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Geologic Re-Evaluation of AMOCO Becharof #1

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Geologic Re-Evaluation of AMOCO Becharof #1 Structural Linkage of Major Tectonic Elements Ugashik Lakes – Becharof Lake Region Northeastern Alaska Peninsula Author(s) and affiliations: Paul L. Decker1, Rocky R. Reifenstuhl2 , and Robert J. Gillis2 1 Alaska Division of Oil and Gas 2 Alaska Division of Geological & Geophysical Surveys Date presented: March 27, 2008 Presentation Forum: DNR Spring Technical Review Meeting, BP Energy Center Acknowledgments of any external funding sources and in-kind contributors: Field studies during 2007 were funded by the Alaska Division of Oil and Gas and the Alaska Division of Geological & Geophysical Surveys. The authors appreciate logistical assistance from Katmai National Park and the U.S. Fish and Wildlife Service management in King Salmon, Alaska. Robert Blodgett (consulting geologist) helped confirm the presence of Jurassic Shelikof Formation based on its molluscan fauna assemblage in hand specimens. The ideas presented here benefitted from written communications with Chris Nye, DGGS/Alaska Volcano Observatory, and Natalia Ruppert, Alaska Earthquake Information Center. Alaska Peninsula – North Aleutian Basin Surface Thermal Maturity (Molenaar, 1996) Alaska Peninsula Stratigraphic Column Key Map Units: . Miocene Bear Lake Fm . Upper Jurassic Naknek Fm . Middle Jurassic Shelikof Fm Tectonic Elements . Bruin Bay Fault • Regional up-to-west reverse separation • Probable sinistral component (Detterman) • North of the southern shore of Becharof Lake • Tertiary (as old as Late Jurassic?) movement . Ugashik Lakes Fault System * • Down-to-west relative throw – but which way do faults dip? • Miocene deposits to west • Closely associated with short-wavelength magnetic anomaly • South of southern shore of Becharof Lake . Ugashik Sub-basin * • Separated from main back-arc depocenter by Meshik volcanic center • Later subsidence than main back-arc (Neogene vs Paleogene) . Becharof Discontinuity * • Major magnetic contrast between subsided basin and uplifted BBF • Seismically-mappable fault zone • Modern seismicity, volcanism * new name, this study Ugashik – Becharof Lakes Area Geology Hangingwall block of BBF Gas Rocks Ukinrek Maars Peulik volcano QTc Ugashik Narrows Tbl Tbl 25 km 15 mi after Wilson and others, 1999 Ugashik Lakes Fault System 07PD151 . Jurassic to E . Miocene to W Ugashik Narrows 07PD154 07PD168 10km 07PD173 dike 6 mi 07PD161 Ugashik Sub-basin Distinct subsidence history Major Ugashik sub-basin subsidence during Miocene (Bear Lake Fm) Main depocenter subsidence during Eocene-Oligocene (Tolstoi, Stepovak Fms) Ugashik Sub-basin Seismic time structure Base Bear Lake Fm 10 km pld / Alaska Div of Oil & Gas 6 mi Ugashik – Becharof Region Aeromagnetics Becharof discontinuity Ugashik Lakes aeromag anomalies 25 km 15 mi Ugashik Lakes Magnetic Anomaly vs. Geology Qvi Qvi Positive anomaly Jurassic B Negative anomaly Miocene B’ Tm 15 km 10 mi High Magnetic-susceptibility Jurassic Units Naknek Fm conglomerates Shelikof Fm conglomerates rich in plutonic cobbles & boulders, rich in basaltic pebbles, east shore island in Upper Ugashik Lake of Upper Ugashik Lake seismic interpretation (fig. 5) B B A B’ 25 km 15 mi Ugashik Lakes Fault System Conceptual Magnetic-Structural Model B Ugashik Lakes B’ WNW fault system ESE Ugashik sub-basin Ugashik mountains, uplands (Quaternary cover) Narrows (abundant outcrop) largely negative, local positive anomalies pos neg positive Tbl Js Jn Tbl ? Ji? and other Tertiary or Js/Jn? sedimentary sub-basin fill Js and older sedimentary units B A Ji? ? Ji? basement ? ? ? 07PD151 Fault-fracture fabrics Naknek Fm Ugashik Lakes Fault System n = 41 07PD154 Bear Lake Fm Notable subpopulations with n = 55 NNE-SSW strike, steep NW dip 07PD168 Shelikof Fm Interpreted as parallel to n = 56 controlling faults of Ugashik Lakes Fault System 07PD161 Naknek Fm i.e., ULFS = NW-dipping faults n = 45 with normal offset 07PD173 Bear Lake Fm n = 66 Extensional fabric in Bear Lake Formation lignite Syndepositional fault rotation and local Penecontemporaneous microfaults and intraformational truncation in Bear Lake shear fractures in lacustrine(?) silts of Fm, east shore of Upper Ugashik Lake Bear Lake Fm, S of Lower Ugashik Lake Focal Mechanisms 1996-2006 Becharof Lake Ugashik Lakes Most events consistent with ~north-south maximum horizontal compressive stress component of sinistral strike slip s2 s3 (vert) Focal Mechanism map courtesy of s Natalia Ruppert, Alaska Earthquake 1 Information Center. Kinematic Linkage of Tectonic Elements Gas Rocks & Eo-Oligocene Meshik Ukinrek Maars extrusive complex Ugashik sub-basin (subsidence) Mt. Peulik volcano t s3 s2 (vert) s1.
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