A dynamic model of extension in the Baltimore Canyon trough region

Article Abstract:

Dynamic extension in the Baltimore Canyon trough is modelled as two-staged rifting determined by crustal and mantle weaknesses beneath the Appalachian orogen. Late Triassic-Early Jurassic rift basins and a horizontal pressure gradient formed due to upper crustal extension and thinning. This pressure gradient may have effected magma transport into the Triassic basin province. The locus of crustal extension shifted over preexisting mantle weaknesses in the final stages of rifting. The onset of seafloor spreading marked the end of extension focus beneath the trough's eastern edge.

Models, Geodynamics, Baltimore Canyon (Atlantic Ocean)

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Oblique-slip deformation in extensional terrains: a case study of the Lakes Tanganyika and Malawi rift zones

Article Abstract:

Passive continental margin evolution is examined in the context of the East African Rift system via seismic surveying of Lakes Tanganyika and Malawi. Fault geometries that are difficult to retrodeform are obtained from rift elongation profiles. Northwest or southeast dipping shallow faults and hanging wall sediments are evident. Oblique extension of and strike-slip motion along the fault systems underlying the lakes are implied. Basement-influenced oblique-slip extension best explains the data.

Faults (Geology), Lake Nyasa, Lake Tanganyika

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Gravity constraints on lithosphere flexure and the structure of the late Paleozoic Ouachita orogen in Arkansas and Oklahoma, south central North America

Article Abstract:

A spectral analysis was conducted on the Bouguer gravity anomalies in eastern Oklahoma and western central Arkansas. Results show that the crustal thickness of the fold and thrust belt rises from 38 km to 44 km from the western to the eastern Ouachitas. Results also reveal that the thickness in the eastern Ouachitas causes anomalously weak lithosphere and is due to the eastward transition of the Paleozoic continental margin from a rift to a transform segment.

Geology, Stratigraphic, Stratigraphy, Paleozoic Era, Gravity, Gravity (Force), Ouachita Mountains

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