FN Archimer Export Format
PT J
TI Controls on the seafloor exposure of detachment fault surfaces
BT 
AF Olive, Jean-Arthur
   Parnell-Turner, Ross
   Escartín, Javier
   Smith, Deborah K.
   Petersen, Sven
AS 1:1;2:2,3;3:4;4:5;5:6;
FF 1:;2:;3:;4:;5:;
C1 Laboratoire de Géologie, Ecole Normale Supérieure / CNRS UMR 8538, PSL Research University, 24 rue Lhomond, 75005, Paris, France
   Woods Hole Oceanographic Institution, 266 Woods Hole Rd., Woods Hole, MA, 02543, USA
   Scripps Institution of Oceanography, Institute of Geophysics and Planetary Physics, University of California, San Diego, La Jolla, CA 92093, USA
   Institut de Physique du Globe de Paris – CNRS UMR 7154, 1 rue Jussieu, 75005, Paris, France
   National Science Foundation, 2415 Eisenhower Ave., Alexandria, VA, 22314, USA
   GEOMAR / Helmholtz Centre for Ocean Research, Wischhofstrasse 1-3, 24148, Kiel, Germany
C2 ENS, FRANCE
   WHOI, USA
   UNIV CALIF SAN DIEGO, USA
   IPGP, FRANCE
   NATL SCI FDN, USA
   GEOMAR HELMHOLTZ CTR OCEAN RES, GERMANY
IF 4.823
TC 12
UR https://archimer.ifremer.fr/doc/00469/58106/85190.pdf
LA English
DT Article
CR ODEMAR
BO Pourquoi pas ?
DE ;mid-ocean ridge;detachment faulting;oceanic core complex;critical taper;fault friction
AB While oceanic detachment faults have been proposed to account for the accretion of ∼40% of new seafloor in the North Atlantic ocean, clear exposures of large-offset, often-corrugated fault surfaces remain scarce and spatially limited. To help resolve this paradox, we examine the conditions under which detachment fault growth may or may not lead to extensive exposure of corrugated fault planes at the seafloor. Using high-resolution bathymetry from four detachment faults at the northern Mid-Atlantic Ridge, we investigate the rafting of hanging wall-derived debris over emerging fault scarps, which can lead to covering shallow-dipping corrugated fault surfaces. We model this process using critical taper theory, and infer low effective friction coefficients (∼0.2) on the shallowest portion of detachment faults. A corollary to this result is that detachments emerging from the seafloor at angles <13° are more likely to become blanketed under an apron of hanging wall material. We generalize these findings as a simple model for the progressive exposure and flexural rotation of detachment footwalls, which accounts for the continued action of seafloor-shaping processes. Our model suggests that many moderate-offset, hidden detachment faults may exist along slow mid-ocean ridges, and do not feature an exposed fault surface.   
PY 2019
PD JAN
SO Earth And Planetary Science Letters
SN 0012-821X
PU Elsevier BV
VL 506
UT 000455693800036
BP 381
EP 387
DI 10.1016/j.epsl.2018.11.001
ID 58106
ER

EF