Tectonic implications of graphitized diamonds from the Ronda peridotite massif, southern Spain

G. R. Davies; P. H. Nixon; D. G. Pearson; M. Obata

doi:10.1130/0091-7613(1993)021<0471:TIOGDF>2.3.CO;2

Tectonic implications of graphitized diamonds from the Ronda peridotite massif, southern Spain

G. R. Davies, P. H. Nixon, D. G. Pearson, M. Obata

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Abstract

Octahedral graphite aggregates are present in garnet pyroxenites from the Ronda peridotite massif, southern Spain. In the aggregates, basal {0001} planes of graphite are parallel to {111} of the octahedra, demonstrating that the graphite is pseudomorphic after a cubic mineral. The aggregates contain clinopyroxene inclusions that have a morphology atypical of a monoclinic phase demonstrating that the precursor diamond has imposed a cubic symmetry. A tectonic model is proposed to explain how diamond-facies rocks were emplaced into the crust on both sides of an orogen. -from Authors

Original language	English
Pages (from-to)	471-474
Number of pages	4
Journal	Geology
Volume	21
Issue number	5
DOIs	https://doi.org/10.1130/0091-7613(1993)021<0471:TIOGDF>2.3.CO;2
Publication status	Published - 1 Jan 1993

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abstract = "Octahedral graphite aggregates are present in garnet pyroxenites from the Ronda peridotite massif, southern Spain. In the aggregates, basal {0001} planes of graphite are parallel to {111} of the octahedra, demonstrating that the graphite is pseudomorphic after a cubic mineral. The aggregates contain clinopyroxene inclusions that have a morphology atypical of a monoclinic phase demonstrating that the precursor diamond has imposed a cubic symmetry. A tectonic model is proposed to explain how diamond-facies rocks were emplaced into the crust on both sides of an orogen. -from Authors",

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AU - Davies, G. R.

AU - Nixon, P. H.

AU - Pearson, D. G.

AU - Obata, M.

PY - 1993/1/1

Y1 - 1993/1/1

N2 - Octahedral graphite aggregates are present in garnet pyroxenites from the Ronda peridotite massif, southern Spain. In the aggregates, basal {0001} planes of graphite are parallel to {111} of the octahedra, demonstrating that the graphite is pseudomorphic after a cubic mineral. The aggregates contain clinopyroxene inclusions that have a morphology atypical of a monoclinic phase demonstrating that the precursor diamond has imposed a cubic symmetry. A tectonic model is proposed to explain how diamond-facies rocks were emplaced into the crust on both sides of an orogen. -from Authors

AB - Octahedral graphite aggregates are present in garnet pyroxenites from the Ronda peridotite massif, southern Spain. In the aggregates, basal {0001} planes of graphite are parallel to {111} of the octahedra, demonstrating that the graphite is pseudomorphic after a cubic mineral. The aggregates contain clinopyroxene inclusions that have a morphology atypical of a monoclinic phase demonstrating that the precursor diamond has imposed a cubic symmetry. A tectonic model is proposed to explain how diamond-facies rocks were emplaced into the crust on both sides of an orogen. -from Authors

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Tectonic implications of graphitized diamonds from the Ronda peridotite massif, southern Spain

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