Diamonds from Dachine, French Guiana: A unique record of early Proterozoic subduction

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• 作者：Chris B. Smith^a ; Michael J. Walter^a ; ^{m.j.walter@bristol.ac.uk} ; Galina P. Bulanova^a ; Sami Mikhail^a ; ^b ; Antony D. Burnham^a ; ^c ; Luiz Gobbo^d ; Simon C. Kohn^a
• 关键词：Dachine ; Diamond ; Inclusions ; Subduction ; Isotopes
• 刊名：Lithos
• 出版年：2016
• 出版时间：15 November 2016
• 年：2016
• 卷：265
• 期：Complete
• 页码：82-95
• 全文大小：1644 K
• 卷排序：265

文摘

Dachine diamonds have C and N isotopic compositions indicating a sedimentary source. Disaggregated nitrogen defects severely limit diamond residence time in the mantle. Garnet and clinopyroxene inclusions are eclogitic and indicate a metal-rich source. Inclusion and xenocryst thermobarometry indicates formation at ~ 200–250 km depth. We suggest a model for diamond growth at the slab–mantle interface in a subduction zone.