Incompatible trace element partitioning and residence in anhydrous spinel peridotites and websterites from the Ronda orogenic peridotite

Garrido, Carlos J.; Bodinier, Jean-Louis; Alard, Olivier

doi:10.1016/s0012-821x(00)00201-6

Cited by 91 publications

(42 citation statements)

References 44 publications

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“…Consequently, and in agreement with the results of Garrido et al (2000), the negligible amount of clinopyroxene would have negligible effects on the REE budget of the Maures samples. Both mantle (C9) and cumulate (Z13) dunites have Ushaped REE patterns, extremely low trace element contents (0.001 \ REE N \ 0.1), HIE enrichment relative to REE and a steep increase from Ce to U, typical of olivine REE patterns (Garrido et al 2000) (Fig. 9).…”

Section: Rare Earth Element Compositionsupporting

confidence: 89%

“…The mantle harzburgite (M1) is olivine-rich (80%) and has a U-shaped REE pattern, low trace element contents (0.001 \ REE N \ 0.1), very close to olivine REE patterns. In such rocks, Garrido et al (2000) suggest that olivine mostly controls the content of HREE, whereas plagioclase and clinopyroxene mostly control LREE and MREE. This rock also has Zr and Hf depletion relative to HREE, a positive Eu spike, and a small negative Sr anomaly, in addition to Cs and U enrichment.…”

Section: Rare Earth Element Compositionmentioning

confidence: 99%

“…Hermann et al 2001;Meurer and Claeson 2002). HREE enrichment relative to MREE indicates the presence (Garrido et al 2000). Negative Zr, Hf and Nb, Ta anomalies relative to HREE, in addition to strong positive Cs, Ba, U, and Pb (Pb is not represented in Fig.…”

Section: Rare Earth Element Compositionmentioning

confidence: 99%

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An early Palaeozoic supra-subduction lithosphere in the Variscides: new evidence from the Maures massif

Bellot¹,

Laverne

Bronner

2009

Int J Earth Sci (Geol Rundsch)

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Petrographic and geochemical studies of peridotites and melagabbros from the Maures massif (SE France) provide new constraints on the Early Palaeozoic evolution of the continental lithosphere in Western Europe. Peridotites occur as lenses along a unit rooted in the main Variscan suture zone. They are dominantly spinel peridotites and minor garnet-spinel peridotites. Spinel peridotites represent both residual mantle and ultramafic cumulates. Mantle-related dunites and harzburgites display high temperature textures, with olivine (Mg# 0.90 ), orthopyroxene (Mg# 0.90 ) and spinel (TiO 2 \ 0.2%; Cr# 0.64-0.83 ) compositions typical of fore-arc upper mantle. Ultramafic cumulates are dunite adcumulates, harzburgite heteradcumulates and mesocumulates, melagabbro heteradcumulates and amphibole peridotites, with olivine (Mg# 0.85-0.89 ), orthopyroxene (Mg# 0.86-0.89 ) and Cr-spinel (TiO 2 = 0.5-3.3%; Cr# 0.7-0.98 ) compositions typical of ultramafic cumulates. Cr-spinel compositions of both spinel peridotite types suggest their genesis in a supra-subduction zone lithosphere. Core to rim zoning in spinel is related to the incomplete influence of regional metamorphism and serpentinisation. The covariation of major and minor elements with Al 2 O 3 for cumulates is consistent with igneous processes involving crystal accumulation. Both mantle and cumulate dunites and harzburgites have U-shaped REE patterns and extremely low trace element contents, similar to peridotites from modern fore-arc peridotites (South Atlantic) and from ophiolites related to supra-subduction zones (Semail, Cyclops, Pindos, Troodos). Melagabbros also have U-shaped REE patterns similar to xenoliths from the Philippine island arc, but also similar to intrusive ultramafic cumulates from the Semail nappe of Oman related to a proto-subduction setting. A wehrlite has a REE pattern similar to that of amphibole peridotites reflecting metasomatism of clinopyroxene-bearing peridotites due to subduction-related fluids. The Maures spinel peridotites and melagabbros are therefore interpreted as the lowermost parts of a crustal sequence and minor residual mantle of lithosphere generated in a supra-subduction zone during Early Palaeozoic time. Garnet-spinel peridotites are chemically close to melagabbros, but have recorded high pressure metamorphism before their retrogression similar to spinel peridotites into amphibolites to greenschists facies metamorphism. They indicate burial to mantle depths of the margin of the supra-subduction lithosphere during the Early Palaeozoic continental subduction. Both peridotite types were exhumed during the Upper Palaeozoic continental collision. Comparable observations from other Variscanrelated peridotites, in particular of the Speik complex of the Autroalpine basement, and a common age for the subduction stage allow extension of these regional conclusions to a broad area sharing the Cambrian suture zone, extending from the Ossa-Morena to the Bohemian massif.

