High-Mg olivine xenocrysts entrained in Cenozoic basalts in central Taihang Mountains: relicts of old lithospheric mantle

	High-Mg olivine xenocrysts entrained in Cenozoic basalts in central Taihang Mountains: relicts of old lithospheric mantle
	Tang, YJ; Zhang, HF; Ying, JF
刊名	ACTA PETROLOGICA SINICA
	2004-09-01
卷号	20 期号:5 页码:1243-1252
关键词	Taihang Mountains cenozoic basalt xenocrysts zoned texture
ISSN号	1000-0569
文献子类	Article
英文摘要	Cenozoic (7.8 Ma) basalts from central Taihang Mountains contain obviously zoned high-Mg-# olivines. The core is rich in MgO and NiO and poor in CaO and the rim has higher FeO, MnO, CaO and A(2)O(3) contents. High-Mg-# olivines have compositions in the core ( Mg-# = 90.1 similar to 92.3) very similar to the high-Mg-# ones from the mantle peridotitic xenoliths entrained in Cenozoic basalts from the North China Craton, and in the transitional zone ( Mg-# = 84.5 similar to 89.7) slightly higher than those in the core of olivine phenocrysts of the host basalts ( Mg-# = 77.1 similar to 81.7 The compositions in the rim of high-Mg-# olivines ( Mg-# = 55.6 similar to 73.6), identical to those of olivine phenocrysts of host basalts Mg-# = 55.6 similar to 73.6), are close to the olivines in groundmass ( Mg-# = 54.8 similar to 66.1). These compositional features as well as resorption borders and rounded crystal shapes demonstrate that these high-Mg-# olivines are mantle xenocrysts, i. e. disaggregates of mantle peridotites. The core compositions of big grains can represent those of olivines of mantle peridotites, which indicate that old lithospherie mantle should be existent in the Central Taihang Mountains in Cenozoic. Comparative studies show that large temporal and spatial difference exists in the lithosphere thinning in the North China.
WOS关键词	NORTH CHINA CRATON ; SINO-KOREAN CRATON ; MESOZOIC BASALTS ; BENEATH ; EVOLUTION ; CONSTRAINTS ; DESTRUCTION ; REPLACEMENT ; KEEL
WOS研究方向	Geology
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000224589100019
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/64405]
专题	中国科学院地质与地球物理研究所
通讯作者	Tang, YJ
作者单位	Chinese Acad Sci, Inst Geol & Geophys, Lab Lithospere Tecton Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Tang, YJ,Zhang, HF,Ying, JF. High-Mg olivine xenocrysts entrained in Cenozoic basalts in central Taihang Mountains: relicts of old lithospheric mantle[J]. ACTA PETROLOGICA SINICA,2004,20(5):1243-1252.
APA	Tang, YJ,Zhang, HF,&Ying, JF.(2004).High-Mg olivine xenocrysts entrained in Cenozoic basalts in central Taihang Mountains: relicts of old lithospheric mantle.ACTA PETROLOGICA SINICA,20(5),1243-1252.
MLA	Tang, YJ,et al."High-Mg olivine xenocrysts entrained in Cenozoic basalts in central Taihang Mountains: relicts of old lithospheric mantle".ACTA PETROLOGICA SINICA 20.5(2004):1243-1252.