Page 4 - Basin_formation_the Egadi

mentary succession. The sedimentary sequences rec- the seismic units recognized within this subbasin
ognized in the two subbasins can not be correlated impossible from one profile to the other.
across the structural high and therefore, the two
subbasins will be described separately. Line G-35 (Fig. 5) crosses the northem part of the
WS with a NE-SW trend, perpendicular to ihe axis
5. Data description and interpretation of the basin. It shows a west-dipping extensional
fault (Fl) with related half graben that bounds the
5.1. Western subbasin (WS) WS. The lower unit (A) is wedge-shaped, and reflec-
tions within it define an anticlinal structure. Within
This subbasin has a width of 10 km and a length the overlying unit (B) reflections onlap the western
of at least 30 km and its northem and southem limits flank of the previously described anticline and pre-
are outside the seismic grid. Its depth is greater than sent a wedging attitude next to the boundary fault
900 m and it is formed by two opposite verging half (Fl). The upper unit (C) is also wedge-shaped with
grabens formed by from NW-SE- to NNW-SSE- basa1 reflections onlapping the top of unit B. The
trending extensional faults (Fig. 4). Poor quality of a wedging of its interna1 reflection indicates deposition
couple of transversal profiles makes correlation of during extension along the boundary fault.

Line INVO-18 (Fig. 6) runs along the basin axis
and crosses line G-35; the same units of the previous

Fig. 4. Schematic structural map of basin INVO-2. ES = eastem subbasin; SH = siructuralhigh; WS = western subbasin.