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

Davies, Gareth R.; Nixon, P.H.; Pearson, D.G.; Obata, Masaaki

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

Cited by 138 publications

(63 citation statements)

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“…To reconcile the trace element evidence for HP fractionation in these pyroxenites and their isotopic signature indicating their derivation from hydrothermally altered crust (AEhemipelagic sediments - Pearson et al, 1991a,b), the authors have interpreted the pyroxenites as crystal segregates from partial melts derived from subducted oceanic crust. Davies et al (1993) postulated a similar origin for the HP (garnet-bearing) pyroxenites of the Ronda massif and suggested a geodynamic scenario involving the origin of the pyroxenites in a suprasubduction mantle wedge during an early evolutionary stage of the Ronda and Beni Bousera orogenic peridotites. Conversely, Garrido and Bodinier (1999) found that the majority of the LP (spinel-bearing) pyroxenites occurring in the granular and plagioclase-tectonite domains of Ronda were formed late in the history of the body by metasomatic replacement of peridotites .…”

Section: Interpretationsmentioning

confidence: 97%

Orogenic, Ophiolitic, and Abyssal Peridotites

Bodinier

Godard

2014

Treatise on Geochemistry

189

148

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Section: Interpretationsmentioning

confidence: 97%

Orogenic, Ophiolitic, and Abyssal Peridotites

Bodinier

Godard

2014

Treatise on Geochemistry

189

148

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“…The Ronda peridotite massif, the largest known surface exposure of lithospheric mantle, is a thrust sheet within the Alpujarride complex (Lundeen, 1978;Tubia and Cuevas, 1986;Davies et al, 1993).…”

Section: Sw-nementioning

confidence: 99%

Introduction

1996

Proceedings of the Ocean Drilling Program

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“…It is probable that the aluminous mafic rocks experienced higher-pressure conditions than high-pressure granulite to eclogite facies expected from petrographic characteristics because graphitized diamond-bearing garnet pyroxenites indicating ultra-high-pressure conditions were reported from both the Ronda and Beni Bousera massifs (Slodkevich, 1983;Pearson et al, 1989;Davies et al, 1993). Note that these diamond-bearing rocks have distinct mineralogical and geochemical signatures from the aluminous mafic rocks (Morishita et al, 2001).…”

Section: Sample Descriptionsmentioning

confidence: 99%

“…Graphitized-diamond-bearing garnet pyroxenites were reported from both massifs (Slodkevich, 1983;Pearson et al, 1989;Davies et al, 1993). The diamond-bearing garnet pyroxenites have distinct differences from the Type II mafic rocks, that is the aluminous mafic rocks (Morishita et al, 2001).…”

Section: Geological Backgroundmentioning

confidence: 99%

Constraints on the evolutionary history of aluminous mafic rocks in the Ronda peridotite massif (Spain) from trace-element compositions of clinopyroxene and garnet

et al. 2009

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Multiple trace-element compositions of clinopyroxene and garnet in aluminous mafic layers (±corundum and/or sapphirine) alternating with peridotites from the Ronda massif, Spain, were determined by an ArF 193 nm excimer laser system coupled with a quadrupole ICP-MS. The studied aluminous mafic rock is divided into several sublayers based on the modal mineral variations. Trace-element compositions of minerals vary between sublayers. Primitive mantle-normalized trace-element distribution patterns have more significant positive Eu anomaly for both garnet and clinopyroxene in the corundum-bearing sublayers than for those in the other sublayers whereas corundum-bearing sublayers contain more abundant secondary plagioclase than corundum-free sublayers. These geochemical signatures of the corundum-bearing sublayers intercalated with corundum-free sublayers were acquired as plagioclase-rich portions of gabbroic layered sequence originated at the lower crustal to the uppermost mantle sections rather than selective accumulation of metamorphic plagioclase due to deformation during the late stage of exhumation of the massif. Partition coefficients of trace elements between clinopyroxene and garnet show systematic variations with respect to major element composition, indicating local attainment of chemical equilibrium. The trace element compositions of clinopyroxene and garnet were equilibrated with secondary metamorphic plagioclase, i.e., at granulite-facies conditions, because plagioclase is required for the geochemical balance in Sr and Eu contents of the whole-rock trace element compositions. Positive Eu anomaly of clinopyroxene (±garnet) is also found in mantle-derived aluminous eclogitic xenoliths and eclogitic mineral inclusions in diamond captured in kimberlites, and is thus a useful indicator to explore recycled crustal components in the mantle.

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

Cited by 138 publications

References 0 publications

Orogenic, Ophiolitic, and Abyssal Peridotites

Orogenic, Ophiolitic, and Abyssal Peridotites

Introduction

Constraints on the evolutionary history of aluminous mafic rocks in the Ronda peridotite massif (Spain) from trace-element compositions of clinopyroxene and garnet

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