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Title: North America as an exotic terrane'' and the origin of the Appalachian--Andean Mountain system

Abstract

North America was sutured to Gondwana in the terminal Alleghanian event of Appalachian orogenesis, thus completing the late Paleozoic assembly of Pangea. The suggestion that the Pacific margins of East Antarctica-Australia and Laurentia may have been juxtaposed during the Neoproterozoic prompts reevaluation of the widely held assumptions that the ancestral Appalachian margin rifted from northwestern Africa during the earliest Paleozoic opening of Iapetus, and remained juxtaposed to that margin, even though widely separated from it at times, until the assembly of Pangea. The lower Paleozoic carbonate platform of northwestern Argentina has been known for a long time to contain Olenellid trilobites of the Pacific or Columbian realm. Although normally regarded as some kind of far-travelled terrane that originated along the Appalachian margin of Laurentia, it has recently been interpreted as a fragment detached from the Ouachita embayment of Laurentia following Taconic-Famatinian collision with Gondwana during the Ordovician. The Oaxaca terrane of Mexico, on the other hand, contains a Tremadocian trilobite fauna of Argentine-Bolivian affinities, and appears to have been detached from Gondwana following the same collision. The Wilson cycle'' of Iapetus ocean basin opening and closing along the Appalachian and Andean orogens may have involved more than one such continentalmore » collision during clockwise drift of Laurentia around South America following late Neoproterozoic to earliest Cambrian separation. Together with the collisions of baltic and smaller terranes with Laurentia, this could explain the protracted Paleozoic orogenic history of both the Appalachian and proto-Andean orogens.« less

Authors:
;  [1];  [2]
  1. Univ. of Texas, Austin, TX (United States). Inst. for Geophysics
  2. Univ. Nacional de La Plata, La Plata (Argentina). Centro de Investigaciones Geologicas
Publication Date:
OSTI Identifier:
5806557
Report Number(s):
CONF-921058-
Journal ID: ISSN 0016-7592; CODEN: GAAPBC
Resource Type:
Conference
Journal Name:
Geological Society of America, Abstracts with Programs; (United States)
Additional Journal Information:
Journal Volume: 24:7; Conference: 1992 annual meeting of the Geological Society of America (GSA), Cincinnati, OH (United States), 26-29 Oct 1992; Journal ID: ISSN 0016-7592
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; ANDES; OROGENESIS; APPALACHIAN MOUNTAINS; PLATE TECTONICS; GEOLOGIC MODELS; GEOLOGIC HISTORY; GONDWANA; MEXICO; NORTH AMERICA; SOUTH AMERICA; DEVELOPING COUNTRIES; LATIN AMERICA; MOUNTAINS; TECTONICS; 580000* - Geosciences

Citation Formats

Dalziel, I W D, Gahagan, L M, and Dalla Salda, L H. North America as an exotic terrane'' and the origin of the Appalachian--Andean Mountain system. United States: N. p., 1992. Web.
Dalziel, I W D, Gahagan, L M, & Dalla Salda, L H. North America as an exotic terrane'' and the origin of the Appalachian--Andean Mountain system. United States.
Dalziel, I W D, Gahagan, L M, and Dalla Salda, L H. Wed . "North America as an exotic terrane'' and the origin of the Appalachian--Andean Mountain system". United States.
@article{osti_5806557,
title = {North America as an exotic terrane'' and the origin of the Appalachian--Andean Mountain system},
author = {Dalziel, I W D and Gahagan, L M and Dalla Salda, L H},
abstractNote = {North America was sutured to Gondwana in the terminal Alleghanian event of Appalachian orogenesis, thus completing the late Paleozoic assembly of Pangea. The suggestion that the Pacific margins of East Antarctica-Australia and Laurentia may have been juxtaposed during the Neoproterozoic prompts reevaluation of the widely held assumptions that the ancestral Appalachian margin rifted from northwestern Africa during the earliest Paleozoic opening of Iapetus, and remained juxtaposed to that margin, even though widely separated from it at times, until the assembly of Pangea. The lower Paleozoic carbonate platform of northwestern Argentina has been known for a long time to contain Olenellid trilobites of the Pacific or Columbian realm. Although normally regarded as some kind of far-travelled terrane that originated along the Appalachian margin of Laurentia, it has recently been interpreted as a fragment detached from the Ouachita embayment of Laurentia following Taconic-Famatinian collision with Gondwana during the Ordovician. The Oaxaca terrane of Mexico, on the other hand, contains a Tremadocian trilobite fauna of Argentine-Bolivian affinities, and appears to have been detached from Gondwana following the same collision. The Wilson cycle'' of Iapetus ocean basin opening and closing along the Appalachian and Andean orogens may have involved more than one such continental collision during clockwise drift of Laurentia around South America following late Neoproterozoic to earliest Cambrian separation. Together with the collisions of baltic and smaller terranes with Laurentia, this could explain the protracted Paleozoic orogenic history of both the Appalachian and proto-Andean orogens.},
doi = {},
url = {https://www.osti.gov/biblio/5806557}, journal = {Geological Society of America, Abstracts with Programs; (United States)},
issn = {0016-7592},
number = ,
volume = 24:7,
place = {United States},
year = {1992},
month = {1}
}

Conference:
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