Thick-skinned versus thin-skinned thrusting: rheology controlled thrust propagation in the Variscan collisional belt (The southeastern Bohemian Massif, Czech Republic - Austria)

Article Abstract:

A tectonic survey of the Variscan collisional belt within the southeastern Bohemian Massif reveals thick-skinned thrusting of hinterland units leading to an inverted metamorphic zonation that contrasts significantly with the thin-skinned foreland units. An investigation of 40 Ar/39 Ar hornblende/muscovite plateau ages of hanging wall units shows complete restoration of intracrystalline argon isotopic systems during Late Variscan thrusting. A rapid exhumation/cooling process combined with thrusting along crystal-scale ramps leads to systematic decrease in Variscan mineral ages.

Observations, Geology, Structural, Structural geology, Isotope geology, Bohemia

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The Limon, Costa Rica earthquake of April 22, 1991: back arc thrusting and collisional tectonics in a subduction environment

Article Abstract:

The local geological record and the distribution of aftershocks in the Costa Rica earthquake that occurred in April 1991 indicate a fault in a blind thrust sheet that becomes shallow towards the northeast. The Caribbean coast of Costa Rica and western Panama exhibit seismic moment that is at least as substantial as that of the subduction zone along the Pacific. The tectonic deformation that took place in the Limon earthquake, however, seems to be a collisional environment rather than an oceanic plate subduction.

Analysis, Costa Rica, Earthquakes, Seismological research

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Tectonic setting of the Sandia pluton: an orogenic 1.4 Ga granite in New Mexico

Article Abstract:

Structural studies of the circa 1.42 Ga Sandia pluton in New Mexico provide insight on synchroneity of magma emplacement, shortening and metamorphism and validate the syntectonic nature of the pluton. The evolution of the pluton is related to pluton and aerosole deformation in both magmatic and solid-states and aureole metamorphism.

New Mexico, Intrusions (Geology)

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