Tectonic Evolution of the Andes of Northern Argentina

1995 ◽  
Keyword(s):  
Tectonic Evolution ◽  
The Andes

scholarly journals Ancient genetic divergence in bumblebee catfish of the genus Pseudopimelodus (Pseudopimelodidae: Siluriformes) from northwestern South America

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e9028
Author(s):  
José D. Rangel-Medrano ◽  
Armando Ortega-Lara ◽  
Edna J. Márquez
Keyword(s):  
South America ◽  
Genetic Divergence ◽  
Tectonic Evolution ◽  
Valid Species ◽  
Species Discovery ◽  
The Andes ◽  
First Time ◽  
Evolutionary Lineages ◽  
Insight Into ◽  
Molecular Clock Dating

Pseudopimelodus is a Neotropical genus of bumblebee catfish, composed of four valid species occurring in both trans- and cis-Andean rivers of South America. The orogeny of the Andes has led to diversification in the genus Pseudopimelodus in Colombia. This study analyzed partial sequences of mitochondrial cox1 and nuclear rag2 genes to test the hypothesis that the species, nominally recognized as P. schultzi and P. bufonius in Colombia, correspond to more than two different evolutionary lineages. Results indicate high levels of genetic divergence among individuals of nominal P. schultzi and P. bufonius, from trans- and cis-Andean basins in Colombia. In addition, five divergent lineages of Pseudopimelodus were confidently delimited by using a single-locus species-discovery approach and confirmed by species tree analyses. Additionally, molecular-clock dating showed that most diversification processes in Pseudopimelodus took place during the Miocene, when Andean tectonic evolution was occurring in northwestern South America. The present study provides, for the first time, phylogeographic insight into this Neotropical genus.

Chaines andines et chaines alpines; regard sur la geologie de la Cordillere des Andes au parallele de l'Argentine moyenne

1966 ◽  
Vol S7-VIII (7) ◽  
pp. 1050-1070 ◽  
Author(s):  
Jean Aubouin ◽  
Angel V. Borrello
Keyword(s):  
Tectonic Evolution ◽  
Quaternary Period ◽  
Alpine Orogeny ◽  
Mountain Ranges ◽  
Terrigenous Sediments ◽  
The Andes ◽  
Reverse Faulting ◽  
Thrust Sheets

Abstract The tectonic evolution of the Andes was generally contemporaneous with the Alpine orogeny (Mesozoic-Tertiary). Pre-Andean tectonic cycles (Hercynian) involved Infracambrian and Paleozoic sediments. Comparison of the Andean cycle with the Alpine cycle shows a similar evolution in three major periods: a Mesozoic period characterized by strong compressional movements during which the thick sediments of the Chilean slopes were thrust over the relatively thin sediments of the Argentine slopes; an Eocene-Oligocene-Miocene period characterized by the deformation of terrigenous formations as a result of andesitic volcanism and reverse faulting; and a Plio-Quaternary period marked by basalt flows and the accumulation of thick terrigenous sediments in faulted, deformed basins. The absence of flysch deposits, ophiolites, major thrust sheets, and widespread metamorphism in the Andes, however, distinguishes them from the Alpine ranges. Thus, two main types of pericratonic mountain ranges (as opposed to intracratonic ranges) should be differentiated: precursory (or Andean) ranges developed on the periphery of continents but within their margins and geosynclinal (or Alpine) ranges part of which are extracratonic.

Narrative of a Journey from Lima to Para, Across the Andes and Down the Amazon

2009 ◽  
Author(s):  
William Smyth ◽  
Frederick Lowe
Keyword(s):  
The Andes

Bilaterality in the Andes

1977 ◽  
Author(s):  
Bernd Lambert
Keyword(s):  
The Andes
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