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Title: Geochemical evidence for anoxic deep water in the Arabian Sea during the last glaciation

Various paleoceanographic studies have indicated that the deep ocean was probably depleted in dissolved oxygen during the last glacial period ([approximately]18 kyr B.P.; [delta][sup 18]O, stage 2) compared to present time. However, direct evidence of low oxygen content in the deep waters has been lacking. Here, the authors report geochemical evidence of near anoxic conditions in the deep Arabian Sea during the entire last glacial cycle ([delta][sup 18]O; stages 2, 3, and 4). Anoxia is inferred from the concomitant enrichment of organic carbon and authigenic uranium in the glacial sections of a core from the deep eastern Arabian Sea. The anoxic conditions during the last glacial period, probably caused by a change in deep water circulation, evidently enhanced preservation of organic matter and simultaneous removal of uranium from seawater. 57 refs., 3 figs., 2 tabs.
Authors:
; ;  [1]
  1. (Physical Research Lab., Ahmedabad (India))
Publication Date:
OSTI Identifier:
6575212
Resource Type:
Journal Article
Resource Relation:
Journal Name: Geochimica et Cosmochimica Acta; (United States); Journal Volume: 57:5
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ARABIAN SEA; ANOXIA; PLEISTOCENE EPOCH; OCEANOGRAPHY; CARBON; ENRICHMENT; ORGANIC MATTER; OXYGEN; PRESERVATION; REMOVAL; SEAWATER; URANIUM; WATER; ACTINIDES; CENOZOIC ERA; ELEMENTS; GEOLOGIC AGES; HYDROGEN COMPOUNDS; INDIAN OCEAN; MATTER; METALS; NONMETALS; OXYGEN COMPOUNDS; QUATERNARY PERIOD; SEAS; SURFACE WATERS 540310* -- Environment, Aquatic-- Basic Studies-- (1990-)