Geology of Seward Peninsula and Saint Lawrence Island

Till, Alison B.; Dumoulin, Julie A.

doi:10.1130/dnag-gna-g1.141

Cited by 31 publications

(44 citation statements)

References 17 publications

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“…Rising south from sea level, the Preserve's southern boundary follows the crest of the Bendeleben Mountains to a height of 1040 m elevation. Adding unique geology to an otherwise metamorphic landscape, dolomite rocks outcrop along the east and western boundaries of the Preserve, and historic volcanic activity sprinkles the north and central portions of the Seward Peninsula (Till and Dumoulin 1994). The most notable volcanic features in the Preserve, however, are the basaltic lava flows in the central Seward Peninsula.…”

Section: Study Sitementioning

confidence: 99%

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Succession and community gradients of arctic macrolichens and their relation to substrate, topography, and rockiness

Holt¹

2007

North Amer. Fungi

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We describe lichen community structure and its relation to environment in the Bering Land Bridge National Preserve in northwestern Alaska. We used a stratified random sample to estimate macrolichen abundance and several environmental variables from 78 0.38-ha plots within lichendominated areas of the Preserve. We found a total of 140 macrolichen taxa. Two primary gradients in lichen species composition were related to habitat rockiness and a substrate-topographic gradient. The strongest gradient, rockiness, correlates with lichen succession. Rocky habitats have less competition from vascular plants and may be more resistant to soil disturbance. The substrate-topography gradient is largely driven by the presence of Sphagnum moss contrasting with calcareous parent rock material. To uncover additional underlying patterns in lichen community composition, we deleted rocky and calcareous plots and strictly saxicolous species from the analyses. Although we found similar patterns from the original analysis in this subset, diversity and community composition also varied with differing microtopography. These gradients of lichen community composition can also be divided into three major groups; rocky non-calcareous sites, calcareous areas, and the remaining plots form the alluvial lowland communities. We used two-way cluster analysis which combines independent clustering of sample units and species into a single diagram. This technique linked individual species and species assemblages with these major trends.

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Section: Study Sitementioning

confidence: 99%

“…The bedrock of the Preserve ranges from volcanic basalts to stratified sedimentary rocks (Till and Dumoulin 1994). The major rock types, as a categorical variable, were strongly patterned on the ordination and differed in lichen community composition (Fig.…”

Section: Substrate and Topographic Gradientmentioning

confidence: 99%

Succession and community gradients of arctic macrolichens and their relation to substrate, topography, and rockiness

Holt¹

2007

North Amer. Fungi

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“…orthogneiss [Till and Dumoulin, 1994]. Previous studies of the geology of the Kigluaik Mountains include U.S. Geological Survey (USGS) reconnaissance mapping [Brooks et al, 1901;Moffit, 1913;Hummel, 1962 [Till et al, 1986].…”

mentioning

confidence: 99%

“…Previous studies of the geology of the Kigluaik Mountains include U.S. Geological Survey (USGS) reconnaissance mapping [Brooks et al, 1901;Moffit, 1913;Hummel, 1962 [Till et al, 1986]. The Nome Group [Till and Dumoulin, 1994] and, presumably, the Kigluaik Group were metamorphosed to blueschist facies and greenschist facies in a high-pressure and low-temperature event which occurred before -120 Ma [Hannula and McWilliarns, 1995]. Sometime between 105 and 90 Ma, but likely closer to 91 Ma [Amato et al, 1994; Amato and Wright, 1997], upper amphibolite-facies to granulitefacies metamorphism associated with the development of the gneiss dome achieved peak conditions of 800-850øC and 0.8-1.0 GPa in the Kigluaik Group [Moffit, 1913;Throckmorton and Hummel, 1979;Lieberman, 1988] and caused thermal overprinting of blueschist-facies rocks.…”

mentioning

confidence: 99%

Potassic mafic magmatism in the Kigluaik gneiss dome, northern Alaska: A geochemical study of arc magmatism in an extensional tectonic setting

Amato¹,

Wright²

1997

J. Geophys. Res.

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“…In this area, Cenozoic deposits rest unconformably on Paleozoic metasedimentary rocks ( fig. 3) similar to metasedimentary rocks widely exposed on the Seward Peninsula (Till and Dumoulin, 1994).…”

Section: Geologic Setting and Stratigraphymentioning

confidence: 87%

Geology and assessment of undiscovered oil and gas resources of the Hope Basin Province, 2008

Bird¹,

Houseknecht²,

Pitman³

2017

Professional Paper

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For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment-visit https://www.usgs.gov or call 1-888-ASK-USGS.For an overview of USGS information products, including maps, imagery, and publications, visit https://store.usgs.gov.Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. AbstractThe Hope Basin, an independent petroleum province that lies mostly offshore in the southern Chukchi Sea north of the Chukotka and Seward Peninsulas and south of Wrangel Island, the Herald Arch, and the Lisburne Peninsula, is the largest in a series of postorogenic (successor) basins in the East SiberianChukchi Sea region and the only one with exploratory-well control and extensive seismic coverage.In spite of the seismic coverage and well data, the petroleum potential of the Hope Basin Province is poorly known. The adequacy of hydrocarbon charge, in combination with uncertainties in source-rock potential and maturation, was the greatest risk in this assessment. A single assessment unit was defined and assessed, resulting in mean estimates of undiscovered, technically recoverable resources that include ~3 million barrels of oil and 650 billion cubic feet of nonassociated gas.

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Geology of Seward Peninsula and Saint Lawrence Island

Cited by 31 publications

References 17 publications

Succession and community gradients of arctic macrolichens and their relation to substrate, topography, and rockiness

Succession and community gradients of arctic macrolichens and their relation to substrate, topography, and rockiness

Potassic mafic magmatism in the Kigluaik gneiss dome, northern Alaska: A geochemical study of arc magmatism in an extensional tectonic setting

Geology and assessment of undiscovered oil and gas resources of the Hope Basin Province, 2008

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