Geochemical characteristics and genesis of the high-pressure mafic;granulite in the Jiaobei high-grade metamorphic basement, eastern;Shandong, China

	Geochemical characteristics and genesis of the high-pressure mafic;granulite in the Jiaobei high-grade metamorphic basement, eastern;Shandong, China
	Liu PingHua; Liu FuLai; Wang Fang; Liu JianHui; Yang Hong; Shi JianRong
刊名	ACTA PETROLOGICA SINICA
	2012
卷号	28 期号:9 页码:2705-2720
ISSN号	022HC
英文摘要	The types of the high-pressure (HP) mafic granulites from high-grade metamorphic basement of the Jiaobei terrane are mainly composed of Grt mafic granulites, Grt-Hy granulites and Grt amphibolites. The HP mafic granulites are mainly occurred in TTG gneisses or granitic gneisses as enclaves or deformed dikes in the Jiaobei terrane. Mobile elements such as the large ion lithophile elements (K, Na, Sr, Rb) of the HP mafic granulites changed in significant levels, high field strength elements (Th, Nb, Zr, Ti) and rare earth elements basically unchanged and keep stable during the metamorphic process. The HP mafic granulites from the Jiaobei terrane belong to tholeiitic-basaltic rock series, with the concentrations of SiO2 at 44.04% similar to 53.54%, and Mg-# at 35 similar to 60. The composition of the rare earth elements of the HP mafic granulites is characterized by the flat (Sigma REE = 21.13 x 10(-6) similar to 78.49 x 10(-6), (La/Yb)(CN) = 1.03 similar to 2.86) and right-inclined (92.74 x 10(-6) similar to 133.5 x 10(-6), (La/Yb)(CN) = 2.93 similar to 4.56) on the chondrite-normalized REE patterns with no Eu anomalies (Eu/Eu-center dot = 0.93 similar to 1.04). The variation of Cr and Ni concentrations is large, however Cr and Ni have strong correlation with MgO. All most samples of the HP mafic granulites share obvious negative anomaly in Nb, Zr and Ti of the Phanerozoic island arc basalts, with the positive epsilon(Nd) (t) of (+ 2.70 similar to +4.77). The composition of the major and trace elements of the HP mafic granulites in the Jiaobei terrane is characterized by the island arc tholeiitic basaltic rocks, and the protoliths may be gabbro instrusions or diabase dykes, and the corresponding basic volcanic rocks in back-carc extension tectonic setting.
学科主题	变质岩岩石学
WOS关键词	U-PB ZIRCON ; ISUA GREENSTONE-BELT ; LIAO-JI BELT ; NORTH CHINA ; CONTINENTAL-CRUST ; TRACE-ELEMENT ; TECTONIC IMPLICATIONS ; JIAODONG ; PENINSULA ; WEST GREENLAND ; OCEANIC-CRUST
WOS研究方向	Geology
语种	中文
WOS记录号	WOS:000309947500004
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39652]
专题	中国地质科学院地质研究所
作者单位	Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China.
推荐引用方式 GB/T 7714	Liu PingHua,Liu FuLai,Wang Fang,et al. Geochemical characteristics and genesis of the high-pressure mafic;granulite in the Jiaobei high-grade metamorphic basement, eastern;Shandong, China[J]. ACTA PETROLOGICA SINICA,2012,28(9):2705-2720.
APA	Liu PingHua,Liu FuLai,Wang Fang,Liu JianHui,Yang Hong,&Shi JianRong.(2012).Geochemical characteristics and genesis of the high-pressure mafic;granulite in the Jiaobei high-grade metamorphic basement, eastern;Shandong, China.ACTA PETROLOGICA SINICA,28(9),2705-2720.
MLA	Liu PingHua,et al."Geochemical characteristics and genesis of the high-pressure mafic;granulite in the Jiaobei high-grade metamorphic basement, eastern;Shandong, China".ACTA PETROLOGICA SINICA 28.9(2012):2705-2720.