Page 40 - Tesi_dottorato_Polizzi_Sabrina

ABYSSAL SHEET DRIFT: mostly aggradation

transparent to wavy reflections - - - f- ~~- -

Ex: Gloria drift, JJ n>7Jh;;>nn >"?"17 I/77?/J/7/ nJ77
Argentine Basin drifts
substratum of the drift
Plastered drift low current
speed gradient
-alongslope migration
(downstream of the current flow) gentle slope

-down and upslope 2000m
migration
\ \\\\l](rrrrrrr
(/) Ex: Gardar drift

1u.-.
oii:
ow
~ Detached drift

C)

oz - predominant downslope

.w..1 migration

1z-

a~
Ex: Eirik drift

Separated drift moat channel high current
speed gradient
- alongslope migration steep slope
(downstream of the current with a
flow) slope break

-upslope migration

Ex: Faro drift

(/)

1- -predominant downcurrent
IL. migration
-limited lateral migration
oii:
....Cf) ozw Ex: Sumba drift
LL. u::
-predominant downcurrent in between high tectonic or volcanic reliefs
co:: oz m igration

(.) -random lateral migration

ccw ow Ex: Verna contouritic fan channel channel channel
z::>
o:::! 1-
<(

...J

W (f)
O:: l-
downstream of a deep channel issue
.zw.•.IOJLe::-.:
z
<(

::r
(.)

Figura 5.10 - Differenti tipi di drift conturitici, mostranti le geometrie e i trend di migrazioni-aggradazione, (McCave
and Tucholke, 1986; Faugeres et al., 1993a,b).

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