Extreme serpentinization and desulfurization in an early Earth setting
نویسندگان
چکیده
Abstract The ca. 3.5 Ga Bon Accord Ni deposit was located in the Barberton Greenstone Belt of Kaapvaal Craton, South Africa, and contained a unique assemblage Ni-rich minerals including trevorite (NiFe2O4). It initially interpreted as metamorphosed extraterrestrial body, recently ruled out by Cr isotope data, subsequently fragment Archean Earth’s core. More recent suggestions have highlighted similarities between magmatic sulfide mineralization. We present geochemical (rare earth element [REE], halogen, highly siderophile [HSE] abundance) isotopic (noble gases, Zn, Cr, Re-Os) study to elucidate origin this enigmatic body. is enriched REE relative primitive mantle (PM), with pattern resembling that Aldepleted komatiites. bulk material has >10 × PM Os Ir, >100 Ru, Pt, Pd, Re, radiogenic 187Os/188Os. Trevorite, silicates, two bulk-rock samples are consistent chondritic sub-chondritic initial 187Os/188Os at time formation. new data implicate komatiite precursor formation Accord, HSE bear striking those Ni-enriched deposits. Enrichment heavier Zn isotopes supports desulfurization (isotopically light) during serpentinization produce trevorite-dominated conservatively estimate process could mobilized much ~9.2 104 tonnes H2S, offering an intriguing possibility for sourcing sulfur fixes historically important gold mineralization Belt.
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ژورنال
عنوان ژورنال: Geology
سال: 2023
ISSN: ['0091-7613', '1943-2682']
DOI: https://doi.org/10.1130/g51030.1