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Title: The displaced eugeoclinal rocks in the El Paso Mountains and northern Mojave Desert: A Triassic sliver

Abstract

Many workers have drawn attention to the displaced eugeoclinal rocks in the northern Mojave Desert and El Paso Mountains and their importance in models for the development of an active continental margin in the western Cordillera. Existing models can generally for either strike-slip juxtaposition or thrust emplacement. New field data, U-Pb zircon geochronology, and isotopic data for metasedimentary rocks and plutons in the northern Mojave Desert and El Paso Mountains shed light on the timing and mechanism of emplacement of the eugeoclinal allocthon. The observations and data above indicate that Early Triassic plutons in the northern Mojave Desert came through oceanic lithosphere but later Jurassic plutons intercepted continental lithosphere. The authors suggest a model where eugeoclinal rocks were deposited on oceanic crust which was initially brought southward along a strike-slip fault and later thrust eastward over the cratonal assemblage. Permian thrusting is incompatible with their data and observations. Intrusion of lower Triassic strata by Early Triassic plutons in the Lane Mountain area permits some Early Triassic thrusting but the oceanic affinity of the plutons implies that thrusting did not involve continental lithosphere.

Authors:
;  [1]; ;  [2]
  1. Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Geology
  2. Univ. of Kansas, Lawrence, KS (United States). Dept. of Geology
Publication Date:
OSTI Identifier:
5019456
Report Number(s):
CONF-9305259-
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: 25:5; Conference: 89. annual meeting of the Cordilleran Section and the 46th annual meeting of the Rocky Mountain Section of the Geological Society of America (GSA), Reno, NV (United States), 19-21 May 1993; Journal ID: ISSN 0016-7592
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; CALIFORNIA; GEOLOGIC DEPOSITS; PLATE TECTONICS; ISOTOPE DATING; PETROGENESIS; PLUTONIC ROCKS; CONTINENTAL MARGIN; GEOLOGIC FAULTS; GEOLOGIC HISTORY; GEOLOGIC MODELS; ISOTOPE RATIO; LEAD ISOTOPES; OCEANIC CRUST; TRIASSIC PERIOD; URANIUM ISOTOPES; ZIRCON; ACTINIDE ISOTOPES; AGE ESTIMATION; DEVELOPED COUNTRIES; EARTH CRUST; GEOLOGIC AGES; GEOLOGIC FRACTURES; GEOLOGIC STRUCTURES; GEOLOGY; IGNEOUS ROCKS; ISOTOPES; MESOZOIC ERA; MINERALS; NORTH AMERICA; PETROLOGY; ROCKS; SILICATE MINERALS; TECTONICS; USA; 580000* - Geosciences

Citation Formats

Miller, J S, Glazner, A F, Walker, J D, and Martin, M W. The displaced eugeoclinal rocks in the El Paso Mountains and northern Mojave Desert: A Triassic sliver. United States: N. p., 1993. Web.
Miller, J S, Glazner, A F, Walker, J D, & Martin, M W. The displaced eugeoclinal rocks in the El Paso Mountains and northern Mojave Desert: A Triassic sliver. United States.
Miller, J S, Glazner, A F, Walker, J D, and Martin, M W. 1993. "The displaced eugeoclinal rocks in the El Paso Mountains and northern Mojave Desert: A Triassic sliver". United States.
@article{osti_5019456,
title = {The displaced eugeoclinal rocks in the El Paso Mountains and northern Mojave Desert: A Triassic sliver},
author = {Miller, J S and Glazner, A F and Walker, J D and Martin, M W},
abstractNote = {Many workers have drawn attention to the displaced eugeoclinal rocks in the northern Mojave Desert and El Paso Mountains and their importance in models for the development of an active continental margin in the western Cordillera. Existing models can generally for either strike-slip juxtaposition or thrust emplacement. New field data, U-Pb zircon geochronology, and isotopic data for metasedimentary rocks and plutons in the northern Mojave Desert and El Paso Mountains shed light on the timing and mechanism of emplacement of the eugeoclinal allocthon. The observations and data above indicate that Early Triassic plutons in the northern Mojave Desert came through oceanic lithosphere but later Jurassic plutons intercepted continental lithosphere. The authors suggest a model where eugeoclinal rocks were deposited on oceanic crust which was initially brought southward along a strike-slip fault and later thrust eastward over the cratonal assemblage. Permian thrusting is incompatible with their data and observations. Intrusion of lower Triassic strata by Early Triassic plutons in the Lane Mountain area permits some Early Triassic thrusting but the oceanic affinity of the plutons implies that thrusting did not involve continental lithosphere.},
doi = {},
url = {https://www.osti.gov/biblio/5019456}, journal = {Geological Society of America, Abstracts with Programs; (United States)},
issn = {0016-7592},
number = ,
volume = 25:5,
place = {United States},
year = {Thu Apr 01 00:00:00 EST 1993},
month = {Thu Apr 01 00:00:00 EST 1993}
}

Conference:
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