Mantle refertilization by melts of crustal-derived garnet pyroxenite: Evidence from the Ronda peridotite massif, southern Spain

Marchesi, Claudio; Garrido, Carlos J.; Bosch, Delphine; Bodinier, Jean-Louis; Gervilla, Fernando; Hidas, Károly

doi:10.1016/j.epsl.2012.11.047

Cited by 46 publications

(23 citation statements)

References 90 publications

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“…10) in the K-rich melts and associated secondary clinopyroxene (Cpx2-B) are commonly interpreted as the geochemical fingerprint of plagioclase (Pl). The 'ghost Pl' signature suggests refertilization by a melt that preserved the signature of an original Pl-rich source, perhaps recycled crust (Bonadiman et al, 2008;Marchesi et al, 2013;Sobolev et al, 2000). Thus, we consider that the K 2 O-rich melts could be derived b a from the partial melting of pre-existing enriched lithospheric mantle (metasomatized by subduction-related fluids/melts), due to the rising geotherm as the asthenosphere ascends (Huang and Xu, 2010).…”

Section: Infiltration Of K-meltsmentioning

confidence: 97%

Microscale effects of melt infiltration into the lithospheric mantle: Peridotite xenoliths from Xilong, South China

Zheng

Griffin

et al. 2015

Lithos

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Section: Infiltration Of K-meltsmentioning

confidence: 97%

Microscale effects of melt infiltration into the lithospheric mantle: Peridotite xenoliths from Xilong, South China

Zheng

Griffin

et al. 2015

Lithos

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“…Garrido and Bodinier 1999;Bodinier et al 2008;Gysi et al 2012;Marchesi et al 2013;Borghini et al 2013Borghini et al , 2016Montanini and Tribuzio 2015). Specifically, pyroxenite layers in External Liguride (EL) mantle sequences (Northern Apennines, Italy) have been recently interpreted as the product of the reaction between deep infiltrated melts, likely derived from a hybrid eclogite-peridotite source, and the host peridotite (Borghini et al 2016).…”

Section: U N C O R R E C T E D P R O O F Introductionmentioning

confidence: 99%

Partial melting of secondary pyroxenite at 1 and 1.5 GPa, and its role in upwelling heterogeneous mantle

Borghini

Fumagalli

Rampone

2017

Contrib Mineral Petrol

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“…Studies based on bulk rock geochemistry (e.g., Maier et al, 2012) may be prone to significant nugget effects because of the heterogeneous distribution of PGE-bearing microphases (Lorand et al, 2013), and thus detailed investigations that combine base metal sulphide petrography, mineral trace element compositions and isotopic systematics (particularly for the Re-Os system) are vital to assess the true complexity of the upper mantle sulphur and chalcophile element reservoir (e.g., Alard et al, 2000Alard et al, , 2005Aulbach et al, 2009;Griffin et al, 2002Griffin et al, , 2004Harvey et al, 2010;Lorand et al, 1990Lorand et al, , 2008Lorand et al, , 2010Luguet et al, 2003Luguet et al, , 2004Marchesi et al, 2013;Szabo et al, 1995;Wainwright et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Paradoxical co-existing base metal sulphides in the mantle: The multi-event record preserved in Loch Roag peridotite xenoliths, North Atlantic Craton

Hughes

McDonald

Loocke

et al. 2017

Lithos

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT AbstractThe role of the subcontinental lithospheric mantle as a source of precious metals for mafic magmas is contentious and, given the chalcophile (and siderophile) character of metals such as the platinumgroup elements (PGE), Se, Te, Re, Cu and Au, the mobility of these metals is intimately linked with that of sulphur. Hence the nature of the host phase(s), and their age and stability in the subcontinental lithospheric mantle may be of critical importance. We investigate the sulphide mineralogy and sulphide in situ trace element compositions in base metal sulphides (BMS) in a suite of spinel lherzolite mantle xenoliths from northwest Scotland (Loch Roag, Isle of Lewis). This area is situated on the margin of the North Atlantic Craton which has been overprinted by a Palaeoproterozoic orogenic belt, and occurs in a region which has undergone magmatic events from the Palaeoproterozoic to the Eocene.We identify two populations of co-existing BMS within a single spinel lherzolite xenolith (LR80) and which can also be recognised in the peridotite xenolith suite as a whole. Both populations consist of a mixture of Fe-Ni-Cu sulphide minerals, and we distinguished between these according to BMS texture, petrographic setting (i.e., location within the xenolith in terms of 'interstitial' or within feldspar-spinel symplectites, as demonstrated by X-ray Computed Microtomography) and in situ trace element composition. Group A BMS are coarse, metasomatic, have low concentrations of total PGE (< 40 ppm) and high (Re/Os) N (ranging 1 to 400). Group B BMS strictly occur within symplectites of spinel and feldspar, are finer-grained rounded droplets, with micron-scale PtS (cooperite), high overall total PGE concentrations (15-800 ppm) and low (Re/Os) N ranging 0.04 to 2. Group B BMS sometimes coexist with apatite, and both the Group B BMS and apatite can preserve rounded micron-scale Ca-carbonate inclusions indicative of sulphide-carbonate-phosphate immiscibility. This carbonate-phosphate metasomatic association appears to be important in forming PGE-rich sulphide liquids, although the precise mechanism for this remains obscure. As a consequence of their position within the symplectites, Group B BMS are particularly vulnerable to being incorporated in ascending A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPTmantle-derived magmas (either by melting or physical entrainment). Based on the cross-cutting relationships of the symplectites, it is possible to in...

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Mantle refertilization by melts of crustal-derived garnet pyroxenite: Evidence from the Ronda peridotite massif, southern Spain

Cited by 46 publications

References 90 publications

Microscale effects of melt infiltration into the lithospheric mantle: Peridotite xenoliths from Xilong, South China

Microscale effects of melt infiltration into the lithospheric mantle: Peridotite xenoliths from Xilong, South China

Partial melting of secondary pyroxenite at 1 and 1.5 GPa, and its role in upwelling heterogeneous mantle

Paradoxical co-existing base metal sulphides in the mantle: The multi-event record preserved in Loch Roag peridotite xenoliths, North Atlantic Craton

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