Page 9 - Maldonado_Stanley_1976

6 SMITHSONIAN CONTRIBUTIONS TO THE EARTH SCIENCES

~ (a) lynch Il cruise track
~ (b) lynch Il track,
o -4----- (c) position of major
]6 y (d) Canyon
1\ (e) Topographic High
......_ (f) Pinchout
.............._(g) Fault
~ (h) Slump
+ (i) Synclinorium
+ (i) Anticlinorium
~ (k) Offlap
A (l) Tilted Block
~(m) Basin
-.. (n) 'lnclined Surface
"""""- (o) Terrace
6-'(p) Environments (Code l -
+ (q)Uplift
o ~ (r) Faulted Margin

TUIISIA

SOUNOINGS IN FATHOMS
o~~~~~'o~o~--==~2~00Km.

Il"
FIGURE 3.-Track (dark solid line) of the USNS Lynch (cruise Il, 1972) in the Strait of Sicily
region. The dominant structural features observed on 3.5 kHz and 30,000 J sparker are depicted
(explanation in text). The specifìc topographic environments (code I to IO) are displayed on
the thin line (offset from the track line); these are defìned in the text. The scale on this Iine is
shown in kilometers (a total of about 1100 km between the Ionian slope east of the Strait and
the Algéro-Balearic Basin). The major structural trends of the Strait are also depicted (modifìed
after Burollet, 1967; Finetti and Morelli, 1972a, b; Zarudzki, 1972).

blocked by the sill and do not cross from the east- be more intense on the Tunisian margin inasmuch
ern to western Mediterranean. as the flow is thicker and less saline in this sector
The surface waters are a source of suspended than on the Sicilian side. On the other hand,
sediment in the form of pelagic tests (planktonic Levantine water flows along the sea floor and is
foraminifera, etc.) an d terrigenous fraction ( over thus an agent of transport and erosion as we shall
1.0 mgjl, according to Emelyanov and Shimkus, demonstrate in later sections (Pierce and Stanley,
I 972). The influence of this Atlantic water should 1975). Further transport is perhaps also related to