On the western margin the formation of a granodiorite intrusion body with a surface area of was accompanied by hydrothermal alteration . northeast of the caldera lies the dacitic Sierra Los Chilenos structure.
42.
However, serpentinite synthesis and spinel cracking reactions require hydrothermal alteration of pristine peridotite-dunite, which is a finite process intrinsically related to metamorphism, and further, requires significant addition of water.
43.
Similarly, magnetite, hematite and often pyrrhotite are common minerals associated with hydrothermal alteration, and this alteration can be detected to provide an inference that some mineralising hydrothermal event has affected the rocks.
44.
Lava flows found on Escorial and Cerro Corrida de Cori are the latest volcanic events and post-date the hydrothermal alteration; one date from Escorial is 0.342 ?0.025 mya.
45.
The Pascua ore body is located in the Nevada mineral zone or Nevada hydrothermal alteration zone which is part of a regional area of gold-bearing hydrothermal alteration zones known as El Indio or Eastern belt.
46.
The Pascua ore body is located in the Nevada mineral zone or Nevada hydrothermal alteration zone which is part of a regional area of gold-bearing hydrothermal alteration zones known as El Indio or Eastern belt.
47.
Overall, the presence of tonalite-trondhjemite-granodiorites, as well as the iron present for the banded iron formations ( BIFs ), are determined to have been caused by hydrothermal alteration at high temperatures.
48.
The Altered Zone unexcelled in the Colorado Plateau for showing the effects of hot water or hydrothermal alteration of igneous rocks and the development of clays in the weathering process associated with the late phases of igneous activity.
49.
The Kalamazoo portion of the deposit was discovered by an exploration drilling program based on the " missing " portion of the presumed symmetrical hydrothermal alteration / mineralization pattern of the San Manuel portion of the deposit.
50.
Hydrothermal alteration of the central lava dome and iron-bearing deposits has generated alunite, anatase, chlorite, copper veinlets, gypsum, illite, jarosite, labradorite, quartz, rutile, sanidine, smectite, and sulfur.
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