IGGCAS OpenIR  > 岩石圈演化国家重点实验室
New constraints on the source, composition, and post-emplacement modification of kimberlites from in situ C-O-Sr-isotope analyses of carbonates from the Benfontein sills (South Africa)
Castillo-Oliver, Montgarri1,2,5; Giuliani, Andrea1,2,3,4; Griffin, William L.1,2; O'Reilly, Suzanne Y.1,2; Drysdale, Russell N.5,6; Abersteiner, Adam7,8; Thomassot, Emilie4,9; Li, Xian-Hua10
2020-03-19
Source PublicationCONTRIBUTIONS TO MINERALOGY AND PETROLOGY
ISSN0010-7999
Volume175Issue:4Pages:20
AbstractPrimary carbonates in kimberlites are the main CO2 carriers in kimberlites and thus can be used to constrain the original carbon and oxygen-isotope composition of kimberlite melts and their deep mantle sources. However, the contribution of syn- and post-emplacement processes to the modification of the C-O-isotope composition of kimberlites is yet to be fully constrained. This study aims to shed new light on this topic through a detailed textural, compositional (major and trace elements), and in situ C-O-Sr isotopic characterisation of carbonates in the Benfontein kimberlite sills (Kimberley, South Africa). Our multi-technique approach not only reveals the petrographic and geochemical complexity of carbonates in kimberlites in unprecedented detail, but also allows identification of the processes that led to their formation, including: (1) magmatic crystallisation of Sr-rich calcite laths and groundmass; (2) crystallisation of late groundmass calcite from hydrothermal fluids; and (3) variable degrees of crustal contamination in carbonate-rich diapirs and secondary veins. These diapirs most likely resulted from a residual C-O-H fluid or carbonate melt with contributions from methane-rich fluids from the Dwyka shale wall rock, leading to higher Sr-87/Sr-86 and delta O-18, but lower delta C-13 values than in pristine magmatic calcite. Before coalescing into the diapiric segregations, these fluids/melts also variably entrained early formed calcite laths and groundmass phases. Comparison between in situ and bulk-carbonate analyses confirms that O isotopic analyses of bulk carbonates from kimberlite rocks are not representative of the original isotopic signature of the kimberlite magma, whereas bulk C-isotope compositions are similar to those of the pristine magmatic carbonates. Calcite laths and most groundmass grains at Benfontein preserve isotopic values (delta O-18 = 6-8 parts per thousand and delta C-13 = - 4 to - 6 parts per thousand), similar to those of unaltered carbonatites worldwide, which, therefore, probably correspond to those of their parental melts. This narrow range suggests kimberlite derivation from a mantle source with little contribution from recycled crustal material unless the recycled material had isotopic composition indistinguishable from typical mantle values.
KeywordIn situ C-O-Sr isotopes Primary kimberlitic carbonates Deep mantle carbon Petrography Carbonate petrogenesis SIMS
DOI10.1007/s00410-020-1662-7
Funding OrganizationAustralian Research Council ; Australian Research Council ; Swiss National Science Foundation ; Swiss National Science Foundation ; European Science Foundation-Europlanet 2020 Consortium ; European Science Foundation-Europlanet 2020 Consortium ; ARC Centre of Excellence for Core to Crust Fluid Systems ; ARC Centre of Excellence for Core to Crust Fluid Systems ; ARC Linkage Infrastructure, Equipment and Facilities (LIEF) ; ARC Linkage Infrastructure, Equipment and Facilities (LIEF) ; Department of Education, Science and Training (DEST) Systemic Infrastructure Grants, Macquarie University, National Collaborative Research Infrastructure Scheme (NCRIS) AuScope and Industry ; Department of Education, Science and Training (DEST) Systemic Infrastructure Grants, Macquarie University, National Collaborative Research Infrastructure Scheme (NCRIS) AuScope and Industry ; Australian Research Council ; Australian Research Council ; Swiss National Science Foundation ; Swiss National Science Foundation ; European Science Foundation-Europlanet 2020 Consortium ; European Science Foundation-Europlanet 2020 Consortium ; ARC Centre of Excellence for Core to Crust Fluid Systems ; ARC Centre of Excellence for Core to Crust Fluid Systems ; ARC