Evolution of hydrothermal fluids in intrusions of the central Wasatch Mountains, Utah

Thesis/Dissertation · Thu Jan 01 00:00:00 EST 1987

OSTI ID:6443613

John, D A

Fourteen mid-Tertiary calc-alkalic stocks and coeval volcanic rocks are exposed in a 45-km-long belt across the central Wasatch Mountains. Fluid inclusions in igneous quartz vary systematically with paleodepth; high salinity (halite-saturated) fluid inclusions are limited to paleodepths 600 C from high salinity (>/= 82 wt. % NaCl + KCl) brines. Lower temperature, hydrolytic wall-rock alteration is zoned outward from albite-sericite to sericite to kaolinite/dickite to propylitic assemblages. Alunite and pyrophyllite assemblages are superimposed locally, suggesting two stages of alteration; early chloride-dominated fluids and later sulfate-rich fluids.

• Research Organization: Stanford Univ., CA (USA)
• OSTI ID: 6443613
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
HYDROTHERMAL SYSTEMS
GEOLOGIC HISTORY
ORIGIN
UTAH
HYDROTHERMAL ALTERATION
INCLUSIONS
MINERALOGY
MOUNTAINS
PALEOTEMPERATURE
RESERVOIR FLUIDS
SALINITY
VOLCANIC ROCKS
ENERGY SYSTEMS
FEDERAL REGION VIII
FLUIDS
GEOTHERMAL SYSTEMS
IGNEOUS ROCKS
NORTH AMERICA
ROCKS
USA
150201* - Geology & Hydrology of Geothermal Systems- USA- (-1989)