Studies of Permian strata of
west Texas–New Mexico have illuminated many classic stratigraphic concepts,
including the notion of lowstand siliciclastic bypass. Although a final, lowstand
origin for the basinal siliciclastics in this area is evident, the provenance
of the voluminous deposits has been widely debated, with most studies
suggesting the Ancestral Rocky Mountains. Soreghan and Soreghan refute this
interpretation. Results, including provenance spectra, are most consistent with
sources in the Ouachita system and terranes south of the Ouachita system, with
contributions from as far away as the Appalachian region. These complex transport pathways are
interpreted to have involved fluvial transport, ultimate eolian delivery, and
atmospheric circulation that exhibited both zonal and monsoonal components. This
paper represents the first contribution of detrital zircon approaches to this
world-class system, and contributes to paleotectonic and paleoclimatic
interpretations for western equatorial Pangaea.
Tracingclastic delivery to the Permian Delaware Basin, U.S.A.: implications forpaleogeography and circulation in westernmost equatorial Pangea by Gerilyn
S. Soreghan and Michael J. Soreghan
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