Differential platinum group elements (PGE) re-mobilization at low fS2 in Abdasht and Soghan mafic-ultramafic complexes (Southern Iran)

Grieco, G.; Bussolesi, Micol; Eslami, Alireza; Gentile, Andrea; Cavallo, Alessandro; Lian, Dongyang; Yang, Jiayin; Farhad, Ghaseminejad

doi:10.1016/j.lithos.2020.105523

Cited by 10 publications

(5 citation statements)

References 52 publications

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“…[1] PGEs are also known to be highly durable. [2] On the other hand, bioaccumulative PGEs in food chains adversely affect the environment and human health. [1] PGE compounds, which are potent respiratory allergens, can cause many diseases such as conjunctivitis, rhinitis, asthma and urticaria.…”

Section: Introductionmentioning

confidence: 99%

“…Platinum‐group elements (PGEs) are known as less toxic compared to the other metals and they are mainly used to control exhaust emissions due to their high catalytic activities [1] . PGEs are also known to be highly durable [2] . On the other hand, bioaccumulative PGEs in food chains adversely affect the environment and human health [1] .…”

Section: Introductionmentioning

confidence: 99%

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A Simple and Effective Quantification of Water‐Soluble Rhodium in Soil Samples by Magnetic‐Colloidal‐Gel‐Assisted Dispersive Solid Phase Extraction

et al. 2023

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In this study, a simple, sensitive and environmentally friendly method was developed for the determination of water-soluble rhodium in soil samples. For this purpose, rhodium was preconcentrated/separated by a dispersive solid phase extraction method (dSPE) and determined by an atomic absorption spectrophotometer with flame atomizer, equipped with a slotted quartz tube (SQT-FAAS). In the dSPE method, a magnetic colloidal gel (magnetic nanofluid) was produced by mixing Fe 3 O 4 based magnetic nanoparticles (MNP), and deep eutectic solvent (DES) obtained from the mixture of choline chloride and phenol (1 : 3). The optimized system showed good linearity in the concentration range of 17-447 μg/kg. While recording a detection limit (LOD) of 4.26 μg/kg, an over 200fold improvement in the detection power was obtained based on the comparison of LODs of the developed method and FAAS. Applicability and accuracy of the developed method were validated by spike recovery results that fell in the range of 89-106 %, using the matrix matching method to boost quantification accuracy in the soil samples.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Simple and Effective Quantification of Water‐Soluble Rhodium in Soil Samples by Magnetic‐Colloidal‐Gel‐Assisted Dispersive Solid Phase Extraction

et al. 2023

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“…The PGM enclosed in fresh chromite are generally preserved by alteration and are referred to as primary PGM, having crystallized at high T during the magmatic stage [6][7][8][9][10]. On the contrary, the PGM not included in chromite are exposed to alteration and, in some cases, can be altered and reworked at a small scale by the action of low T fluids forming the so-called secondary PGM [5,[8][9][10][11][12][13][14][15]. Two different types of chromitite have been described within the ophiolite complexes: (1) podiform chromitite that is typically hosted in the mantle tectonite and (2) stratiform chromitite occurring concordantly with the layered ultramafic rocks at the base of supra-Moho cumulates, above the crustal sequence [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…Selected exceptions include chromitites from Canada [10,16,17], from the Caribbean area [18][19][20], from north and central Europe [21][22][23], from the Balkan Peninsula [24][25][26], from Turkey and Saudi Arabia [8,9], from Eastern Sayan in Russia [14,27,28] and from the Philippines and New Caledonia [11,12,29]. The PPGE rich chromitites occur in the mantle and in the crustal sequence of the host ophiolite, regardless of the composition of the host chromite [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Origin of Podiform Chromitites in the Sebuku Island Ophiolite (South Kalimantan, Indonesia): Constraints from Chromite Composition and PGE Mineralogy

