Geochronological and geochemical studies on the amphibolite enclaves of the Neoarchean granitoids in the Wutai Complex

	Geochronological and geochemical studies on the amphibolite enclaves of the Neoarchean granitoids in the Wutai Complex
	Liu ChaoHui 2; Liu FuLai ; Shi JianRong
刊名	ACTA PETROLOGICA SINICA
	2014
卷号	30 期号:10 页码:2857-2871
关键词	Wutai Complex Amphibolite enclave Zircon U-Pb age Geochemistry North China Craton
ISSN号	1000-0569
英文摘要	The Trans-North China Orogen (TNCO) is considered to be a continent-continent belt, along which the Eastern Block and Western Block collided. The Hengshan-Wutai-Fuping belt is located in the middle segment of the TNCO and is the largest and lithologically representative basement exposure. The Wutai Complex can be divided into supracrustal rocks and granitoids. The former has been subdivided into the Wutai and Hutuo groups and the latter have been subdivided into the 2560 similar to 2520Ma strongly deformed diorite-tonalite-trondhjemite-granodiorite suits, the 2176 similar to 2084Ma weakly deformed porphyritic syenogranites and the similar to 1810Ma undeformed A-type granites. Amphibolites occur as lenticular or elliptical enclaves in the Wutai granitoids, outcrops of which vary in sizes from several meters to several tens of meters and in color from green to black. Geochemical features indicate that their protoliths are igneous and similar to tholeiite. Zircon U-Pb dating results suggest that their protoliths crystallized at similar to 2. 7Ga and are metamorphosed at similar to 1. 85Ga. Their whole-rock epsilon(Nd) (t) values are similar to 3. 1 to + 3.5 and t(DM) ages are 2. 83Ga to 3. 65Ga. In the primitive mantle-normalized spider diagram, they are characterized by Nb, Ta and Ti negative anomalies. On the other way, in the chondrite-normalized REE diagram, they exhibit slightly LREE enrichment [ (La/Yb)(N) =1. 36 similar to 3. 52] and flat HREE [ (Gd/Yb)(N) =0. 94 similar to 1. 38]. Geochemical and isotopic results suggest that their protoliths may have formed by partial melting of spinel-bearing lherzolites from a slightly enriched mantle, which had been metasomatized by subduction-related fluids. More importantly, similarities of the zircon U-Pb age and t ages of 2. 7 similar to 2. 8Ga indicate an important crustal growth event in the North China Craton.
学科主题	变质岩岩石学
WOS关键词	NORTH CHINA CRATON ; U-PB AGES ; PALEOPROTEROZOIC HUTUO GROUP ; HIGH-PRESSURE GRANULITES ; CENTRAL OROGENIC BELT ; LOWER CRUSTAL SECTION ; TECTONIC EVOLUTION ; ZIRCON GEOCHRONOLOGY ; HF ISOTOPES ; METAMORPHIC EVOLUTION
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000344215200006
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40482]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China 2.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Liu ChaoHui,Liu FuLai,Shi JianRong. Geochronological and geochemical studies on the amphibolite enclaves of the Neoarchean granitoids in the Wutai Complex[J]. ACTA PETROLOGICA SINICA,2014,30(10):2857-2871.
APA	Liu ChaoHui,Liu FuLai,&Shi JianRong.(2014).Geochronological and geochemical studies on the amphibolite enclaves of the Neoarchean granitoids in the Wutai Complex.ACTA PETROLOGICA SINICA,30(10),2857-2871.
MLA	Liu ChaoHui,et al."Geochronological and geochemical studies on the amphibolite enclaves of the Neoarchean granitoids in the Wutai Complex".ACTA PETROLOGICA SINICA 30.10(2014):2857-2871.