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A Major Unconformity Between Permian and Triassic Strata at Cape Kekurnoi, Alaska Peninsula

 
theresident
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05/18/2008 02:37 AM
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A Major Unconformity Between Permian and Triassic Strata at Cape Kekurnoi, Alaska Peninsula
A major angular unconformity separates carbonates and shales of the Upper Triassic Kamishak Formation from an underlying unnamed sequence of Permian agglomerate, volcaniclastic rocks (sandstone), and limestone near Puale Bay on the Alaska Peninsula.

For the first time, we photographically document the angular unconformity in outcrop, as clearly exposed in a seacliff ~1.3 mi (2.1 km) west of Cape Kekurnoi in the Karluk C–4 and C–5 1:63,360-scale quadrangles.

This unconformity is also documented by examination of core chips, ditch cuttings, and (or) open-hole electrical logs in two deep oil-and-gas-exploration wells (Humble Oil & Refining Co.’s Bear Creek No. 1 and Standard Oil Co. of California’s Grammer No. 1) drilled along the Alaska Peninsula southwest of Puale Bay.

A third well (Richfield Oil Corp.’s Wide Bay Unit No. 1), south of and structurally on trend with the other two wells, probed deeply into the Paleozoic basement, but Triassic strata are absent, owing to either a major unconformity or a large fault.

Here we briefly review current and newly acquired data on Permian and Triassic rocks of the Puale Bay-Becharof Lake-Wide Bay area on the basis of an examination of surface and subsurface materials.

The resulting reinterpretation of the Permian and Triassic stratigraphy has important economic ramifications for oil and gas exploration on the Alaska Peninsula and in the Cook Inlet basin. We also present a history of petroleum exploration targeting Upper Triassic reservoirs in the region.

Download this report as a 13-page PDF file (pp1739e.pdf; 2.2 MB)

[link to pubs.usgs.gov]
Redheaded Stepchild

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05/18/2008 02:41 AM
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Re: A Major Unconformity Between Permian and Triassic Strata at Cape Kekurnoi, Alaska Peninsula
Where's the BABELFISH for this? Ack!
"Until you are willing to organize your friends and neighbors and literally shut down cities - drive at 5mph through the streets of major cities on the freeway and stop commerce, refuse to show up for work, refuse to borrow and spend more than you make, show up in Washington DC with a million of your neighbors and literally shut down The Capitol you WILL be bent over the table on a daily basis." Karl Denninger

Don't blame me; I voted for Ron Paul.


Silence is consent.
Duncan Kunz

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05/18/2008 02:47 AM
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Re: A Major Unconformity Between Permian and Triassic Strata at Cape Kekurnoi, Alaska Peninsula
A major angular unconformity separates carbonates and shales of the Upper Triassic Kamishak Formation from an underlying unnamed sequence of Permian agglomerate, volcaniclastic rocks (sandstone), and limestone near Puale Bay on the Alaska Peninsula.

For the first time, we photographically document the angular unconformity in outcrop, as clearly exposed in a seacliff ~1.3 mi (2.1 km) west of Cape Kekurnoi in the Karluk C–4 and C–5 1:63,360-scale quadrangles.

This unconformity is also documented by examination of core chips, ditch cuttings, and (or) open-hole electrical logs in two deep oil-and-gas-exploration wells (Humble Oil & Refining Co.’s Bear Creek No. 1 and Standard Oil Co. of California’s Grammer No. 1) drilled along the Alaska Peninsula southwest of Puale Bay.

A third well (Richfield Oil Corp.’s Wide Bay Unit No. 1), south of and structurally on trend with the other two wells, probed deeply into the Paleozoic basement, but Triassic strata are absent, owing to either a major unconformity or a large fault.

Here we briefly review current and newly acquired data on Permian and Triassic rocks of the Puale Bay-Becharof Lake-Wide Bay area on the basis of an examination of surface and subsurface materials.

The resulting reinterpretation of the Permian and Triassic stratigraphy has important economic ramifications for oil and gas exploration on the Alaska Peninsula and in the Cook Inlet basin. We also present a history of petroleum exploration targeting Upper Triassic reservoirs in the region.

Download this report as a 13-page PDF file (pp1739e.pdf; 2.2 MB)
 Quoting: theresident


Not surprising if you think about it.

Lots of geologists and paleontologists believe that the Permian/Triassic die-off was caused by a meteor or comet strike similar to the better-known (although perhaps smaller) Chicxulub Strike in what is now Yucatan which caused its own die-off.

And as far as "unconformities" we have the K-T iridium layer and, of course, all the shocked limestone as a result of the Chicxulub Strike.

We are fortunate enough to have a real geologist poster; I wonder what her take is on this?
Where's the EVIDENCE, Jim?
Anonymous Coward
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05/18/2008 02:49 AM
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Re: A Major Unconformity Between Permian and Triassic Strata at Cape Kekurnoi, Alaska Peninsula
The Gulf of Alaska shelf is dominated by the Alaska Coastal current (ACC), which is forced by along-shore winds and large freshwater runoff. Strong cyclonic winds dominate from fall through spring, and substantial runoff occurs from late spring through fall with annual distributed freshwater discharge greater than that of the Mississippi River. We examine the ACC from Icy Bay to Unimak Pass, a distance of over 1500 km. Over this distance, the ACC is a nearly continuous feature with a marked freshwater core. The annual mean transport, as measured from current meters, is approximately 1.0×106 m3 s−1 along the Kenai Peninsula, with transport decreasing as the ACC travels westward. Even though the coastal GOA is a predominately downwelling system, it supports a productive ecosystem. Macro nutrients from the basin are provided to the coastal system through a number of processes including topographic steering, eddies, upwelling in response to horizontal shear in the barrier jets, and during winter the on-shelf flux in the surface Ekman layer. Micronutrients (e.g., iron) are supplied from mechanisms such as resuspension of shelf sediments and river discharge. While strong seasonal cycles and interannual variability are dominant scales in atmospheric forcing and the oceanic response, there is also forcing on ENSO and decadal time scales.



neener
theresident  (OP)

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05/18/2008 02:50 AM
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Re: A Major Unconformity Between Permian and Triassic Strata at Cape Kekurnoi, Alaska Peninsula
Geogal?
Duncan Kunz

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05/18/2008 02:51 AM
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Re: A Major Unconformity Between Permian and Triassic Strata at Cape Kekurnoi, Alaska Peninsula
The Gulf of Alaska shelf is dominated by the Alaska Coastal current (ACC),
<snip>
 Quoting: Anonymous Coward 310543

What does that have to do with geology?
Where's the EVIDENCE, Jim?
Duncan Kunz

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05/18/2008 02:52 AM
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Re: A Major Unconformity Between Permian and Triassic Strata at Cape Kekurnoi, Alaska Peninsula
Geogal?
 Quoting: theresident

Yes. She is a graduate geological engineer. I just do geology for a hobby.
Where's the EVIDENCE, Jim?
theresident  (OP)

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05/18/2008 02:54 AM
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Re: A Major Unconformity Between Permian and Triassic Strata at Cape Kekurnoi, Alaska Peninsula
Geogal?

Yes. She is a graduate geological engineer. I just do geology for a hobby.
 Quoting: Duncan Kunz


Likewise.
Anonymous Coward
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05/18/2008 03:02 AM
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Re: A Major Unconformity Between Permian and Triassic Strata at Cape Kekurnoi, Alaska Peninsula
The Gulf of Alaska shelf is dominated by the Alaska Coastal current (ACC),
<snip>

What does that have to do with geology?
 Quoting: Duncan Kunz


Nada... but it sounded nice :)





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