کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5787368 | 1641475 | 2017 | 36 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
P-V-T equation of state of CaCO3 aragonite to 29Â GPa and 1673Â K: In situ X-ray diffraction study
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فیزیک زمین (ژئو فیزیک)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: P-V-T equation of state of CaCO3 aragonite to 29Â GPa and 1673Â K: In situ X-ray diffraction study P-V-T equation of state of CaCO3 aragonite to 29Â GPa and 1673Â K: In situ X-ray diffraction study](/preview/png/5787368.png)
چکیده انگلیسی
Pressure-volume-temperature relations have been measured to 29 GPa and 1673 K for CaCO3 aragonite using synchrotron X-ray diffraction with a multianvil apparatus at the 'SPring-8' facility. A least-squares fit of the room-temperature compression data to the Vinet-Rydberg equation of state (EOS) yielded KT0 = 65.7 ± 0.8 GPa and KT' = 5.1 ± 0.1, with fixed V0 = 227.11 Ã
3. Further analysis of the high-temperature compression data led to the temperature derivative of the bulk modulus (âKT/âT)P = â0.016 ± 0.001 GPa/K and zero-pressure thermal expansion α = a0 + a1T with a0 = 4.98 (22) Ã 10â5 Kâ1 and a1 = 2.81(38) Ã 10â8 Kâ2. The Mie-Gruneisen-Debye approach revealed the Gruneisen parameter γ0 = 1.39 at a fixed Debye temperature θ0 = 516 K and the parameter q = 1. Analysis of axial compressibility and thermal expansion indicates that the c-axis is two times more compressible than the b-axis and four times more compressible than the a-axis, whereas zero-pressure thermal expansion of the a-axis (a0a = 2.6 Ã 10â5 Kâ1 and a1a = 2.3 Ã 10â8 Kâ2) is weaker than that of the b-axis axis (a0b = 6.3 Ã 10â5 Kâ1 and a1b = 0.1 Ã 10â8 Kâ2) and c-axis axis (a0c = 5.2 Ã 10â5 Kâ1 and a1c = 9.5 Ã 10â8 Kâ2). A full set of thermodynamic parameters (including heat capacity, enthalpy and free energy) for aragonite and updated equations of state for magnesite and siderite was obtained using the Kunc-Einstein approach. The new EOS parameters were used for thermodynamic calculations for aragonite decarbonation reactions. The present thermal EOS provides accurate calculations of aragonite density to deep mantle. Decarbonation of subducting oceanic crust containing 2 wt% aragonite would result in a 0.5% density reduction at 30 GPa and 1273 K. Aragonite becomes denser than magnesite at pressures about 16 GPa along the 1500 K isotherm and at 9 GPa along the 298 K isotherm.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics of the Earth and Planetary Interiors - Volume 265, April 2017, Pages 82-91
Journal: Physics of the Earth and Planetary Interiors - Volume 265, April 2017, Pages 82-91
نویسندگان
Konstantin D. Litasov, Anton Shatskiy, Pavel N. Gavryushkin, Altyna E. Bekhtenova, Peter I. Dorogokupets, Boris S. Danilov, Yuji Higo, Abdirash T. Akilbekov, Talgat M. Inerbaev,