Dave Pearson's Research

Research

TECTONIC AND STRUCTURAL EVOLUTION OF THE SOUTHERN CENTRAL ANDES, NW ARGENTINA


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View toward NW of doubly-plunging Tin-tin anticline, east of Cachi, Argentina. Explore the region of my PhD research in Google Earth.

Panoramic view of northern Calchaqui Valley and Cachi Range near La Poma, Argentina. Structural relief in the Cachi Range is primarily a result of fault-propagation folding. The visible contact at the range margin is often an overturned angular unconformity.

Isoclinal folding within Cambrian Puncoviscana Formation metaturbidites likely occurred during mid to Late Cambrian time.

Sigma clasts and S-C fabrics occur within ultramylonitic shear zones in Ordovician granitoids in the core of the Cachi Range. This shear zone records a normal sense of displacement and may reflect extensional collapse of an Ordovician orogen.

This minor fault propagation fold south of La Poma accommodated ~30 m of reverse-sense structural relief.

Overturned angular unconformity in an overturned footwall syncline at the eastern margin of the Cachi Range. This is a thick-skinned style of deformation and, coupled with (U-Th)/He-zircon results, demonstrates that fault-propagation folding (not slip across discrete faults) was the major mechanism for the formation of structural relief in the region.

Panoramic view of Miocene growth syncline near Quebrada del Toro, west of Salta, Argentina.


MS Research


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Mussel Inlet, western British Columbia, Canada


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