Carbon bearing aluminosilicate melt at high pressure
نویسندگان
چکیده
It is well known that volatiles such as water has significant influence on the properties of silicate melts. Carbon dioxide (CO2) also an abundant volatile in deep Earth, however effect CO2 polymerized melts, particularly transport properties, are poorly understood. This crucial for better understanding generation and migration carbon bearing magma crustal mantle settings. In this study, we explore structure aluminosilicate melt up to a pressure ~25 GPa temperature range 2500–4000 K using first principles molecular dynamics (FPMD) simulation. Our results show melts dissolves carbonate (CO32-) at lower pressures (~0–3 GPa). However, higher (>3 GPa) relevant most upper mantle, CO32- predominant species along with 4-fold coordination (CO4). Fraction increases decreasing increasing pressure. We find reference isotherm (2500 K), density reduced by addition (in wt.%) dρdXCO2 = −0.0214. Effect more pronounced dρdXH2O −0.0422. Thus, gravity-driven buoyancy rich will be greater than without components. The compressibility affected volatiles. For instance, both bulk modulus (KT0) its derivative (KT0') respectively dry melt. Aluminosilicate highly anomalous dependence viscosity. Pressure viscosity low regime (P < 5 dlog(η)dP=-2.06. Melt further it minimizes where exhibits minima. Due larger H2O depths, mobility (Δρη) residence time expected shorter free those Like mobility, electrical conductivity when present <1 vol.% mixed matrix could sufficient explain observed anomalies mantle.
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ژورنال
عنوان ژورنال: Geochimica et Cosmochimica Acta
سال: 2021
ISSN: ['1872-9533', '0016-7037']
DOI: https://doi.org/10.1016/j.gca.2021.07.039