TY - JOUR

T1 - Carbonate–Silicate–Sulfide Polyphase Inclusion in Diamond from the Komsomolskaya Kimberlite Pipe, Yakutia

AU - Logvinova, A. M.

AU - Wirth, R.

AU - Zedgenizov, D. A.

AU - Taylor, L. A.

PY - 2018/4/1

Y1 - 2018/4/1

N2 - An aragonite inclusion in natural diamond was identified using techniques of transmission electron microscopy, electron microdiffraction, and microprobe analysis. The inclusion is hosted in a colorless octahedral diamond crystal from the Komslomolskaya pipe in Yakutia. The diamond crystal shows a zoned distribution of its admixtures and defects. The structure parameters of the inclusion (∠[001]/[201] = 66° and certain lattice spacings) correspond to the calculated parameters of the orthorhombic unit cell of a Ca carbonate polymorph. The aragonite inclusion contains admixtures of MgO (0.81), MnO (0.58), and FeO (0.13 wt %). The find of a syngenetic aragonite inclusion in diamond is unique and proves that diamond can be formed in carbonatized mantle peridotite at depths of at least 300 km. The inclusion hosts identifiable microphases of Ni-rich sulfides (37–41 wt % Ni), titanite, hydrous silicate, magnetite, and fluid. This association indicates that the diamond and aragonite crystallized from a carbonate–silicate–sulfide melt or highdensity fluid.

AB - An aragonite inclusion in natural diamond was identified using techniques of transmission electron microscopy, electron microdiffraction, and microprobe analysis. The inclusion is hosted in a colorless octahedral diamond crystal from the Komslomolskaya pipe in Yakutia. The diamond crystal shows a zoned distribution of its admixtures and defects. The structure parameters of the inclusion (∠[001]/[201] = 66° and certain lattice spacings) correspond to the calculated parameters of the orthorhombic unit cell of a Ca carbonate polymorph. The aragonite inclusion contains admixtures of MgO (0.81), MnO (0.58), and FeO (0.13 wt %). The find of a syngenetic aragonite inclusion in diamond is unique and proves that diamond can be formed in carbonatized mantle peridotite at depths of at least 300 km. The inclusion hosts identifiable microphases of Ni-rich sulfides (37–41 wt % Ni), titanite, hydrous silicate, magnetite, and fluid. This association indicates that the diamond and aragonite crystallized from a carbonate–silicate–sulfide melt or highdensity fluid.

KW - aragonite

KW - carbonates

KW - diamond

KW - fluid

KW - mantle

KW - polyphase inclusions

KW - sulfide

KW - HIGH-PRESSURE

KW - DEEP MANTLE

KW - HIGH-TEMPERATURE

KW - CACO3

KW - FLUID INCLUSIONS

KW - MINERAL INCLUSIONS

KW - MAGNESITE

KW - OCEANIC-CRUST

KW - FORMING FLUIDS

KW - ARAGONITE

UR - http://www.scopus.com/inward/record.url?scp=85044949238&partnerID=8YFLogxK

U2 - 10.1134/S0016702918040079

DO - 10.1134/S0016702918040079

M3 - Article

AN - SCOPUS:85044949238

VL - 56

SP - 283

EP - 291

JO - Geochemistry International

JF - Geochemistry International

SN - 0016-7029

IS - 4

ER -