FN Archimer Export Format
PT J
TI Acquisition of detrital magnetization in four turbidites
BT 
AF TANTY, Cyrielle
   VALET, Jean-Pierre
   CARLUT, Julie
   BASSINOT, Franck
   ZARAGOSI, Sebastien
AS 1:1;2:1;3:1;4:2;5:3;
FF 1:;2:;3:;4:;5:;
C1 Univ Paris Diderot, Sorbonne Paris Cite, Inst Phys Globe Paris, UMR CNRS 7154, Paris, France.
   Domaine CNRS, Lab Sci Climat & Environm CEA CNRS UVSQ, Ave Terrasse, Gif Sur Yvette, France.
   Univ Bordeaux 1, Dept Geol & Oceanog, UMR EPOC 5805, Talence, France.
C2 UNIV PARIS 7 DIDEROT, FRANCE
   CNRS, FRANCE
   UNIV BORDEAUX, FRANCE
IF 3.201
TC 10
UR https://archimer.ifremer.fr/doc/00421/53226/54792.pdf
   https://archimer.ifremer.fr/doc/00421/53226/54793.pdf
   https://archimer.ifremer.fr/doc/00421/53226/54794.pdf
   https://archimer.ifremer.fr/doc/00421/53226/54795.pdf
   https://archimer.ifremer.fr/doc/00421/53226/54796.pdf
   https://archimer.ifremer.fr/doc/00421/53226/54797.pdf
LA English
DT Article
CR IMAGES 4-MD111
   MD 124 / GEOSCIENCES 2
   MD 191 / MONOPOL
BO Marion Dufresne
DE ;detrital remanence;turbidite;sediment;rock magnetism;magnetization
AB Turbiditic events are mostly avoided in paleomagnetic studies and therefore their remanence and magnetic properties are poorly described. Turbidites are exempt of bioturbation and potentially provide pertinent information about depositional remanence. We studied four quaternary turbidites of different origins in marine sediment cores. Upward fining of both magnetic and sedimentary fractions indicates that coarser grains reached the bottom first. We observe a progressive shallowing of the magnetic inclinations between the upper and bottom layers of the turbidites that increases with the size of the events and obeys a simple linear scaling law. Measurements of magnetic anisotropy suggest that hydrodynamic conditions prevailing during deposition seem to be dominant for the alignment of the magnetic grains. We suggest that small spherical grains are randomly oriented with zero resultant magnetization in presence of strong turbulent conditions, while the alignment of elongated grains is constrained by the competition between gravity and magnetic forces. A possible scenario is that under turbulent conditions they tend to rest at the bottom with their long axes parallel to the sediment surface and therefore with shallow inclinations, whereas weakly turbulent conditions like during the smallest (26 cm thick) event do not disturb the magnetic alignment and therefore do not generate inclination shallowing. 
PY 2016
PD AUG
SO Geochemistry Geophysics Geosystems
SN 1525-2027
PU Amer Geophysical Union
VL 17
IS 8
UT 000384808200014
BP 3207
EP 3223
DI 10.1002/2016GC006378
ID 53226
ER

EF