Reconstruction of Jurassic paleogeography of part of southwestern North America: Some relevant factors

Conference · Thu Apr 01 00:00:00 EST 1993 · Geological Society of America, Abstracts with Programs; (United States)

OSTI ID:5437494

Anderson, T H; Kohn, M ^[1]

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1. Univ. of Pittsburgh, PA (United States). Dept. of Geology and Planetary Science

A tectonic restoration has been initiated with the objective of reconstructing the paleogeography of the middle Jurassic volcanic and plutonic belt in part of southwestern North America west and southwest of the Colorado Plateau. Consideration of displacements of stratigraphic or tectonostratigraphic elements related to a structure or a system of structures include: (1) strike-slip translation along faults of the San Andreas system, especially those affecting rocks of the western Mojave desert region; (2) tertiary extensions west of the perimeter of the Colorado Plateau; (3) cretaceous contraction recorded by supracrustal rocks; (4) cretaceous lateral displacement, specifically as recorded by the Mojave-Snowy Lake fault; and (5) Late Jurassic lateral displacement along the Mojave-Sonora megashear. Cretaceous and Jurassic magmatic rocks are assumed to have formed about zones of subduction near the margins of converging plates. These rocks generally form crudely linear bands which may be used to monitor regional translations. Other linear elements useful in recording regional strain are facies lines and terrane boundaries, especially those related to steep lateral faults.

• OSTI ID: 5437494
• Report Number(s): CONF-9305259-; CODEN: GAAPBC
• Journal Information: Geological Society of America, Abstracts with Programs; (United States), Vol. 25:5; Conference: 89. annual meeting of the Cordilleran Section and the 46th annual meeting of the Rocky Mountain Section of the Geological Society of America (GSA), Reno, NV (United States), 19-21 May 1993; ISSN 0016-7592
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
GREAT BASIN
GEOLOGIC HISTORY
PLATE TECTONICS
STRATIGRAPHY
GEOLOGIC MODELS
ARIZONA
CALIFORNIA
DEPOSITION
GEOLOGIC DEPOSITS
GEOLOGIC FAULTS
IGNEOUS ROCKS
JURASSIC PERIOD
MAGMATISM
NEVADA
SUBDUCTION ZONES
UTAH
DEVELOPED COUNTRIES
GEOLOGIC AGES
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
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MESOZOIC ERA
NORTH AMERICA
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580000* - Geosciences