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\begin{document}

\title{Absolute age and temperature constraints on faulting along the basal
d\selectlanguage{ngerman}écollement of the Jura fold-and-thrust belt from carbonate U-Pb dating
and clumped isotopes\selectlanguage{english}}



\author[1]{Nathan Looser}%
\author[2]{Herfried Madritsch}%
\author[1]{Marcel Guillong}%
\author[3]{Oscar Laurent}%
\author[1]{Stephan Wohlwend}%
\author[4]{Stefano M. Bernasconi}%
\affil[1]{Department of Earth Sciences, ETH Zurich}%
\affil[2]{Nagra}%
\affil[3]{Unknown}%
\affil[4]{ETH-Zurich}%


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  \date{May 26, 2024}


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\selectlanguage{english}
\begin{abstract}
During its late-stage evolution, the European Alpine orogen witnessed a
northwest-directed propagation of its deformation front along an
evaporitic basal d\selectlanguage{ngerman}écollement into the foreland. This resulted in the
decoupling of the northern Alpine Molasse Basin from its basement and
the formation of the Jura fold-and-thrust belt. Here, we present the
first absolute age and temperature constraints on deformation along this
basal décollement using combined carbonate U-Pb LA-ICP-MS dating and
clumped isotope thermometry. We analyzed calcite veins associated with a
thrust fault branching off from the basal décollement in the distal
Molasse Basin and slickenfibers from thrusts and strike-slip faults in
the eastern Jura Mountains. Our U-Pb data provide evidence for tectonic
activity related to Alpine contraction in this region between
\textasciitilde{}14.5 Ma and \textasciitilde{}4.5 Ma ago. Accordingly,
the propagation of Alpine deformation into the distal foreland along the
basal décollement occurred earlier than commonly inferred by
biostratigraphy, at Middle Miocene (Langhian) times at the latest.
Younger deformation ages between \textasciitilde{}11.5 and
\textasciitilde{}4.5 Ma correspond very well in time with shortening in
the Subalpine Molasse and the Central Alps proving simultaneous tectonic
activity along both thrust fronts; e.g. the Jura Mountains and the
Subalpine Molasse. Clumped isotopes reveal vein calcite precipitation at
temperatures between 53 and 104 °C from fluids with oxygen isotope
compositions between -6.2 and +9.5 \selectlanguage{english}%0. Our data show that the burial
conditions in the studied area remained constant between
\textasciitilde{}14.5 Ma and \textasciitilde{}4.5 Ma indicating that the
previously reported large-scale foreland erosion initiated after
\textasciitilde{}4.5 Ma.%
\end{abstract}\selectlanguage{ngerman}%



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