<p>A fundamental goal of mineralogy and petrology is the deep understanding of mineral phase relation-ships and the consequent spatial and temporal patterns of mineral coexistence in rocks, ore bodies, sediments, meteorites, and other natural polycrystalline ...

<p>This paper presents geochemical behaviour of trace elements of the felsic alkaline rocks of the state of Rio de Janeiro, Brazil, with special attention of fractional crystallization and continental crust assimilation.</p>

<p>Calcite-forming by bacteria has been reported in various geological environments including limestone caves, and soil. There are four natural processes by which calcite is formed: carbonic anhydrase (CA), sulphate reduction, nitrate reduction, and urea hydrolysis. ...

<p>Serpentinites are metamorphic rocks that are produced by low grade metamorphism or hydrothermal alteration of ultramafic igneous rocks. They have been used for many centuries in the construction of major cultural and religious symbols. The serpentinization ...

This study identifies a range of feldspar textures in target rocks from the Tenoumer impact crater that suggest feldspars exhibit a range of impact-related features which span a range below the 8 GPa limit of quartz deformation.

During the past decades comprehensive investigations have been made on bentonite clays in order to find optimal components of the multi-barrier system of repositories for radioactive waste. The present study gives a mineralogical characterisation of some selected ...

Retrograde eclogites (ranging from unaltered eclogite to retrograde blueschist and greenschist mantling the eclogite boulders) from Ring Mountain on the Tiburon Peninsula, near San Francisco, California, were examined for whole-rock major and trace ...

This paper is about augen gneisses that are a peculiar lithological type of the Polika Unit (PU).

Petrographic and geochemical studies of the serpentinites from the Tehuitzingo body, the main ophiolitic outcrop of the Paleozoic Acatlan Complex of southern Mexico, provide new petrogenetic evidence and preliminary data on the nature of the fluids that interacted ...

<p>The timescale for the generation of granitic magmas and their subsequent intrusion, crystallization, and cooling as plutons is no longer incompatible with the biblical time frames of the global, year-long Flood cataclysm and of 6,000-7,000 years for earth ...