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	Importance of melt circulation and crust-mantle interaction in the lithospheric evolution beneath the North China Craton: Evidence from Mesozoic basalt-borne clinopyroxene xenocrysts and pyroxenite xenoliths
	Zhang, Hong-Fu ; Ying, Ji-Feng ; Shimoda, Gen ; Kita, Noriko T. ; Morishita, Yuichi ; Shao, Ji-An ; Tang, Yan-He
	2007
关键词	clinopyroxene xenocryst pyroxenite xenolith crust-mantle interaction lithospheric evolution North China Craton SINO-KOREAN CRATON MAFIC IGNEOUS ROCKS TRACE-ELEMENT SHANDONG PROVINCE ISOTOPIC CONSTRAINTS TECTONIC EVOLUTION CONTINENTAL-CRUST EASTERN CHINA HIGH-PRESSURE DABIE OROGEN
英文摘要	Mesozoic Fangcheng basalts from the North China Craton contain many clinopyroxene xenocrysts and pyroxenite xenoliths, which provide important information about melt circulation and crust-mantle interaction in the evolution of the sub-continental lithosphere beneath the region. All the xenocrysts show textural and chemical zoning. The zoning is mostly simple (simply-zoned), but some show, complex patterns (complexly-zoned). In-situ major and trace element analyses suggest that all the simply-zoned xenocrysts may have been disaggregated from pyroxenite veins at mantle depth. The zoning is interpreted to result from chemical exchange with the host magma after their entrainment. The complexly-zoned xenocrysts record a complicated history of the lithospheric evolution: their cores could preserve information of high-temperature granulite-facies metamorphism in the lower crust and their intermediary zones might record metamorphic overgrowth in the mantle spinel-facies stability field. Therefore, the cores of the complexly-zoned xenocrysts have probably been derived from the Archean lower crust or newly-accreted lower crust and the intermediary zones could be formed through crust-mantle interaction. All the pyroxenite xenoliths are cumulates and were crystallized from the LREE enriched melts at mantle depth or crust-mantle transitional zone. Thus the clinopyroxene xenocrysts and pyroxenite xenoliths provide evidence for the existence of considerable crust-mantle interaction and melt circulation in the lithospheric mantle, which led to rapid lithospheric enrichment. (C) 2006 Elsevier B.V. All rights reserved.; Geochemistry & Geophysics; Mineralogy; SCI(E); CPCI-S(ISTP); 0
语种	英语
DOI标识	10.1016/j.lithos.2006.10.002
内容类型	其他
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/250564]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zhang, Hong-Fu,Ying, Ji-Feng,Shimoda, Gen,et al. Importance of melt circulation and crust-mantle interaction in the lithospheric evolution beneath the North China Craton: Evidence from Mesozoic basalt-borne clinopyroxene xenocrysts and pyroxenite xenoliths. 2007-01-01.

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