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Effects of multi-stage rifting and metasomatism on HSE-Os-187/Os-188 systematics of the cratonic mantle beneath SW Greenland
Aulbach, Sonja1; Sun, Jing2; Tappe, Sebastian3; Gerdes, Axel1
2019-02-01
Source PublicationCONTRIBUTIONS TO MINERALOGY AND PETROLOGY
ISSN0010-7999
Volume174Issue:2Pages:23
AbstractWe report highly siderophile element (HSE) abundances and Re-Os isotope compositions, obtained by isotope dilution inductively coupled plasma mass spectrometry, of olivine separates from a suite of multiply metasomatised peridotite xenoliths entrained in kimberlites from SW Greenland. Combined with petrographic and compositional observations on accessory base metal sulphides (BMS), the results reveal new insights into the chemical, physical and mineralogical effects of multi-stage rifting and associated melt percolation on the Archaean lithospheric mantle. Refertilised lherzolites are dominated by rare to frequent small (tens of mu m) BMS inclusions in olivine, whereas modally metasomatised phlogopite-bearing lherzolite and wehrlites have higher proportions of more Ni-rich BMS, including abundant large interstitial grains (hundreds of mu m). The olivine separates display depleted HSE systematics with Primitive Upper Mantle (PUM)-normalised Pd/Ir of 0.014-0.62, and have both depleted and enriched Os-187/Os-188 (0.1139-0.2724) relative to chondrite that are not correlated with Re-187/Os-188. Four out of ten olivine separates retain similarly depleted Os corresponding to Re-depletion model ages of 2.1-1.8Ga. They may reflect Palaeoproterozoic refertilisation (lherzolitisation) during Laurentia plate assembly, with re-introduction of clinopyroxene and Os-rich BMS into the originally refractory mantle lithosphere by asthenosphere-derived basaltic melts, followed by recrystallisation and occlusion in olivine. Unradiogenic Os is observed regardless of lithology, including from peridotites that contain abundant interstitial BMS. This reflects addition of Os-poor BMS (<<1ppm) during more recent wehrlitisation and phlogopite-introduction, and control of the Os isotopic signature by older Os-rich BMS that precipitated from the basaltic melt. Depletions in compatible HSE (<0.5xPUM for Ru, Ir, Os) in all but one olivine separate reflect nugget effects (amount of depleted vs. metasomatic BMS inclusions) and/or loss due to sulphide dissolution into oxidising small-volume melts that invaded the lithosphere during recurrent rifting, the latter supported by similar depletions in published bulk peridotite data. Combined, these multiple metasomatic events destroyed all vestiges of Mesoarchaean or older inheritance in the olivine separates investigated here, and highlight that caution is needed when interpreting Proterozoic Os model ages in terms of Proterozoic lithosphere stabilisation.
KeywordSubcontinental lithosphere Mantle metasomatism Platinum-group elements Highly siderophile elements Base metal sulphides
DOI10.1007/s00410-019-1549-7
Funding OrganizationGerman Research Foundation (DFG) ; German Research Foundation (DFG) ; German Academic Exchange Service (DAAD) ; German Academic Exchange Service (DAAD) ; Geological Survey of Denmark and Greenland ; Geological Survey of Denmark and Greenland ; DST-NRF CIMERA Centre of Excellence at the University of Johannesburg, South Africa ; DST-NRF CIMERA Centre of Excellence at the University of Johannesburg, South Africa ; German Research Foundation (DFG) ; German Research Foundation (DFG) ; German Academic Exchange Service (DAAD) ; German Academic Exchange Service (DAAD) ; Geological Survey of Denmark and Greenland ; Geological Survey of Denmark and Greenland ; DST-NRF CIMERA Centre of Excellence at the University of Johannesburg, South Africa ; DST-NRF CIMERA Centre of Excellence at the University of Johannesburg, South Africa ; German Research Foundation (DFG) ; German Research Foundation (DFG) ; German Academic Exchange Service (DAAD) ; German Academic Exchange Service (DAAD) ; Geological Survey