TY - JOUR

T1 - Carbon Isotope Composition of Diamond Crystals Grown Via Redox Mechanism

AU - Reutsky, V. N.

AU - Palyanov, Yu N.

AU - Wiedenbeck, M.

PY - 2018/12/1

Y1 - 2018/12/1

N2 - We report the carbon isotope compositions of a set of diamond crystals recovered from an investigation of the experimental interaction of metal iron with Mg–Ca carbonate at high temperature and high pressure. Despite using single carbon source with δ 13 C equal to +0.2‰ VPDB, the diamond crystals show a range of δ 13 C values from –0.5 to –17.1‰ VPDB. Diamonds grown in the metal-rich part of the system are relatively constant in their carbon isotope compositions (from –0.5 to –6.2‰), whereas those diamonds recovered from the carbonate dominated part of the capsule show a much wider range of δ 13 C (from –0.5 to –17.1‰). The experimentally observed distribution of diamond’ δ 13 C using a single carbon source with carbon isotope ratio of marine carbonate is similar to that found in certain classes of natural diamonds. Our data indicate that the δ 13 C distribution in diamonds that resulted from a redox reaction of marine carbonate with reduced mantle material is hardly distinguishable from the δ 13 C distribution of mantle diamonds.

AB - We report the carbon isotope compositions of a set of diamond crystals recovered from an investigation of the experimental interaction of metal iron with Mg–Ca carbonate at high temperature and high pressure. Despite using single carbon source with δ 13 C equal to +0.2‰ VPDB, the diamond crystals show a range of δ 13 C values from –0.5 to –17.1‰ VPDB. Diamonds grown in the metal-rich part of the system are relatively constant in their carbon isotope compositions (from –0.5 to –6.2‰), whereas those diamonds recovered from the carbonate dominated part of the capsule show a much wider range of δ 13 C (from –0.5 to –17.1‰). The experimentally observed distribution of diamond’ δ 13 C using a single carbon source with carbon isotope ratio of marine carbonate is similar to that found in certain classes of natural diamonds. Our data indicate that the δ 13 C distribution in diamonds that resulted from a redox reaction of marine carbonate with reduced mantle material is hardly distinguishable from the δ 13 C distribution of mantle diamonds.

KW - carbon isotopes

KW - diamond

KW - experiment

KW - fractionation

KW - redox crystallization

KW - SIMS

KW - subduction

KW - CRYSTALLIZATION

KW - HIGH-PRESSURE

KW - FRACTIONATION

KW - ECLOGITES

KW - MANTLE

UR - http://www.scopus.com/inward/record.url?scp=85059347141&partnerID=8YFLogxK

U2 - 10.1134/S0016702918130074

DO - 10.1134/S0016702918130074

M3 - Article

AN - SCOPUS:85059347141

VL - 56

SP - 1398

EP - 1404

JO - Geochemistry International

JF - Geochemistry International

SN - 0016-7029

IS - 13

ER -