U–Pb dating of middle Eocene–Pliocene multiple tectonic pulses in the Alpine foreland

<p>Foreland fold-and-thrust belts (FTBs) record long-lived tectono-sedimentary activity, from passive margin sedimentation, flexuring, and further evolution into wedge accretion ahead of an advancing orogen. Therefore, dating fault activity is fundamental for plate movement reconstruction, res...

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Autores principales:	L. Smeraglia, N. Looser, O. Fabbri, F. Choulet, M. Guillong, S. M. Bernasconi
Formato:	article
Lenguaje:	EN
Publicado:	Copernicus Publications 2021
Materias:	Geology QE1-996.5 Stratigraphy QE640-699
Acceso en línea:	https://doaj.org/article/c6a5ea595903400a9389d0f0545c4916
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spelling	oai:doaj.org-article:c6a5ea595903400a9389d0f0545c49162021-11-09T12:44:19ZU–Pb dating of middle Eocene–Pliocene multiple tectonic pulses in the Alpine foreland10.5194/se-12-2539-20211869-95101869-9529https://doaj.org/article/c6a5ea595903400a9389d0f0545c49162021-11-01T00:00:00Zhttps://se.copernicus.org/articles/12/2539/2021/se-12-2539-2021.pdfhttps://doaj.org/toc/1869-9510https://doaj.org/toc/1869-9529<p>Foreland fold-and-thrust belts (FTBs) record long-lived tectono-sedimentary activity, from passive margin sedimentation, flexuring, and further evolution into wedge accretion ahead of an advancing orogen. Therefore, dating fault activity is fundamental for plate movement reconstruction, resource exploration, and earthquake hazard assessment. Here, we report U–Pb ages of syn-tectonic calcite mineralizations from four thrusts and three tear faults sampled at the regional scale across the Jura fold-and-thrust belt in the northwestern Alpine foreland (eastern France). Three regional tectonic phases are recognized in the middle Eocene–Pliocene interval: (1) pre-orogenic faulting at <span class="inline-formula">48.4±1.5</span> and <span class="inline-formula">44.7±2.6</span> Ma associated with the far-field effect of the Alpine or Pyrenean compression, (2) syn-orogenic thrusting at <span class="inline-formula">11.4±1.1</span>, <span class="inline-formula">10.6±0.5</span>, <span class="inline-formula">9.7±1.4</span>, <span class="inline-formula">9.6±0.3</span>, and <span class="inline-formula">7.5±1.1</span> Ma associated with the formation of the Jura fold-and-thrust belt with possible in-sequence thrust propagation, and (3) syn-orogenic tear faulting at <span class="inline-formula">10.5±0.4</span>, <span class="inline-formula">9.1±6.5</span>, <span class="inline-formula">5.7±4.7</span>, and at <span class="inline-formula">4.8±1.7</span> Ma including the reactivation of a pre-orogenic fault at <span class="inline-formula">3.9±2.9</span> Ma. Previously unknown faulting events at <span class="inline-formula">48.4±1.5</span> and <span class="inline-formula">44.7±2.6</span> Ma predate the reported late Eocene age for tectonic activity onset in the Alpine foreland by <span class="inline-formula">∼10</span> Myr. In addition, we date the previously inferred reactivation of pre-orogenic strike-slip faults as tear faults during Jura imbrication. The U–Pb ages document a minimal time frame for the evolution of the Jura FTB wedge by possible in-sequence thrust imbrication above the low-friction basal decollement consisting of evaporites.</p>L. SmeragliaL. SmeragliaL. SmeragliaN. LooserO. FabbriF. ChouletM. GuillongS. M. BernasconiCopernicus PublicationsarticleGeologyQE1-996.5StratigraphyQE640-699ENSolid Earth, Vol 12, Pp 2539-2551 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Geology QE1-996.5 Stratigraphy QE640-699
spellingShingle	Geology QE1-996.5 Stratigraphy QE640-699 L. Smeraglia L. Smeraglia L. Smeraglia N. Looser O. Fabbri F. Choulet M. Guillong S. M. Bernasconi U–Pb dating of middle Eocene–Pliocene multiple tectonic pulses in the Alpine foreland
description	<p>Foreland fold-and-thrust belts (FTBs) record long-lived tectono-sedimentary activity, from passive margin sedimentation, flexuring, and further evolution into wedge accretion ahead of an advancing orogen. Therefore, dating fault activity is fundamental for plate movement reconstruction, resource exploration, and earthquake hazard assessment. Here, we report U–Pb ages of syn-tectonic calcite mineralizations from four thrusts and three tear faults sampled at the regional scale across the Jura fold-and-thrust belt in the northwestern Alpine foreland (eastern France). Three regional tectonic phases are recognized in the middle Eocene–Pliocene interval: (1) pre-orogenic faulting at <span class="inline-formula">48.4±1.5</span> and <span class="inline-formula">44.7±2.6</span> Ma associated with the far-field effect of the Alpine or Pyrenean compression, (2) syn-orogenic thrusting at <span class="inline-formula">11.4±1.1</span>, <span class="inline-formula">10.6±0.5</span>, <span class="inline-formula">9.7±1.4</span>, <span class="inline-formula">9.6±0.3</span>, and <span class="inline-formula">7.5±1.1</span> Ma associated with the formation of the Jura fold-and-thrust belt with possible in-sequence thrust propagation, and (3) syn-orogenic tear faulting at <span class="inline-formula">10.5±0.4</span>, <span class="inline-formula">9.1±6.5</span>, <span class="inline-formula">5.7±4.7</span>, and at <span class="inline-formula">4.8±1.7</span> Ma including the reactivation of a pre-orogenic fault at <span class="inline-formula">3.9±2.9</span> Ma. Previously unknown faulting events at <span class="inline-formula">48.4±1.5</span> and <span class="inline-formula">44.7±2.6</span> Ma predate the reported late Eocene age for tectonic activity onset in the Alpine foreland by <span class="inline-formula">∼10</span> Myr. In addition, we date the previously inferred reactivation of pre-orogenic strike-slip faults as tear faults during Jura imbrication. The U–Pb ages document a minimal time frame for the evolution of the Jura FTB wedge by possible in-sequence thrust imbrication above the low-friction basal decollement consisting of evaporites.</p>
format	article
author	L. Smeraglia L. Smeraglia L. Smeraglia N. Looser O. Fabbri F. Choulet M. Guillong S. M. Bernasconi
author_facet	L. Smeraglia L. Smeraglia L. Smeraglia N. Looser O. Fabbri F. Choulet M. Guillong S. M. Bernasconi
author_sort	L. Smeraglia
title	U–Pb dating of middle Eocene–Pliocene multiple tectonic pulses in the Alpine foreland
title_short	U–Pb dating of middle Eocene–Pliocene multiple tectonic pulses in the Alpine foreland
title_full	U–Pb dating of middle Eocene–Pliocene multiple tectonic pulses in the Alpine foreland
title_fullStr	U–Pb dating of middle Eocene–Pliocene multiple tectonic pulses in the Alpine foreland
title_full_unstemmed	U–Pb dating of middle Eocene–Pliocene multiple tectonic pulses in the Alpine foreland
title_sort	u–pb dating of middle eocene–pliocene multiple tectonic pulses in the alpine foreland
publisher	Copernicus Publications
publishDate	2021
url	https://doaj.org/article/c6a5ea595903400a9389d0f0545c4916
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U–Pb dating of middle Eocene–Pliocene multiple tectonic pulses in the Alpine foreland

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