Shirozulite is a new Mn-dominant trioctahedral mica from the Taguchi mine, Aichi Prefecture, Japan. The mineral occurs in tephroite-rhodochrosite ores in contact with a Ba-bearing, K-feldspar vein. Shirozulite formed during regional low-P/T metamorphism and, thereafter, suffered thermal metamorphism from a local granodiorite. Grains of shirozulite are up to 0.5 mm across and have a typical mica...

Molecular structures and chemical compositions of organic matter in primitive meteorites reflect the conditions parent bodies, as well preaccretional history. During body processing, co-existing minerals could have effects on structural changes organics, addition to temperature redox state. Here, we performed heating experiments a primordial analog with without understand simulating metamorphis...

Located at the westernmost tip of Mediterranean, Gibraltar Arc is a segment Alpine belt that exhibits peridotite massifs associated with high-grade crustal metamorphic units. The timing and mechanisms exhumation these crust–mantle associations are still debated in Rif Morocco as well Betic Cordilleras Spain. A structural, petrographic, geochronological study ( 40 Ar– 39 Ar method) performed Ben...

Ancient geological materials are likely to be contaminated through geological times. Thus, establishing the syngeneity of the organic matter embedded in a mineral matrix is a crucial step in the study of very ancient rocks. This is particularly the case for Archean siliceous sedimentary rocks (cherts), which record the earliest traces of life. We used electron paramagnetic resonance (EPR) for a...

The paper touches upon the relationships between kimberlite and basalt magmatism in Nakyn field of Yakutian province. It was established, that source for melts pre-kimberlite basite ancient enriched lithosphere mantle probably with participation lower crust substance (EM II) post-kimberlite basite, i.e. depleted feasibly younger upper involved. impact melt on kimberlites Nyurba pipe proceeds as...

A novel method has been developed for compound-specific nitrogen isotope compositions with an achiral column which was previously shown to offer high precision for nitrogen isotopic analysis. We applied the method to determine the amino acid contents and stable nitrogen isotopic compositions of individual amino acids from the thermally metamorphosed (above 500 °C) Antarctic carbonaceous chondri...

Simulations and experiments have been carried out to investigate heat transfer and thermodynamic processes in coal-bearing strata in order to quantitatively understand the development of underground coal fires under the spontaneous combustion condition. With the controlled temperature and under lean oxygen conditions, the thermodynamic parameters for coal oxidation at different stages are exper...