5.5 Erosion and Rede[!osition of Dee[!-Sea Sediments
b
CROS S
SECT ION
5 km
I WATER
DEPTH
MESSINA RIDG E
Fig. 5.23. Sediment drifts and contourites. a-d Compiex sediment buildup of Iower siope and rise sediments, including sediment drifts, on North American
continental margin off Washington D.C. (Modified
from Locker and Laine 1992). e Seismic facies of
sediment drifts on the Messina Ridge, MediterraI
a
~l
100 km
I
S
e
BARENTS SEA
LAYERED MUD ,
IRREGULAR SIL T-RICH
AND SILT -DEPLETED
MUD LAYERS , SOME
BIOTURBATION
(CONTOURITEI
HEMIPE LAGIC MUD,
BIOTURBA TED
- THIN -BEDDED MUD
WITH ICE-RAFTED
MUD CLASTS AND
ROCK FRAGMENTS
SIL T-CLAY COUPLE TS
(MUD TURBIDI TES I
HEMIPELAG IC MUD ,
BIOTURBATED
INDISTINCTL Y LAYERED
MUD , ± BIDTURBATED
(CONTOURITE )
INDISTl NCTL Y LAYERED
MUD, ± BIOTURBATED
(CDNTOURITEI
f
WEDDELL SEA
CROSS-STRATI FIED
SILT AND CLAY
(CONTOURITEI
HEM IPELAGIC CLAY
WITH ICE-RAFTED
DEBRIS,
± BIOTURBATED
. _ . _ . _ . _ ._~ . ' _ . " .. " ~ _I--- SIL T AND CLAY ,
.. .. .. . -_ . .. .. . .
. .. .. .. .. . - . . -. -
.. .. , . .. .. .. .. . .
LAMINATED
(CON TOURITE I
237
nean. (Modified from Marani et al. 1993). f Core
section with contourites, base of siope, Barents Sea.
(Modified from Yoon and Chough 1993). g Core
section with contourites, Weddell Sea, Antarctica.
(Modified from Weber et al. 1994)