Parallel thrust and normal faulting in Peru and constraints on the state of stress

Details Parallel thrust and normal faulting in Peru and constraints on the state of stress Parallel thrust and normal faulting in Peru and constraints on the state of stress

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..55..473d&link_type=abstract

Earth and Planetary Science Letters, Volume 55, Issue 3, p. 473-481.

Computer Science

126

Scientific paper

We present evidence for recent normal faulting in the Cordillera Blanca of Peru along planes trending approximately N40°W, parallel to the chain. This type of faulting suggests that there is an important component of extension perpendicular to the chain and contrasts markedly with the underthrusting of the Nazca plate on the west side of Peru and with the folding and thrusting observed in the Sub-Andes, on the eastern flank of the chain. These contrasting styles of deformation and associated stress fields can be explained by buoyancy forces due to the high mountains and crustal roots. In so far as this explanation is correct, the difference in elevation between zones of normal and thrust faulting can be used to place an upper bound of 500 bars on the average stress difference in the crust.

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