Preliminary geologic map and fossil data, Solomon, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska

Till, Alison B.; Dumoulin, Julie A.; Gamble, Bruce M.; Kaufman, Darrell S.; Carroll, P.I.

doi:10.3133/ofr86276

Cited by 39 publications

(6 citation statements)

References 7 publications

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“…The metasedimentary protolith of these rocks is Paleozoic or older, because U/Pb zircon ages from orthogneisses within the Etelchvyleut Series in the core of the dome yielded ages of 370 and 375 Ma (Natal'in et al, 1999). Lithologically, the metamorphic succession of the Lavrentiev Series is similar to the lower Paleozoic units of the Chegitun Unit of Natal'in et al (1999) and probably the Proterozoic to Paleozoic rocks of the Seward Peninsula (Till et al, 1986). All rocks in the Koolen dome have undergone amphibolite facies metamorphism; mapped isograds indicate metamorphic conditions ranging from Sil + Grt + Bt + Qtz + Kfs in the core of the dome to Sil + Grt + Bt + Qtz + Ms ± St at its periphery.…”

Section: Koolen Dome Settingsupporting

confidence: 57%

“…Where studied in detail, these metamorphic culminations (gneiss domes) on the Chukotka and Seward Peninsulas generally show limited evidence for relatively high-pressure (P)low-to-moderate-temperature (T) Jurassic (?) to Cretaceous metamorphism overprinted by higher-T Late Cretaceous metamorphism (Table 1; Till et al, 1986;Patrick and Lieberman, 1988;Gelman, 1995).…”

Section: Regional Geologic Settingmentioning

confidence: 99%

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Cretaceous mid-crustal metamorphism and exhumation of the Koolen gneiss dome, Chukotka Peninsula, northeastern Russia

Akinin¹,

Calvert²

2002

Tectonic Evolution of the Bering Shelf-Chukchi Sea-Artic Margin and Adjacent Landmasses

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Section: Koolen Dome Settingsupporting

confidence: 57%

Section: Regional Geologic Settingmentioning

confidence: 99%

Cretaceous mid-crustal metamorphism and exhumation of the Koolen gneiss dome, Chukotka Peninsula, northeastern Russia

Akinin¹,

Calvert²

2002

Tectonic Evolution of the Bering Shelf-Chukchi Sea-Artic Margin and Adjacent Landmasses

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“…Active layer depths were not measured in 2016 or 2017, so the temporal relationship between active layer depth and catchment C – Q dynamics could not be studied, but we would highly recommend future studies include active layer depth dynamics to their catchment scale C – Q studies. Geological surveys indicate that the catchment geology is mixed marble, graphitic metasiliceous rock, and schist, overlain by surficial deposits of unconsolidated glacial till, of varying size, from boulders to very fine sediments (Jafarov et al, 2018; Léger et al, 2019; Sainsbury et al, 1970; Till et al, 1986, 2011). An organic rich soil layer of varying thickness (presumed to be from cm to m; Graham et al, 2018) covers much of the glacial till and supports a variety of vegetation, including tall shrubs, dwarf shrubs, mosses, and graminoids, in addition to lichens.…”

Section: Methodsmentioning

confidence: 99%

Chemostatic concentration–discharge behaviour observed in a headwater catchment underlain with discontinuous permafrost

Conroy

Dann

Newman

et al. 2022

Hydrological Processes

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Concentration-discharge dynamics were evaluated in a small ($ 2.25 km 2 ) headwater catchment underlain with discontinuous permafrost on the Seward Peninsula of western Alaska. A large storm, during which 48 mm of rain fell over a 24-h period, enabled the evaluation of solute concentration-discharge response to a sizeable hydrological event, while water stable isotopes enabled an appraisal of the contributions of event water. Under normal catchment conditions, chemostatic behaviour was observed for solutes typically derived from mineral weathering (e.g. calcium, magnesium, sodium and silica). The chemostatic behaviour observed for most solutes under normal catchment conditions indicated that catchment storage and residence times are sufficiently long for many solute generating reactions to approach equilibrium. Following the storm however, most solutes exhibited dilutive and highly variable behaviour. This likely indicated the exceedance of a discharge threshold where chemostatic behaviour could no longer be maintained for most solutes. Dissolved organic carbon and silica were the only solutes monitored to exhibit chemostatic behaviour during all time periods.

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“…Arrows point to the Bendeleben fault scarp. The star indicates the location of small Quaternary basalt flows in Lava Creek [ Till et al ., ].…”

Section: Geological and Tectonic Settingmentioning

confidence: 99%

Thermochronologic constraints on Late Cretaceous to Cenozoic exhumation of the Bendeleben Mountains, Seward Peninsula, Alaska

McDannell

Toro

Hourigan

et al. 2014

Geochem. Geophys. Geosyst.

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In the Bendeleben Mountains, Seward Peninsula, mid-Cretaceous granites are exposed in an uplifted block bounded on its south side by an E-W striking normal fault. The Bendeleben fault has wellpreserved scarps 4-7 m in height that offset Holocene moraines. Seismic activity, young normal faulting, and Quaternary basaltic volcanism are all evidence of active extension. South of the Bendeleben fault, there is a 3-4 km deep basin. Fifteen apatite (U-Th)/He ages from granitic samples of the footwall yield an Eocene weighted mean age of 41.364.8 Ma. Biotite 40 Ar/ 39 Ar ages from the country rock of the Bendeleben pluton are 81-83 Ma. In spite of the young fault scarps, HeFTy and Pecube thermal modeling results illustrate that rapid exhumation of the Bendeleben Mountains occurred in the Late Cretaceous-Eocene and slowed since the Oligocene. A weak age-elevation relationship of apatite He ages and a lack of correlation between age and distance from the fault indicate that exhumation was accomplished with minimal block rotation on a steeply dipping, long-lived normal fault. Timing of extension in the Seward Peninsula can be correlated with deformation in the offshore Hope Basin where seismic reflection lines document Early Tertiary largemagnitude normal faulting followed by minor post-Miocene reactivation. The faulting observed in the Bendeleben Mountains is part of an extensional system that spans a large portion of the Bering Strait region. The tectonic model proposed in previous studies suggests that clockwise rotation of the Bering block relative to North America is the cause of extensional deformation in western Alaska.

show abstract

Preliminary geologic map and fossil data, Solomon, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska

Cited by 39 publications

References 7 publications

Cretaceous mid-crustal metamorphism and exhumation of the Koolen gneiss dome, Chukotka Peninsula, northeastern Russia

Cretaceous mid-crustal metamorphism and exhumation of the Koolen gneiss dome, Chukotka Peninsula, northeastern Russia

Chemostatic concentration–discharge behaviour observed in a headwater catchment underlain with discontinuous permafrost

Thermochronologic constraints on Late Cretaceous to Cenozoic exhumation of the Bendeleben Mountains, Seward Peninsula, Alaska

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