A secondary precious and base metal mineralization in chromitites linked to the development of a Paleozoic accretionary complex in Central Chile

Gonzáléz-Jiménez, José María; Barra, Fernando; Garrido, Leonardo N.F.; Reich, Martín; Satsukawa, Takako; Romero, Rurik; Salazar, Eduardo; Colás, Vanessa; Orellana, F.; Rabbia, Osvaldo; Plissart, Gaëlle; Morata, Diego

doi:10.1016/j.oregeorev.2016.02.017

Cited by 25 publications

(9 citation statements)

References 104 publications

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“…However, the Manipur chromitites were most likely formed in a dynamic magmatic regime characterized by sudden changes in fS 2 . We suggest that localized and momentary increases of fS 2 caused the segregation of tiny immiscible BMS droplets from the parental melts of chromite (González-Jiménez et al, 2009). This model can sufficiently explain the occurrence of composite grains made up of PGM and millerite in the investigated chromitite samples.…”

Section: Hints On the Physicochemical Conditions Of Pgm Formationmentioning

confidence: 52%

“…that PGM crystallization happens in mafic/ultramafic orthomagmatic systems characterized by sudden fluctuations in the T, fO 2 , and fS 2 conditions (González-Jiménez et al, 2009;Kapsiotis et al, 2009).…”

Section: Hints On the Physicochemical Conditions Of Pgm Formationmentioning

confidence: 98%

“…When we combine our data with Zaccarini et al (2016), we get that individual chromitite bodies in Manipur host different PGM assemblages. This mineralogical heterogeneity requires a mechanism capable of creating different fS 2 gradients in space with or without significant changes in T over relatively short periods (González-Jiménez et al, 2009). It has been suggested…”

Section: Hints On the Physicochemical Conditions Of Pgm Formationmentioning

confidence: 99%

“…Composition of the chlorite inclusion in chromite of Manipur ophiolite chromitites, (a) SiO 2 –FeO–MgO–Al 2 O 3 with reference to type I and type II chlorites (González‐Jiménez et al, 2016) and (b) Si versus Fe total in the plot proposed by Hey (1954)…”

Section: Mineral Inclusions In Chromitementioning

confidence: 99%

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Platinum‐group mineral and silicate inclusions in the low‐Al chromitites of the Manipur ophiolite, northeast India: Implications on Cr‐PGE mineralization in nascent subduction zone settings

Singh

Bidyananda

Kapsiotis³

2022

Geological Journal

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Low‐Al chromitites from the Manipur ophiolite contain a wide range of mineral inclusions, including hydrous and anhydrous silicates, sulphides, and platinum group minerals (PGM). The common inclusions are primary silicates, such as clinopyroxene, orthopyroxene and secondary silicate inclusions, such as chlorite, serpentine, and garnet. These inclusions are small (<30 μm in PGM, <100 μm in silicates) and randomly distributed throughout their host chromite grains. The shape and texture indicate some inclusions (clinopyroxene, orthopyroxene, PGMs) trapped during the magmatic stage and most inclusions (chlorite, serpentine, and uvarovite) trapped during recrystallization of chromite. Clinopyroxene was discrete inside the chromite, with Cr2O3 content ranging from 0.62 to 1.77 wt.%, and Al2O3 varying between 0.96 to 1.63 wt.%. Orthopyroxene is enstatite (En93Wo2Fs4), Cr2O3 varies from 0.58 to 1.8 wt.% and the minor amount of CaO (0.41–0.81 wt.%), and Al2O3 (0.58–0.83 wt.%). Uvarovite is present in two forms: discrete crystal inclusions (anhydrous) in chromites and fractures (hydrous) as fillings. The chlorite occurs as lath shaped, and patchy phase is Cr‐rich variety ‐ kammererite (clinochlore) and penninite with variable Cr2O3 (0.22–7.25 wt.%) and FeO (2.5–3.9 wt.%). The PGM in the studied chromite are laurite (Ru, Os, Ir)S2. The parental melts of chromitites had low TiO2 (0.16–0.48 wt.%) and Al2O3 (10.18–14.58 wt.%) contents, and primary mineral inclusions, suggesting an arc‐like geochemical affinity, and the estimated melt composition is comparable with that of boninitic magma.

