Basement composition and basin geometry controls on upper-crustal deformation in the Southern Central Andes (30–36°S)
2016
Deformation and uplift in the Andes are a result of the subduction of the Nazca plate
below South America. The deformation shows variations in structural style and shortening
along and across the strike of the orogen, as a result of the dynamics of the subduction
system and the features of the upper plate. In this work, we analyse the development of
thin-skinned and thick-skinned fold and thrust belts in the Southern Central Andes
(30–36°S). The pre-Andean history of the area determined the formation of different
basement domains with distinct lithological compositions, as a result of terrane
accretions during Palaeozoic time, the development of a widespread Permo-Triassic magmatic
province and long-lasting arc activity. Basin development during Palaeozoic and Mesozoic
times produced thick sedimentary successions in different parts of the study area. Based
on estimations of strength for the different basement and sedimentary rocks, calculated
using geophysical estimates of rock physical properties, we propose that the contrast in
strength between basement and cover is the main control on structural style (thin- v.
thick-skinned) and across-strike localization of shortening in the study area.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
92
References
11
Citations
NaN
KQI