Highlights ► Cr diffusion in hardmetals Independent from binder alloy in early sintering stages ► Nitrogen reduces solubility and diffusivity of Cr and V in hardmetals ► Diffusion in hardmetal green bodies is faster than in equilibrated hard metals ► No (W,V)C layer is observable on WC at 1050 °C ► A valuable grain size for VC and Cr 3 C 2 for hardmetal sintering was estimated
This paper presents a new interactive MATLAB-based visualization and calculation tool (TETGAR_C) for assessing the provenance of detrital garnets in a four-component (tetrahedral) plot system (almandine-pyrope-grossular-spessartine). Based on a freely-accessible database and additional electron-microprobe data, the chemistry of more than 2,600 garnet samples was evaluated and used to create various subfields in the tetrahedron that correspond to calc-silicate rocks, felsic igneous rocks (granites and pegmatites) as well as metasedimentary and metaigneous rocks of various metamorphic grades. These subfields act as reference structures facilitating assignments of garnet chemistries to source lithologies. An integrated function calculates whether a point is located in a subfield or not. Moreover, TETGAR_C determines the distance to the closest subfield's mean value. Compared with conventional ternary garnet discrimination diagrams, this provenance tool enables a more accurate assessment of potential source rocks by reducing the overlap of specific subfields and offering quantitative testing of garnet compositions. In particular, a much clearer distinction between garnets from greenschist-facies rocks, amphibolite-facies rocks, blueschist-facies rocks and felsic igneous rocks is achieved. Moreover, TETGAR_C enables a distinction between garnet grains with metaigneous and metasedimentary provenance. In general, metaigneous garnet tends to have higher grossular content than metasedimentary garnet formed under similar P-T conditions.
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