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Radiolarian zonation and volcanic ash layers in two Quaternary sediment cores from the Central Indian Ocean Basin

DRS at CSIR-National Institute of Oceanography

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Title Radiolarian zonation and volcanic ash layers in two Quaternary sediment cores from the Central Indian Ocean Basin
 
Creator Gupta, S.M.
 
Subject Geology and Geophysics
Quaternary
volcanic ash
ecological zonation
radiolarian ooze
core analysis
sediments
palaeontology
Lamprocyrtis warreni
Lamprocyrtis heteroporos
Lamprocyrtis neopheteroporos
Lamprocyrtis nigriniae
Collosphaera orthoconus
ISW, Central Indian Ocean
 
Description Radiolarian abundance in two Quaternary sediment cores, collected from the Central Indian Basin, was studied and Nigrini's (1971) and Goll's (1980) zones are recognised. New radiolarian zones Collosphaera orthoconus, Lamprocyrtis nigriniae, Lamprocyrtis neopheteroporos and Lamprocyrtis heteroporos are proposed and described to modify Nigrini's and Goll's zonations. A hiatus of 0.2-0.3 M.Y., correspondings to Pseudocubus warrenin zone (Goll, 1980) in core F-88 B, suggest the erosion and redistribution of Pliocene taxa by a bottom water current (probably Antarctic Bottom Water Current). Volcanic ash layers of apparently about 20,000; 30,000 - 40,000; 80,000; 340,000 and younger than 4000,000 years are also recognised, which suggest suboceanic explosive volcanic eruptions during late Quaternary in the area
 
Date 1995-07-14T10:01:41Z
2017-09-30T01:29:50Z
1995-07-14T10:01:41Z
2017-09-30T01:29:50Z
1988
 
Type Journal Article
 
Identifier Journal of the Palaeontological Society of India, vol.33; 1988; 59-71
0552-9360
http://drs.nio.org/drs/handle/2264/7083
 
Language en
 
Relation J Palaeontol Soc India
 
Publisher Palaeontological Society of India