of Denmark and Greenland ; Geological Survey of Denmark and Greenland ; DST-NRF CIMERA Centre of Excellence at the University of Johannesburg, South Africa ; DST-NRF CIMERA Centre of Excellence at the University of Johannesburg, South Africa ; German Research Foundation (DFG) ; German Research Foundation (DFG) ; German Academic Exchange Service (DAAD) ; German Academic Exchange Service (DAAD) ; Geological Survey of Denmark and Greenland ; Geological Survey of Denmark and Greenland ; DST-NRF CIMERA Centre of Excellence at the University of Johannesburg, South Africa ; DST-NRF CIMERA Centre of Excellence at the University of Johannesburg, South Africa
WOS KeywordPLATINUM-GROUP ELEMENTS ; HIGHLY SIDEROPHILE ELEMENTS ; NORTH-ATLANTIC CRATON ; VOLATILE-RICH METASOMATISM ; LITHOSPHERIC MANTLE ; WEST GREENLAND ; RE-OS ; ISOTOPIC COMPOSITIONS ; PERIDOTITE XENOLITHS ; SULFIDE SATURATION
Language英语
Funding ProjectGerman Research Foundation (DFG)[GE1152/9] ; German Academic Exchange Service (DAAD) ; Geological Survey of Denmark and Greenland ; DST-NRF CIMERA Centre of Excellence at the University of Johannesburg, South Africa
Funding OrganizationGerman Research Foundation (DFG) ; German Research Foundation (DFG) ; German Academic Exchange Service (DAAD) ; German Academic Exchange Service (DAAD) ; Geological Survey of Denmark and Greenland ; Geological Survey of Denmark and Greenland ; DST-NRF CIMERA Centre of Excellence at the University of Johannesburg, South Africa ; DST-NRF CIMERA Centre of Excellence at the University of Johannesburg, South Africa ; German Research Foundation (DFG) ; German Research Foundation (DFG) ; German Academic Exchange Service (DAAD) ; German Academic Exchange Service (DAAD) ; Geological Survey of Denmark and Greenland ; Geological Survey of Denmark and Greenland ; DST-NRF CIMERA Centre of Excellence at the University of Johannesburg, South Africa ; DST-NRF CIMERA Centre of Excellence at the University of Johannesburg, South Africa ; German Research Foundation (DFG) ; German Research Foundation (DFG) ; German Academic Exchange Service (DAAD) ; German Academic Exchange Service (DAAD) ; Geological Survey of Denmark and Greenland ; Geological Survey of Denmark and Greenland ; DST-NRF CIMERA Centre of Excellence at the University of Johannesburg, South Africa ; DST-NRF CIMERA Centre of Excellence at the University of Johannesburg, South Africa ; German Research Foundation (DFG) ; German Research Foundation (DFG) ; German Academic Exchange Service (DAAD) ; German Academic Exchange Service (DAAD) ; Geological Survey of Denmark and Greenland ; Geological Survey of Denmark and Greenland ; DST-NRF CIMERA Centre of Excellence at the University of Johannesburg, South Africa ; DST-NRF CIMERA Centre of Excellence at the University of Johannesburg, South Africa
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000457712600002
PublisherSPRINGER
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90521
Collection岩石圈演化国家重点实验室
Corresponding AuthorAulbach, Sonja
Affiliation1.Goethe Univ, Inst Geowissensch, Altenhoferallee 1, D-60438 Frankfurt, Germany
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Univ Johannesburg, Dept Geol, POB 524, ZA-2006 Auckland Pk, South Africa
Recommended Citation
GB/T 7714
Aulbach, Sonja,Sun, Jing,Tappe, Sebastian,et al. Effects of multi-stage rifting and metasomatism on HSE-Os-187/Os-188 systematics of the cratonic mantle beneath SW Greenland[J]. CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,2019,174(2):23.
APA Aulbach, Sonja,Sun, Jing,Tappe, Sebastian,&Gerdes, Axel.(2019).Effects of multi-stage rifting and metasomatism on HSE-Os-187/Os-188 systematics of the cratonic mantle beneath SW Greenland.CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,174(2),23.
MLA Aulbach, Sonja,et al."Effects of multi-stage rifting and metasomatism on HSE-Os-187/Os-188 systematics of the cratonic mantle beneath SW Greenland".CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 174.2(2019):23.
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