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Section: Rare Earth Element Compositionsupporting

confidence: 89%

Section: Rare Earth Element Compositionmentioning

confidence: 99%

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An early Palaeozoic supra-subduction lithosphere in the Variscides: new evidence from the Maures massif

Bellot¹,

Laverne

Bronner

2009

Int J Earth Sci (Geol Rundsch)

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“…1). Such discrepancies require storage of significant amounts of incompatible elements in cryptic phases such as accessory minerals, glass, fluid inclusions, or interfaces (e.g., Menzies and Murthy, 1978;Ottonello, 1980;Stosch et al, 1986;Zindler and Jagoutz, 1988;Ionov et al, 1992;Garrido et al, 2000;Xu et al, 2003). In some cases the discrepancy between whole rock and clean rock concentrations has been shown to increase with increasing incompatibility (Zindler and Jagoutz, 1988;Xu et al, 2003), an observation consistent with storage of these elements at interfaces.…”

Section: Interface Chemical Component In Whole Rock Chemistrymentioning

confidence: 74%

“…In some cases the discrepancy between whole rock and clean rock concentrations has been shown to increase with increasing incompatibility (Zindler and Jagoutz, 1988;Xu et al, 2003), an observation consistent with storage of these elements at interfaces. Data for Rb, Ba, Th, U, La, Ce, and Sr from harzburgite (RC147) in Garrido et al (2000) for which the mineral mode is (f ol , f opx , f cpx ) = (0.72, 0.2, 0.06) are included in Fig. 3b.…”

Section: Interface Chemical Component In Whole Rock Chemistrymentioning

confidence: 99%

Equilibrium interface segregation in the diopside–forsterite system II: Applications of interface enrichment to mantle geochemistry

Hiraga

Hirschmann

Kohlstedt

2007

Geochimica et Cosmochimica Acta

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The structure and composition of olivine grain boundaries: 40 years of studies, status and current developments

Marquardt

Faul

2018

Phys Chem Minerals

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Interfaces in rocks, especially grain boundaries in olivine dominated rocks, have been subject to about 40 years of studies. The grain boundary structure to property relation is fundamental to understand the diverging properties of polycrystalline samples compared to those of single crystals. The number of direct structural observations is small, i.e. in range of 100 micrographs, and the number of measurements of properties directly linked to structural observations is even smaller. Bulk aggregate properties, such as seismic attenuation and electrical conductivity are sensitive to grain size, and seem to show influences by grain boundary character distributions. We review previous studies on grain boundary structure and composition and plausible relations to bulk properties. Experimentally determined seismic properties and rheology of olivine are sensitive to grain boundary characteristics. The grain boundary geometry is described using five independent parameters, generally their structural width is ranges between 0.4-1.2 nm and

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Incompatible trace element partitioning and residence in anhydrous spinel peridotites and websterites from the Ronda orogenic peridotite

Cited by 91 publications

References 44 publications

An early Palaeozoic supra-subduction lithosphere in the Variscides: new evidence from the Maures massif

An early Palaeozoic supra-subduction lithosphere in the Variscides: new evidence from the Maures massif

Equilibrium interface segregation in the diopside–forsterite system II: Applications of interface enrichment to mantle geochemistry

The structure and composition of olivine grain boundaries: 40 years of studies, status and current developments

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