Popping rocks and lava tubes from the Mid-Atlantic rift valley at 36° N

Type Article
Date 1973
Language English
Author(s) Hekinian Roger, Chaigneau M., Cheminee J.L.
Source Nature (Nature), 1973 , Vol. 245 , N. 5425 , P. 371-373
Mot-Clé(s) Histoire Ifremer
Abstract During the 1972 Midlante* cruise of the RV Jean Charcot to survey a limited area of the rift valley south of the Azores, a dredge (CH-DR11) was taken at a depth of 1,360 fathoms in a depression near the foot of the eastern wall at latitude 36° 49.3' N and longitude 33° 15' W. Two types of rocks were recognized from their structure and their degree of weathering. One type is "slab-like" rock, 2 to 13 cm in diameter and 1 to 2 cm thick (Fig. la and b). The other type of rock consists of oval glassy pebbles (1 to 5 cm in diameter, Fig. 1c) which were observed to jump and explode, one or two at a time, for 3 d after the dredge haul was emptied on to the deck of the ship. [NOT CONTROLLED OCR]
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Hekinian Roger, Chaigneau M., Cheminee J.L. (1973). Popping rocks and lava tubes from the Mid-Atlantic rift valley at 36° N. Nature, 245(5425), 371-373. Open Access version : https://archimer.ifremer.fr/doc/00000/5155/