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Title: Isotopic fractionation of oxygen and carbon in decomposed lower-mantle inclusions in diamond

Journal Article · · Mineralogy and Petrology
 [1];  [2];  [2];  [2];  [3]
  1. KM Diamond Exploration Ltd., West Vancouver, BC (Canada)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. GeoForschungsZentrum Potsdam, Potsdam (Germany)

Two carbonatitic mineral assemblages, calcite + wollastonite and calcite + monticellite, which are encapsulated in two diamond grains from the Rio Soriso basin in the Juina area, Mato Grosso State, Brazil, were studied utilizing the NanoSIMS technique. The assemblages were formed as the result of the decomposition of the lower-mantle assemblage calcite + CaSi-perovskite + volatile during the course of the diamond ascent under pressure conditions from 15 to less than 0.8 GPa. The oxygen and carbon isotopic compositions of the studied minerals are inhomogeneous. They fractionated during the process of the decomposition of primary minerals to very varying values: δ18O from –3.3 to +15.4 ‰ SMOW and δ13C from –2.8 to +9.3 ‰ VPDB. As a result, these values significantly extend the mantle values for these elements in both isotopically-light and isotopically-heavy areas.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1324510
Report Number(s):
LLNL-JRNL-701302
Journal Information:
Mineralogy and Petrology, Vol. 110, Issue 2-3; ISSN 0930-0708
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

References (35)

Zircon megacrysts from kimberlite: oxygen isotope variability among mantle melts journal October 1998
Evidence for deep mantle convection and primordial heterogeneity from nitrogen and carbon stable isotopes in diamond journal December 2012
Archean mantle heterogeneity and the origin of diamondiferous eclogites, Siberia; evidence from stable isotopes and hydroxyl in garnet journal August 1995
Methane-related diamond crystallization in the Earth's mantle: Stable isotope evidences from a single diamond-bearing xenolith journal May 2007
Mineralogy of the lower mantle: A review of ‘super-deep’ mineral inclusions in diamond journal January 2012
Oxygen isotope composition of mantle peridotite journal December 1994
Emplacement age and isotope geochemistry of Sung Valley alkaline–carbonatite complex, Shillong Plateau, northeastern India: implications for primary carbonate melt and genesis of the associated silicate rocks journal April 2005
Unusual micro- and nano-inclusions in diamonds from the Juina Area, Brazil journal August 2009
Comment on 'The Origins of Yakutian Eclogite Xenoliths' by G. A. Snyder,L. A. Taylor, G. Crozaz, A. N. Halliday, B. L. Beard, V. N. Sobolev and N. V. Sobolev journal August 1998
Nyerereite and nahcolite inclusions in diamond: evidence for lower-mantle carbonatitic magmas journal October 2009
The occurrence of cuspidine, foshagite and hillebrandite in calc-silicate xenoliths from the Bushveld Complex, South Africa. journal December 2000
Stability of (Mg0.5Fe0.5)O and (Mg0.8Fe0.2)O magnesiowustites in the lower mantle [Stability of (Mg0.5Fe0.5)O and (Mg0.8Fe0.2)O magnesiowustites in the lower mantle] journal September 2001
Diamond formation in the deep mantle: the record of mineral inclusions and their distribution in relation to mantle dehydration zones journal April 2010
Extreme crustal oxygen isotope signatures preserved in coesite in diamond journal May 2003
Stable isotope (C, O, S) compositions of volatile-rich minerals in kimberlites: A review journal May 2014
Between carbonatite and lamproite—Diamondiferous Torngat ultramafic lamprophyres formed by carbonate-fluxed melting of cratonic MARID-type metasomes journal July 2008
Oxygen isotope constraints on the origin of high-Cr garnets from kimberlites journal December 2011
Carbonates from the lower part of transition zone or even the lower mantle journal August 2007
Zircons from kimberlite: New insights from oxygen isotopes, trace elements, and Ti in zircon thermometry journal August 2007
QSA influences on isotopic ratio measurements journal June 2004
Iron Carbide Inclusions in Lower-Mantle Diamond from Juina, Brazil journal April 2011
Mixed fluid sources involved in diamond growth constrained by Sr–Nd–Pb–C–N isotopes and trace elements journal January 2010
A global overview of isotopic heterogeneities in the oceanic mantle journal September 2012
Mineralogy of primary carbonate-bearing hypabyssal kimberlite, Lac de Gras, Slave Province, Northwest Territories, Canada journal September 2004
Carbon and oxygen isotope variations in diamond and graphite eclogites from Orapa, Botswana, and the nitrogen content of their diamonds journal February 1991
Determination of SIMS matrix effects on oxygen isotopic compositions in carbonates journal January 2011
Diamond from recycled crustal carbon documented by coupled δ18O–δ13C measurements of diamonds and theirinclusions journal February 2013
Stable Isotopes and the Origin of Diamond journal March 2005
Terrestrial Oxygen Isotope Variations and Their Implications for Planetary Lithospheres journal January 2008
High-pressure transitions of diopside and wollastonite: phase equilibria and thermochemistry of CaMgSi2O6, CaSiO3 and CaSi2O5–CaTiSiO5 system journal June 2004
Contrasting Group I and Group II Eclogite Xenolith Petrogenesis: Petrological, Trace Element and Isotopic Evidence from Eclogite, Garnet-Websterite and Alkremite Xenoliths in the Kaalvallei Kimberlite, South Africa journal May 2005
Diamondiferous eclogites from Siberia: Remnants of Archean oceanic crust journal December 1994
Oxygen isotope composition of syngenetic inclusions in diamond from the Finsch Mine, RSA journal June 1999
Anticorrelation between low δ13C of eclogitic diamonds and high δ18O of their coesite and garnet inclusions requires a subduction origin journal April 2013
Stable isotope composition of magmatic and deuteric carbonate phases in hypabyssal kimberlite, Lac de Gras field, Northwest Territories, Canada journal August 2007

Cited By (5)

New High‐Pressure Phase of CaCO 3 at the Topmost Lower Mantle: Implication for the Deep‐Mantle Carbon Transportation journal February 2018
Temperature-induced amorphization in CaCO3 at high pressure and implications for recycled CaCO3 in subduction zones journal April 2019
Polymerized 4-Fold Coordinated Carbonate Melts in the Deep Mantle text January 2019
High-Pressure Phase Diagrams of Na2CO3 and K2CO3 journal September 2019
Polymerized 4-Fold Coordinated Carbonate Melts in the Deep Mantle journal April 2019

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