Geochronological and geochemical constraints on the Luliang Group in the Luliang Complex: Implications for the tectonic evolution of the Trans-North China Orogen

doi:10.1016/j.lithos.2014.04.003

	Geochronological and geochemical constraints on the Luliang Group in the Luliang Complex: Implications for the tectonic evolution of the Trans-North China Orogen
	Liu, Chaohui 3; Zhao, Guochun 1; Liu, Fulai ; Shi, Jianrong
刊名	LITHOS
	2014
卷号	198 页码:298-315
关键词	Trans-North China Orogen Luliang Complex Back-arc basin Metabasic rocks Paleoproterozoic
ISSN号	0024-4937
DOI	10.1016/j.lithos.2014.04.003
英文摘要	The Luliang Complex is located at the western margin of the middle segment of the Trans-North China Orogen, along which the Western and Eastern Blocks amalgamated to form the basement of the North China Craton. The complex consists of the late Neoarchean to Paleoproterozoic granitic plutons and meta-supracrustal rocks, of which the latter are subdivided into the Jiehekou, Luliang,Yejishan, and Heichashan/Lanhe Groups. The Luliang Group is composed mainly of siliciclastic rocks in the lower part and volcanic rocks in the upper part, all of which have been metamorphosed from greenschist- to amphibolite-facies. U-Pb ages of detrital zircons from meta-sedimentary rocks in the Luliang Group yield four populations of 3061-2920 Ma, 2790-2600 Ma, 2599-2280 Ma and 2211-2202 Ma, suggesting that their provenances were derived mainly from the Luliang and Taihua Complexes in the Trans-North China Orogen. The meta-volcanic rocks give igneous zircon U-Pb ages of 2209-2178 Ma and epsilon(Hf)(t) values of -0.8 to +3.6. Geochemically, they are subalkaline basalts and andesites that can be classified into two groups, of which one group has flat LREEs, weak enrichment in LREEs relative to HREEs and flat HREEs and displays E-MORB-like spider diagrams with the exception of insignificantly negative Nb-Ta, Zr-Hf and Ti anomalies. In contrast, the other group displays stronger LREE fractionation, stronger enrichment in LREEs relative to HREEs and mildly fractionated HREEs and is characterized by "spiky" spider diagrams similar to arc volcanic rocks. The first group is interpreted to have originated from a Neoarchean E-MORB source, whereas the second group shows inputs of newly subduction-derived fluids in the mantle source. These geochronological and geochemical signatures indicate the existence of an 22-2.1 Ga continental back-arc system in the Luliang Complex of the Trans-North China Orogen, which is consistent with the model that the collision between the Eastern and Western Blocks to form the coherent basement of the North China Craton in the Paleoproterozoic, not at the end of Neoarchean. (C) 2014 Elsevier B.V. All rights reserved.
学科主题	构造地质学
WOS关键词	PB ZIRCON GEOCHRONOLOGY ; HIGH-PRESSURE GRANULITES ; IONIZATION MASS-SPECTROMETRY ; ARCHEAN CRUSTAL EVOLUTION ; ARC-BACK-ARC ; U-PB ; HENGSHAN COMPLEX ; GREENSTONE-BELT ; VOLCANIC-ROCKS ; FUPING COMPLEX
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000337851100021
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40529]
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.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China 3.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Liu, Chaohui,Zhao, Guochun,Liu, Fulai,et al. Geochronological and geochemical constraints on the Luliang Group in the Luliang Complex: Implications for the tectonic evolution of the Trans-North China Orogen[J]. LITHOS,2014,198:298-315.
APA	Liu, Chaohui,Zhao, Guochun,Liu, Fulai,&Shi, Jianrong.(2014).Geochronological and geochemical constraints on the Luliang Group in the Luliang Complex: Implications for the tectonic evolution of the Trans-North China Orogen.LITHOS,198,298-315.
MLA	Liu, Chaohui,et al."Geochronological and geochemical constraints on the Luliang Group in the Luliang Complex: Implications for the tectonic evolution of the Trans-North China Orogen".LITHOS 198(2014):298-315.