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Section: Hints On the Physicochemical Conditions Of Pgm Formationmentioning

confidence: 52%

Section: Hints On the Physicochemical Conditions Of Pgm Formationmentioning

confidence: 98%

Section: Hints On the Physicochemical Conditions Of Pgm Formationmentioning

confidence: 99%

Section: Mineral Inclusions In Chromitementioning

confidence: 99%

See 2 more Smart Citations

Platinum‐group mineral and silicate inclusions in the low‐Al chromitites of the Manipur ophiolite, northeast India: Implications on Cr‐PGE mineralization in nascent subduction zone settings

Singh

Bidyananda

Kapsiotis³

2022

Geological Journal

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“…Liu et al (2021) recently conducted a major element study of chromites to investigate the genesis and tectonic setting of the Fuchuan chromitites (FC) and FO, while there is slightly constricted to discriminate tectonic settings caused by the overlap area of mid-ocean ridge basalt (MORB) and suprasubduction zone (SSZ). Compared to major elements, in situ trace element analysis can investigate the minerals of interest without interference from the surrounding phases (Dare et al, 2009;Pagé and Barnes, 2009;Gonzá lez-Jimé nez et al, 2014;Mukherjee et al, 2015). Dare et al (2009) developed a Ti/Fe 3+# -Ga/Fe 3+# diagram of spinels to discriminate MOR setting from SSZ setting and tested this method in mantle peridotites from the northern Oman ophiolite.…”

Section: Introductionmentioning

confidence: 99%

Genesis and Geodynamic Significance of Chromitites from the Fuchuan Ophiolite, Southern China, as Evidenced by Trace Element Fingerprints of Chromite, Olivine and Pyroxene

Liu

WANG

2023

Acta Geologica Sinica (Eng)

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The Fuchuan ophiolite is located in the northeasternmost segment of the Neoproterozoic Jiangnan orogen and consists mainly of harzburgites, with minor dunites, pyroxenite and gabbro veins and dykes. In order to investigate the genesis and tectonic setting of the Fuchuan ophiolite and chromitites, in situ analyses of unaltered chromites and silicates were carried out. Trace element analyses of unaltered chromites from the Fuchuan chromitites indicate the parental magma is of mid‐ocean ridge basalt (MORB)‐like origin, with the Ti/Fe3+#–Ga/Fe3+# diagram of chromites showing that the chromitites are a result of melt/rock interaction of MORB melts with mantle peridotites, and that the Fuchuan harzburgites present the dual features of MORB and supra‐subduction zone peridotites (SSZP). Trace and rare earth element (REE) analyses of olivines and orthopyroxenes from the Fuchuan harzburgites hint at the possibility of mantle metasomatism influenced by SSZ‐subducted fluids. Finally, integrating with previous study, the Fuchuan ophiolite and chromitites might have been formed in a back‐arc spreading ridge between the Yangtze and Cathaysia blocks during the Neoproterozoic.

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Low-temperature hydrothermal Pt mineralization in uvarovite-bearing ophiolitic chromitites from the Dominican Republic

et al. 2021

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A secondary precious and base metal mineralization in chromitites linked to the development of a Paleozoic accretionary complex in Central Chile

Cited by 25 publications

References 104 publications

Platinum‐group mineral and silicate inclusions in the low‐Al chromitites of the Manipur ophiolite, northeast India: Implications on Cr‐PGE mineralization in nascent subduction zone settings

Platinum‐group mineral and silicate inclusions in the low‐Al chromitites of the Manipur ophiolite, northeast India: Implications on Cr‐PGE mineralization in nascent subduction zone settings

Genesis and Geodynamic Significance of Chromitites from the Fuchuan Ophiolite, Southern China, as Evidenced by Trace Element Fingerprints of Chromite, Olivine and Pyroxene

Low-temperature hydrothermal Pt mineralization in uvarovite-bearing ophiolitic chromitites from the Dominican Republic

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