Form and composition of secondary mineralization in fractures in Columbia River basalts

Conference · Thu May 01 00:00:00 EDT 1986

OSTI ID:6693317

McKinley, J P; Rawson, S A; Horton, D G

Examination of basalt alteration rinds suggests that pyroxene is altered, along with mesostasis, from the inception of hydrothermal alteration along cooling fractures in Columbia River basalts. The only phyllosilicate secondary mineral in fractures is trioctahedral smectite of Fe-saponite composition, throughout the examined thickness of the basalt column. This smectite is compositionally distinct from the minor amounts of mesostasis smectite found in otherwise unaltered outcrop samples of basalt.

• Research Organization: Rockwell International Corp., Richland, WA (USA). Rockwell Hanford Operations
• DOE Contract Number: AC06-77RL01030
• OSTI ID: 6693317
• Report Number(s): RHO-BW-SA-565-P; CONF-860829-40; ON: DE87007395
• Country of Publication: United States
• Language: English

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ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
BASALT
CHEMICAL COMPOSITION
CLAYS
COLUMBIA RIVER BASIN
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
IGNEOUS ROCKS
MATURATION
MINERALIZATION
MINERALS
OXYGEN COMPOUNDS
PASCO BASIN
PYROXENES
ROCKS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SMECTITE
VOLCANIC ROCKS