Origin of sapphirine- and garnet-bearing clinopyroxenite xenoliths entrained in the Jiande basalts, SE China

doi:10.1016/j.lithos.2018.02.004

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	Origin of sapphirine- and garnet-bearing clinopyroxenite xenoliths entrained in the Jiande basalts, SE China
	Xiao, Yan 1; Zhang, Hong-Fu 1,2; Liang, Zi 1,3; Su, Ben-Xun 3,4; Zhu, Bin 1; Sakyi, Patrick Asamoah 5
刊名	LITHOS
	2018-04-01
卷号	304 页码:95-108
关键词	Sapphirine Clinopyroxenite Xenolith Li Abundances Uplift Lithospheric Mantle
ISSN号	0024-4937
DOI	10.1016/j.lithos.2018.02.004
文献子类	Article
英文摘要	We present petrological and geochemical data of sapphirine- and garnet-bearing clinopyroxenite xenoliths entrained in the Jiande Cenozoic basalts, SE China, to investigate their igneous and metamorphic history, and reconstruct of the thermal-tectonic evolution of the lithospheric mantle. These xenoliths have an unusual mineral association consisting of clinopyroxene + garnet/kelyphite + spinel (+/- sapphirine). Clinopyroxene has high Mg# (89-93) and displays convex-upward REE pattern. Garnet, partially to completely kelyphitized, is rich in pyrope end-member. It usually includes relics of spine!, suggesting that garnet was formed at the expense of spine!. The spinel has high MgO (20.8-22.9 wt) and Al2O3 (64.8-67.9 wt%) contents. Sapphirine, forming a rim on spinet, has homogeneous SiO2 (14.5-14.9 wt%), Al2O3 (60.9-61.7 wt%) and MgO (19.7-20.1 wt%) contents, interpreted to be of metamorphic origin. The subsolidus reaction for the formation of sapphirine is as follows: spinel + garnet = sapphirine + clinopyroxene + orthopyroxene. Thus, the earliest mineral assemblage recorded in these xenoliths was spinet + clinopyroxene. The clinopyroxene in the Jiande clinopyroxenite xenoliths has Li abundances (1.04-1.63 ppm) similar to high-P mafic cumulate but much lower than those in crustal eclogite. In addition, the clinopyroxene and garnet do not show positive Eu anomalies. Therefore, the protolith of these three clinopyroxenite xenoliths was most likely a pyroxenite, originating as clinopyroxene + spinet cumulates from mafic melts percolating through the mantle. Many reaction textures such as formation of garnet and sapphirine were developed during decompression possibly coupled with cooling and melt percolation. During this process, the earlier composition of clinopyroxene and spinel also changed. The latest P-T conditions recorded in these xenoliths were at pressure of 8-10 kbar and temperatures of 1069-1094 degrees C. These observations imply that these rocks have been tectonically uplifted to shallower levels. The uplift process may have been related to lithospheric thinning process accompanied by lithosphere extension and upwelling of the asthenosphere in eastern China. (C) 2018 Elsevier B.V. All rights reserved.
WOS关键词	LITHOSPHERIC MANTLE BENEATH ; MELT-PERIDOTITE INTERACTIONS ; ALUMINOUS MAFIC ROCKS ; SINO-KOREAN CRATON ; CATHAYSIA BLOCK ; SOUTH CHINA ; SOUTHEASTERN CHINA ; RONDA PERIDOTITE ; TRACE-ELEMENT ; TEMPERATURE METAMORPHISM
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000430029800006
资助机构	National Natural Science Foundation of China(41673037 ; National Natural Science Foundation of China(41673037 ; National Natural Science Foundation of China(41673037 ; National Natural Science Foundation of China(41673037 ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; 41273020) ; 41273020) ; 41273020) ; 41273020) ; National Natural Science Foundation of China(41673037 ; National Natural Science Foundation of China(41673037 ; National Natural Science Foundation of China(41673037 ; National Natural Science Foundation of China(41673037 ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; 41273020) ; 41273020) ; 41273020) ; 41273020) ; National Natural Science Foundation of China(41673037 ; National Natural Science Foundation of China(41673037 ; National Natural Science Foundation of China(41673037 ; National Natural Science Foundation of China(41673037 ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; 41273020) ; 41273020) ; 41273020) ; 41273020) ; National Natural Science Foundation of China(41673037 ; National Natural Science Foundation of China(41673037 ; National Natural Science Foundation of China(41673037 ; National Natural Science Foundation of China(41673037 ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; Youth Innovation Promotion Association, Chinese Academy of Sciences(2017095) ; 41273020) ; 41273020) ; 41273020) ; 41273020)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/88345]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Xiao, Yan
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Shaanxi, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 5.Univ Ghana, Dept Earth Sci, POB LG 58, Legon, Ghana
推荐引用方式 GB/T 7714	Xiao, Yan,Zhang, Hong-Fu,Liang, Zi,et al. Origin of sapphirine- and garnet-bearing clinopyroxenite xenoliths entrained in the Jiande basalts, SE China[J]. LITHOS,2018,304:95-108.
APA	Xiao, Yan,Zhang, Hong-Fu,Liang, Zi,Su, Ben-Xun,Zhu, Bin,&Sakyi, Patrick Asamoah.(2018).Origin of sapphirine- and garnet-bearing clinopyroxenite xenoliths entrained in the Jiande basalts, SE China.LITHOS,304,95-108.
MLA	Xiao, Yan,et al."Origin of sapphirine- and garnet-bearing clinopyroxenite xenoliths entrained in the Jiande basalts, SE China".LITHOS 304(2018):95-108.