Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Life and death of a Cambrian-Ordovician basin; an Andean three-act play featuring Gondwana and the Arequipa-Antofalla Terrane

Sven O. Egenhoff
Life and death of a Cambrian-Ordovician basin; an Andean three-act play featuring Gondwana and the Arequipa-Antofalla Terrane (in The evolution of the Rheic Ocean; from Avalonian-Cadomian active margin to Alleghenian-Variscan collision, Ulf Linnemann (editor), R. Damian Nance (editor), Petr Kraft (editor) and Gernold Zulauf (editor))
Special Paper - Geological Society of America (2007) 423: 511-524

Abstract

Reconstruction of the facies architecture and geometries of the Cambrian-Ordovician succession in the Central Andes of southern Bolivia and northwestern Argentina reveals a tripartite basin history that closely corresponds to interpretations of regional plate tectonic movements. The analysis of basin deposits enabled tracing and timing of movements of the Arequipa-Antofalla terrane, which initiated, fed, and terminated a basin between the terrane and Gondwana during the early Paleozoic. Tectonic movements started in the Cambrian and led to the formation of an extensional basin. Stretching was more pronounced in southern Bolivia than in northwestern Argentina, resulting in widening of the basin to the north. This was produced by a counterclockwise rotation of the Arequipa-Antofalla terrane relative to Gondwana, with a Euler pole in northwest Argentina. Tectonic movements reversed in the late Early Ordovician (Expansograptus holmi biozone), with the terrane rotating clockwise back against Gondwana. Consequently, the extensional basin turned into a foreland trough, with its western part undergoing high subsidence. A forebulge developed on the eastern shelf, which triggered westward progradation of a delta, thereby significantly reducing basin width. Although compressional movements advanced from west to east, reliable bio-stratigraphic calibration was established only for facies on the distal part of the overridden plate as graptolite ecology and abundance in this area enhanced biostratigraphic resolution. In the Late Ordovician, the basin closed in northwestern Argentina but continued to accumulate coarse-grained, partially glacigenic debris in southern Bolivia.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 423
Title: Life and death of a Cambrian-Ordovician basin; an Andean three-act play featuring Gondwana and the Arequipa-Antofalla Terrane
Title: The evolution of the Rheic Ocean; from Avalonian-Cadomian active margin to Alleghenian-Variscan collision
Author(s): Egenhoff, Sven O.
Author(s): Linnemann, Ulfeditor
Author(s): Nance, R. Damianeditor
Author(s): Kraft, Petreditor
Author(s): Zulauf, Gernoldeditor
Affiliation: Colorado State University, Department of Geosciences, Fort Collins, CO, United States
Affiliation: Staatliche Naturhistorische Sammlungen Dresden, Museum fuer Mineralogie und Geologie, Dresden, Federal Republic of Germany
Pages: 511-524
Published: 2007
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 46
Accession Number: 2008-044795
Categories: Structural geologyStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. chart, strat. col., 1 table, geol. sketch map
S22°30'00" - S19°30'00", W66°15'00" - W65°00'00"
Secondary Affiliation: Ohio University, USA, United StatesCharles University Prague, CZE, Czech RepublicUniversitaet Frankfurt am Main, DEU, Federal Republic of Germany
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200813
Close Modal

or Create an Account

Close Modal
Close Modal