Age, Kinematic and Thermal Constraints of Syn-Orogenic Low-Temperature Deformation Events: Insights From Thermochronology and Structural Data of the Nekézseny Thrust (Alpine-Carpathian-Dinaric Area)

被引：2

作者：

Oravecz, Eva ^{[1
]}

Benko, Zsolt ^{[2
,3
]}

Arato, Robert ^{[2
,4
]}

Dunkl, Istvan ^{[4
]}

Heja, Gabor ^{[5
]}

Kover, Szilvia ^{[1
,6
]}

Nemeth, Tibor ^{[7
]}

Fodor, Laszlo ^{[1
,6
]}

机构：

[1] Eotvos Lorand Univ, Inst Geog & Earth Sci, Dept Phys & Appl Geol, Budapest, Hungary

[2] Inst Nucl Res Hungarian Acad Sci, Inst Nucl Res, Debrecen, Hungary

[3] Univ Debrecen, Inst Earth Sci, Dept Mineral & Geol, Debrecen, Hungary

[4] Univ Gottingen, Geosci Ctr, Dept Sedimentol & Environm Geol, Gottingen, Germany

[5] Supervisory Author Regulatory Affairs, Budapest, Hungary

[6] Hungarian Res Network, Inst Earth Phys & Space Sci, Sopron, Hungary

[7] Univ Pecs, Inst Geog & Earth Sci, Dept Geol & Meteorol, Pecs, Hungary

来源：

TECTONICS | 2024年 / 43卷 / 04期

关键词：

Gosau basin; Alps-Carpathians-Dinarides orogenic belt; thermochronology; fault gouge dating; apatite fission track; apatite (U-Th)/He thermochronology; NORTHERN CALCAREOUS ALPS; VARDAR-MELIATA BRANCH; MOUNTAINS NE HUNGARY; EASTERN ALPS; WESTERN CARPATHIANS; TECTONIC EVOLUTION; BUKK MOUNTAINS; FAULT-ZONE; MEDVEDNICA MOUNTAINS; SHALLOW FAULTS;

D O I：

10.1029/2023TC008189

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Unraveling the age and kinematics of low temperature deformation events is crucial in understanding the late-stage evolution of orogens. However, accurate age constraints can often be challenging to obtain due to unideal outcrop conditions, large sedimentary hiatuses or the lack of well-defined thermal events. In this study, we show on the example of the Nekezseny Thrust, a poorly exposed late orogenic thrust in the southern Western Carpathians, that a combined approach of structural analysis and multi-method thermochronology can provide the necessary temporal, kinematic and thermal constraints for a detailed reconstruction of the deformation history. While structural mapping revealed that the Late Cretaceous Uppony Gosau Basin in the footwall of the Nekezseny Thrust underwent a significant post-Campanian and pre-Miocene shortening, K/Ar dating of fault gouge samples from the main fault zone constrained the primary thrusting event to the Maastrichtian. Based on the acquired apatite fission-track and (U-Th)/He ages, subsequent heating of the Upper Cretaceous sediments due to tectonic burial was limited to 75-100 degrees C, followed by deformation-related and gradual cooling between the Eocene and Early Miocene. Considering the reconstructed deformation history, as well as the large-scale tectonic affinity of the displaced units in its footwall and hanging wall, the Nekezseny Thrust is a far-traveled (ca. 600 km) segment of the Late Cretaceous Alps-Dinarides contact zone, whose development was linked to the switch from lower plate to upper plate position with respect to the Sava Zone and Alpine Tethys sutures, respectively. Detailed structural analysis is combined with three thermochronological methods to reconstruct low temperature deformation events K/Ar age of fault gouges date the fault activity directly, while apatite fission-track and (U-Th)/He data constrain the exhumation history The Maastrichtian age of the Nekezseny Thrust is interpreted in lights of the late-stage Alpine-Carpathian-Dinaric tectonic evolution

引用

页数：28