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- Title
Residual Sediments of the Vema Fracture Zone, Central Atlantic.
- Authors
Chamov, N. P.; Sokolov, S. Yu.; Merenkova, S. I.
- Abstract
The Vema Fracture Zone orthogonally intersecting the Mid-Atlantic Ridge along 11° N is a complex tectono-sedimentary system, through which bottom water is transferred from the western to the eastern Atlantic. The southern surrounding of the fault valley is an extended (about 320 km) transverse ridge. At the early stages of the Vema System evolution, the ridge was located at shallow depths in the photosynthesis zone, which led to the formation of extensive biogenic carbonate buildups on its surface. Spreading, general sinking of the system, and associated movements along faults caused disintegration of ultramafic basement and bioherms with subsequent fractionation of colluvial–pelagic sediments and their eastward transport by bottom currents. The formation of coarse-grained residual sands completely devoid of pelitic material is associated with the high flow rates of Antarctic bottom waters. The presence of rounded pebbles of organogenic limestones and ultramafic rocks with traces of bioproductivity indicates that clastic material was transferred over a few hundred kilometers.
- Subjects
MID-Atlantic Ridge; LIMESTONE; SEDIMENTS; SEDIMENT transport; BIOHERMS; WATER transfer; ZONING
- Publication
Lithology & Mineral Resources, 2020, Vol 55, Issue 5, p338
- ISSN
0024-4902
- Publication type
Article
- DOI
10.1134/S0024490220050028