Preliminary reconnaissance geologic map of the Cleveland Mountain and north half of the Ravenna quadrangles (1:48,000), western Montana

Wallace, C.A.; Klepper, M.R.

doi:10.3133/ofr76527

Cited by 3 publications

(3 citation statements)

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“…Wallace, 1978, written commun.). That zone extends over a width of 10 to 15 km (Wallace and Klepper, 1976).…”

Section: The Sapphire Tectonic Blockmentioning

confidence: 99%

Bitterroot dome-Sapphire tectonic block, an example of a plutonic-core gneiss-dome complex with its detached suprastructure

Hyndman¹

1980

Geological Society of America Memoirs

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The Bitterroot dome-Sapphire tectonic block appears to be a well-developed example of a plutoniccore gneiss-dome complex or infrastructure separated from the adjacent suprastructure by a gently dipping zone of mylonitic shearing or an "Abscherungszone." The suprastructural Sapphire block, on the order of 15 km thick, 100 km long, and 70 km wide, apparently moved eastward about 60 km, bulldozing rocks of the eastern Flint Creek Range ahead of it. Movement of the block must have occurred about 75 or 80 m.y. ago during late stages of consolidation of the Idaho batholith which, along with sillimanite-zone regional metamorphic rocks, makes up the infrastructure under the mylonitic detachment zone. Timing of movement in the Sapphire block matches that in the Bitterroot dome.The Bitterroot dome must have risen after off-loading of the Sapphire block, because the shear foliation and lineation that formed during movement completely cross the dome; this indicates that the block must have moved eastward across the whole of the area now occupied by the dome rather than radially down the flanks of an existing dome. The shear lineation maintains its eastward trend even at the south end of the dome where the foliation dips southward. The lineation and shear foliation are strongest along the eastern flank of the dome, over which the greatest thickness of the block would have passed.

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“…Wallace, 1978, written commun.). That zone extends over a width of 10 to 15 km (Wallace and Klepper, 1976).…”

Section: The Sapphire Tectonic Blockmentioning

confidence: 99%

Bitterroot dome-Sapphire tectonic block, an example of a plutonic-core gneiss-dome complex with its detached suprastructure

Hyndman¹

1980

Geological Society of America Memoirs

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“…Alt and Hyndman (1980) Mutch (1961), Ruppel (1961), and Wanek and Barclay (1966) studied in detail the geology of an area south and west of Garrison. Gwinn (1961), Kauffman (1963), Konizeski (1965), Fields and Shepard (1965), Montgomery (1958), Nelson and Dobell (1959), Rasmussen (1969), Wallace and Klepper (1976), and Wheeler (1974) described the geology of the area between Garrison and Milltown. Alden (1953) described the glacial geology of the entire study area.…”

Section: Previous Investigationsmentioning

confidence: 99%

Hydrology and water chemistry of shallow aquifers along the upper Clark Fork, western Montana

Nimick¹

1993

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“…Desormier (1973) conducted geologic investigations north of the wilderness, along the northern border of the Sapphire thrust plate. Wallace and Klepper (1976) published a preliminary geologic map that includes the wilderness.…”

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confidence: 99%

Mineral resource potential map of the Welcome Creek Wilderness, Granite County, Montana

Lidke¹,

Wallace²,

Antweiler³

et al. 1983

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Preliminary reconnaissance geologic map of the Cleveland Mountain and north half of the Ravenna quadrangles (1:48,000), western Montana

Cited by 3 publications

References 0 publications

Bitterroot dome-Sapphire tectonic block, an example of a plutonic-core gneiss-dome complex with its detached suprastructure

Bitterroot dome-Sapphire tectonic block, an example of a plutonic-core gneiss-dome complex with its detached suprastructure

Hydrology and water chemistry of shallow aquifers along the upper Clark Fork, western Montana

Mineral resource potential map of the Welcome Creek Wilderness, Granite County, Montana

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