Geodynamic evolution of the Neogene intermontane Chota basin, Northern Andes of Ecuador

Quaternary tectonics in the central Interandean Valley, Ecuador: Fault-propagation folds, transfer faults and the Cotopaxi Volcano

“…The deposits involved include those belonging to the sedimentary basins of late Miocene-Holocene age (Winter and Lavenu, 1989;Lavenu et al, 1995;Baragan et al, 1996;Ego et al, 1996;Winkler et al, 2005) and the pyroclastics and lava flows outpoured by the Plio-Quaternary volcanoes that punctuate the IV.…”

“…1). The IV hosts a series of sedimentary basins of late Miocene-Holocene age (Winter and Lavenu, 1989;Lavenu et al, 1995;Baragan et al, 1996;Ego et al, 1996;Winkler et al, 2005) that are punctuated by a few main Quaternary stratovolcanoes, like Cotopaxi. The IV genesis was initially interpreted as due to extension in the framework of a simple graben structure (Baldock, 1982), but later compressional pulses have been recognised in the basin deposits (e.g.…”

Late Glacial and Holocene avulsions of the Rio Pastaza Megafan (Ecuador–Peru): frequency and controlling factors

“…The Western Cordillera and Interandean Depression are constituted by Upper Cretaceous-Paleogene formations, mainly andesitic (Reynaud et al 1999;Lavenu et al 1992;Kennerley 1980) unconformably overlain by neogene andesitic formations affected by late Miocene to early Pleistocene deformations (Lavenu et al 1992;Barragann et al 1996;Hungerbühler et al 2002;Winkler et al 2005) and Quaternary volcanic formations (Kennerley 1980;Barberi et al 1988;Lavenu et al 1992).…”

“…In the Interandean Depression, late Miocene to early Pleistocene syntectonic deposits have been recognized and dated by means of K-Ar and U-Th/He measurements at 8.5-7.9 to 1 Ma (Lavenu et al 1992;Kennerley 1980;Barberi et al 1988;Barragann et al 1996;Hungerbühler et al 2002;Winkler et al 2005).…”

The Chota basin and its significance for the inception and tectonic setting of the inter-Andean depression in Ecuador

“…Winter and Lavenu, 1989a,b;Egüez and Beate, 1992;Lavenu et al, 1995Lavenu et al, , 1996Baragán et al, 1996; and used chronostratigraphy, sedimentology, structural analysis, and seismicity to propose several different mechanisms for the formation of the IAD. Early works invoke a simple graben structure that formed during E-W-oriented extension (e.g.…”