Hydrocarbon potential, geologic hazards, and infrastructure for exploration and development of the lower Cook Inlet, Alaska

Magoon, Leslie B.; Adkinson, W.L.; Chmelik, Frank B.; Dolton, G.L.; Fisher, Michael A.; Hampton, Monty A.; Sable, E.G.; Smith, R.A.

doi:10.3133/ofr76449

Cited by 9 publications

(8 citation statements)

References 43 publications

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“…Within these basins, the Cretaceous Matanuska and Kaguyak formations and other unnamed units record dom-inantly marine depositional systems with the majority of sediment input from the adjacent Jurassic-Cretaceous volcano-plutonic belts that represent arc magmatism ( Fig. 14A; Magoon et al, 1976a;Magoon et al, 1976b;Fisher and Magoon, 1978;Detterman and Miller, 1985;Magoon and Egbert, 1986;Trop, 2008). During this time period, the southern Alaska forearc basin system was similar to the models based on the Great Valley sequence (Dickinson and Seely, 1979;Dickinson, 1995;DeGraaff-Surpless et al, 2002) with the bulk of the sediment derived from an adjacent coeval magmatic arc system and deposition in marine settings (Trop, 2008).…”

Section: Late Cretaceous Forearc Systemmentioning

confidence: 99%

“…Provenance data from Late Cretaceous strata on the arc margin of the basin indicate dominantly local arc sources prior to ridge subduction, whereas data from middle Eocene strata on the arc margin that postdate ridge subduction suggest sediment sources located north of the present-day Alaska Range inboard of the mostly dormant Late Cretaceous to Paleocene volcanic arc (Figs.14A and 14B; Magoon et al, 1976aMagoon et al, , 1976bFisher and Magoon, 1978;Detterman and Miller, 1985;Magoon and Egbert, 1986). We infer that after passage of the spreading ridge, widespread subsidence of the upper plate occurred due to crustal thinning that resulted from a combination of physical and thermal thinning of the lithosphere (e.g., Cole and Stewart, 2009) as well as denudation of the Late Cretaceous to Paleocene arc associated with isostatic uplift of the upper plate.…”

Section: Paleocene-eocene Spreading-ridge Subductionmentioning

confidence: 99%

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Provenance signature of changing plate boundary conditions along a convergent margin: Detrital record of spreading-ridge and flat-slab subduction processes, Cenozoic forearc basins, Alaska

2015

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Cenozoic strata from forearc basins in southern Alaska record deposition related to two different types of shallow subduction: Paleocene-Eocene spreading-ridge subduction and Oligocene-Recent oceanic plateau subduction. We use detrital zircon geochronology (n = 1368) and clast composition of conglomerate (n = 1068) to reconstruct the upper plate response to these two subduction events as recorded in forearc basin strata and modern river sediment. Following spreading-ridge subduction, the presence of Precambrian and Paleozoic detrital zircon ages in middle Eocene-lower Miocene arc-margin strata and Early Cretaceous ages in lower Miocene accretionary prism-margin strata indicates that sediment was transported to the basin from older terranes in interior Alaska and from the exhumed eastern part of the Cretaceous forearc system, respectively. By middle-late Miocene time, diminished abundances of these populations reflect shallow subduction of an oceanic plateau and associated exhumation that resulted in an overall contraction of the catchment area for the forearc depositional system.In the southern Alaska forearc basin system, upper plate processes associated with subduction of a spreading ridge resulted in an abrupt increase in the diversity of detrital zircon ages that reflect new sediment sources from far inboard regions. The detrital zircon signatures from strata deposited during oceanic plateau subduction record exhumation of the region above the flat slab, with the youngest detrital zircon population reflecting the last period of major arc activity prior to inser-tion of the flat slab. This study provides a foundation for new tectonic and provenance models of forearc basins that have been modified by shallow subduction processes, and may help to facilitate the use of U-Pb dating of detrital zircons to better understand basins that formed under changing geodynamic plate boundary conditions. ., 2015, Provenance signature of changing plate boundary conditions along a convergent margin: Detrital record of spreading-ridge and flat-slab subduction processes, Cenozoic forearc basins, Alaska: Geosphere, v. 11, no. 3,

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Section: Late Cretaceous Forearc Systemmentioning

confidence: 99%

Section: Paleocene-eocene Spreading-ridge Subductionmentioning

confidence: 99%

Provenance signature of changing plate boundary conditions along a convergent margin: Detrital record of spreading-ridge and flat-slab subduction processes, Cenozoic forearc basins, Alaska

2015

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“…The sample symbols denote both the source of the data (by shape) and the depositional age (by color). (Magoon et al, 1976). In the center of the basin, the forearc strata unconformably overlie Mesozoic sedimentary and volcanic rocks (Jones and Silberling, 1979;Magoon and Egbert, 1986).…”

Section: Existing Provenance and Tectonic Modelsmentioning

confidence: 99%

Partitioning Pervasive Detrital Geochronologic Age Distributions in the Southern Alaskan Forearc

Finzel

2019

Front. Earth Sci.

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“…The Kenai mountains, Castle mountain, and the Bruin Bay fault zones are the major boundary features (Boss et al, 1975). The Outer Continent Shelf area lies between these faults and contains anticlinal structures and faults that may be potential traps for hydrocarbons (Magoon, 1976). Dickinson (1971) described the basin as a trench-arc gap type: a Cenozoic residual forearc basin in a convergent continental margin along the northwest Pacific Rim.…”

Section: Hydrocarbon Productionmentioning

confidence: 99%

Basin-centered gas systems of the U.S.

Popov¹,

Nuccio²,

Dyman³

et al. 2001

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Hydrocarbon potential, geologic hazards, and infrastructure for exploration and development of the lower Cook Inlet, Alaska

Cited by 9 publications

References 43 publications

Provenance signature of changing plate boundary conditions along a convergent margin: Detrital record of spreading-ridge and flat-slab subduction processes, Cenozoic forearc basins, Alaska

Provenance signature of changing plate boundary conditions along a convergent margin: Detrital record of spreading-ridge and flat-slab subduction processes, Cenozoic forearc basins, Alaska

Partitioning Pervasive Detrital Geochronologic Age Distributions in the Southern Alaskan Forearc

Basin-centered gas systems of the U.S.

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