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Silicate minerals
About: Silicate minerals is a research topic. Over the lifetime, 1794 publications have been published within this topic receiving 67064 citations.
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TL;DR: In this paper, phase diagrams that explicitly include ZrO2 in the bulk composition predict the growth and dissolution of zircon at sub-and supra-solidus conditions, which occurs within the context of the evolution of major metamorphic minerals and mineral assemblages in a pressure-temperature composition space for a metapelitic rock composition.
Abstract: Activity-composition (a–x) models have been generated for zirconium-bearing haplogranitic silicate melt and garnet from experimental data on zircon dissolution and natural rock data, respectively. Additionally including the recently proposed a–x model for Zr-bearing rutile [Tomkins et al., Journal of Metamorphic Geology25 (2007) 401], calculated phase diagrams that explicitly include ZrO2 in the bulk composition predict the growth and dissolution of zircon at sub- and supra-solidus conditions. This occurs within the context of the evolution of major metamorphic minerals and mineral assemblages in pressure-temperature-composition space for a metapelitic rock composition. The stability of zircon is a function of the bulk ZrO2 content. Garnet contains insufficient Zr to affect the stability of zircon whereas rutile does contain sufficient Zr that zircon stability can be curtailed in rocks with significant rutile. Silicate melt contains appreciable Zr and zircon abundance varies inversely with melt abundance. Thermometers based on the Zr-content of rutile (and potentially garnet) can be graphically portrayed as compositional contours in mineral assemblage fields on the phase diagrams, thereby potentially adding to the utilization of such thermometers. The ability to calculate phase diagrams explicitly including Zr is a major step towards more systematically linking zircon growth – and zircon geochronology – and accessory phase thermometry in a readily adaptable way to the metamorphic evolution of major silicate minerals in a wide range of rocks.
179 citations
TL;DR: In this article, the authors carried out a detailed study of the distribution of incompatible trace elements between the various constituents of spinel peridotites and found that fluid-derived inclusions in minerals provide minor contribution to the trace element budget of whole rocks but they strongly affect intermineral trace element partitioning.
178 citations
TL;DR: In this article, stable isotopic compositions of bulk organic carbon (δ13Corg) and lead (Pb) were measured across the silicate sediment fraction across the Bonarelli black shale (Italy), a type stratigraphic section for the end-Cenomanian OAE (OAE-2; 94.Ma).
178 citations
TL;DR: In this paper, experimental data for terrestrial olivines and pyroxenes with compositions resembling assemblages in SNC meteorites are reviewed. And the authors estimate rates of chemical weathering of minerals in Martian surface rocks.
178 citations
TL;DR: In this paper, an empirical equation for estimating sulfur content in silicate melts at anhydrite saturation based on available experimental results and an updated empirical equation was presented for estimating sulfide-liquid saturation by adding relevant experimental data.
Abstract: We present a new empirical equation for estimating sulfur content in silicate melts at anhydrite saturation based on available experimental results and an updated empirical equation for estimating sulfur content in silicate melts at sulfide-liquid saturation by adding relevant experimental data that were not previously used and excluding controversial experimental data. The fits of our empirical equations to the data used for calibration are within 10 percent error. Only total pressure, temperature, and silicate melt composition, parameters that are often known or can be reasonably assumed for natural magmatic systems, are required for utilization of the equations. The empirical equations are useful for petrologic modeling of natural magmatic systems, including magmatic hydrothermal ore deposits. Several example applications including the effect of decompression on sulfur content at sulfide-liquid saturation in komatiite and high Mg basaltic magmas and the ratio of silicate minerals to immiscible sulfide liquids during fractional crystallization of these magmas are provided.
177 citations