Geology Reference
In-Depth Information
Fig. 2.12.
-
A
: Actinians, sponges and gorgonians settling on a non-active black smocker. Yellowish color of substrate is
caused by iron-sulfur compounds. East-Pacific ridge, 2300 m water depth.
B
: Abundant white deep-sea mussels (Vesicomyidae) and
Neolepas
sp
.
together with shrimps (
Alvinocaris
) and gastropods
(
Phymorhyncus
) living on a H
2
S rich crater floor with a slight content of methane. Hydrothermal activity changed the
sediment which now contains amorphic iron-monoxyd and pyrite. Edison sea-mount (Bismarck Sea, Papua-New Guinea),
1450 m water depth.
C
: A dying community of deep-sea mussles (Vesicomyidae) in the crater of the Edison sea-mount. Many carrion-feeding
gastropods (
Phymothyncus
) thrive on the distinct double valves. Same locality as 2.
D
: Fresh pillow lava with some echinoderms (Brisingidae). East-Pacific ridge, 2400 m depth.
All photographs courtesy of Forschungsinstitut Senckenberg, Frankfurt/Main.
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Further reading:
K211
