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The Uintjiesberg kimberlite diatreme occurs within the Proterozoic Namaqua-Natal Belt, South Africa, approximately 60 km to the southwest of the Kaapvaal craton boundary. It is a group I, calcite kimberlite that has an emplacement age of ~100 Ma. Major and trace element data, in combination with petrography, are used to evaluate its petrogenesis and the nature of its source region. Macrocryst phases...
According to palinspastic reconstructions, the Neo-Tethys opening took place during the Permian between the Cimmerian fragments in the north and the Indo-Arabian margin in the south. Igneous remnants of this opening are exposed in Oman within either the Hawasina nappes or the para-autochtonous Arabian platform exposed in the Saih Hatat tectonic window. They consist predominantly of pillowed basaltic...
Magmatic differentiation processes in a cooling magma body were examined using a numerical model considering multicomponent thermodynamics and momentum, energy and species transport. The model accounts for melt transport induced by its density variation, resulting primarily from solid-liquid phase change. The equilibrium mineral assemblages, their mass fractions and their chemical compositions are...
A porphyry-type Cu (Mo, Au) polymetallic ore belt extends in an E-W direction for >400 km along the Gangdese magma arc in the southern Tibetan plateau. Extensive field investigations and systematic geochemical study, combined with S and Pb isotopic tracing, indicate that Cu polymetallic mineralization of the copper belt is genetically related to late orogenic granitic porphyries formed in a late...
The mid-Proterozoic Isortoq dike swarm in the Gardar Province, South Greenland, comprises a variety of alkaline rocks ranging from gabbroic to syenitic in composition. Major magmatic mineral phases are olivine, clinopyroxene, Fe-Ti oxides, amphibole, plagioclase and alkali feldspar. Quartz occurs in some samples as a late magmatic phase. Liquidus temperatures of olivine-bearing samples range between...
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