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Miocene forebulge development previous to broken foreland partitioning in the southern Central Andes, west‐central Argentina
Author(s) -
Dávila Federico M.,
Astini Ricardo A.,
Jordan Teresa E.,
Gehrels George,
Ezpeleta Miguel
Publication year - 2007
Publication title -
tectonics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.465
H-Index - 134
eISSN - 1944-9194
pISSN - 0278-7407
DOI - 10.1029/2007tc002118
Subject(s) - foreland basin , geology , paleontology , subsidence , aggradation , tectonics , tectonic subsidence , geomorphology , structural basin , fluvial
In the distal region of the modern flat‐slab segment in the southern Central Andes, an unusual stack of middle Miocene paleosols together with regional upwarping and normal faulting indicate episodic aggradation and condensed sedimentation contemporaneous with the principal stage of foreland basin development associated with foreland flexure farther to the west. These features are consistent with development of a forebulge zone during the early stages of a proposed asymmetric foreland basin system. Sedimentary thickness farther east and far from the Cordilleran tectonic loads suggests accommodation and preservation driven by “nonisostatic” dynamic subsidence. Regional overlapping relationships and basin modeling suggest that the Modern broken foreland (present Sierras Pampeanas) can be interpreted as a reactivation of a formerly partitioned broad forebulge.