Structural relationships and lithologic deformation partitioning of the Sevier, Laramide, Mid-Tertiary and Basin and Range deformations in the High Plateaus of southwestern Utah

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

OSTI ID:5505548

Nickelsen, R P ^[1]

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1. Bucknell Univ., Lewisburg, PA (United States). Geology Dept.

A Mid-Tertiary horizontal compression, verging radially toward Az 120 to 215 and extending E-W for 90 km across the High Plateaus of SW Utah, was driven by intrusions and/or gravitational spreading of the Marysvale volcanic field, 40-60 km to the north. Structures of this deformation overprint a NNW trending Laramide monocline on the east, and are overprinted by NNE trending Basin and Range extensional structures. To the west at the Sevier deformation front, Mid-Tertiary compressional structures are directed Az 205, but no Sevier foreland deformation was found. Small scale structures of the Laramide, Mid-Tertiary, and Basin and Range deformations are partitioned lithologically in four rock types of different properties: (1) Friable Cretaceous sands contain Laramide and Mid-Tertiary conjugate compressional sand shear wedges or Laramide and Basin and Range conjugate, extensional sand shears; (2) Calcareous Cretaceous sandstones or Eocene Claron Fm limestones contain both conjugate compressional wedge faults and strike-slip faults; (3) spaced dissolution cleavage occurs only in Claron limestones; (4) cretaceous coals contain Mid-Tertiary joints (cleat) at distal locations. A Mid-Tertiary layer-parallel strain gradient toward the SE-S-SSW is marked by deformation fronts in the four rock types where conjugate faults, spaced cleavage, sand shears and joints in coal successively disappear.

• OSTI ID: 5505548
• Report Number(s): CONF-9303211-; CODEN: GAAPBC
• Journal Information: Geological Society of America, Abstracts with Programs; (United States), Vol. 25:2; Conference: 28. annual Geological Society of America (GSA) Northeastern Section meeting, Burlington, VT (United States), 22-24 Mar 1993; ISSN 0016-7592
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
GEOLOGIC FORMATIONS
GEOLOGY
TECTONICS
GEOLOGIC STRUCTURES
UTAH
COAL
DEFORMATION
GEOLOGIC FAULTS
LIMESTONE
LITHOLOGY
ORIENTATION
SANDSTONES
STRESS ANALYSIS
TERTIARY PERIOD
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CENOZOIC ERA
DEVELOPED COUNTRIES
ENERGY SOURCES
FOSSIL FUELS
FUELS
GEOLOGIC AGES
GEOLOGIC FRACTURES
MATERIALS
NORTH AMERICA
PETROLOGY
ROCKS
SEDIMENTARY ROCKS
USA
580000* - Geosciences