Hydrothermal alteration at the Roosevelt Hot Springs Thermal Area, Utah: petrographic characterization of the alteration to 2 kilometers depth

Technical Report · Sat Apr 01 04:00:00 EST 1978

OSTI ID:6615273

Ballantyne, J M; Parry, W T

Hydrothermal alteration in drill cuttings from Thermal Power drillhole 14-2, Roosevelt Hot Springs Thermal area, was studied petrographically. The hole is sited in alluvium approximately 1.6 km southeast of the old resort and was rotary drilled to a depth of 1866.0 m. Hydrothermal alteration has affected all rocks in the drillhole. Original rock textures are generally preserved. Significant changes in alteration mineralogy and intensity, which do not appear to be rock-type dependent, were observed. Alteration was described in three ways: pervasive alteration mineralogy was described by determining the alteration products of each of the major mineral species; vein and fracture fillings were described where recognized; and intensity of alteration was described by estimating the amount of destruction of major mineral species. Because of the nature of the samples (cuttings) the relationships of mineralogy and intensity to veins and fractures cannot be determined, but overall patterns clearly emerge. Mineral types identified include plagioclase, hornblende, biotite, sphene, and sulfides. (JGB)

• Research Organization: Utah Univ., Salt Lake City (USA). Dept. of Geology and Geophysics
• OSTI ID: 6615273
• Report Number(s): IDO-78-170.a.1.1
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
150201* -- Geology & Hydrology of Geothermal Systems-- USA-- (-1989)
152003 -- Geothermal Data & Theory-- Rock-Water-Gas Interactions
ALKALINE EARTH METAL COMPOUNDS
ALLUVIAL DEPOSITS
AMPHIBOLE
ANDESITES
ANHYDRITE
ANORTHOSITES
BIOTITE
CALCIUM COMPOUNDS
CALCIUM SULFATES
CHALCOGENIDES
DATA FORMS
DRILL CORES
FELDSPARS
GEOLOGIC DEPOSITS
GEOLOGICAL SURVEYS
HORNBLENDE
HOT SPRINGS
HYDROTHERMAL ALTERATION
IGNEOUS ROCKS
IRON COMPOUNDS
IRON ORES
IRON OXIDES
KGRA
LIMONITE
LITHOLOGY
MICA
MINERALOGY
MINERALS
NORTH AMERICA
ORES
OXIDES
OXYGEN COMPOUNDS
PETROGRAPHY
ROCKS
ROCKY MOUNTAIN REGION
SULFATES
SULFIDES
SULFUR COMPOUNDS
TABLES
THERMAL SPRINGS
TITANITE
TRANSITION ELEMENT COMPOUNDS
USA
UTAH
VOLCANIC ROCKS