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Sep 01, 2017 The analysis of the relationship between heat production in the granitic rocks and the tectonic environment where the granitic rocks were formed shows that the age of granites is more important than the granite-type in controlling bulk rock heat production (Table 10, Fig. 10). For Phanerozoic granites, we do not find any correlation between the Granite is a common and widely occurring type of intrusive, felsic, igneous rock. Granites are usually medium to coarsely crystalline, occasionally with some individual crystals larger than the groundmass forming a rock known as porphyry. Granites contain little ferromagnesian minerals (biotite, hornblende, and augite). Granites are largely leucocratic rocks, usually pale gray or pink, depending on the color of feldspars, for example, presence of pink microcline granite looks pink. It occurs mostly in the form of huge batholiths, stock, but rarely laccolith (Fig. 4.5). Granite has a felsic composition and is more common in recent geologic time in contrast to Earth's ultramafic ancient igneous history. Felsic rocks are less dense than mafic and ultramafic rocks, and thus they tend to escape subduction, whereas basaltic or gabbroic rocks tend to sink into the mantle beneath the granitic rocks of the continental cratons. Oct 01, 2018 The radioactive heat production of granite rocks (rhp in μW.m −3) can be calculated by taking into account the heat generation constant (amount of heat released per gram U, Th and K per unit time) and from the uranium, thorium and potassium concentrations C U, C Th, C K present in rock (Cermak, Huckenholz, Rybach, & Schmid, 1982; Rybach Tectonically created fractures are the key to production, so that granites are better reservoir prospects than basalts and quartzites are favored over more ductile schists. In oil exploration, igneous and metamorphic rocks are often collectively grouped as "crystalline rocks".
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