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- W3136018259 abstract "<p><strong>Tectono-stratigraphic evidence of </strong><strong>salt tectonics</strong><strong>&#160;</strong><strong>during</strong><strong>&#160;</strong><strong>Jurassic</strong><strong> extension</strong><strong>&#160;</strong><strong>in </strong><strong>the Corbi&#232;res </strong><strong>nappe</strong><strong>, </strong><strong>Eastern Pyrenees, France</strong></p><p><strong>&#160;</strong>Antoine Cr&#233;mades<sup>1</sup>, Mary Ford<sup>1</sup>&#160;et Julien Charreau<sup>1</sup></p><p><sup>1</sup>&#160;CRPG, UMR 7358 CNRS, Universit&#233; de Lorraine, Vandoeuvre&#8208;l&#232;s&#8208;Nancy, France</p><p>&#160;</p><p>In this work, we&#160;investigate the tectono-stratigraphic architecture of a major transfer zone in&#160;the Mesozoic Pyrenean rift system and its subsequent alpine inversion.&#160;The NE-SW to NS-oriented Corbi&#232;res transfert zone&#160;(70km long)&#160;lies between the EW-oriented Pyrenean&#160;(400km long)&#160;and Proven&#231;al&#160;(300km long)&#160;segments&#160;of the Pyrenean orogen. This salt-rich&#160;rift transfert zone was inverted during the Pyrenean orogenesis&#160;(late Santonian - Early Miocene). During the Oligo-Miocene,&#160;most of the&#160;transfert zone was further reactivated&#160;to form the northern&#160;margin&#160;of the Gulf of &#160;Lion rift.&#160;Thus, only the lateral equivalent of the North Pyrenean Zone outcrops&#160;along the western French Mediterranean coast. Unlike the the North Pyrenean Zone,&#160;which is&#160;a narrow fold and thrust belt,&#160;this proximal part of the tranfert zone&#160;was&#160;previously interpreted as a large thrust sheet (the Corbi&#232;res Nappe, 70km long)&#160;corresponding to Mesozoic cover decoupled from Variscan&#160;basement&#160;along a thick level of Upper&#160;Triassic&#160;evaporites&#160;(Keuper,&#160;0m&#160;to 655m) and emplaced&#160;onto the Aquitaine retro-foreland basin during the Priabonian, at the end of Pyrenean orogenesis.&#160;</p><p>Our detailed study of the&#160;tectono-stratigraphic architecture&#160;of the Corbi&#232;res&#160;Nappe demonstrates&#160;for the first time the existence of major Jurassic extensional structures&#160;linked to strong halokinetic activity. These structures&#160;were&#160;previously interpreted as compressional&#160;and Pyrenean&#160;in origin: (1) The Treilles Fault&#160;is&#160;a N110 trending,&#160;shallowly&#160;S-SW&#160;dipping fault&#160;at least 12 km long, which&#160;roots&#160;on Triassic evaporites. This normal fault with 2.8&#160;km of displacement&#160;cuts the Corbi&#232;res&#160;Nappe&#160;into two distinct structural units. A&#160;3D hangingwall&#160;dip fan&#160;associated with stratal thickening toward the fault demonstrates&#160;that&#160;this extensional fault was active during the full Jurassic and maybe during the early Cretaceous. (2) In the footwall of the Treilles Fault,&#160;the Valdria NE-SW&#160;trending&#160;fold&#160;pair&#160;was previously&#160;interpreted as a Pyrenean compressional fold.&#160;Detailed mapping of 3D thickness and geometry variations in the Jurassic series&#160;around these folds&#160;reveals&#160;NW verging syn-sedimentary folding during&#160;the Jurassic. We&#160;propose that this folding is linked to the growth of the Feuilla Keuper diapir&#160;that lies&#160;immediately to the south. The highlighting of these complex halokinetic and extensional structures of&#160;Early Jurassic&#160;to Early Cretaceous age have major implications for&#160;(1) the Pyrenean and Tethysian Mesozoic extensional systems in the eastern Pyrenees and (2)&#160;their impact as a major regional inheritance in later orogenic phases,&#160;in particular in the evolution of the Pyrenean Corbi&#232;res&#160;Nappe.</p><p>&#160;</p>" @default.
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- W3136018259 date "2020-03-23" @default.
- W3136018259 modified "2023-09-27" @default.
- W3136018259 title "Tectono-stratigraphic evidence of salt tectonics during Jurassic extension in the Corbières nappe, Eastern Pyrenees, France" @default.
- W3136018259 doi "https://doi.org/10.5194/egusphere-egu2020-6716" @default.
- W3136018259 hasPublicationYear "2020" @default.
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