Late Neogene radiolarian assemblages characteristic of Indo-Pacific areas of upwelling

Comparison of radiolarian faunas in Late Neogene sediments from the Peru margin, the Oman margin and from beneath the Somalian gyres allowed definition of an assemblage characteristic of areas of upwelling. We describe the stratigraphic and geographic ranges of 12 previously studied and 10 new or ne...

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Bibliographic Details
Published in:Micropaleontology 1992, Vol.38 (2), p.139-164
Main Authors: Nigrini, Catherine, Caulet, Jean Pierre
Format: Article
Language:English
Subjects:
Abdomen
assemblages
biostratigraphy
Cenozoic
identification
Indian Ocean
Invertebrata
Leg 112
Leg 117
Marine
microfossils
Micropaleontology
Neogene
Ocean currents
Ocean Drilling Program
Oceans
ODP Site 682
ODP Site 683
ODP Site 685
ODP Site 688
ODP Site 721
ODP Site 722
Pacific Ocean
Paratypes
Protista
Radiolaria
Sediments
Stratigraphy
Strictures
Taxa
Tertiary
Thorax
upper Neogene
upwelling
Upwelling water
zoning
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Summary:Comparison of radiolarian faunas in Late Neogene sediments from the Peru margin, the Oman margin and from beneath the Somalian gyres allowed definition of an assemblage characteristic of areas of upwelling. We describe the stratigraphic and geographic ranges of 12 previously studied and 10 new or newly described taxa. These forms fall into 3 categories: (1) endemic upwelling (14 species); (2) displaced temperate (3 species); and (3) enhanced tropical (5 species). Not all elements of the assemblage are present, or in like abundances, in each upwelling area studied, but there is sufficient matching to allow identification of the assemblage. Eight long ranging species exhibit diachronous first appearances up to 7 my older in the Oman material than in the Peru material.
ISSN:0026-2803
1937-2795
DOI:10.2307/1485992