Origin and propagation of sedimentary sequences throughout the Escanilla fluvial routing system (South Pyrenean foreland basin)

Luis Valero, Elisabet Beamud, Miguel Garcés, Andreu Vinyoles, Nikhil Sharma, Stephen E. Watkins, Maxime Tremblin, Cai Puigdefábregas, François Guillocheau, Alex C. Whittaker, Miguel López-Blanco, Pau Arbués and Sébastien Castelltort

During middle Eocene, the Escanilla fluvial system transported and deposited material from East to West in the southern Pyrenees foreland basin. Atlantic Ocean The paleogeography and sedimentology of the source to sink system is well established. The temporal framework is made of scattered low PYRENEES resolution magnetostratigraphies, and a robust temporal framework in the most distal (Olson) and Study area most proximal (Sis) parts of the system. We built a Mediterranean Sea new high resolution magnetostratigraphy from the middle part of the system, the Lascuarre section. The correlation of Lascuarre with the high resolution magnetostratigraphies and the NASA integration of these data with other available chronological constraints results into a robust complete temporal framework from source to sink.

1 15 0W 0 50 0W 1 15 0W 0 50 0 E

0 25 0W

0 0 0 San Juan de la Peña Atarés 42 30 0 N Boltaña L’ Ainsa SISP ALEOVALLEY

Arguis Belsué Boltaña Roda de Isábena high Mediano SIERRAS Olson High Arén Oligocene / Upper Campodarbe EXTERIORES Lascuarre Viacamp Mid-upper Eocene Escanilla / Lower Campodarbe Tremp Sediment Routing system fairway MONTSEC

Sediment profile during the base of C18n.2n Sis / Pobla Yebra Belsué Olsón Lascuarre Sea level Arguís Aragón Boltaña Mediano Source Area Basin anticline anticline subsidence subsidence uplift uplift 50 km uplift subsidence

Lascuarre Magnetostratigraphy Castesillo Declination (º) Inclination (º) VGP (β) of the Lascuarre section

A magnetostratigraphy in the Lascuarre section allows recognizing a primary polarity reversals pattern which allows a high resolution correlation with the Geological Polarity Time Scale.

Bco. de la Plana Bco. de la Ribera Lascuarre 0 0 Tectonics Tectonics Corrected Uncorrected

270 90

180 180

N Ns S mDec mInc R k á95 A95max ÄDx ë Reversed 86 86 44.1 177.9 -16.6 59.1 3.2 10.4 5 9.1 -8.5 Mean ∆Dx Normal 79 79 47.8 352.4 46.7 56.8 3.5 10 5.2 12 28 sandstone Confidence . 83 83 44.9 176.2 -11.5 57.1 3.2 10.5 5.1 9.4 -5.8 marl ate se

R. (notc) se lute very f fine medium coar .coar N. (notc) 81 81 48.1 352.9 38.6 58.1 3.5 9.9 5.1 11 22 v Microcongl. Conglomer limestone 90 180 270 360 90 -90 -45 0 45 90 -90 -45 0 45 90

Cyclostratigraphy in the Escanilla system

MTM Power (black), Robust AR1 fit (red), smoothed (green) 1 3 5 7 9 11 13 15 17 1921 23 25 27 29 31 2 4 6 8 10 12 14 16 18 20 2224 26 28 30

Sedimentological analyses of the Lascuarre 0.12

section allow recognizing a set of sedimentary 0.10

sequences throughout the record. Here we 0.08

present the first results of such analyses. we wer o 0.06 are particularly interested into elucidating the P role of tectonics in relation to subsidence 0.04

distribution patterns, and also the distinct 0.02

expression of climate. variations along the 0.00 routing system. 0.0 0.2 0.4 0.6 0.8 1.0 Frequency

(b) EHA: Normalized Amplitude (unity) Location 0.0

An article in preparation will show 0.1 further details in the identification and exploration of the signal propagation 0.2 Frequency mechanisms of both particular climate aberrations and also of quasi-regular 0.3 orbital variations along the routing system. 0.4

0.5 0.0 0.2 0.4 0.6 0.8 1.0