FN Archimer Export Format
PT J
TI The Seismic Structure of the Western approaches and the South Armorican Continental Shelf and its Geological Interpretation
BT 
AF AVEDIK, F.
AS 1:;
FF 1:;
TC 0
UR https://archimer.ifremer.fr/doc/1975/publication-5465.pdf
LA English
DT Article
DE ;Histoire Ifremer
AB Based on all available seismic refraction data, the seismic structure of the Western Approaches to the English Channel and the South Armorican continental shelf has been established. The correlation of seismic velocities showed a three-fold structure, related to geological layers as follows: 1. High-velocity, deep sequence (4.4-6.6km/sec): metamorphic basement and Lower to Middle Palaeozoic. 2. Intermediate sequence (3.6-4.3km/sec): Permo-Triassic (and Jurassic?) and possibly also Lower Cretaceous on the margin of the Western Approaches. 3. Upper sequence (1.9-3.6km/sec): Cretaceous and Cenozoic sediments. An acoustic unconformity appears to be present between the Upper sequence and the High velocity and Intermediate sequences. Different geomorphology characterizes these layers: the Palaeozoic is tectonized and generally follows the Hercynian structural trends; mainly Permo-Triassic sediments fill the depressions of the Palaeozoic floor, but only in the Western Approaches; eastwards-transgressive Cretaceous and Cenozoic sediments cover discordantly the preceding layers. [NOT CONTROLLED OCR]
PY 1975
SO Petroleum and the continental shelf of North-west Europe
PU John Wiley & Sons
BP 29
EP 43
ID 5465
ER

EF