Gondwanian age dextral transpression and spatial kinematic partitioning within the Heritage Range, Ellsworth Mountains, West Antarctica

Article Abstract:

A model of highly oblique, pure-shear dominated dextral transpression describes the structural and kinematic characteristics of the Heritage Range of the Ellsworth Mountains, West Antarctica. Transpressive deformation is associated with efficient spatial partitioning of the strike-slip component of shear. The Heritage Range comprises a lower Paleozoic volcanic and sedimentary rock sequence that experienced a single Early Mesozoic deformation event. Andean-style convergence along the southern margin of Gondwana before its breakup resulted in this Gondwanian orogeny.

Models, Geology, Structural, Structural geology, Gondwana (Geology), Gondwana

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The Gem Lake shear zone: Cretaceous dextral transpression in the Northern Ritter Range pendent, eastern Sierra Nevada, California

Article Abstract:

The middle Cretaceous Sierra Nevada was marked by distributed dextral transpressional deformation with many active shear zones. These zones are reflected in contemporary metamorphic pendents and older plutons bordering the Late Cretaceous batholith. The Gem Lake shear zone with its dextral shearing and subvertical stretching related to horizontal shortening have direct relation and result from dextral transpressional deformation. There is enough evidence supporting dextral strike-slip and/or contractional deformation claims.

Sierra Nevada (United States)

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Uplift and erosion of the San Bernardino Mountains associated with transpression along the San Andreas fault, California, as constrained by radiogenic helium thermochronometry

Article Abstract:

A study was conducted on the uplift and erosion of the San Bernardino Mountains (SBMs) in southern California. The low-temperature cooling history of the SBMs was analyzed using radiogenic helium thermochronometry. Results showed that the helium ages of the uplift predate the present uplift of the range and that exhumation was only several kilometers since the Late Cretaceous. These results suggest that the uplift and exhumation is associated with transpression along the San Andreas fault.

Erosion, Erosion (Geology), Strike-slip faults (Geology), Strike-slip faults, San Bernardino Mountains

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