James Gilluly

James Gilluly (June 24, 1896 – December 29, 1980) was an American geologist.

Regarding the Cupriferous Porphyry Genesis, Gilluly integrated detailed observations of the Ajo porphyry between 1936 and 1936 with experimental data (Goranson, 1931, Gilluly, 1937). Gilluly concluded that after the Ajo quartz monzonite intruded and crystallized, it was fractured by magmatic bypass solutions (p. 73). Gilluly frequency experimental restrictions to estimate a paleo depth between 1000 and 3000 (m) (average 2000 (m) or 0.5 kbar at lithostatic pressure), consistent with solidus temperatures of 900 °C for granite, containing 4% by weight of water. He realized that the source magmatic content was water, sulfur and halogens, and that the binders can form complexes with metals to produce an aqueous fluid with larger volumes. On the other hand, one can also count on the fact that volatiles decrease the solubility of water in magma and the vapor pressure of expelled fluid could fracture the wedge-shaped dome made of country rock and solidified magma. This is summarized in the discharges of magmatic fluids corresponding to continuous processes that lead to the accumulation of fluids in intercourse, which maintains an intermittent fracturing., The influence of Geochemical Techniques on the Development of Genetic Models for Porphyry Copper Deposits, published in the Vol. 10 of the Reviews in Economic Geology de la Society of Economic Geologists.