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Diamonds from New Caledonia forearc ophiolite record recycling of subducted organic carbon

Earth and planetary science letters, 2024 [Peer Reviewed Journal]

Distributed under a Creative Commons Attribution 4.0 International License ;ISSN: 0012-821X ;EISSN: 1385-013X

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  • Title:
    Diamonds from New Caledonia forearc ophiolite record recycling of subducted organic carbon
  • Author: Aitchison, Jonathan C ; Patias, Daniel ; Cluzel, Dominique ; Ireland, Trevor ; Zhou, Renjie ; Lian, Dongyang ; Jingsui, Yang
  • Subjects: Environmental Sciences
  • Is Part Of: Earth and planetary science letters, 2024
  • Description: Micro-diamonds and moissanite (SiC) are reported from ophiolitic mantle harzburgite and chromitite of the New Caledonian Peridotite Nappe. This, the first Southern Hemisphere discovery of such minerals in forearc mantle rocks supports their global distribution amongst supra-subduction zone (SSZ) ophiolites. Highly distinctive uniformly strong negative δ 13 C values for the micro-diamonds and accompanying moissanite fingerprint an organically fractionated source, likely related to biochemical processes at Earth's surface. Results of the U-Pb system, which has a closure temperature of 620 ± 20°C, for co-occurring rutile xenocrysts provide constraints on maximum temperature conditions experienced. These maximum temperatures suggest that the New Caledonian diamonds appear to have neither experienced nor required a growth environment involving deep mantle conditions normally invoked for 'typical' diamond paragenesis. As such, they represent an association specifically related to SSZ forearc ophiolites. Their occurrence together with moissanite potentially indicates genesis amongst anoxic sediments rich in organic carbon at the top of the subducting slab and/or in the subduction channel under localised super-reducing conditions. This is an important but little-recognised feature of the global carbon cycle applicable to SSZ forearc ophiolites worldwide.
  • Publisher: Elsevier
  • Language: English
  • Identifier: ISSN: 0012-821X
    EISSN: 1385-013X
  • Source: Hyper Article en Ligne (HAL) (Open Access)
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