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Evolution of the Ecuador offshore nonaccretionary forearc basin and margin segmentation

Paul Bastard 1, 2, * Lindsey Rosen 3 Qian Zhang 2 Eleftherios Michailidis 2 Hans-Heinrich Hoffmann 2 Yu Zhang 3 Karim Dorgham 4 Quentin Philippot 1 Jérémie Rosain 1 Vivien Béziat 1, 2 Jérémy Manry 1 Elana Shaw 3 Liis Haljasmägi 5 Pärt Peterson 5 Lazaro Lorenzo 1 Lucy Bizien 1 Sophie Trouillet-Assant 6, 7 Kerry Dobbs 3 Adriana Almeida de Jesus 3 Alexandre Belot 7, 8, 9 Anne Kallaste 10 Emilie Catherinot 11 Yacine Tandjaoui-Lambiotte 12, 13 Jeremie Le Pen 2 Gaspard Kerner 1 Benedetta Bigio 2 Yoann Seeleuthner 1 Rui Yang 2 Alexandre Bolze 14 András Spaan 2, 15 Ottavia Delmonte 3 Michael Abers 3 Alessandro Aiuti 16, 17 Giorgio Casari 16, 17 Vito Lampasona 16, 17 Lorenzo Piemonti 16, 17 Fabio Ciceri 16, 17 Kaya Bilguvar 18 Richard Lifton 18, 2 Marc Vasse 11 David Smadja 19 Mélanie Migaud 1 Jérome Hadjadj 20 Benjamin Terrier 21, 22 Darragh Duffy 23 Lluis Quintana-Murci 24, 25 Diederik van de Beek 26 Lucie Roussel 27 Donald Vinh 27 Stuart Tangye 28, 29 Filomeen Haerynck 30 David Dalmau 31, 32 Javier Martinez-Picado 33, 34, 35 Petter Brodin 36, 37 Michel Nussenzweig 2, 38 Stéphanie Boisson-Dupuis 1, 2 Carlos Rodríguez-Gallego 39, 40 Guillaume Vogt 41 Trine Mogensen 42, 43 Andrew Oler 3 Jingwen Gu 3 Peter Burbelo 44 Jeffrey Cohen 3 Andrea Biondi 45, 46 Laura Rachele Bettini 45, 46 Mariella d'Angio 45, 46 Paolo Bonfanti 47, 45 Patrick Rossignol 48 Julien Mayaux 49 Frédéric Rieux-Laucat 20 Eystein Husebye 50, 51, 36 Francesca Fusco 52 Matilde Valeria Ursini 52 Luisa Imberti 53 Alessandra Sottini 53 Simone Paghera 53 Eugenia Quiros-Roldan 54, 53 Camillo Rossi 53 Riccardo Castagnoli 55, 56 Daniela Montagna 56, 55 Amelia Licari 55, 56 Gian Luigi Marseglia 55, 56 Xavier Duval 57, 58, 59, 60 Jade Ghosn 60, 58 John Tsang 3 Raphaela Goldbach-Mansky 3 Kai Kisand 5 Michail Lionakis 3 Anne Puel 1, 2 Shen-Ying Zhang 1, 2 Steven Holland 3 Guy Gorochov 4, 61 Emmanuelle Jouanguy 1, 2 Charles Rice 2 Aurélie Cobat 1, 2 Luigi Notarangelo 3 Laurent Abel 1 Helen Su 3 Jean-Laurent Casanova 1, 2, 38, 62, * Christelle Tual 63 Yazdan Yazdanpanah 58
* Corresponding author
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Abstract : Forearc basins have developed along accretionary and nonaccretionary convergent margins. Here, we investigate the evolution of an offshore nonaccretionary-type forearc basin that has developed along the Ecuadorian convergent margin. We used 2D-Multichannel Seismic Reflection profiles to recognize five seismic units overlying the acoustic basement. The units were dated by correlation with wells and regional stratigraphy. They recorded the structural evolution of the margin into North, Central-North and Central-South margin segments identified from Gravity Free Air Anomalies. Intersegment transition zones accommodated deformation related to the margin segmentation, contributing to the development of shelf forearc depocenters. An offshore forearc basin (subunit L1a) developed on accreted oceanic terranes during the middle-to-late Eocene. The basin was affected by normal faulting during the Oligocene to early-middle Miocene (subunit L1b). This extension stage initiated during the rifting and oblique subduction of the Farallon plate beneath the Ecuador margin. The basin underwent an early-middle Miocene uplift outlined by unconformity U1 potentially associated with the subduction of the young Nazca plate, in a less oblique plate convergence environment. During the early-Pliocene, the Central-South margin segment individualized by uplift during the formation of unconformity U2. The Manta anticline, which developed in the intersegment transition zone, accommodated the segmentation. This event is associated with the arrival of the Carnegie ridge in the subduction. The North segment individualized by uplift during the Pliocene early-Pleistocene formation of the Pedernales structural high, which may coincide with a reactivation of the Canandé fault. Synchronously, unit L3 sediment recorded the subsidence of the Central-North segment, and strike-slip tectonics in the area of the Jama-Bahía depocenter. A mosaic of middle-to-late Pleistocene unit L5 depocenters that alternate with uplifted zones along the shelf likely recorded the subduction of the topographically irregular Carnegie ridge. The study provides a remarkable example of the evolution of a non-accretionary-type forearc basin.
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Paul Bastard, Lindsey Rosen, Qian Zhang, Eleftherios Michailidis, Hans-Heinrich Hoffmann, et al.. Evolution of the Ecuador offshore nonaccretionary forearc basin and margin segmentation. Tectonophysics, Elsevier, 2020, 781, pp.228374. ⟨10.1016/j.tecto.2020.228374⟩. ⟨pasteur-02958871⟩

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