Strain variations in an ancient accretionary complex: implications for forearc evolution

Article Abstract:

The Kodiak Formation, part of an accretionary prism in the Alaskan convergent margin, is analyzed for a reconstruction of the margin forearc's unroofing, underplating and strain history. The formation is composed of landward, central and seaward belts. The results suggest two intervals of wedge thickening resulting from penetrative strain and underplating. Late Cretaceous to middle Tertiary subaerial exposure and erosional unroofing were concurrent with these thickening intervals.

Alaska, Rock deformation, Geodynamics

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Kinematic analyses of the Hsuehshan Range, Taiwan: a large-scale pop-up structure

Article Abstract:

The kinematics of deformation in the Hsuehshan Range is analyzed. The Hsuehshan Range is an anticlinorium cored by biotite grade rocks, and it exposes higher-grade Eo-Oligocene rocks in the center of the Taiwan mountain belt and is flanked on either side by lower-grade Miocene rocks. Moreover, the eastern Hsuehshan Range have coaxial strain histories and strain magnitudes generally increase toward the hinterland.

Taiwan

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Central Costa Rica deformed belt: Kinematics of diffuse faulting across the western Panama block

Article Abstract:

A diffuse fault zone is revealed from fault kinematics, seismicity, and geodetic data throughout central Costa Rica.

Costa Rica

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