Tectonic setting and U-Pb geochronology of the early Tertiary Ladybird leucogranite suite, Thor-Odin-Pinnacles area, southern Omineca belt, British Columbia

Article Abstract:

The Omineca belt Ladybird leucogranite suite in British Columbia is an intrusive pluton between overlying normal faults and underlying thrust faults. In shear zones, it occurs in synkinematic sheets, and as plutons, batholiths, and stocks elsewhere. U-Pb zircon dating was used to time transition from compression and extension. Heating of the middle crust during compression and crustal thickening and consequent anatexis due to decompression was postulated. The results suggest that extension caused uplift and exposure of the Ladybird suite, while compression led to granite-formation.

Usage, British Columbia, Granite, Geomorphological research, Uranium-lead dating

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Backarc thrust faulting and tectonic uplift along the Caribbean Sea coast during the April 22, 1991 Costa Rica earthquake

Article Abstract:

The earthquake that shook Panama and Costa Rica on Apr 22, 1991 was accompanied by alteration in the coastal landscape and tidal waves. The earthquake was tectonic in origin and was traced to the backarc thrusting of faults along the north Panama deformed belt. The uplift detected on a four kilometer stretch rose from zero to 157 centimeters and decreased over a 70 kilometer distance. Models for tectonic dislocation computed the original slip at 2.2 meters. The 1991 quake marks the latest in the continuing deformation process in the area as inferred from fossilized reef platforms.

Costa Rica, Panama

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The interpretation of inverted metamorphic isograds using simple physical calculations

Article Abstract:

Simple formulae that describe the relationships between the parametersof thrust faulting are derived. Inverted temperature gradients form during slipon major thrust faults under two conditions. The first one is that the slip is rapid. Second, dissipative heating associated with deformation maintain an inverted temperature gradient if the product of shear stress and slip speed is great enough.

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