The benthic foraminiferal faunas of Sites 725, 726, and 728 (Oman Margin, northwestern Arabian Sea).
Source
Proc., scientific results, ODP, Leg 117, Oman Margin/Neogene package. p. 55-87
Author
Hermelin, J. Otto R.
Publisher
ODP, Texas A&M University, College Station.
English abstract
The relative abundances of benthic foraminifers from the Oman margin have been analyzed from ODP Sites 725 and 726 near the upper boundary of the oxygen-minimum zone (OMZ) and 728 near the lower boundary. The relative abundance pattern of the benthic foraminiferal species in the two shallow sites show synchronous changes, which, together with variations in the faunal composition, may be attributed to changes in the location of the upper boundary of the OMZ during the last 7 million years. At the deeper site, the relative abundance pattern shows considerable variation in the faunal composition during the last 8 million years. The strong dominance of the shallow-water species Ammonia beccarii during the early Pliocene at Site 728 suggests a water depth less than 400 m during the early Pliocene and subsequent subsidence during the middle and late Pliocene to the present >1400 m water depth.
Identifier
DOI: 10.2973/odp.proc.sr.117.130.1991
