Southeast end of the late Paleozoic southwestern Laurentian borderland: ¿Qué pasó?
Document Type
Abstract
Publication Date
10-25-2017
Publication Title
Geological Society of America Abstracts with Programs
Volume
49
Issue
6
Abstract
The Southwestern Laurentian Borderland (SLaB) tectonic model for the western margin of Laurentia incorporates left slip along the southwestern plate margins with inboard transpressional deformation and explains numerous observations of geologic phenomena during late Paleozoic (Mississippian-middle Permian) time. These phenomena include marginal basin development, widespread unconformities in the upper Paleozoic section, truncation of the early Paleozoic Cordilleran miogeocline, microplate translation, and ongoing deformation in Nevada and southern California between the Antler and Sonoma orogenic events. The separation of the Caborca block (Caborca), now in northern Sonora, from its original position near Death Valley took place by southward propagation of the Slide Mountain ocean/Havallah basin via long left-slip transforms and short spreading centers as Laurentia migrated latitudinally north. The history of Caborca after separation is a critical aspect of the SLaB tectonic development.
Language
eng
Repository Citation
Lawton, T.,
Cashman, P. H.,
Taylor, W. J.
(2017).
Southeast end of the late Paleozoic southwestern Laurentian borderland: ¿Qué pasó?.
Geological Society of America Abstracts with Programs, 49(6),
http://dx.doi.org/10.1130/abs/2017AM-306967