Pore difference characteristics and adsorption/desorption experiments of primary coal with different degrees were explored to study the pore structure gas desorption. The results show that volume increases increase in degree metamorphism. In metamorphism, distribution micropores, small pores, medium-sized pores (by volume) is WY < PM CY. large visible was > According law metamorphic coals, aver...

The Lower Llandoverian metasedimentary rocks of the Prades Mountains, southwestern Catalonia, Spain, consist of interstratified anorthite-rich beds, chert beds, phosphate beds, sulfide-rich black shale (with mainly pyrrhotite and minor chalcopyrite), massive sulfide lenses and calc-silicate beds. These metasedimentary rocks are anomalously enriched in V and Cr, and have disseminated minerals of...

Marbles containing high-pressure mineral assemblage was found from the Sanandaj-Sirjan metamorphic belt in the Nahavand area in western Iran.  The high-pressure marbles occur as small bodies or lenses within pelitic schist layers and show compositional banding of carbonate- and silicate- rich bands.  Textural analysis revealed two metamorphic stages.  The early stage is testified by relicts of ...

ABSTRACT This paper presents and discusses the results of phase diagram (Perple_X) diffusion modelling (CZGM, or Compositional Zoning its Modification by diffusion) to constrain P–T path metamorphism. The approach is based on best fits between zoning profile in measured garnet that obtained intersections isopleths calculated using whole rock bulk composition. model was applied garnets natural r...

Thallium (Tl) is a highly incompatible element which can be redistributed during various igneous and hydrothermal events such as mineral dehydration low-temperature alteration. Despite the strong influence fluid-rock interactions have on Tl redistribution importance of fluids in subduction-zone volatiles cycling, geochemical behavior high-P/T metamorphism has not yet been quantified. Here we pr...