	Late Triassic adakitic plutons within the Archean terrane of the North China Craton: Melting of the ancient lower crust at the onset of the lithospheric destruction
	Wang, Chao 1; Song, Shuguang 1,2; Niu, Yaoling 2,3; Su, Li 4
刊名	LITHOS
	2015
卷号	212 页码:353-367
关键词	Adakitic plutons Melting of the Paleoproterozoic lower crust Crustal destruction in the Late Triassic North China Craton (NCC)
英文摘要	We present the results of a geochemical and geochronological study for Late Triassic (230 220 Ma) adakitic plutons within the Archean terrane of the eastern part of the North China Craton (NCC). These plutons show adakitic signatures with high Sr, Sr/Y, (La/Yb)(N), and low Cr and Ni. The enriched Nd-Hf isotopic compositions (epsilon(Nd)(t) = -13.3 to -12.9; epsilon(Hf)(t) = -17.4 to -14.6) and old Nd (T-DM2 = 2078-2037 Ma) and Hf (T-DM2 = 2366-2192 Ma) isotope model ages suggest that the adakitic pluton may be derived from the underplated mafic lower crust of Paleoproterozoic age. The relatively low Cr and Ni contents and lower epsilon(Nd)(t) and epsilon(Hf)(t) values of the Taili adaldtic plutons imply negligible input of mantle materials. Calculations of equilibrium mineral assemblages and modeling of trace element partition between melts and residual phases at different pressures confirm the interpretation that the petrogenesis of the Taili adakitic plutons is consistent with partial melting of the Paleoproterozoic mafic lower crust at 10-12 kbar (36-43 km) with a garnet granulite residue. Melting of the ancient mafic lower crust may be triggered by excess heating of the upwelling mantle in an extensional setting evoked by the contemporary subduction toward beneath the NCC from both north and south, which could serve as one possible mechanism for the destruction or lithospheric thinning of the NCC. Complex mantle-crust interaction through various mechanisms may have been responsible for the long-lived process of destruction or lithospheric thinning, which might have begun as early as in the late Triassic. (C) 2014 Elsevier B.V. All rights reserved.
收录类别	SCI
语种	英语
WOS记录号	WOS:000348879200024
公开日期	2015-06-16
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/25363]
专题	海洋研究所_海洋地质与环境重点实验室
作者单位	1.Peking Univ, MOE Key Lab Orogen Belts & Crustal Evolut, Sch Earth & Space Sci, Beijing 100871, Peoples R China 2.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England 3.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 4.China Univ Geosci, Inst Earth Sci, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Wang, Chao,Song, Shuguang,Niu, Yaoling,et al. Late Triassic adakitic plutons within the Archean terrane of the North China Craton: Melting of the ancient lower crust at the onset of the lithospheric destruction[J]. LITHOS,2015,212:353-367.
APA	Wang, Chao,Song, Shuguang,Niu, Yaoling,&Su, Li.(2015).Late Triassic adakitic plutons within the Archean terrane of the North China Craton: Melting of the ancient lower crust at the onset of the lithospheric destruction.LITHOS,212,353-367.
MLA	Wang, Chao,et al."Late Triassic adakitic plutons within the Archean terrane of the North China Craton: Melting of the ancient lower crust at the onset of the lithospheric destruction".LITHOS 212(2015):353-367.