Title |
From nappe stacking to exhumation: Cretaceous tectonics in the Apuseni Mountains (Romania)
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Published in |
International Journal of Earth Sciences, May 2016
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DOI | 10.1007/s00531-016-1335-y |
Pubmed ID | |
Authors |
Martin Kaspar Reiser, Ralf Schuster, Richard Spikings, Peter Tropper, Bernhard Fügenschuh |
Abstract |
New Ar-Ar muscovite and Rb-Sr biotite age data in combination with structural analyses from the Apuseni Mountains provide new constraints on the timing and kinematics of deformation during the Cretaceous. Time-temperature paths from the structurally highest basement nappe of the Apuseni Mountains in combination with sedimentary data indicate exhumation and a position close to the surface after the Late Jurassic emplacement of the South Apuseni Ophiolites. Early Cretaceous Ar-Ar muscovite ages from structurally lower parts in the Biharia Nappe System (Dacia Mega-Unit) show cooling from medium-grade conditions. NE-SW-trending stretching lineation and associated kinematic indicators of this deformation phase (D1) are overprinted by top-NW-directed thrusting during D2. An Albian to Turonian age (110-90 Ma) is proposed for the main deformation (D2) that formed the present-day geometry of the nappe stack and led to a pervasive retrograde greenschist-facies overprint. Thermochronological and structural data from the Bihor Unit (Tisza Mega-Unit) allowed to establish E-directed differential exhumation during Early-Late Cretaceous times (D3.1). Brittle detachment faulting (D3.2) and the deposition of syn-extensional sediments indicate general uplift and partial surface exposure during the Late Cretaceous. Brittle conditions persist during the latest Cretaceous compressional overprint (D4). |
Mendeley readers
Geographical breakdown
Country | Count | As % |
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Unknown | 26 | 100% |
Demographic breakdown
Readers by professional status | Count | As % |
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Student > Ph. D. Student | 6 | 23% |
Researcher | 4 | 15% |
Student > Master | 4 | 15% |
Student > Bachelor | 3 | 12% |
Lecturer > Senior Lecturer | 1 | 4% |
Other | 1 | 4% |
Unknown | 7 | 27% |
Readers by discipline | Count | As % |
---|---|---|
Earth and Planetary Sciences | 13 | 50% |
Environmental Science | 3 | 12% |
Biochemistry, Genetics and Molecular Biology | 2 | 8% |
Unknown | 8 | 31% |