FN Archimer Export Format
PT J
TI Back‐arc dynamics controlled by slab rollback and tearing: a reappraisal of seafloor spreading and kinematic evolution of the Eastern Algero‐Balearic basin (western Mediterranean) in the Middle‐Late Miocene
BT 
AF Haidar, Shaza
   Déverchère, Jacques
   Graindorge, David
   Arab, Mohamed
   Medaouri, Mourad
   Klingelhoefer, Frauke
AS 1:1;2:1;3:1;4:2;5:2;6:3;
FF 1:;2:;3:;4:;5:;6:PDG-REM-GM-LAD;
C1 Univ Brest, CNRS, Ifremer, Geo-Ocean UMR6538, Plouzane, France
   SONATRACH, Division Exploration 3029 Boumerdes, Algeria
   Ifremer, Univ Brest, CNRS, Geo-Ocean UMR6538, Plouzane, France
C2 UBO, FRANCE
   SONATRACH, ALGERIA
   IFREMER, FRANCE
SI BREST
SE PDG-REM-GM-LAD
UM GEO-OCEAN
IN WOS Ifremer UMR
   WOS Cotutelle UMR
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
   copubli-sud
IF 4.2
TC 6
UR https://archimer.ifremer.fr/doc/00747/85886/91076.pdf
LA English
DT Article
CR SPIRAL
BO L'Atalante
DE ;back-arc spreading;western Mediterranean sea;magnetic anomalies;kinematic reconstructions;slab rollback;slab tear
AB In spite of a clear fan-shaped magnetic anomalies in the Eastern Algero-Balearic Basin (EABB), the way how and the time when seafloor spreading occurred are still debated. In this work, a new seismo-stratigraphic interpretation based on deep-penetration reflection seismic data correlated to reduced-to-the-pole magnetic anomalies and on-offshore litho-stratigraphic correlation of Pre-Messinian units bring new constraints on its age and mode of opening. Our results reveal that the seafloor spreading of the EABB occurred at an intermediate half-spreading rate of 3.7±0.5 cm/yr for 2.45±0.18 Myr during the Langhian-Serravallian times, i.e. after the Corsica-Sardinia block rotation and the collision of Lesser Kabylia with Africa. We revise the kinematics of the Algero- Balearic domain into three stages: (1) birth of a highly stretched continental basin accommodating the southern drift of the Kabylies driven by slab rollback between ∼23 and ∼15 Ma, (2) fast opening of a new EABB between 15.2 and 12.7 Ma by clockwise rotation of a Greater Alboran Block (GALB) promoted by slab tearing, (3) late East-West opening of the western basin in response to the westward retreat of the Gibraltar slab and westward slab tearing propagation and the concomitant migration of the GALB. The last stages match both the late formation of a Subduction-Transform Edge Propagator (STEP) faults at the toes of the Algero-Balearic margins and the post-collisional volcanic migration along the Algerian margin interpreted as related to slab tearing propagation. This new scenario favors a significant stretching and splitting of the GALB into several continental fragments resulting from the westward propagation of the arcuate subduction front by lateral tearing of a narrow slab. 
PY 2022
PD FEB
SO Tectonics
SN 0278-7407
PU American Geophysical Union (AGU)
VL 41
IS 2
UT 000763564800006
DI 10.1029/2021TC006877
ID 85886
ER

EF