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)
文献类型：期刊论文
| 作者 | Castillo-Oliver, Montgarri2,3,9; Giuliani, Andrea1,2,3,10; Griffin, William L.2,3; O'Reilly, Suzanne Y.2,3; Drysdale, Russell N.8,9; Abersteiner, Adam6,7; Thomassot, Emilie5,10; Li, Xian-Hua4 |
| 刊名 | CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
 |
| 出版日期 | 2020-03-19 |
| 卷号 | 175期号:4页码:20 |
| 关键词 | In situ C-O-Sr isotopes Primary kimberlitic carbonates Deep mantle carbon Petrography Carbonate petrogenesis SIMS |
| ISSN号 | 0010-7999 |
| DOI | 10.1007/s00410-020-1662-7 |
| 英文摘要 | Primary 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. |
| WOS关键词 | HYPABYSSAL KIMBERLITE ; CRUSTAL CONTAMINATION ; NORTHWEST-TERRITORIES ; OXIDE MINERALS ; CANARY-ISLANDS ; TRACE-ELEMENTS ; MANTLE ; OXYGEN ; ND ; PB |
| 资助项目 | Australian 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 |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000520705600001 |
| 出版者 | SPRINGER |
| 资助机构 | 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 ; 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 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/95511]  |
| 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 | Castillo-Oliver, Montgarri |
| 作者单位 | 1.Univ Melbourne, Sch Earth Sci, KiDs Kimberlites & Diamonds, Parkville, Vic 3010, Australia 2.Macquarie Univ, GEMOC, Dept Earth & Planetary Sci, Macquarie Park, NSW 2109, Australia 3.Macquarie Univ, ARC Ctr Excellence Core Crust Fluid Syst CCFS, Macquarie Park, NSW 2109, Australia 4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China 5.Univ Lorraine, CNRS, CRPG, Nancy, France 6.Russian Acad Sci, Inst Volcanol & Seismol, Far Eastern Branch, Petropavlovsk Kamchatski, Russia 7.Univ Tasmania, Sch Nat Sci, Hobart, Tas, Australia 8.Univ Savoie Mt Blanc, Lab EDYTEM, UMR 5204, CNRS, F-73376 Chambery, Le Bourget Du L, France 9.Univ Melbourne, Sch Geog, Parkville, Vic 3010, Australia 10.Swiss Fed Inst Technol, Inst Geochem & Petr, Dept Earth Sci, Clausiusstr 25, CH-8092 Zurich, Switzerland |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：地质与地球物理研究所
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