Modelling the partial melting of metasediments in a low-pressure regional contact aureole: the effect of water and whole-rock composition

doi:10.1017/S001675681800078X

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

	Modelling the partial melting of metasediments in a low-pressure regional contact aureole: the effect of water and whole-rock composition
	Wang, Wei-R Z.1,2,3; Clarke, Geoffrey 2; Daczko, Nathan R.4; Zhao, Yue 1
刊名	GEOLOGICAL MAGAZINE
	2019-08-01
卷号	156 期号:8 页码:1400-1424
关键词	melt productivity and composition water content residuum migmatite
ISSN号	0016-7568
DOI	10.1017/S001675681800078X
英文摘要	Low-pressure regional aureoles with steep metamorphic field gradients are critical to understanding progressive metamorphism in high-temperature metasedimentary rocks. Delicately layered pelitic and psammitic metasedimentary rocks at Mt Stafford, central Australia, record a greenschist- to granulite-facies Palaeoproterozoic regional aureole, associated with S-type granite plutons, reflecting metamorphism in the range 500-800 degrees C and at similar to 3 kbar. The rocks experienced minimal deformation during metamorphism and partial melting. Partial melting textures evolve progressively along the steep metamorphic field gradient from the incipient stages of melting marked by cuspate grains with low dihedral angles, to melt proportions sufficient to form diatexite with schollen. Phase equilibria modelling in the NCKFMASHTO system for pelitic, semi-pelitic and high- and low-ferromagnesian psammitic samples quantitatively illustrates the dependence of partial melting on rock composition and water volume. Pelitic compositions are more fertile than psammitic compositions when the water content in the rocks is low, especially during the early stages of melting. The whole-rock ferromagnesian component additionally influences melt fertility, with ferromagnesian-rich psammite being more fertile than psammite with a lower ferromagnesian component. Subtle variations in free water content can result in obvious changes in melt volume but limited variation in melt composition. Distinct melting histories of pelitic and psammitic rocks inferred from field relationships may be partially attributed to potential differences in water volume retained to super-solidus conditions. Melt composition is more dependent on the rock composition than the variation in water content.
资助项目	ARC[DP160103449] ; University of Sydney ; National Natural Science Foundation of China[41672062] ; National Natural Science Foundation of China[41202047] ; National Natural Science Foundation of China[41502059] ; Fundamental Research Funds of CAGS[JYYWF201819] ; University of Sydney International Postgraduate Award ; Macquarie University ; ARC LIEF ; DEST Systemic Infrastructure Grants, Macquarie University and Industry
WOS关键词	WONGWIBINDA METAMORPHIC COMPLEX ; MINERAL EQUILIBRIA CALCULATIONS ; HIGH-GRADE METAMORPHISM ; NEW-ENGLAND OROGEN ; LOW-P METAMORPHISM ; MT STAFFORD ; CONTINENTAL-CRUST ; CENTRAL AUSTRALIA ; PHASE-EQUILIBRIA ; SHEAR ZONE
WOS研究方向	Geology
语种	英语
出版者	CAMBRIDGE UNIV PRESS
WOS记录号	WOS:000475939700008
资助机构	ARC ; ARC ; University of Sydney ; University of Sydney ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds of CAGS ; Fundamental Research Funds of CAGS ; University of Sydney International Postgraduate Award ; University of Sydney International Postgraduate Award ; Macquarie University ; Macquarie University ; ARC LIEF ; ARC LIEF ; DEST Systemic Infrastructure Grants, Macquarie University and Industry ; DEST Systemic Infrastructure Grants, Macquarie University and Industry ; ARC ; ARC ; University of Sydney ; University of Sydney ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds of CAGS ; Fundamental Research Funds of CAGS ; University of Sydney International Postgraduate Award ; University of Sydney International Postgraduate Award ; Macquarie University ; Macquarie University ; ARC LIEF ; ARC LIEF ; DEST Systemic Infrastructure Grants, Macquarie University and Industry ; DEST Systemic Infrastructure Grants, Macquarie University and Industry ; ARC ; ARC ; University of Sydney ; University of Sydney ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds of CAGS ; Fundamental Research Funds of CAGS ; University of Sydney International Postgraduate Award ; University of Sydney International Postgraduate Award ; Macquarie University ; Macquarie University ; ARC LIEF ; ARC LIEF ; DEST Systemic Infrastructure Grants, Macquarie University and Industry ; DEST Systemic Infrastructure Grants, Macquarie University and Industry ; ARC ; ARC ; University of Sydney ; University of Sydney ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds of CAGS ; Fundamental Research Funds of CAGS ; University of Sydney International Postgraduate Award ; University of Sydney International Postgraduate Award ; Macquarie University ; Macquarie University ; ARC LIEF ; ARC LIEF ; DEST Systemic Infrastructure Grants, Macquarie University and Industry ; DEST Systemic Infrastructure Grants, Macquarie University and Industry
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/92926]
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	Wang, Wei-R Z.
作者单位	1.Chinese Acad Geosci, Inst Geomech, Beijing 100081, Peoples R China 2.Univ Sydney, Sch Geosci, F09, Sydney, NSW 2006, Australia 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 4.Macquarie Univ, GEMOC ARC Natl Key Ctr, Dept Earth & Planetary Sci, N Ryde, NSW 2109, Australia
推荐引用方式 GB/T 7714	Wang, Wei-R Z.,Clarke, Geoffrey,Daczko, Nathan R.,et al. Modelling the partial melting of metasediments in a low-pressure regional contact aureole: the effect of water and whole-rock composition[J]. GEOLOGICAL MAGAZINE,2019,156(8):1400-1424.
APA	Wang, Wei-R Z.,Clarke, Geoffrey,Daczko, Nathan R.,&Zhao, Yue.(2019).Modelling the partial melting of metasediments in a low-pressure regional contact aureole: the effect of water and whole-rock composition.GEOLOGICAL MAGAZINE,156(8),1400-1424.
MLA	Wang, Wei-R Z.,et al."Modelling the partial melting of metasediments in a low-pressure regional contact aureole: the effect of water and whole-rock composition".GEOLOGICAL MAGAZINE 156.8(2019):1400-1424.