Paleoproductivity of the Indian Ocean during the Tertiary Period

Author(s): Siesser, William G.
Author Affiliation(s): Primary:
Vanderbilt University, Nashville, TN, United States
Volume Title: Global and Planetary Change
Source: Global and Planetary Change, 11(1-2), p.71-88. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0921-8181
Note: In English. 110 refs.; illus.
Summary: Studies of oceanic paleoproductivity have lagged in part because of the absence of a suitable proxy for measuring paleoproductivity. A transfer function has recently been proposed which directly translates carbonate mass accumulation rates into a quantitative measure of productivity. This transfer function has been applied at six ODP sites in the Indian Ocean in order to investigate temporal and spatial changes in Indian Ocean productivity during the Tertiary Period. Early Paleogene productivity in the Indian Ocean was considerably higher than in the late Paleogene and Neogene. A warmer, more confined sea, with large riverine nutrient input from close lying land masses may account for the generally higher early Paleogene productivity. Productivity increased dramatically at two times during the Paleogene: during early Paleocene calcareous nannofossil Zone NP5 and during early Eocene Zone NP11. These productivity increases may be related to abrupt climatic changes which reorganized oceanic circulation and stimulated major changes in productivity. Productivity began to fall in the Oligocene as a result of global cooling and the initiation of the modern Indian Ocean circulation system. This trend continued into the Neogene, which was characterized by generally low productivity, interspersed with occasionally higher levels, especially at the more northern sites in the Indian Ocean.
Year of Publication: 1995
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Cenozoic; Indian Ocean; Interpretation; Leg 115; Leg 120; Leg 121; Leg 122; Microfossils; Nannofossils; ODP Site 709; ODP Site 748; ODP Site 752; ODP Site 757; ODP Site 758; ODP Site 762; Ocean Drilling Program; Ocean circulation; Paleo-oceanography; Paleoclimatology; Paleoecology; Plankton; Plantae; Productivity; Tertiary; Thallophytes
Coordinates: S131002 N050454 E0734953 E0590100
S584302 S544838 E0811426 E0762427
S310148 N052304 E0933525 E0873548
S203512 S163357 E1153337 E1121231
Record ID: 1995050961
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands