Origin of clinopyroxene megacrysts in volcanic rocks from the North China Craton: a comparison study with megacrysts worldwide

doi:10.1080/00206814.2019.1663766

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

	Origin of clinopyroxene megacrysts in volcanic rocks from the North China Craton: a comparison study with megacrysts worldwide
	Liu, Ya-Dong 1,2,3; Ying, Ji-Feng 1,3
刊名	INTERNATIONAL GEOLOGY REVIEW
	2019-09-08
页码	17
关键词	Clinopyroxene megacryst host basalt trace element Sr-Nd isotopes North China Craton
ISSN号	0020-6814
DOI	10.1080/00206814.2019.1663766
英文摘要	Clinopyroxene megacrysts in volcanic rocks can provide substantial information on the evolution of the magmatic system at depth. Although considerable attention has been paid to these crystals, their origin is not yet completely resolved. The clinopyroxene megacrysts worldwide can be divided into two major types in general: the green Cr-diopside type and the black Al-augite type. There is a consensus view that the Cr-diopside megacrysts are mantle xenocrysts, whereas two contrasting opinions exist regarding the origin of the black Al-augite megacrysts. One favours a cognate origin, viewing them as crystallization products of the host magmas under high-pressure; while the other argues that they are xenocrysts crystallized from previous alkali basalts or fragments of mantle peridotites, pyroxenites or pegmatite veins. A review study on the clinopyroxene megacrysts in Meso-Cenozoic volcanic rocks from the North China Craton (NCC) and their comparison with those worldwide provides new constraints on their origin, namely, the Cr-diopside megacrysts, as previously thought, are all xenocrysts, representing disaggregated clinopyroxene crystals from clinopyroxene-rich mantle rocks. Contrary to the formerly proposed cognate origin, the Al-augite megacrysts are also xenocrysts, having no direct genetic link to their host rocks. They crystallized from melts that have formed earlier than the host magmas, and probably accumulated in a magma chamber or occurred as sheets or veins filling a fracture network surrounding a magma chamber in the upper mantle. During the subsequent eruption of the host lavas, these previously formed crystals were incorporated into the magma and were brought up to the surface.
资助项目	National Natural Science Foundation of China[41688103] ; National Natural Science Foundation of China[41873036] ; National Natural Science Foundation of China[41473035]
WOS关键词	HIGH-PRESSURE MEGACRYSTS ; LOWER CRUSTAL XENOLITHS ; TRACE-ELEMENT GEOCHEMISTRY ; MANTLE-DERIVED XENOLITHS ; SIZE DISTRIBUTION CSD ; GRIB KIMBERLITE PIPE ; NEW-SOUTH-WALES ; ALKALI-BASALTS ; PYROXENITE XENOLITHS ; PERIDOTITE XENOLITHS
WOS研究方向	Geology
语种	英语
出版者	TAYLOR & FRANCIS INC
WOS记录号	WOS:000485459800001
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/93595]
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	Ying, Ji-Feng
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, Coll Earth & Planetary Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Earth Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Liu, Ya-Dong,Ying, Ji-Feng. Origin of clinopyroxene megacrysts in volcanic rocks from the North China Craton: a comparison study with megacrysts worldwide[J]. INTERNATIONAL GEOLOGY REVIEW,2019:17.
APA	Liu, Ya-Dong,&Ying, Ji-Feng.(2019).Origin of clinopyroxene megacrysts in volcanic rocks from the North China Craton: a comparison study with megacrysts worldwide.INTERNATIONAL GEOLOGY REVIEW,17.
MLA	Liu, Ya-Dong,et al."Origin of clinopyroxene megacrysts in volcanic rocks from the North China Craton: a comparison study with megacrysts worldwide".INTERNATIONAL GEOLOGY REVIEW (2019):17.