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Book Chapter

Synconvergence extension and midcrustal exhumation in the Internal Dinarides

By
Gabriele Casale
Gabriele Casale
Department of Geology, Appalachian State University, ASU Box 32067, Boone, North Carolina 28608-2067, USA
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Richard Bennett
Richard Bennett
Department of Geosciences, University of Arizona, 1040 East 4th Street, Tucson, Arizona 85721, USA
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Darrel Cowan
Darrel Cowan
Department of Earth and Space Sciences, University of Washington, P.O. Box 35130, Seattle, Washington 98195-1310, USA
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Marijana Surkovic
Marijana Surkovic
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Published:
September 11, 2017
Publication history
27 January 2017

ABSTRACT

Final closure of the Neotethys Ocean basin along the Eurasian margin in southeastern Europe during Eocene–Oligocene time was accompanied by upper-crustal extension expressed as a series of low-angle detachments, basins bounded by normal faults, and volcanism. This extensional belt spanned the southern Balkan Peninsula from the Albanides along the southern Adriatic coast in the west to western Anatolia in the east. Despite the widespread occurrence of this phenomenon within the southern Balkan region, similar extension has not previously been observed in association with the Neotethys closure in the Dinarides, which form the western geographic continuation of this orogenic belt, ending in the Austrian Alps in the northwest. The Mid- Bosnian Schist Mountains are a fault-bounded body of greenschist-facies metamorphic rocks located along the paleogeographic margin of the present-day Adria continental block in the Internal Dinarides. We combine low-temperature thermochronometric ages with field observations of kinematic shear sense indicators and demonstrate that the Mid- Bosnian Schist Mountains were exhumed along a normal fault between 43 and 27.5 Ma. The most rapid cooling occurred between ca. 35 and 27 Ma, coincident with a regional-scale magmatic event. These data constitute the first evidence for major extension in the Dinarides contemporaneous with collision between Adria and the Eurasian margin, and they are consistent with removal of a subducting slab during the transition between oceanic subduction and continental collision.

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Contents

GSA Memoirs

Linkages and Feedbacks in Orogenic Systems
CONTAINS OPEN ACCESS

Geological Society of America
Volume
213
ISBN electronic:
9780813782133
Publication date:
September 11, 2017

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