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Clear Creek Reservoir Occurrence (Eagle Cap Wilderness), Wallowa Range District, Baker Co., Oregon, USA

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Latitude & Longitude (WGS84): 45° 4' 6'' North , 117° 8' 32'' West
Latitude & Longitude (decimal): 45.0683333333, -117.142222222

Commodities (Major) - Silver
Development Status: Occurrence
Host Rock: Greenstone

Mineral List

3 valid minerals.

Rock Types Recorded

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Alphabetical List Tree Diagram

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Triassic - Permian
201.3 - 298.9 Ma
Wallowa Terrane; Clover Creek Greenstone

Age: Phanerozoic (201.3 - 298.9 Ma)

Description: Imnaha Formation, Norway member; 6000ft-8000ft thick; sedimentary/volcanic rocks; greenstone; mixed lithologies; mixed; mixed crystals/grains; mixed

Lithology: Major:: {lithic tuff, purple; facies: greenschist; recrystallization: metamorphic}; Major:: {welded tuff, light gray; quartz sodic oligoclase grains; matrix: fine quartz-albite-sericite}; Major:: {lithic siltstone, light gray, green, purple; quartz plagioclase lithic grains; vesicle fill: calcite greenschist assemblages; matrix: recrystallized clouded by leucoxene; volcanic fragments}; Major:: {feldspathic siltstone, light gray, green, purple; volcanic lithic fragments; quartz plagioclase lithic grains; vesicle fill: calcite greenschist assemblages; matrix: recrystallized clouded by leucoxene}; Major:: {lithic graywacke, green, purple, light gray}; Major:: {feldspathic graywacke, green, purple, light gray; volcanic lithic infrequent sedimentary grains}; Major:: {gravel, light gray, green, purple}; Major:: {spilite flows, dark; vesicle fill: biotite-chlorite-epidote aggregates; facies: greenschist; mineralization: iron}; Major:: {andesite flows, dark; vesicle fill: biotite-chlorite-epidote aggregates; facies: greenschist; mineralization: iron}; Major:: {calcareous conglomerate, light gray, green, reddish white, purple; cementation: calcareous; facies: greenschist}; Major:: {chert, dark red}; Major:: {volcanic siltstone}; Major:: {pillow breccia, dark-colored aphanitic lava volcanic fragments; vesicle fill: greenschist mineral biotite; matrix: sandy somewhat calcareous; chlorite clasts}; Major:: {greenschist, recrystallization: metamorphic}; Major:: {siliceous mudstone, angular quartz angular plagioclase fragments; matrix: silicified; sedimentary grains}

Reference: R.L. Smith, W.P. Roe (compilers). Oregon Geologic Data Compilation, release 6. State of Oregon Department of Geology and Mineral Industries. [20]

Carnian - Late Triassic
228 - 237 Ma
Volcanic and metavolcanic rocks

Age: Late Triassic (228 - 237 Ma)

Stratigraphic Name: Huntington Formation

Description: Green to gray spilite and keratophyre flows and flow breccia; and subordinate amounts of coarse volcaniclastic sandstone, tuff, sandstone, siltstone, chert, conglomerate, and limestone. Marine fauna from interlayered sedimentary rocks indicates unit is mostly of Karnian (Late Triassic) age. Includes Late Triassic "andesitic and basaltic rocks" of Nolf and Taubeneck (1963), and the basaltic to rhyolitic metavolcanic rocks and interbedded sedimentary rocks of the Huntington Formation of Brooks (1979). Equivalent, in part, to unit TrPv

Comments: Huntington Formation (OR073) is predominantly agglomerate, tuff, and flows intercalated with coarse volcaniclastic breccia and conglomerate. Also contains volcanic graywacke, volcanic arenite, water-laid tuff, volcanic siltstone, and minor limestone. Volcanic rocks range from basalt to rhyolite; andesite is the most common lithology. Fine-grained sedimentary rocks typically form bedded sequences ranging from a few meters to a few hundred meters thick. Includes dikes, sills, and irregular shallow intrusive bodies that are difficult to distinguish from extrusive rocks. The rocks have been metamorphosed to the zeolite and greenschist facies of regional metamorphism. Fossil ammonites and Halobia indicate marine depositioon and late Carnian to late middle Norian (late Triassic) age (OR073). A Lead-uranium age of 235 Ma for an intrusive tonalite in the Huntington Formation indicates that part of the unit is Middle Triassic or older (OR190). The unit is interpreted as a product of a Triassic volcanic arc that makes up the Olds Ferry terrane (OR089)..

Lithology: Major:{spilite,volcanic}, Minor:{sandstone,siltstone,chert,conglomerate,limestone, metavolcanic}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

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