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	Geochemistry of late-cenozoic basalts from leigiong area: the origin of em2 and the contribution from sub-continental lithosphere mantle
	Han JiangWei1,2; Xiong XiaoLin1; Zhu ZhaoYu1
刊名	Acta petrologica sinica
	2009-12-01
卷号	25期号:12页码:3208-3220
关键词	Leigiong Basalts Em2 Lithospheric mantle
ISSN号	1000-0569
通讯作者	Han jiangwei(bgphan@163.com)
英文摘要	The major-, trace-element and sr-nd-pb isotopic ratios of 21 late-cenozoic basalts from leiqiong area were determined by wet chemical method, icp-ms and mc-ipcms, respetively. normative mineral calculation suggested that leiqiong basalts were dominated by quartz tholeiites with subsidiary olivine tholeiites and alkaline basalts. the trace elements and isotopic composition of these basalts resembled oibs. in addition, the incompatible elements abundance increased with increasing sio(2)-undersaturation. the chemical and isotopic compositions of most basalts might be inherited from their mantle source except that sample r4-1 showed characteristics of crustal contamination. the positive correlation between (87)sr/(86)sr and (206)pb/(204)pb as well as negative correlation between (143)nd/(144)nd and (206)pb/(204)pb implied a mixing of a depleted asthenospheric mantle and an em2 composition ( existing in the sub-continental lithosphere mantle beneath this region). the even more depleted sr and nd isotope of mantle xenoliths from leiqiong than their host basalts indicated that the spinel peridotite mantle represented by the xenoliths could never produce these basaltic rocks. the la/yb-sm/yb system of leiqiong basalts required that the melting occurred in the garnet peridotite and in turn implied the em2 composition should be derived from the lower lithosphere mantle ( garnet phase stable field). the geochemical diversity of leiqiong basalts could be interpreted as follows; the low degree of melt (7% similar to 9%) from upwelling asthenospheric mantle and garnet peridotite mantle produced the alkaline basalts and olivine tholeiites while relatively higher degree of melt (10% similar to 20%) from asthenospheric mantle and a higher proportion of garnet peridotite mantle made the quartz tholeiites.
WOS关键词	NORTH CHINA CRATON ; SOUTH CHINA ; VOLCANIC-ROCKS ; EASTERN CHINA ; TRACE-ELEMENT ; ASTHENOSPHERE INTERACTION ; LEIZHOU PENINSULA ; HAINAN ISLAND ; SE CHINA ; PB
WOS研究方向	Geology
WOS类目	Geology
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000276369900009
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2403079
专题	中国科学院大学
通讯作者	Han JiangWei
作者单位	1.CAS, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Han JiangWei,Xiong XiaoLin,Zhu ZhaoYu. Geochemistry of late-cenozoic basalts from leigiong area: the origin of em2 and the contribution from sub-continental lithosphere mantle[J]. Acta petrologica sinica,2009,25(12):3208-3220.
APA	Han JiangWei,Xiong XiaoLin,&Zhu ZhaoYu.(2009).Geochemistry of late-cenozoic basalts from leigiong area: the origin of em2 and the contribution from sub-continental lithosphere mantle.Acta petrologica sinica,25(12),3208-3220.
MLA	Han JiangWei,et al."Geochemistry of late-cenozoic basalts from leigiong area: the origin of em2 and the contribution from sub-continental lithosphere mantle".Acta petrologica sinica 25.12(2009):3208-3220.

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