Origin of the high plateau in the Central Andes, Bolivia, South America

Article Abstract:

The origin of the high plateau in the Central Andes in South America was studied to determine the origin of the high plateaus in mountain belts. The study described the Cenozoic geological evolution of the region by utilizing a revised chronostratigraphy and analyzing the crustal and lithospheric structure. Results present geomorphological and geochronological evidence for the surface uplift. The present relief in the Altiplano is a consequence of ductile flow in the lower crust, sedimentation and erosion in an internal drainage basin.

Cenozoic Era, Altiplano, Plateaus

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Geological evidence against large-scale pre-Holocene offsets along the Karakoram Fault: implications for the limited extrusion of the Tibetan plateau

Article Abstract:

Geological evidence is lacking for large-scale pre-Holocene offsets in the Karakoram Fault, Central Asia, indicating that the fault is due to Pliocene-Quaternary indentation of the Pamir. The geological offsets along the right-lateral fault are less than 120 km, though the fault is still active. The Karakoram Fault appears to have no relation to the extrusion of Tibetan crust subsequent to the Indian collision. The fault has affected the surface topographic uplift, cutting across the peaks of Karakoram to a small extent.

Faults (Geology), Karakoram Range

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Slow apparent polar wander for North America in the late Triassic and large Colorado plateau rotation

Article Abstract:

The fast Triassic apparent polar wander(APW) of North America and a modest amount of Colorado Plateau clockwise rotation shows that North America was part of the supercontinent of Pangea. Moreover, the virtual absence of APW for North America over 15 million years ofthe Norian was preceded and followed by intervals of fast angular plate velocity. Therefore, Pangea was stationary with respect to the paleomagnetic reference frame during this time.

Analysis, North America, Continental drift, Pangea (Geology), Pangaea, Triassic period

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