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Phreatic breccias, as exemplified by pebble dikes, normally contain polymictic clast populations set in muddy, rock-flour matrices (Table 1). Vertical clast transport may be apprecia-ble (e.g., >1 km at Tintic; Morris and Lovering, 1979). The breccias are typically late-stage features and, hence, unal-tered and barren.
Several criteria, in addition to metal contents and ratios (Cu/Au/Mo) and intensity of veining, alteration, and mineralization, are used to distinguish the relative ages of porphyry intrusions: younger phases truncate veinlets in, are chilled against, and contain xenoliths of older phases (Fig. 7; Sillitoe, 2000).
Porphyry copper deposits provide around 75% of the world’s copper and are an important source of gold and other metals (Sillitoe 2010). One aspect of porphyry deposit models that is poorly understood …
Sistemas de Pórfidos Cupriferos - Richard H. Sillitoe - 2010 | PDF | Roca (geología) | Cobre. Este documento resume los sistemas de pórfidos cupríferos, que alojan algunos de los tipos de mineralización más ampliamente distribuidos en los límites de placa convergente. Los sistemas se forman... by leonel_coaguila.
Richard H. Sillitoe. Porphyry copper systems (in A group of papers on porphyry Cu deposits, Lawrence D. Meinert) Economic Geology and the Bulletin of the Society of Economic Geologists (January 2010) 105 (1): 3-41. Index Terms/Descriptors. alteration. copper ores. dike swarms. dikes. giant deposits. global. gold ores. intrusions. magmas.
22 de mar. de 2010 · Porphyry Copper Systems. March 2010. Economic Geology 105 (1):3-41. DOI: 10.2113/gsecongeo.105.1.3. Authors: Richard H Sillitoe. To read the full-text of this research, you can request a copy...
Biblioteca en línea. Materiales de aprendizaje gratuitos. lOMoARcPSD|9052041 Sillitoe 2010 traducido Introducción a la geología (Universidad Nacional Andrés Bello) Studocu is not sponsored or endorsed by any college or university Downloaded by Jhan Carlos Alania Aldana ([email protected][email protected]