Linkage Infrastructure, Equipment and Facilities (LIEF) ; ARC Linkage Infrastructure, Equipment and Facilities (LIEF) ; Department of Education, Science and Training (DEST) Systemic Infrastructure Grants, Macquarie University, National Collaborative Research Infrastructure Scheme (NCRIS) AuScope and Industry ; Department of Education, Science and Training (DEST) Systemic Infrastructure Grants, Macquarie University, National Collaborative Research Infrastructure Scheme (NCRIS) AuScope and Industry ; Australian Research Council ; Australian Research Council ; Swiss National Science Foundation ; Swiss National Science Foundation ; European Science Foundation-Europlanet 2020 Consortium ; European Science Foundation-Europlanet 2020 Consortium ; ARC Centre of Excellence for Core to Crust Fluid Systems ; ARC Centre of Excellence for Core to Crust Fluid Systems ; ARC Linkage Infrastructure, Equipment and Facilities (LIEF) ; ARC Linkage Infrastructure, Equipment and Facilities (LIEF) ; Department of Education, Science and Training (DEST) Systemic Infrastructure Grants, Macquarie University, National Collaborative Research Infrastructure Scheme (NCRIS) AuScope and Industry ; Department of Education, Science and Training (DEST) Systemic Infrastructure Grants, Macquarie University, National Collaborative Research Infrastructure Scheme (NCRIS) AuScope and Industry ; Australian Research Council ; Australian Research Council ; Swiss National Science Foundation ; Swiss National Science Foundation ; European Science Foundation-Europlanet 2020 Consortium ; European Science Foundation-Europlanet 2020 Consortium ; ARC Centre of Excellence for Core to Crust Fluid Systems ; ARC Centre of Excellence for Core to Crust Fluid Systems ; ARC Linkage Infrastructure, Equipment and Facilities (LIEF) ; ARC Linkage Infrastructure, Equipment and Facilities (LIEF) ; Department of Education, Science and Training (DEST) Systemic Infrastructure Grants, Macquarie University, National Collaborative Research Infrastructure Scheme (NCRIS) AuScope and Industry ; Department of Education, Science and Training (DEST) Systemic Infrastructure Grants, Macquarie University, National Collaborative Research Infrastructure Scheme (NCRIS) AuScope and Industry
WOS KeywordHYPABYSSAL KIMBERLITE ; CRUSTAL CONTAMINATION ; NORTHWEST-TERRITORIES ; OXIDE MINERALS ; CANARY-ISLANDS ; TRACE-ELEMENTS ; MANTLE ; OXYGEN ; ND ; PB
Language英语
Funding ProjectAustralian Research Council[DE-150100009] ; Swiss National Science Foundation[PZ00P2_180126/1] ; European Science Foundation-Europlanet 2020 Consortium[16-EPN2-017] ; ARC Centre of Excellence for Core to Crust Fluid Systems[CE110001017] ; ARC Linkage Infrastructure, Equipment and Facilities (LIEF) ; Department of Education, Science and Training (DEST) Systemic Infrastructure Grants, Macquarie University, National Collaborative Research Infrastructure Scheme (NCRIS) AuScope and Industry
Funding OrganizationAustralian Research Council ; Australian Research Council ; Swiss National Science Foundation ; Swiss National Science Foundation ; European Science Foundation-Europlanet 2020 Consortium ; European Science Foundation-Europlanet 2020 Consortium ; ARC Centre of Excellence for Core to Crust Fluid Systems ; ARC Centre of Excellence for Core to Crust Fluid Systems ; ARC Linkage Infrastructure, Equipment and Facilities (LIEF) ; ARC Linkage Infrastructure, Equipment and Facilities (LIEF) ; Department of Education, Science and Training (DEST) Systemic Infrastructure Grants, Macquarie University, National Collaborative Research Infrastructure Scheme (NCRIS) AuScope and Industry ; Department of Education, Science and Training (DEST) Systemic Infrastructure Grants, Macquarie University, National Collaborative Research Infrastructure Scheme (NCRIS) AuScope and Industry ; Australian Research Council ; Australian Research Council ; Swiss National Science Foundation ; Swiss National Science Foundation ; European Science Foundation-Europlanet 2020 Consortium ; European Science Foundation-Europlanet 2020 Consortium ; ARC Centre of Excellence for Core to Crust Fluid Systems ; ARC Centre of Excellence for Core to Crust Fluid Systems ; ARC Linkage Infrastructure, Equipment and Facilities (LIEF) ; ARC Linkage