Mineralogical and Petrogeochemical characteristics of ultramafic rocks from the metamorphic basement of the Jiaobei terrane

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

	Mineralogical and Petrogeochemical characteristics of ultramafic rocks from the metamorphic basement of the Jiaobei terrane
	Kong FanMei 1; Liu Yun 1; Li XuPing 1; Guo JingHui 2; Zhao GuoChun 3
刊名	ACTA PETROLOGICA SINICA
	2015-06-01
卷号	31 期号:6 页码:1549-1563
关键词	Metamorphic basement Ultramafic rocks Mineralogy Petrological geochemistry Jiabei terrene
文献子类	Article
英文摘要	The ultramafic rocks, including serpentinite, serpentinized spinel-orthopyroxene peridotite, spinel olivine pyroxenite and spinel-bearing amphibolite, were collected from the metamorphic basement of Jiaobei terrene. They record three-stage mineral assemblages: Opx(1) + Ol(1) + Spl(1), Opx(2) + Ol(2) + Spl(2) + Amp(2) and Amp(3) + Srp(3) + Mag(3) + Cal, and experienced high amphibolite facies and greenschist facies metamorphism. Amphibole porphyroblasts pervasively occur in each type rock, formed during high amphibolite and green-schist facies metamorphism. No deformation was observed in the serpentinite, indicating that serpentinization occurred in the late stage by metasomatism. Chemical compositions of the orthopyroxenites and high MgO spinal peridotites are of characteristics of cratonic peridotite. REE rations of (La/Sm)(N) 1.11 similar to 1.41, (La/Yb)(N) 0.91 similar to 1.61 in amphibolite, and no HSFE anomaly in multi-element pattern in the ultramafic rocks indicate that the ultramafic rocks are probably formed in a continental rift environment. Spinel compositions in the spinel peridotities have Mg-# 0.72 similar to 0.79, Cr-# 0.06 similar to 0.12 showing the metasomatic origin. Fo 88.42 similar to 90.50 in harzburgite, dispersive distribution of major elements of ultramafic rocks, big variation of Sigma REE, the genetic relationships of diagrams of uhrmafic rocks and amphibolites from Si/Al-( Mg + Fe)/Al and Mg/Ti-Fe/Ti are all indicative of that the ultramafic rocks from the metamorphic basement of the Jiaobei terrane are probably a cumulate origin of a set of mantle-derived magma. High MgO content (16% similar to 42%) in ultramafic rocks exhibit a characteristics of the mantle from Precambrian basement, and high water contents of ultramafic rocks reflect the complicated metamorphic processes from long-term geological evolution.
WOS关键词	NORTH CHINA CRATON ; LIAO-JI BELT ; PRESSURE MAFIC GRANULITE ; P-T PATH ; MID-ATLANTIC RIDGE ; TECTONIC IMPLICATIONS ; EASTERN SHANDONG ; GEOCHEMICAL CHARACTERISTICS ; PERIDOTITE XENOLITHS ; MANTLE PERIDOTITES
WOS研究方向	Geology
语种	英语
WOS记录号	WOS:000357547700005
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/62345]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位	1.Shandong Univ Sci & Technol, Shandong Prov Key Lab Deposit Mineralizat & Sedim, Qingdao 266510, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China
推荐引用方式 GB/T 7714	Kong FanMei,Liu Yun,Li XuPing,et al. Mineralogical and Petrogeochemical characteristics of ultramafic rocks from the metamorphic basement of the Jiaobei terrane[J]. ACTA PETROLOGICA SINICA,2015,31(6):1549-1563.
APA	Kong FanMei,Liu Yun,Li XuPing,Guo JingHui,&Zhao GuoChun.(2015).Mineralogical and Petrogeochemical characteristics of ultramafic rocks from the metamorphic basement of the Jiaobei terrane.ACTA PETROLOGICA SINICA,31(6),1549-1563.
MLA	Kong FanMei,et al."Mineralogical and Petrogeochemical characteristics of ultramafic rocks from the metamorphic basement of the Jiaobei terrane".ACTA PETROLOGICA SINICA 31.6(2015):1549-1563.