Low-angle crustal ramp and basin geometry in the Gulf of Lion passive margin: Oligocene-Aquitanian Vistrenque graben, SE France

Article Abstract:

Seismic reflection profiles and borehole data of the Vistrenque graben, SE France, show that the Nimes fault, which bounds the graben to the NW, was a low-angle basement ramp at depth during the Oligocene-Aquitanian rifting. A listric geometry of the fault in the southern part of the graben created a rollover structure and divergent Oligocene-Aquitanian basin fill. In the north, a pseudo-rollover and compensation graben resulted due to the fault's two-segments planar geometry. The Nimes low-angle crustal ramp is a newly formed extensional structure, not related to Pyrenean thrust reactivation.

Geology, Stratigraphic, Stratigraphy, Basins (Geology), Oligocene Epoch

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Graben inversion in nature and experiments

Article Abstract:

Laboratory experiments on sand-silicone models simulate the inversion of crustal-scale basement grabens in nature. Both brittle and ductile configurations are considered for the basement and the sedimentary cover. Mechanical controls of graben inversion such as the angle between graben and compression, the presence of a decollement layer between cover and basement, and the presence of salt diapirs are analyzed. Results from the experiments have been compared with the natural example of the Broad Fourteens Basin, Southern North Sea.

Models, Geology, Structural, Structural geology

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The Acambay graben: active intraarc extension in the trans-Mexican volcanic belt, Mexico

Article Abstract:

The Acambay graben is one of the major troughs within the Chapala-Tula fault zone and an active extension of the trans-Mexican volcanic belt. The active intra-arc is about 40 km long and 15 km wide, with its long axis parallel to the volcanic belt axis. The discrete, 50-70 degree dipping normal fault segments delimits the basin, up to 45 km long and with variation in elevation up to 500 m. The center of the fault segments displays a maximum displacement, which vanishes toward the stepovers between the fault segments.

Mexico, Natural history

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