Distinguishing silicate and carbonatite mantle metasomatism by using lithium and its isotopes

doi:10.1016/j.chemgeo.2014.05.016

	Distinguishing silicate and carbonatite mantle metasomatism by using lithium and its isotopes
	Su, Ben-Xun 1,2; Zhang, Hong-Fu 1; Deloule, Etienne 2; Vigier, Nathalie 2; Hu, Yan 3; Tang, Yan-Jie 1; Xiao, Yan 1; Sakyi, Patrick Asamoah 4
刊名	CHEMICAL GEOLOGY
	2014-08-14
卷号	381 页码:67-77
关键词	Li isotopes Mantle xenolith Carbonatite metasomatism Silicate metasomatism Lithospheric mantle
ISSN号	0009-2541
DOI	10.1016/j.chemgeo.2014.05.016
文献子类	Article
英文摘要	To investigate the effects of silicate and carbonatite metasomatism on mantle heterogeneity, we report lithium (Li) concentrations and isotopic compositions for olivine (Ol), orthopyroxene (Opx) and clinopyroxene (Cpx) from two suites of mantle xenoliths (Hannuoba, the North China Craton, and Haoti, the Western Qinling Orogen). The Hannuoba xenoliths range from lherzolite to pyroxenite and were affected by silicate metasomatism, whereas the Haoti xenoliths vary from harzburgite to wehrlite and were affected by carbonatite metasomatism. Lithium concentrations and isotopic compositions display a dichotomy between Hannuoba and Haoti xenoliths, and the overall variation exceeds what was previously reported. The minerals from Haoti xenoliths are more enriched in Li (Ol: 1.23-13.2 ppm; Opx: 3.00-82.8 ppm; Cpx: 1.39-112 ppm) than those from Hannuoba samples (Ol: 1.34-5.52 ppm; Opx: 0.23-16.1 ppm; Cpx: 1.18-79.8 ppm). Lithium isotopic compositions of these samples are highly variable in both suites of samples. delta Li-7 ranges from + 3.0 parts per thousand to + 41.9 parts per thousand in Ol, from -21.0 parts per thousand to + 20.2 parts per thousand in Opx and from -17.4 parts per thousand to + 18.9 parts per thousand in Cpx for Hannuoba samples. Haotiminerals display a similar degree of variation with delta Li-7 ranging from-29.1 parts per thousand to + 19.9 parts per thousand in Ol,-16.9 parts per thousand to+ 18.0 parts per thousand in Opx and -45.1 parts per thousand to + 19.6 parts per thousand in Cpx. On average, Li isotopic compositions of minerals from Hannuoba xenoliths follow the sequence of delta Li-7(Ol) > delta Li-7(Opx) > delta Li-7(Cpx), whereas those from Haoti xenoliths are characterized by the opposite sequence of delta Li-7(Cpx) > delta Li-7(Opx) > delta Li-7(Ol); in particular there is considerable difference in delta Li-7 values of Ol. The Li elemental and isotopic data suggest that mantle metasomatism by distinct agents is an important process for generating the large heterogeneity of Li abundances and isotopic distribution in the lithospheric mantle. The distinct geochemical characteristics of Li isotopes in silicate and carbonatite metasomatism are closely related to the preferential incorporation of Li into minerals from distinct melts. These findings further demonstrate that the Li isotopic systematics may in turn help to discriminate between silicate and carbonatite metasomatism. (C) 2014 Elsevier B. V. All rights reserved.
WOS关键词	NORTH CHINA CRATON ; SPINEL PERIDOTITE XENOLITHS ; LITHOSPHERIC MANTLE ; ENRICHED MANTLE ; ULTRAMAFIC XENOLITHS ; SOUTHERN PATAGONIA ; WESTERN VICTORIA ; ROCK INTERACTION ; HIGH-TEMPERATURE ; CANARY-ISLANDS
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000340208500007
资助机构	National Natural Science Foundation of China(41173011 ; National Natural Science Foundation of China(41173011 ; National Natural Science Foundation of China(41173011 ; National Natural Science Foundation of China(41173011 ; Hong Kong Scholars Program(XJ2012048) ; Hong Kong Scholars Program(XJ2012048) ; Hong Kong Scholars Program(XJ2012048) ; Hong Kong Scholars Program(XJ2012048) ; 91214203 ; 91214203 ; 91214203 ; 91214203 ; 41173009 ; 41173009 ; 41173009 ; 41173009 ; 91014007) ; 91014007) ; 91014007) ; 91014007) ; National Natural Science Foundation of China(41173011 ; National Natural Science Foundation of China(41173011 ; National Natural Science Foundation of China(41173011 ; National Natural Science Foundation of China(41173011 ; Hong Kong Scholars Program(XJ2012048) ; Hong Kong Scholars Program(XJ2012048) ; Hong Kong Scholars Program(XJ2012048) ; Hong Kong Scholars Program(XJ2012048) ; 91214203 ; 91214203 ; 91214203 ; 91214203 ; 41173009 ; 41173009 ; 41173009 ; 41173009 ; 91014007) ; 91014007) ; 91014007) ; 91014007) ; National Natural Science Foundation of China(41173011 ; National Natural Science Foundation of China(41173011 ; National Natural Science Foundation of China(41173011 ; National Natural Science Foundation of China(41173011 ; Hong Kong Scholars Program(XJ2012048) ; Hong Kong Scholars Program(XJ2012048) ; Hong Kong Scholars Program(XJ2012048) ; Hong Kong Scholars Program(XJ2012048) ; 91214203 ; 91214203 ; 91214203 ; 91214203 ; 41173009 ; 41173009 ; 41173009 ; 41173009 ; 91014007) ; 91014007) ; 91014007) ; 91014007) ; National Natural Science Foundation of China(41173011 ; National Natural Science Foundation of China(41173011 ; National Natural Science Foundation of China(41173011 ; National Natural Science Foundation of China(41173011 ; Hong Kong Scholars Program(XJ2012048) ; Hong Kong Scholars Program(XJ2012048) ; Hong Kong Scholars Program(XJ2012048) ; Hong Kong Scholars Program(XJ2012048) ; 91214203 ; 91214203 ; 91214203 ; 91214203 ; 41173009 ; 41173009 ; 41173009 ; 41173009 ; 91014007) ; 91014007) ; 91014007) ; 91014007)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/85353]
专题	中国科学院地质与地球物理研究所
通讯作者	Su, Ben-Xun
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.CNRS, CRPG, F-54501 Vandoeuvre Les Nancy, France 3.Univ Washington, Dept Earth & Space Sci, Isotope Lab, Seattle, WA 98195 USA 4.Univ Ghana, Dept Earth Sci, Legon, Accra, Ghana
推荐引用方式 GB/T 7714	Su, Ben-Xun,Zhang, Hong-Fu,Deloule, Etienne,et al. Distinguishing silicate and carbonatite mantle metasomatism by using lithium and its isotopes[J]. CHEMICAL GEOLOGY,2014,381:67-77.
APA	Su, Ben-Xun.,Zhang, Hong-Fu.,Deloule, Etienne.,Vigier, Nathalie.,Hu, Yan.,...&Sakyi, Patrick Asamoah.(2014).Distinguishing silicate and carbonatite mantle metasomatism by using lithium and its isotopes.CHEMICAL GEOLOGY,381,67-77.
MLA	Su, Ben-Xun,et al."Distinguishing silicate and carbonatite mantle metasomatism by using lithium and its isotopes".CHEMICAL GEOLOGY 381(2014):67-77.