Val Verde Basin: Difference between revisions
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== Depositional History and Stratigraphy == |
== Depositional History and Stratigraphy == |
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=== Late Triassic and Early Jurassic=== |
==== Late Triassic and Early Jurassic ==== |
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=== Middle and Upper Jurassic === |
==== Middle and Upper Jurassic ==== |
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=== Cretaceous === |
==== Cretaceous ==== |
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== Major Faults == |
== Major Faults == |
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=== Bruin bay Fault System === |
==== Bruin bay Fault System ==== |
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The Burin Bay fault system is system of steeply dipping, northeast-striking faults which extend roughly 498km along the western region of the basin. It extends from the south of Becharof Lake on the Alaskan Peninsula up to its termination point against the Castle-Mountain Lake fault system.<ref>Detterman, R.L., T. Hudson, G. Plafker, R.G. Tysdal, and J.M. Hoare, 1976, Reconnaissance geologic map along Bruin Bay and Lake Clark faults in Kenai and Tyonek Quadrangles, Alaska: USG Open-file Map 76-477, scale 1:250,000.</ref>. The system separates Mesosoic and Cenozoic volcanic sediments and Upper Triassic and Lower Jurassic volcanic rocks of the arc from Mesozoic marine and non-marine strata within the forearc basin <ref name= "test" />. Faults within the system are generally high angle and westward dipping, but due to the accumulation of sediments on the surface over time, the Burin Bay Fault system is present predominantly within the subsurface. The fault system was believed to have been active during Naknek deposition, and intrusive volcanic plutons indicate fault activity occurring before the Oligocene epoch <ref>Detterman, R.L., and B.L. Reed, 1980, Stratigraphy, structure, and economic geology of the Iliamna Quadrangle, Alaska: USGS Bulletin 1368-B, 86 p., scale 1:250,000, 1 plate.</ref>. |
The Burin Bay fault system is system of steeply dipping, northeast-striking faults which extend roughly 498km along the western region of the basin. It extends from the south of Becharof Lake on the Alaskan Peninsula up to its termination point against the Castle-Mountain Lake fault system.<ref>Detterman, R.L., T. Hudson, G. Plafker, R.G. Tysdal, and J.M. Hoare, 1976, Reconnaissance geologic map along Bruin Bay and Lake Clark faults in Kenai and Tyonek Quadrangles, Alaska: USG Open-file Map 76-477, scale 1:250,000.</ref>. The system separates Mesosoic and Cenozoic volcanic sediments and Upper Triassic and Lower Jurassic volcanic rocks of the arc from Mesozoic marine and non-marine strata within the forearc basin <ref name= "test" />. Faults within the system are generally high angle and westward dipping, but due to the accumulation of sediments on the surface over time, the Burin Bay Fault system is present predominantly within the subsurface. The fault system was believed to have been active during Naknek deposition, and intrusive volcanic plutons indicate fault activity occurring before the Oligocene epoch <ref>Detterman, R.L., and B.L. Reed, 1980, Stratigraphy, structure, and economic geology of the Iliamna Quadrangle, Alaska: USGS Bulletin 1368-B, 86 p., scale 1:250,000, 1 plate.</ref>. |
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=== Border Ranges Fault System === |
==== Border Ranges Fault System ==== |
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=== Castle Mountain Fault System === |
==== Castle Mountain Fault System ==== |
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=== References === |
==== References ==== |
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Revision as of 00:28, 19 April 2017
The Cook Inlet Basin (Northern Alaska)
The Cook Inlet Basin is a northeast-trending collisional forearc basin that stretches from the Gulf of Alaska into South central Alaska, just east of the Matanuska Valley. [1]. It is located in the arc-trench gap between the Alaska-Aleutian Range batholith. The western portion of the basin lies dierectly above the Aleutian subduction zone[1], while the eastern side of the basin overlays the subduction of the Yakutat microplate beneath the North American plate.
Tectonic Evolution
Depositional History and Stratigraphy
Late Triassic and Early Jurassic
Middle and Upper Jurassic
Cretaceous
Major Faults
Bruin bay Fault System
The Burin Bay fault system is system of steeply dipping, northeast-striking faults which extend roughly 498km along the western region of the basin. It extends from the south of Becharof Lake on the Alaskan Peninsula up to its termination point against the Castle-Mountain Lake fault system.[2]. The system separates Mesosoic and Cenozoic volcanic sediments and Upper Triassic and Lower Jurassic volcanic rocks of the arc from Mesozoic marine and non-marine strata within the forearc basin [1]. Faults within the system are generally high angle and westward dipping, but due to the accumulation of sediments on the surface over time, the Burin Bay Fault system is present predominantly within the subsurface. The fault system was believed to have been active during Naknek deposition, and intrusive volcanic plutons indicate fault activity occurring before the Oligocene epoch [3].
Border Ranges Fault System
Castle Mountain Fault System
References
- ^ a b http://archives.datapages.com/data/specpubs/memoir104/data/37_aapg-sp1940037.htm.
- ^ Detterman, R.L., T. Hudson, G. Plafker, R.G. Tysdal, and J.M. Hoare, 1976, Reconnaissance geologic map along Bruin Bay and Lake Clark faults in Kenai and Tyonek Quadrangles, Alaska: USG Open-file Map 76-477, scale 1:250,000.
- ^ Detterman, R.L., and B.L. Reed, 1980, Stratigraphy, structure, and economic geology of the Iliamna Quadrangle, Alaska: USGS Bulletin 1368-B, 86 p., scale 1:250,000, 1 plate.