Economic Geology : Hydrothermal Processes Related to Movement of Fluid From Plastic

Jun 30th, 2015
Studypool Tutor
Price: $10 USD

Tutor description

Repeated intrusions of magma to depths of 2 to 6 km beneath a volcanic complex result in a large body of surrounding rock attaining temperatures sufficiently hot (>400°C) for crustal rocks to behave in a plastic man¬ner at normal strain rates, =10-14 sec-1. Where the least principal stress is the lithostatic load, hypersaline brine and gas exsolved

Word Count: 13181
Showing Page: 1/21
Economic GeologyBULLETIN OF THE SOCIETY OF ECONOMIC GEOLOGISTSVol. 94December 1999No. 8Hydrothermal Processes Related to Movement of Fluid From Plastic into Brittle Rockin the Magmatic-Epithermal EnvironmentRobert O. Fournier*108 Paloma Road, Portola Valley, California 94028AbstractRepeated intrusions of magma to depths of 2 to 6 km beneath a volcanic complex result in a large body of surrounding rock attaining temperatures sufficiently hot (>400C) for crustal rocks to behave in a plastic manner at normal strain rates, =10-14 sec-1. Where the least principal stress is the lithostatic load, hypersaline brine and gas exsolved from crystallizing magma accumulate at lithostatic pressure within this plastic rock in horizontal lenses. A narrow, self-sealed zone of relatively impermeable material separates the lithostatically pressured region from a region where meteoric-derived hydrothermal fluids circulate through brittle rock at hydrostatic pressure. Episodically, major breaches of the self-sealed zone occur, and several different mechanisms may play a role in triggering such a breach. A particularly likely mechanism is an upward surge in magma that temporarily increases the local strain rate to such a degree that previously plastic material undergoes shear failure in response to a very small stress difference. This allows hypersaline brine and gas to be expelled quickly from the normally plastic region into the brittle, lower pressure and lower temperatu

Review from student

Studypool Student
" Thanks, good work "
Ask your homework questions. Receive quality answers!

Type your question here (or upload an image)

1819 tutors are online

Brown University





1271 Tutors

California Institute of Technology




2131 Tutors

Carnegie Mellon University




982 Tutors

Columbia University





1256 Tutors

Dartmouth University





2113 Tutors

Emory University





2279 Tutors

Harvard University





599 Tutors

Massachusetts Institute of Technology



2319 Tutors

New York University





1645 Tutors

Notre Dam University





1911 Tutors

Oklahoma University





2122 Tutors

Pennsylvania State University





932 Tutors

Princeton University





1211 Tutors

Stanford University





983 Tutors

University of California





1282 Tutors

Oxford University





123 Tutors

Yale University





2325 Tutors