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Title: GEOLOGIC AND GEOCHEMICAL INVESTIGATIONS OF THE MEAGER CREEK GEOTHERMAL SYSTEM, BRITISH COLUMBIA, CANADA

Meager Creek is perhaps the most intensely explored geothermal system occurring in the Cascade and Garibaldi Volcanic Belts. This paper describes the results of new lithologic, petrographic, X-ray, isotopic, and geochemical investigations of core and cuttings from the Meager Creek wells. The data demonstrate that alteration related to the present geothermal system is superimposed on basement rocks which were metamorphosed and intruded by dioritic stocks prior to the onset of volcanism. The geothermal alteration developed mainly after emplacement of hypabyssal dikes associated with Meager Mountain volcanism and is characterized by mineral assemblages consisting primarily of sheet silicates, quartz, carbonate, hematite, iron oxides, pyrite, and minor epidote, potassium feldspar, actinolite and biotite. Permeabilities within the upper portions of the reservoir are low, reflecting filling of the fracture systems by carbonate. Petrographic observations suggest that sealing of the fractures accompanied hydrothermal brecciation and boiling of the fluids.
Authors:
; ;
Publication Date:
OSTI Identifier:
892566
Report Number(s):
SGP-TR-84; CONF-850107-41
TRN: US200623%%345
Resource Type:
Conference
Resource Relation:
Conference: 10. annual workshop on geothermal reservoir engineering, Stanford, CA (US), 01/22/1985
Research Org:
Earth Science Laboratory, University of Utah Research Institute
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 15 GEOTHERMAL ENERGY; BASEMENT ROCK; BIOTITE; BOILING; BRITISH COLUMBIA; CANADA; GEOTHERMAL SYSTEMS; HEMATITE; IRON OXIDES; POSITIONING; POTASSIUM; PYRITE; QUARTZ; RESERVOIR ENGINEERING; SILICATES; STREAMS; VOLCANISM; Geothermal Legacy