Unravelling the complexity of magma plumbing at Mount St. Helens: a new trace element partitioning scheme for amphibole

doi:10.1007/s00410-018-1543-5

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

	Unravelling the complexity of magma plumbing at Mount St. Helens: a new trace element partitioning scheme for amphibole
	Humphreys, Madeleine C. S.1; Cooper, George F.1; Zhang, Jing 1,2; Loewen, Matthew 3,4; Kent, Adam J. R.3; Macpherson, Colin G.1; Davidson, Jon P.1
刊名	CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
	2019
卷号	174 期号:1 页码:15
关键词	Trace elements Partitioning Amphibole Subduction zones Mount St Helens Magma plumbing
ISSN号	0010-7999
DOI	10.1007/s00410-018-1543-5
英文摘要	Volcanoes at subduction zones reside above complex magma plumbing systems, where individual magmatic components may originate and interact at a range of pressures. Because whole-rock compositions of subduction zone magmas are the integrated result of processes operating throughout the entire plumbing system, processes such as mixing, homogenisation and magma assembly during shallow storage can overprint the chemical signatures of deeper crustal processes. Whereas melt inclusions provide an effective way to study the uppermost 10-15km of the plumbing system, challenges remain in understanding magma intrusion, fractionation and hybridisation processes in the middle to lower crust (15-30km depth), which commonly involves amphibole crystallisation. Here, we present new insights into the mid-crustal plumbing system at Mount St. Helens, USA, using multiple regression methods to calculate trace element partition coefficients for amphibole phenocrysts, and thus infer the trace element compositions of their equilibrium melts. The results indicate vertically distributed crystal fractionation, dominated by amphibole at higher pressures and in intermediate melts, and by plagioclase at lower pressures. Variations in Nb, Zr and REE concentrations at intermediate SiO2 contents suggest repeated scavenging of partially remelted intrusive material in the mid-crust, and mixing with material from geochemically diverse sources. Amphibole is an effective probe for deep crustal magmatism worldwide, and this approach offers a new tool to explore the structure and chemistry of arc magmas, including those forming plutonic or cumulate materials that offer no other constraints on melt composition.
资助项目	Durham Doctoral Studentship (Durham University) ; China Scholarship Council[201206170178] ; National Natural Science Foundation of China[41702362] ; Royal Society University Research Fellowship[UF140711] ; National Science Foundation[1425491] ; National Science Foundation[1028707] ; NERC Grant[NE/K010824/1]
WOS关键词	HIGH-FIELD-STRENGTH ; RARE-EARTH ; EXPERIMENTAL CONSTRAINTS ; PLAGIOCLASE PHENOCRYSTS ; DRIVEN CRYSTALLIZATION ; WASHINGTON CASCADES ; TITANIAN PARGASITE ; MELT ; ARC ; FRACTIONATION
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000454787300003
资助机构	Durham Doctoral Studentship (Durham University) ; Durham Doctoral Studentship (Durham University) ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Royal Society University Research Fellowship ; Royal Society University Research Fellowship ; National Science Foundation ; National Science Foundation ; NERC Grant ; NERC Grant ; Durham Doctoral Studentship (Durham University) ; Durham Doctoral Studentship (Durham University) ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Royal Society University Research Fellowship ; Royal Society University Research Fellowship ; National Science Foundation ; National Science Foundation ; NERC Grant ; NERC Grant ; Durham Doctoral Studentship (Durham University) ; Durham Doctoral Studentship (Durham University) ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Royal Society University Research Fellowship ; Royal Society University Research Fellowship ; National Science Foundation ; National Science Foundation ; NERC Grant ; NERC Grant ; Durham Doctoral Studentship (Durham University) ; Durham Doctoral Studentship (Durham University) ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Royal Society University Research Fellowship ; Royal Society University Research Fellowship ; National Science Foundation ; National Science Foundation ; NERC Grant ; NERC Grant
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/90258]
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	Humphreys, Madeleine C. S.
作者单位	1.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England 2.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97330 USA 4.US Geol Survey, Alaska Volcano Observ, Anchorage, AK 99508 USA
推荐引用方式 GB/T 7714	Humphreys, Madeleine C. S.,Cooper, George F.,Zhang, Jing,et al. Unravelling the complexity of magma plumbing at Mount St. Helens: a new trace element partitioning scheme for amphibole[J]. CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,2019,174(1):15.
APA	Humphreys, Madeleine C. S..,Cooper, George F..,Zhang, Jing.,Loewen, Matthew.,Kent, Adam J. R..,...&Davidson, Jon P..(2019).Unravelling the complexity of magma plumbing at Mount St. Helens: a new trace element partitioning scheme for amphibole.CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,174(1),15.
MLA	Humphreys, Madeleine C. S.,et al."Unravelling the complexity of magma plumbing at Mount St. Helens: a new trace element partitioning scheme for amphibole".CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 174.1(2019):15.