Infrastructure, Equipment and Facilities (LIEF) ; Department of Education, Science and Training (DEST) Systemic Infrastructure Grants, Macquarie University, National Collaborative Research Infrastructure Scheme (NCRIS) AuScope and Industry ; Department of Education, Science and Training (DEST) Systemic Infrastructure Grants, Macquarie University, National Collaborative Research Infrastructure Scheme (NCRIS) AuScope and Industry ; Australian Research Council ; Australian Research Council ; Swiss National Science Foundation ; Swiss National Science Foundation ; European Science Foundation-Europlanet 2020 Consortium ; European Science Foundation-Europlanet 2020 Consortium ; ARC Centre of Excellence for Core to Crust Fluid Systems ; ARC Centre of Excellence for Core to Crust Fluid Systems ; ARC Linkage Infrastructure, Equipment and Facilities (LIEF) ; ARC Linkage Infrastructure, Equipment and Facilities (LIEF) ; Department of Education, Science and Training (DEST) Systemic Infrastructure Grants, Macquarie University, National Collaborative Research Infrastructure Scheme (NCRIS) AuScope and Industry ; Department of Education, Science and Training (DEST) Systemic Infrastructure Grants, Macquarie University, National Collaborative Research Infrastructure Scheme (NCRIS) AuScope and Industry ; Australian Research Council ; Australian Research Council ; Swiss National Science Foundation ; Swiss National Science Foundation ; European Science Foundation-Europlanet 2020 Consortium ; European Science Foundation-Europlanet 2020 Consortium ; ARC Centre of Excellence for Core to Crust Fluid Systems ; ARC Centre of Excellence for Core to Crust Fluid Systems ; ARC Linkage Infrastructure, Equipment and Facilities (LIEF) ; ARC Linkage Infrastructure, Equipment and Facilities (LIEF) ; Department of Education, Science and Training (DEST) Systemic Infrastructure Grants, Macquarie University, National Collaborative Research Infrastructure Scheme (NCRIS) AuScope and Industry ; Department of Education, Science and Training (DEST) Systemic Infrastructure Grants, Macquarie University, National Collaborative Research Infrastructure Scheme (NCRIS) AuScope and Industry
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000520705600001
PublisherSPRINGER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95511
Collection岩石圈演化国家重点实验室
Corresponding AuthorCastillo-Oliver, Montgarri
Affiliation1.Macquarie Univ, ARC Ctr Excellence Core Crust Fluid Syst CCFS, Macquarie Park, NSW 2109, Australia
2.Macquarie Univ, GEMOC, Dept Earth & Planetary Sci, Macquarie Park, NSW 2109, Australia
3.Univ Melbourne, Sch Earth Sci, KiDs Kimberlites & Diamonds, Parkville, Vic 3010, Australia
4.Swiss Fed Inst Technol, Inst Geochem & Petr, Dept Earth Sci, Clausiusstr 25, CH-8092 Zurich, Switzerland
5.Univ Melbourne, Sch Geog, Parkville, Vic 3010, Australia
6.Univ Savoie Mt Blanc, Lab EDYTEM, UMR 5204, CNRS, F-73376 Chambery, Le Bourget Du L, France
7.Univ Tasmania, Sch Nat Sci, Hobart, Tas, Australia
8.Russian Acad Sci, Inst Volcanol & Seismol, Far Eastern Branch, Petropavlovsk Kamchatski, Russia
9.Univ Lorraine, CNRS, CRPG, Nancy, France
10.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Castillo-Oliver, Montgarri,Giuliani, Andrea,Griffin, William L.,et al. New constraints on the source, composition, and post-emplacement modification of kimberlites from in situ C-O-Sr-isotope analyses of carbonates from the Benfontein sills (South Africa)[J]. CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,2020,175(4):20.
APA Castillo-Oliver, Montgarri.,Giuliani, Andrea.,Griffin, William L..,O'Reilly, Suzanne Y..,Drysdale, Russell N..,...&Li, Xian-Hua.(2020).New constraints on the source, composition, and post-emplacement modification of kimberlites from in situ C-O-Sr-isotope analyses of carbonates from the Benfontein sills (South Africa).CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,175(4),20.
MLA Castillo-Oliver, Montgarri,et al."New constraints on the source, composition, and post-emplacement modification of kimberlites from in situ C-O-Sr-isotope analyses of carbonates from the Benfontein sills (South Africa)".CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 175.4(2020):20.
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