Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | 103865 |
| Fachzeitschrift | Journal of structural geology |
| Jahrgang | 127 |
| Frühes Online-Datum | 21 Juli 2019 |
| Publikationsstatus | Veröffentlicht - Okt. 2019 |
Abstract
The central Menderes Massif in western Turkey is a bivergent metamorphic core complex characterised by two detachment faults that operated with opposite sense of shear. Here, we present K–Ar ages and hydrogen isotope data for fault gouge as well as fission track and (U–Th)/He ages for apatite and zircon from bedrock samples to constrain the timing of detachment faulting. Comparison of the K–Ar ages and low-temperature thermochronologic ages indicates brittle faulting at temperatures between ~240 and ~70 °C. At the western termination of the Gediz detachment, K–Ar ages between ~12 and ~5 Ma suggest rather continuous faulting since the mid-Miocene; a Pliocene phase of rapid slip is mainly recorded in the eastern part of this detachment. In contrast, K–Ar ages from the Büyük Menderes detachment cluster at 22–16 and 9–3 Ma and provide evidence for two phases of faulting, which is in accordance with new and published low-temperature thermochronologic data. Hydrogen isotope ratios of −76 to −115‰ indicate infiltration of meteoric water during detachment faulting and gouge formation. The youngest K–Ar ages and cooling histories for hanging and footwall rocks imply that the activity of both detachments ended ~3 Ma ago when the currently active grabens were established.
ASJC Scopus Sachgebiete
- Erdkunde und Planetologie (insg.)
- Geologie
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in: Journal of structural geology, Jahrgang 127, 103865, 10.2019.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Detachment faulting in a bivergent core complex constrained by fault gouge dating and low-temperature thermochronology
AU - Heineke, Caroline
AU - Hetzel, Ralf
AU - Nilius, Nils Peter
AU - Zwingmann, H.
AU - Todd, Andrew
AU - Mulch, Andreas
AU - Wölfler, Andreas
AU - Glotzbach, Christoph
AU - Akal, Cüneyt
AU - Dunkl, István
AU - Raven, Mark
AU - Hampel, Andrea
N1 - Funding information: This study was funded by the Deutsche Forschungsgemeinschaft ( DFG ) grants HE 1704/18–1 and GL 724/7–1 provided to R. Hetzel and C. Glotzbach, and by the Leibniz Universität Hannover (start-up funds to A. Hampel). We thank Cris Lana and Espen Torgersen for their insightful reviews, which significantly improved the original version of the manuscript.
PY - 2019/10
Y1 - 2019/10
N2 - The central Menderes Massif in western Turkey is a bivergent metamorphic core complex characterised by two detachment faults that operated with opposite sense of shear. Here, we present K–Ar ages and hydrogen isotope data for fault gouge as well as fission track and (U–Th)/He ages for apatite and zircon from bedrock samples to constrain the timing of detachment faulting. Comparison of the K–Ar ages and low-temperature thermochronologic ages indicates brittle faulting at temperatures between ~240 and ~70 °C. At the western termination of the Gediz detachment, K–Ar ages between ~12 and ~5 Ma suggest rather continuous faulting since the mid-Miocene; a Pliocene phase of rapid slip is mainly recorded in the eastern part of this detachment. In contrast, K–Ar ages from the Büyük Menderes detachment cluster at 22–16 and 9–3 Ma and provide evidence for two phases of faulting, which is in accordance with new and published low-temperature thermochronologic data. Hydrogen isotope ratios of −76 to −115‰ indicate infiltration of meteoric water during detachment faulting and gouge formation. The youngest K–Ar ages and cooling histories for hanging and footwall rocks imply that the activity of both detachments ended ~3 Ma ago when the currently active grabens were established.
AB - The central Menderes Massif in western Turkey is a bivergent metamorphic core complex characterised by two detachment faults that operated with opposite sense of shear. Here, we present K–Ar ages and hydrogen isotope data for fault gouge as well as fission track and (U–Th)/He ages for apatite and zircon from bedrock samples to constrain the timing of detachment faulting. Comparison of the K–Ar ages and low-temperature thermochronologic ages indicates brittle faulting at temperatures between ~240 and ~70 °C. At the western termination of the Gediz detachment, K–Ar ages between ~12 and ~5 Ma suggest rather continuous faulting since the mid-Miocene; a Pliocene phase of rapid slip is mainly recorded in the eastern part of this detachment. In contrast, K–Ar ages from the Büyük Menderes detachment cluster at 22–16 and 9–3 Ma and provide evidence for two phases of faulting, which is in accordance with new and published low-temperature thermochronologic data. Hydrogen isotope ratios of −76 to −115‰ indicate infiltration of meteoric water during detachment faulting and gouge formation. The youngest K–Ar ages and cooling histories for hanging and footwall rocks imply that the activity of both detachments ended ~3 Ma ago when the currently active grabens were established.
KW - Detachment faulting
KW - Fault gouge
KW - Hydrogen isotopes
KW - K–Ar dating
KW - Menderes massif
KW - Thermochronology
UR - http://www.scopus.com/inward/record.url?scp=85069655670&partnerID=8YFLogxK
U2 - 10.1016/j.jsg.2019.103865
DO - 10.1016/j.jsg.2019.103865
M3 - Article
AN - SCOPUS:85069655670
VL - 127
JO - Journal of structural geology
JF - Journal of structural geology
SN - 0191-8141
M1 - 103865
ER -