et al. 2022

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The presence of PGM associated with the podiform chromitites in the Jurassic–Cretaceous ophiolite of Sebuku Island (South Kalimantan, Indonesia) is reported for the first time. Two types of chromitite have been recognized; one with high-Cr composition (Cr/(Cr + Al) > 0.7) occurs in the deep mantle, the other, high-Al (Cr/(Cr + Al) < 0.6), is located close to the Moho transition zone. The TiO2-Al2O3 relations indicate affinity to IAT and MORB, for the high-Cr and high-Al chromitites, respectively. However, both are believed to have formed by mantle/melt reaction and differentiation of a magma characterized by an initial IAT composition related to an SSZ. Primary magmatic inclusions (<10 μm) of laurite characterized by Ru/Os chondritic ratio are the only PGM found in the high-Cr chromitites, indicating crystallization from undifferentiated magma, at low fS2 in the mantle. In contrast, the high-Al to chondrite, suggesting the increase of fS2 in the evolved melt. Besides laurite, the high-Al chromitite contains a complex assemblage of secondary PGM (Pt-Fe, garutiite, iridium, ruthenium–magnetite aggregates, zaccariniite and unnamed Ru and Mn oxides). These secondary PGM have an irregular shape and occur exclusively in the chlorite matrix sometimes associated with Mn-Ni-Fe-Cr hydroxides. They are interpreted to have formed by desulfuration of primary interstitial PGM sulfides or to have precipitated from secondary fluids during low T alteration. The relative abundance of PPGE in the high-Al chromitite is interpreted as a result of PGE fractionation during differentiation of the parent melt of the chromitites.

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“…Primary silicates will transform into serpentine, talc, chlorite and to a lesser extent into secondary Cr-bearing garnet (Tsoupas and Economou-Eliopoulos, 2008;Kapsiotis et al, 2017;Farré-de-Pablo et al, 2021). Although spinel and PGM are usually less susceptible to hydrothermal and metamorphic overprints (Sideridis et al, 2022), they may produce unique textures and change their primary compositional and mineralogical assemblages (Zaccarini et al, 2005;Kapsiotis et al, 2009;Gervilla et al, 2012;de Melo Portella et al, 2016;Arai et al, 2020;Grieco et al, 2020;Farré-de-Pablo et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Post-magmatic processes recorded in bimodal chromitites of the East Chalkidiki meta-ultramafic bodies, Gomati and Nea Roda, Northern Greece

Sideridis

Tsikouras²,

Tsitsanis³

et al. 2022

Front. Earth Sci.

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The meta-ultramafic bodies of Gomati and Nea Roda are situated in the Serbomacedonian Massif. They demonstrate bimodal character in terms of chromitite chemistry with both Cr- and Al-rich chromitites outcropping in proximity, with no obvious tectonic structure intercepting those two varieties. Based on the trace element abundances in spinel grains, metamorphosis reached amphibolite facies, forming porous spinel. Chromitite-hosted chlorite and garnet chemistry correlates with greenschist facies temperatures and formation of zoned spinel grains. Despite the metamorphic overprint, some of the primary features of the chromitites have been preserved. The PGE contents demonstrate an increase in Pd/Ir ratios in some chromitites pointing to fractionation, whereas low ratios of mostly Cr-rich chromitites point to partial melting being the main mechanism that controls PGE mineralization. The normalized trace element patterns of spinel-group minerals revealed that Al-rich chromitites were generated in spreading settings in a back-arc and the Cr-rich counterparts in SSZ environment. The parental melts of Al-rich and Cr-rich chromitites demonstrate MORB and boninitic affinities, respectively. The meta-ultramafic protoliths were modified within a subduction zone, with significant input of a sedimentary source, as confirmed by the chemistry of serpentinite, diopside and Sb-mineralization. These results suggest common geotectonic processes within the Rhodope and the Serbomacedonian massif, that have affected the ultramafic bodies and chromitite occurrences.

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Differential platinum group elements (PGE) re-mobilization at low fS2 in Abdasht and Soghan mafic-ultramafic complexes (Southern Iran)

Cited by 10 publications

References 52 publications

A Simple and Effective Quantification of Water‐Soluble Rhodium in Soil Samples by Magnetic‐Colloidal‐Gel‐Assisted Dispersive Solid Phase Extraction

A Simple and Effective Quantification of Water‐Soluble Rhodium in Soil Samples by Magnetic‐Colloidal‐Gel‐Assisted Dispersive Solid Phase Extraction

Origin of Podiform Chromitites in the Sebuku Island Ophiolite (South Kalimantan, Indonesia): Constraints from Chromite Composition and PGE Mineralogy

Post-magmatic processes recorded in bimodal chromitites of the East Chalkidiki meta-ultramafic bodies, Gomati and Nea Roda, Northern Greece

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