TY - JOUR A1 - Sobczyk, Artur A1 - Sobel, Edward A1 - Georgieva, Viktoria T1 - Meso-Cenozoic cooling and exhumation history of the Orlica-snie(z) over dotnik Dome (Sudetes, NE Bohemian Massif, Central Europe) BT - insights from apatite fission-track thermochronometry JF - Terra nova N2 - This study presents the first suite of apatite fission-track (AFT) ages from the SE part of the Western Sudetes. AFT cooling ages from the Orlica-snie(z) over dotnik Dome and the Upper Nysa Klodzka Graben range from Late Cretaceous (84 Ma) to Early Palaeocene-Middle Eocene (64-45 Ma). The first stage of basin evolution (similar to 100-90 Ma) was marked by the formation of a local extensional depocentre and disruption of the Mesozoic planation surface. Subsequent far-field convergence of European microplates resulted in Coniacian-Santonian (similar to 89-83 Ma) thrust faulting. AFT data from both metamorphic basement and Mesozoic sedimentary cover indicate homogenous Late Cretaceous burial of the entire Western Sudetes. Thermal history modeling suggests that the onset of cooling could be constrained between 89 and 63 Ma with a climax during the Palaeocene-Middle Eocene basin inversion phase. Y1 - 2019 U6 - https://doi.org/10.1111/ter.12449 SN - 0954-4879 SN - 1365-3121 VL - 32 IS - 2 SP - 122 EP - 133 PB - Wiley CY - Hoboken ER - TY - JOUR A1 - Georgieva, Viktoria A1 - Gallagher, Kerry A1 - Sobczyk, Artur A1 - Sobel, Edward A1 - Schildgen, Taylor F. A1 - Ehlers, Todd A1 - Strecker, Manfred T1 - Effects of slab-window, alkaline volcanism, and glaciation on thermochronometer cooling histories, Patagonian Andes JF - Earth & planetary science letters N2 - Southern Patagonia is a prime example of ongoing oceanic ridge collision and slab-window formation sustained over several million years. The impact of these phenomena on the thermal structure and exhumation of the crust have been mainly assessed with low-temperature thermochronology of bedrock samples. Here, we infer thermal histories from new and existing thermochronological data from the region of most recent ridge collision. In particular, we evaluate the potential far-reaching thermal effects of the evolving slab window, which have previously been considered responsible for patterns of late Miocene reheating associated with back-arc alkaline volcanism. Our model results define protracted cooling since similar to 15 Ma and stepwise exhumation since the late Miocene. The pattern of stepwise exhumation closely matches the onset of Patagonian glaciation at 7 Ma and the successive pulse of glacial incision coeval with neotectonic activity since 3-4 Ma that are also documented by independent geological and geomorphological evidence in the region. Importantly, our findings challenge the recently suggested lack of glacial erosion and incision since 5 Ma in this region. Furthermore, in contrast to previous modelling studies, we find that the available data do not evidence a previously proposed northward-propagating heating event associated with alkaline volcanism. We hypothesize that the anomalous alkaline volcanism in the Patagonian back-arc might be related to trench-orthogonal tears aligned with transform faults in the subducting plate. The substantial differences from the previous modelling procedure on some of the same samples is demonstrated to result from an important lack of convergence in model runs. (C) 2019 Elsevier B.V. All rights reserved. KW - inverse thermal modelling KW - thermochronology KW - apatite (U-Th)/He KW - apatite fission track KW - Patagonian Andes KW - slab window Y1 - 2019 U6 - https://doi.org/10.1016/j.epsl.2019.01.030 SN - 0012-821X SN - 1385-013X VL - 511 SP - 164 EP - 176 PB - Elsevier CY - Amsterdam ER -