Generalized geologic map of the Wiseman quadrangle, Alaska

Dillon, John T.; Brosge, W.P.; Dutro, J. Thomas

doi:10.3133/ofr86219

Cited by 36 publications

(51 citation statements)

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“…Its character and position are known only from a single exposure about 80 km west of the transect [Dillon et al, 1986;Dillon, 1989]. The fault appears to mark the northern limit of mid-Cretaceous plutonism, which is widespread in central Alaska [Miller, 1994], suggesting that it may represent a fundamental post-midCretaceous boundary.…”

Section: Rocks Of the Endicott Mountains Allochthon In The Elumentioning

confidence: 99%

Crustal implications of bedrock geology along the Trans‐Alaska Crustal Transect (TACT) in the Brooks Range, northern Alaska

Moore¹,

Wallace²,

Mull³

et al. 1997

J. Geophys. Res.

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Section: Rocks Of the Endicott Mountains Allochthon In The Elumentioning

confidence: 99%

Crustal implications of bedrock geology along the Trans‐Alaska Crustal Transect (TACT) in the Brooks Range, northern Alaska

Moore¹,

Wallace²,

Mull³

et al. 1997

J. Geophys. Res.

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“…We have expanded on earlier work Reiser, 1964, 1971;Dillon et al, 1986Dillon et al, , 1987Dillon et al, , 1988Oldow et al, 1987) and have identified several fundamental structural units or allochthons that compose the internal part of the fold and thrust belt. As used here, an allochthon is viewed as a coherent structural unit composed of numerous thrust sheets.…”

Section: Introductionmentioning

confidence: 92%

Stratigraphy and paleogeographic setting of the eastern Skajit allochthon, central Brooks Range, Arctic Alaska

Oldow¹,

Boler²,

Lallemant³

et al. 1998

Architecture of the Central Brooks Range Fold and Thrust Belt, Arctic Alaska

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The Skajit allochthon of the south-central Brooks Range is one of the structurally highest units in the late Mesozoic and Cenozoic fold and thrust belt and overlies metasedimentary rocks of the EndicottMountains allochthon on the north and metamorphic tectonites of the Schist belt to the south. The Skajit allochthon is deformed internally in a complex array of folds and thrusts and is composed of two, partially coeval, stratigraphic sequences. The stratigraphic sequences are composed of metamorphosed fine-to coarse-grained siliciclastic, volcanogenic, and volcanic rocks and thin-bedded to massive carbonate units. The two stratigraphic sequences, which constitute numerous imbricate sheets, are spatially segregated into a lower and upper assemblage of thrust nappes. The structurally lower sequence is composed of intercalated shallow-marine to platformal carbonates and fine-to coarse-grained siliciclastic rocks of Middle Cambrian to early Late Devonian age. The clastic and carbonate rocks are conformably overlain by a post-lower Upper Devonian succession of fine-grained siliciclastic and thin-bedded carbonates. The stratigraphic sequence of the structurally higher nappes is composed of fine-to coarse-grained siliciclastic and volcanogenic rocks and subordinate thin-bedded carbonate rocks of Early or Middle Ordovician to early Late Devonian age. The two lower Paleozoic sequences substantially overlap in age but were deposited in distinctly different depositional environments. The Cambrian to Devonian carbonate succession was deposited in a carbonate platform or shelf environment, whereas the partially coeval siliciclastic, carbonate, and volcanic succession is of basin affinity. Paleogeographic restoration of the imbricate thrust sheets places the carbonate succession to the north of the siliciclastic sequence. The carbonate rocks of the shelf succession are the apparent source of fine-grained carbonate mud and occasional carbonate olistoliths found within the basin sequence. Siliciclastic detritus intercalated within the shallow-marine carbonates of the shelf

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“…A second, older assemblage of metamorphosed carbonates, clastics, and volcanics intruded by Proterozoic granitic plutons is exposed along strike to the west in the Baird Mountains Quadrangle (Karl et al, 1989;Turner et al, 1979;. South of the Skajit allochthon, the Schist Belt and Rosie Creek allochthons are composed of thrust sheets containing metasedimentary and metaigneous rocks of Proterozoic through late Paleozoic age (Oldow et al, 1987;Gottschalk et al, this volume, Chapter 12;Moore et al, 1994;Dillon et al, 1986).…”

Section: Southern Brooks Rangementioning

confidence: 99%

Regional stratigraphy of the Brooks Range and North Slope, Arctic Alaska

Handschy¹

1998

Architecture of the Central Brooks Range Fold and Thrust Belt, Arctic Alaska

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The stratigraphy of northern Alaska records a complex paleogeographic and tectonic history. In general, the pre-Mississippian stratigraphic section is more complicated and controversial than the younger strata. It records a long period of mixed carbonate and clastic deposition, at least one pre-Mississippian collisional orogenic event, and a Late Devonian rifting event. Mississippian to Jurassic depositional patterns reflect the evolution of a south-facing passive margin, whereas Late Jurassic and younger sedimentation was controlled by plate convergence and formation of the Brooks Range fold-thrust belt. Understanding the paleogeographic distribution of stratigraphic facies in the Brooks Range is critical for deciphering the palinspastic history of the Brookian fold-thrust belt.

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Generalized geologic map of the Wiseman quadrangle, Alaska

Cited by 36 publications

References 0 publications

Crustal implications of bedrock geology along the Trans‐Alaska Crustal Transect (TACT) in the Brooks Range, northern Alaska

Crustal implications of bedrock geology along the Trans‐Alaska Crustal Transect (TACT) in the Brooks Range, northern Alaska

Stratigraphy and paleogeographic setting of the eastern Skajit allochthon, central Brooks Range, Arctic Alaska

Regional stratigraphy of the Brooks Range and North Slope, Arctic Alaska

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