Dense biological communities at 3850 m on the Laurentian Fan and their relationship to the deposits of the 1929 Grand Banks earthquake
Abstract
During Alvin dives on the Laurentian Fan aimed at exploring the nature of the deposit of the 1929 Grand Banks earthquake and turbidity current, large, dense communities of living vesicomyid and thyasirid clams, gastropods, and other epifaunal taxa similar to those found in hydrothermal and cold seep environments were unexpectedly discovered. The communities are at 3800–3900 m in a passive margin setting, with no apparent mechanism for enhanced fluid flow. The communities occur near the crests of ‘gravel waves’, depositional bedforms created during the passage of the turbidity current, and on the slope and crest of a steep (20–30°) scarp of outcropping valley floor material. We speculate that these communities have established themselves since 1929 and that they are sustained by chemosynthetic processes. The reduced compounds fueling the chemosynthesis presumably are derived from older, organic-rich fan valley floor sediments that were exposed by the 1929 event.
Department
Center for Coastal and Ocean Mapping Affiliate
Publication Date
8-1988
Publisher
Elsevier
Journal Title
Deep Sea Research Part I: Oceanographic Research Papers
Digital Object Identifier (DOI)
10.1016/0198-0149(88)90079-9
Document Type
Article
Recommended Citation
L.A. Mayer, A.N. Shor, J. Hughes Clarke, D.J.W. Piper, Dense biological communities at 3850 m on the Laurentian Fan and their relationship to the deposits of the 1929 Grand Banks earthquake, Deep Sea Research Part A. Oceanographic Research Papers, Volume 35, Issue 8, August 1988, Pages 1235-1246, ISSN 0198-0149, http://dx.doi.org/10.1016/0198-0149(88)90079-9.
Rights
Copyright © 1988 Published by Elsevier Ltd.