Carbonatites of Tarim (NW China): First evidence of crustal contribution   in carbonatites from a large igneous province

doi:10.1016/j.lithos.2017.02.018

CORC > 北京大学 > 地球与空间科学学院

	Carbonatites of Tarim (NW China): First evidence of crustal contribution in carbonatites from a large igneous province
	Song, WenLei ; Xu, Cheng ; Chakhmouradian, Anton R. ; Kynicky, Jindrich ; Huang, KangJun ; Zhang, ZhenLiang
刊名	LITHOS
	2017
关键词	Carbonatite Large igneous province Plume Subducted sediments Carbonate recycling MAGNESIUM ISOTOPIC COMPOSITION RARE-EARTH-ELEMENTS MANTLE PLUME CONTINENTAL-CRUST OLDOINYO LENGAI QINLING OROGEN ISLAND BASALTS FLOOD BASALTS EVOLUTION MG
DOI	10.1016/j.lithos.2017.02.018
英文摘要	Many carbonatites are associated both spatially and temporally with large igneous provinces (LIPs), and considered to originate from a mantle plume source lacking any contribution from recycled crustal materials. Here, we report an occurrence of carbonatite enriched in rare-earth elements (REE) and associated with the Tarim LIP in northwestern China The Tarim LIP comprises intrusive and volcanic products of mantle plume activity spanning from similar to 300 to 280 Ma. The carbonatites at Wajilitage in the northwestern part of Tarim are dominated by calcite and dolomite varieties, and contain abundant REE minerals (principally, monazite and REE-fluorcarbonates). Th-Pb age determination of monazite yielded an emplacement age of 266 +/- 5.3 Ma, i.e. appreciably younger than the eruption age of flood basalts at similar to 290 Ma. The carbonatites show low initial Sr-87/Sr-86 (0.7037-0.7041) and high epsilon(Nd(t)) (1.2-4)values, which depart from the isotopic characteristics of plume-derived basalts and high-Mg picrites from the same area. This indicates that the Wajilitage carbonatites derived from a mantle source isotopically distinct from the one responsible for the voluminous (ultra)mafic volcanism at Tarim. The carbonatites show delta Mg-26(DSM3) values (-0.99 to -0.65%.) that are significantly lower than those in typical mantle-derived rocks and rift carbonatites, but close to marine sediments and orogenic carbonatites. We propose that the carbonatites in the Tarim LIP formed by decompressional melting of recycled sediments mixed with the ambient mantle peridotite. The enriched components in the Tarim plume could be accounted for by the presence of recycled sedimentary components in the subcontinental mantle. (C) 2017 Elsevier B.V. All rights reserved.; Chinese National Science Foundation [41573033]; Chinese '973' Project [2013CB429800]; European Union's Horizon 2020 [689909]; Natural Sciences and Engineering Research Council (Canada); SCI(E); ARTICLE; 1-9; 282
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/473224]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Song, WenLei,Xu, Cheng,Chakhmouradian, Anton R.,et al. Carbonatites of Tarim (NW China): First evidence of crustal contribution in carbonatites from a large igneous province[J]. LITHOS,2017.
APA	Song, WenLei,Xu, Cheng,Chakhmouradian, Anton R.,Kynicky, Jindrich,Huang, KangJun,&Zhang, ZhenLiang.(2017).Carbonatites of Tarim (NW China): First evidence of crustal contribution in carbonatites from a large igneous province.LITHOS.
MLA	Song, WenLei,et al."Carbonatites of Tarim (NW China): First evidence of crustal contribution in carbonatites from a large igneous province".LITHOS (2017).