Making Cratonic Lithospheric Mantle

doi:10.1029/2018JB016179

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

	Making Cratonic Lithospheric Mantle
	Su, Bin 1; Chen, Yi 1,2,3
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
	2018-09-01
卷号	123 期号:9 页码:7688-7706
关键词	cratonic mantle thermodynamic modeling garnet low-pressure melting mid-oceanic ridge suprasubduction zone
ISSN号	2169-9313
DOI	10.1029/2018JB016179
英文摘要	The origin of cratonic lithospheric mantle has been attributed to either high-pressure (5-7GPa) melting in hot mantle plumes or low-pressure (<5GPa) melting in mid-ocean ridges or suprasubduction zones. To resolve this long-standing debate, it is necessary to confirm under what depths the incipient cratonic mantle melted. Compared with most cratonic mantle xenoliths and xenocrysts, which commonly experienced metasomatic modification after melt extraction, diamond inclusions with predominantly harzburgitic compositions can better track the compositional signature of pristine cratonic mantle. This paper presents thermodynamic calculations performed with THERMOCALC software to establish a quantitative relationship between garnet and cratonic peridotite compositions. Along the normal cratonic geotherm (40mW/m(2)), the X-Ca [atomic Ca/(Ca+Mg+Fe2+)] and Cr# [atomic Cr/(Cr+Al)x100] values in garnet depend mainly on the bulk CaO/Al2O3 and Cr# values, respectively. Furthermore, mantle melting modeling shows that the Cr# of the residue displays a negative correlation with melting pressure at melt fractions of greater than similar to 15%. Therefore, the high Cr# values (mostly 12-36) of global garnet inclusions in diamond support a low-pressure (<4GPa) origin for cratonic lithospheric mantle. More importantly, the incipient cratonic mantle calculated from the garnet inclusions exhibits similar bulk CaO/Al2O3 and Cr# compositions to oceanic lithosphere but different values from arc lithosphere with higher CaO/Al2O3 and Cr# values. These results imply that cratonic mantle was initially formed by the extensive melting of hot ambient mantle in the Archean ocean ridge environments. The shallow oceanic lithosphere was subsequently stacked to generate the thick and stable cratonic lithospheric mantle.
资助项目	National Science Foundation of China[41490614] ; National Science Foundation of China[41822202] ; National Basic Research Program of China (973 Program)[2015CB856103] ; National Postdoctoral Program for Innovative Talents[BX201700239] ; China Postdoctoral Science Foundation[2017M620065]
WOS关键词	MID-ATLANTIC RIDGE ; HIGHLY DEPLETED PERIDOTITES ; TRACE-ELEMENT COMPOSITIONS ; LEKA OPHIOLITE COMPLEX ; HIGH-CR CHROMITITES ; MARIANA FORE-ARC ; RE-OS ISOTOPE ; KAAPVAAL CRATON ; ABYSSAL PERIDOTITES ; OXIDATION-STATE
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000447858800028
资助机构	National Science Foundation of China ; National Science Foundation of China ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Science Foundation of China ; National Science Foundation of China ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Science Foundation of China ; National Science Foundation of China ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Science Foundation of China ; National Science Foundation of China ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; National Postdoctoral Program for Innovative Talents ; National Postdoctoral Program for Innovative Talents ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/89144]
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	Chen, Yi
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China 2.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China 3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Su, Bin,Chen, Yi. Making Cratonic Lithospheric Mantle[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2018,123(9):7688-7706.
APA	Su, Bin,&Chen, Yi.(2018).Making Cratonic Lithospheric Mantle.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,123(9),7688-7706.
MLA	Su, Bin,et al."Making Cratonic Lithospheric Mantle".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 123.9(2018):7688-7706.