publication . Article . Other literature type . 2008

The Chimborazo sector collapse and debris avalanche: Deposit characteristics as evidence of emplacement mechanisms

Bernard, Benjamin; Van Wyk De Vries, Benjamin; Barba, Diego; Leyrit, Hervé; Robin, Claude; Alcaraz, Samantha; Samaniego, Pablo;
Open Access English
  • Published: 01 Jan 2008
  • Publisher: HAL CCSD
Abstract
Abstract Chimborazo is a Late Pleistocene to Holocene stratovolcano located at the southwest end of the main Ecuadorian volcanic arc. It experienced a large sector collapse and debris avalanche (DA) of the initial edifice (CH-I). This left a 4 km wide scar, removing 8.0 ± 0.5 km 3 of the edifice. The debris avalanche deposit (DAD) is abundantly exposed throughout the Riobamba Basin to the Rio Chambo, more than 35 km southeast of the volcano. The DAD averages a thickness of 40 m, covers about 280 km 2 , and has a volume of > 11 km 3 . Two main DAD facies are recognized: block and mixed facies. The block facies is derived predominantly from edifice lava and forms ...
Subjects
free text keywords: Chimborazo, debris avalanche deposit, block facies, mixed facies, structures, emplacement, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology, Geochemistry and Petrology, Geophysics, Debris, Volcanic arc, geography.geographical_feature_category, geography, Geomorphology, Geochemistry, Stratovolcano, Quaternary, Facies, Geology, Volcano, Shear zone, Lava
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publication . Article . Other literature type . 2008

The Chimborazo sector collapse and debris avalanche: Deposit characteristics as evidence of emplacement mechanisms

Bernard, Benjamin; Van Wyk De Vries, Benjamin; Barba, Diego; Leyrit, Hervé; Robin, Claude; Alcaraz, Samantha; Samaniego, Pablo;