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Making Cratonic Lithospheric Mantle

文献类型：期刊论文

作者Su, Bin1; Chen, Yi1,2,3
刊名JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
出版日期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
DOI10.1029/2018JB016179
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.
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
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研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000447858800028
出版者AMER GEOPHYSICAL UNION
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
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.

入库方式： OAI收割

来源：地质与地球物理研究所

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