Svartfjella, Eidembukta, and Daudmannsodden lineament: Tertiary orogen-parallel motion in the crystalline hinterland of Spitsbergen's fold-thrust belt

Article Abstract:

The hinterland of Spitsbergen's Tertiary fold-thrust belt on the Svalbard archipelago contains a major orogen-parallel lineament from Svartfjella to Eidembukta to Daudmannsodden (SEDL). Structural analyses suggest three stages of evolution of SEDL. A sinistral motion with a backthrust component followed ENE-directed overthrusting and was followed by dextral strike-slip motion. Thus a change from orogen-perpendicular to orogen-parallel motion is suggested. In the foreland, however, the movements were possibly coeval. A model explains this difference between the hinterland and foreland.

Geology, Stratigraphic, Stratigraphy, Svalbard, Tertiary period

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Comment on "Depositional history of the Eocene Chumstick Formation: Implications of tectonic partitioning for the history of the Leavenworth and Entiat-Eagle Creek fault systems, Washington" by James E. Evans

Article Abstract:

A strike-slip model is more suitable than the extension and strike-slip model given by James E. Evans, to explain the Chumstick and other correlative basins of the central Washington Cascades. An initial isostatic footwall uplift due to extensional deformation in the Leavenworth and Entiat-Eagle Creek fault systems, as suggested by Evans, is impossible. The geology of Leavenworth fault area conflicts with the proposed features of footwall upliftment. There are differences between the vertical and the stratigraphic thickness in the Chumstick Formation.

Washington, Basins (Geology)

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Variations in the along-axis segmentation of the Afar Rift system

Article Abstract:

The along-axis segmentation of the Afar Rift system, Africa, changes from border fault dominated segmentation to magmatic oceanic-style segmentation. The length and the width of the basins in the active rift zones decrease from south to north, and the volume of the Quaternary basaltic magmatism increases. This indicates that the older and longer faults have been replaced by shorter faults. The new border faults generate escarpments that are topographically smaller than those generated by the older border faults.

Analysis, Africa, Magmatism, Rifts (Geology)

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