Lithoprobe crustal reflection cross section of the southern Canadian Cordillera, 1, foreland thrust and fold belt to Fraser River fault

Article Abstract:

Images of structures at all levels of the southern Canadian Cordillera, provided by the lithoprobe deep seismic reflection data, reveals a complex and highly reflective crust. The area covered is the interval from the eastern most metamorphic core complexes near Arrow Lakes to the Fraser River. The reflection Moho is the base of the crustal reflectivity. The reflection data indicates that during Cenozoic extension, the Maho and lower crust acted as a zone of detachment. The three major crustal antiforms, namely, the Monashee complex, the Central Nicola horst and the Vernon antiform are also interpreted.

Information management, Seismic reflection method, Seismic reflection surveying, Cordillera Central, Fraser River

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Contrasting Oligocene and Miocene thermal histories from the hanging wall and footwall of the South Tibetan detachment in the central Himalaya from 40Ar/39Ar thermochronology, Marsyandi Valley, central Nepal

Article Abstract:

There is strong evidence of Oligocene regional metamorphism synchronous with the development of significant deformational structures in the Tibetan Sedimentary sequence. This evidence has been obtained from 40Ar/39Ar thermochronologic data for a suite of samples collected from the hanging wall and footwall of the Chame detachment, an extensional shear zone, at the top of the Greater Himalayan sequence in the Marsyandi drainage of central Nepal. It is likely that the cooling of the Greater Himalayan sequence in the Marsyandi transect was the result of unroofing along the Chame detachment.

Geology, Stratigraphic, Stratigraphy, Nepal, Oligocene Epoch

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