Abstract:Based on the mineral inclusion content, diamonds from the Argyle mine, Western Australia, derive primarily (~90%) from eclogitic sources with a minor peridotitic contribution from both harzburgitic and lherzolitic lithologies. The eclogitic inclusions cover a large compositional range and, in part, show unusually high concentrations of mantle-incompatible elements (P, Ti, Na, and K). Coherent trends in major elements (e.g., of Ti or Na versus Mg-number) suggest that the eclogitic diamond source was created by … Show more
“…In the absence of inclusions suitable for geothermobarometric estimates, the exact depth of origin of the heamanite-(Ce)bearing diamond cannot be constrained but it is assumed to have originated within The presence of rutile and calcite as part of the inclusion assemblage suggests a likely eclogitic origin for the heamanite-(Ce)-bearing diamond. Rutile has previously been described in a number of diamonds in association with eclogitic garnet and omphacitic clinopyroxene (e.g., Deines and Harris 2004;Stachel et al 2018) and calcite was observed by Sobolev et al (2009) together with phlogopite and sulphide inclusions in presumed-eclogitic diamonds from Yakutia.…”
This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.
“…In the absence of inclusions suitable for geothermobarometric estimates, the exact depth of origin of the heamanite-(Ce)bearing diamond cannot be constrained but it is assumed to have originated within The presence of rutile and calcite as part of the inclusion assemblage suggests a likely eclogitic origin for the heamanite-(Ce)-bearing diamond. Rutile has previously been described in a number of diamonds in association with eclogitic garnet and omphacitic clinopyroxene (e.g., Deines and Harris 2004;Stachel et al 2018) and calcite was observed by Sobolev et al (2009) together with phlogopite and sulphide inclusions in presumed-eclogitic diamonds from Yakutia.…”
This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.
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