Evidence of flexural shear folding associated with extensional faults: discussion and reply

Article Abstract:

An earlier study hypothesized the association of flexural folding with extensional folding. While this postulate is not challenged, the field evidence chosen for the hypothesis is criticized. Butte 4990 is dominated by oblique slip faulting instead of extensional dip-slip faulting and is a monoclinal flexure with significant sinistral stike-slip motion. The original author attribute this criticism to a difference in interpretation of Butte 4990. Though not evident in the outcrop, they believe that the area is a N-NW/S-SW-trending extensional fault propagation fold associated with a W-SW- trending master fault.

Strike-slip faults (Geology), Strike-slip faults

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From oceanic closure to continental collision: a synthesis of the "schistes lustres" metamorphic complex of the Western Alps: alternative interpretation and reply

Article Abstract:

The interpretation of earlier studies in the Late Cretaceous-Tertiary 'schistes lustres' complex of western Switzerland, Savoy and Queyras is challenged. It is suggested that the whole area is a mass of ocean-derived ophiolite and metasedimentary rocks with east-west-trending folds which originated after the obduction on the European margin during continental collision and that Queyras has a different tectonic history from Savoy and Valais. The original authors agree that data on the Queyras region is still incomplete but maintain their conclusions on the relationship of the Queyras area to Savoy and Valais.

Research, Alps, Origin, Rocks, Metamorphic, Metamorphic rocks, Ophiolites, Schists

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Crustal shortening and vertical strain partitioning in the Middle Atlas Mountains of Morocco

Article Abstract:

Geological field mapping has revealed the existence of vertical strain partitioning and crustal shortening in Morocco's Middle Atlas Mountains. Geophysical information showed that the contraction has not created a significant crustal root underneath the fold belt. The apparent discrepancy in crustal thickening may be attributed to the shortening of the upper crust due to thickening and the corresponding lateral deformation of the lower crust.

Atlas Mountains

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