FN Archimer Export Format
PT J
TI New Magnetic compilation and interpretation of the Bay of Biscay and surrounding continental shelves
BT 
AF Le Maire, Pauline
   Thinon, Isabelle
   Tugend, Julie
   Issautier, Benoît
   Martelet, Guillaume
   Paquet, Fabien
   Proust, Jean-Noël
   Nalpas, Thierry
   Peyrefitte, Aurélie
   Canva, Albane
AS 1:1;2:1;3:2,3;4:1;5:1;6:1;7:4;8:4;9:1;10:5;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;
C1 BRGM-French Geological Survey, Orléans, France
   Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre Paris, ISTeP UMR 7193, F-75005 Paris, France
   CY Cergy Paris Université, GEC, F-95000 Cergy, France
   Géosciences, Rennes, France
   Géoazur CS 34229, Nice, France
C2 BRGM, FRANCE
   UNIV SORBONNE, FRANCE
   UNIV CY CERGY PARIS, FRANCE
   UNIV RENNES, FRANCE
   UNIV NICE, FRANCE
IF 3.192
TC 3
UR https://archimer.ifremer.fr/doc/00855/96735/105280.pdf
   https://archimer.ifremer.fr/doc/00855/96735/105281.zip
LA English
DT Article
CR GIROPAL18
   SYRRE
   ZEE GASCOGNE
   ZEEGASC2
BO Antea
   Côtes De La Manche
   L'Atalante
DE ;magnetic compilation;aeromagnetic data;marine magnetic data;Bay of Biscay;passive margin segmentation;Ocean-Continent-Transition (OCT)
AB Producing accurate structural maps is a pre-requisite to unravel the tectonic evolution of a region. For this purpose, magnetic anomaly maps are helpful data sets for the identification and mapping of geological features. We compiled 154 marine surveys and 7 aeromagnetic campaigns covering the Bay of Biscay, its surrounding continental shelves and western part of the Pyrenees. As the initial data sets had heterogeneous acquisition parameters, we applied a series of transforms before merging the data. We performed a variable reduction to the pole to localize the extrema of the anomaly vertically to their causative sources and facilitate geological interpretations. The resulting intermediate resolution maps compiled at 500 m altitude offshore and 3000 m both on- and offshore, display magnetic trends and patterns. They are enhanced by several potential field operators (analytic signal, tilt angle, vertical derivative) enabling the interpretation of the geometry of the sources causing the anomaly (3D, 2D and 2.5D). The analysis of these magnetic maps allows us to precise the distribution and segmentation of crustal domains previously identified in the Bay of Biscay and its adjacent continental shelves. A series of crustal scale structures mapped onshore and formed during and after the Variscan orogeny show well on this new map compilation, allowing the continuous onshore-offshore mapping of some of them and revealing their role in segmenting the northern margin of the Bay of Biscay. This new compilation notably reveals variations in the magnetic signature of the Ocean-Continent-Transition (OCT) that we interpret as related to an increased magmatic production of the eastern part of the Bay of Biscay OCT during continental breakup. In addition to precise previous structural maps, this new magnetic compilation opens new perspectives for the interpretation of the Bay of Biscay geodynamic setting. 
PY 2021
PD NOV
SO Bsgf-earth Sciences Bulletin
SN 0037-9409
PU EDP Sciences
VL 192
IS 58
UT 000720522500001
DI 10.1051/bsgf/2021048
ID 96735
ER

EF