Abstract
This paper presents a record of radiolarian species from the sections (1H1-1H2) Leg 119 Site 738B of Southern Ocean region. Well diversified taxa of typical Antarctic assemblage are present in the sections. Thirty species were identified and illustrated from twenty-nine samples. On the basis of appearance, disappearance and abundance of taxa, viz. Omega and Psi zones are established and systematics of stratigraphically important species is described. These zones are equivalent to NR1 and NR2 of Upper Quaternary.
Highlights
The study area lies in the southern part of Kerguelen Plateau at latitude 62 ̊42.54'S and longitude 82 ̊47.25'E (Figure 1)
The Leg 119 site 738B consists of nanno fossil ooze, calcareous chalk and limestone. [1] began the study on radiolarian bearing sediments in the Southern Ocean and described twenty species from the Antarctic sector of the Indian Ocean. [2] reported some species of radiolaria from Indian Ocean sector of Antarctica. [3] studied the radiolaria from the Wilhelm II Coast of Antarctica and Kerguelen Island. [4] worked on the B.A.N.Z
P. c trilobum is present in the samples 738B-1H2, 135 - 137 at a depth of 2.85 mbsf occurs as very rare, while S. universus continuosly shows its presence throughout the sections. [14] considered A. cylindrica as a better marker within this stratigraphic interval and occur as few to common
Summary
The study area lies in the southern part of Kerguelen Plateau at latitude 62 ̊42.54'S and longitude 82 ̊47.25'E (Figure 1). [4] worked on the B.A.N.Z. Antarctic Research Expedition and collected sediment samples to carry out detail study on radiolaria. [23] proposed radiolarian biostratigraphy of late Tertiary Antarctic Seas of the Southern Ocean Region. [34] established Pliocene-Pleistocene radiolarian biostratigraphy and paleoclimatic history from the samples collected near the Antarctic and subtropical convergence of the Southern Ocean region. [43] carried out detail study on Neogene radiolaria from ODP Legs 119 and 120. [45] reported Antarctic Neogene radiolaria from ODP Leg 119 and described environmental control of radiolarian diversity, evolutionary rates and taxa longevities. [50,51] described 71 radiolarian species and established one radiolarian zone i.e. lower and upper Chi from the Pleistocene sediments of South East Indian area of the Antarctic continental margin. Ity variation from the ODP Site 1084 in late Pleistocene. [50,51] described 71 radiolarian species and established one radiolarian zone i.e. lower and upper Chi from the Pleistocene sediments of South East Indian area of the Antarctic continental margin. [52,53] described 45 radiolarian species and proposed the placement of NR1 and NR2 zonal boundary at a shallow depth of 6.63 mbsf from Southern Ocean region
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