Paleoproterozoic ophiolite remnants in the northern margin of the North China Craton: Evidence from the Chicheng peridotite massif

doi:10.1016/j.lithos.2019.06.025

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

	Paleoproterozoic ophiolite remnants in the northern margin of the North China Craton: Evidence from the Chicheng peridotite massif
	Liu, Hui1,2 ; Zhang, Hong-Fu 2,3
刊名	LITHOS
	2019-11-01
卷号	344 页码:311-323
关键词	Northern North China Craton Hongqiyingzi Group Peridotite massif Metasomatic melt/fluid impregnation Ophiolite remnants
ISSN号	0024-4937
DOI	10.1016/j.lithos.2019.06.025
英文摘要	Precambrian ophiolites provide important clues to the onset of modern-style plate tectonics. Peridotite massifs exposed in Chicheng area in the northern margin of the North China Craton occur as discrete tectonic lenses or boudins within Archean-Paleoproterozoic meta-volcanic and meta-sedimentary rocks of the Hongqiyingzi Group, along with retrograde eclogites. These serpentinized peridotites are composed dominantly of harzburgites and dunites, with minor ultramafic cumulates. Here we report the petrography, whole-rock chemical compositions, and mineral chemistry of the Chicheng peridotites with a view to evaluate their genesis and tectonic significance. The high Mg-number (91.2-93.5), low Al2O3 and CaO contents of harzburgites and dunites, as well as the high Fo values of olivine and Cr-number of spinel from these rocks suggest that the rocks represent highly refractory residues of partial melting. The ultramafic cumulates on the top of the peridotite massif might represent the early ultramafic cumulates from partial melt, as indicated by their relatively low Mg-number (87.0 and 91.8), and slightly higher Al2O3 and CaO contents. We infer that the Chicheng peridotites represent fragments of ancient sub-oceanic lithospheric mantle. The peridotites and the coexisting retrograded eclogites together with the gneisses in Chicheng might form part of a tectonically dismembered Paleoproterozoic ophiolite. The ophiolite was emplaced along the continental margin and subducted to the depth of eclogites facies during the formation of the Trans-North China Orogen. The metasomatized orthopyroxene in the Chicheng peridotites and flat REE pattern of whole rocks indicate melt/fuild metasomatism on residual peridotites during the post-melting stage. Amphiboles mostly show tremolite composition and were formed by retrograde metamorphism as displayed by their low Na, K, Ti and high Si contents. The ubiquitous existence of metamorphic amphiboles in Chicheng peridotites suggests that the ophiolite was subjected to amphibole-fades metamorphism before their exhumation in the Phanerozoic. The recognition of the ophiolite and its evolution history suggest that modern-style plate tectonics had begun at least in the Paleoproterozoic. (C) 2019 Elsevier B.V. All rights reserved.
资助项目	Natural Science Foundation of China[41688103]
WOS关键词	MID-ATLANTIC RIDGE ; AL ORTHO-PYROXENE ; UPPER-MANTLE ; ABYSSAL PERIDOTITES ; LITHOSPHERIC MANTLE ; OMAN OPHIOLITE ; SUBDUCTION INITIATION ; TECTONIC EVOLUTION ; MELT EXTRACTION ; OS ISOTOPE
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000483419900020
资助机构	Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/93594]
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	Zhang, Hong-Fu
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Liu, Hui,Zhang, Hong-Fu. Paleoproterozoic ophiolite remnants in the northern margin of the North China Craton: Evidence from the Chicheng peridotite massif[J]. LITHOS,2019,344:311-323.
APA	Liu, Hui,&Zhang, Hong-Fu.(2019).Paleoproterozoic ophiolite remnants in the northern margin of the North China Craton: Evidence from the Chicheng peridotite massif.LITHOS,344,311-323.
MLA	Liu, Hui,et al."Paleoproterozoic ophiolite remnants in the northern margin of the North China Craton: Evidence from the Chicheng peridotite massif".LITHOS 344(2019):311-323.