نتایج جستجو برای: ultramafic composition

تعداد نتایج: 260684  

Journal: :Geological Society, London, Special Publications 2021

Abstract Detrital gold fulfils the criteria of chemical inertia and physical durability required by indicator minerals but it has not found wide application in this role because may be formed different deposit types. This problem is soluble, generic compositional features hydrothermal differ according to mineralization environment. The distribution as a minor component where other commodities a...

Journal: :Chemical Geology 2021

The alkaline playas near Atlin, British Columbia, Canada are likely one of the few surface environments on Earth where contemporaneous formation hydromagnesite and magnesite occurs at temperatures that do not exceed 15 °C. This environment offers a unique opportunity to examine impact different mechanisms Mg isotope compositions Mg-carbonate minerals low temperature. In this study, we report co...

Journal: :The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists 1962

Journal: :New Zealand Journal of Geology and Geophysics 1959

Journal: :Geology 2021

Abstract Hadean zircons, from the Jack Hills (Western Australia) and other localities, are currently only window into earliest terrestrial felsic crust, formation of which remains enigmatic. Based upon new experimental results, generation such early crust has been hypothesized to involve partial melting hydrated peridotite interacting with basaltic melt at low pressure (<10 km), but it y...

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