نتایج جستجو برای: decarbonation
تعداد نتایج: 111 فیلتر نتایج به سال:
The heat capacity of a natural monticellite (Ca,.,Mg.,,Fe.~Mn.o,Sio.9903.99) measured between 9.6 and 343 K using intermittent-heating, adiabatic calorimetry yields C$298) and S&s of 123.64 f 0.18 and 109.44 +0.16 J mol-’ K-’ respectively. Extrapolation ofthis entropy value to end-member monticellite results in an S$, = 108.1 + 0.2 J. mol-’ K-‘. High-temperature heat-capacity data were measured...
The study of the O and C isotope composition calcite from nepheline syenites, ijolites carbonatites Chik intrusion intrusions Erzin–Tarbagatay group Sangilen (Eastern Siberia, Russia) showed derivation alkaline melts enriched with a carbonate component host marbleized sedimentary rocks. calculations that about 40% initial mass carbonates involved in interaction silicate have remained after deca...
We report evidences of active seabed doming and gas discharge few kilometers offshore from the Naples harbor (Italy). Pockmarks, mounds, and craters characterize the seabed. These morphologies represent the top of shallow crustal structures including pagodas, faults and folds affecting the present-day seabed. They record upraise, pressurization, and release of He and CO2 from mantle melts and d...
The composition of a planet’s atmosphere can be buffered by chemical reactions with minerals at its surface [1-5]. The compositions of ‘hot’ thick exoplanet atmospheres can therefore act as probes of their planets’ surface mineralogies and compositions. In the context of a planetary atmosphere, however, many potential buffering reactions are not stable and would lead to catastrophic greenhouse ...
The physical processes which occur during an earthquake exhibit several coupled phenomena as large variations of stress, pore pressure and temperature take place in the slip zone. Thermo-poro-mechanical couplings due to shear heating can be associated to phase transition such as vaporization of the pore fluid, melting of fault gouge and to chemical effects such as dehydration of minerals or dec...
Abstract The genesis of the Bayan Obo giant rare earth element (REE) deposit has been debated for several decades. Here, we report isotopic effects dynamic recrystallization in H8 carbonatite, which is principal ore carrier deposit. We studied fresh drill core to a depth 1.78 km and documented elemental C-O-Sr isotope evolution rock-forming dolomite during its deformation reaction with fluids. ...
Single crystals for two polymorphs of the ammonium carbamate self-derivative salt of prolinamide have been successfully obtained and characterized. Decarbonation of the carbamate salts was monitored by calorimetry, confirming stabilization of the reactive carbonated adducts in the solid state. Sublimation of the salts afforded crystals of prolinamide, leading to the first crystal structure of t...
The presence of carbonates in inclusions in diamonds coming from depths exceeding 670 km are obvious evidence that carbonates exist in the Earth's lower mantle. However, their range of stability, crystal structures and the thermodynamic conditions of the decarbonation processes remain poorly constrained. Here we investigate the behaviour of pure iron carbonate at pressures over 100 GPa and temp...
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