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GEOREF RECORD

Seismic reflection evidence for two-phase development of Tertiary basins from east-central Nevada

Lee M. Liberty, Paul L. Heller and Scott B. Smithson
Seismic reflection evidence for two-phase development of Tertiary basins from east-central Nevada
Geological Society of America Bulletin (December 1994) 106 (12): 1621-1633

Abstract

Two east-west seismic reflection profiles crossing Antelope Valley, Smokey Valley, Railroad Valley, and Big Sand Springs Valley in east-central Nevada demonstrate the evolution of Tertiary basin extension in the Basin and Range Province from broad sags to narrow, fault-bounded basins. Reprocessing of a 480 channel, 60 fold, dynamite-source experiment enabled good imaging of basin stratigraphy. These data suggest two distinct phases of basin development occurred, separated by a regional unconformity. The early phase is characterized by development of a broad symmetric basin riddled with many small offset normal faults. The later phase shows a narrowing of the basin and subsidence along one dominant structure, an apparent planar normal fault. The unconformity separating the two phases of extension marks a transition from broad subsidence to local asymmetric tilting that took place over a short period of time relative to sedimentation rates. Antelope Valley, Smokey Valley, and Railroad Valley clearly show evidence for two-phase development. Big Sand Springs Valley represents only the later phase of extension. The absence of dating of stratigraphic units within the basins precludes us from determining if the abrupt tectonic transition within the basins resulted from differences in local strain rates or amounts, or was due to changes in regional stress fields.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 106
Serial Issue: 12
Title: Seismic reflection evidence for two-phase development of Tertiary basins from east-central Nevada
Affiliation: University of Wyoming, Department of Geology and Geophysics, Laramie, WY, United States
Pages: 1621-1633
Published: 199412
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Accession Number: 1994-050968
Categories: Structural geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N29°00'00" - N43°30'00", W122°00'00" - W102°30'00"
N36°00'00" - N39°07'60", W118°15'00" - W115°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 199424
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