FN Archimer Export Format PT J TI Moho depth and crustal thinning in the Marmara Sea region from gravity data inversion BT AF KENDE, Julia HENRY, P. BAYRAKCI, G. OZEREN, M. S. GRALL, C AS 1:1;2:1;3:2;4:3;5:4; FF 1:;2:;3:;4:;5:; C1 Aix Marseille Univ, Coll France, CEREGE, CNRS,IRD, Aix En Provence, France. Univ Southampton, Natl Oceanog Ctr, Ocean & Earth Sci, Southampton, Hants, England. Istanbul Tech Univ, Maden Fak, Istanbul, Turkey. Columbia Univ, Lamont Doherty Earth Observ, Marine Geol & Geophys, New York, NY USA. C2 UNIV AIX MARSEILLE, FRANCE UNIV SOUTHAMPTON, UK UNIV TECH ISTANBUL, TURKEY UNIV COLUMBIA, USA IF 3.482 TC 20 UR https://archimer.ifremer.fr/doc/00371/48188/48303.pdf https://archimer.ifremer.fr/doc/00371/48188/48304.pdf LA English DT Article CR MARSITECRUISE BO Pourquoi pas ? AB The free-air gravity in the Marmara Sea reveals that the low density of sedimentary basins is partly compensated in the lower crust. We compiled geophysical upper crust studies to determine the sediment basin geometries in and around the Marmara Sea and corrected the gravity signal from this upper crust geology with the Parker method. Then, assuming long wavelength anomalies in the residual gravity signal is caused by variations in the Moho topography, we inverted the residual to build the Moho topography. The result shows that the Moho is uplifted on an area greater than the Marmara Sea with a maximum crust thinning beneath the basins where the Moho is at about 25 km, 5 km above the reference depth. We then evaluated the Neogene extension by comparing the surface covered by our 3-D thinned model with the surface covered by an unthinned model with same crustal volume. Comparing this surface with areal extension rate from GPS data, we found a good compatibility indicating that the extension rate averaged over the Sea of Marmara area probably remained close to its present-day value during major changes of tectonic regime, as the incursion of the North Anatolian Fault system during the Pliocene leads to the establishment of the dominantly strike-slip present-day system. We also show that crustal extension is distributed over a wider domain in the lower crust than in the upper crust, and that this may be accounted for by a relatively minor component of lower crustal ductile flow. PY 2017 PD FEB SO Journal Of Geophysical Research-solid Earth SN 2169-9313 PU Amer Geophysical Union VL 122 IS 2 UT 000396132200032 BP 1381 EP 1401 DI 10.1002/2015JB012735 ID 48188 ER EF