Subsurface geology of the Raft River geothermal area, Idaho

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Conference Proceedings: Subsurface geology of the Raft River geothermal area, Idaho

The Raft River Valley occupies an upper Cenozoic structural basin filled with nearly 1600 m of fluvial silt, sand, and gravel. Rapid facies and thickness changes, steep initial dips (30 0C), and alteration make correlation of basin-fill depositional units very difficult. Hydrothermal alteration products in the form of clays and zeolites, and deposition of secondary calcite and silica increase with depth. The abundance of near-vertical open fractures also increases with depth, allowing greater movement of hydrothermal fluids near the base of the Cenozoic basin fill. The basin is floored with quartzites and schists that can be correlated with formations in the nearby Raft River Range. Beneath these rocks is a Precambrian adamellite basement complex. The Raft River geothermal system is a hot water convective system relying on deep circulation of meteoric water in a region of high geothermal gradients and open fractures near the base of the Tertiary basin fill.

Covington and H. R.  

Geothermal Resource Council Transactions 1980, 9/1/1980

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Covington, H. R.  . 9/1/1980. Subsurface geology of the Raft River geothermal area, Idaho. Proceedings of (!) ; (!) : Geothermal Resource Council Transactions 1980.

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