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Sarkar, Ashish
- Paleoceanographic Implications of Planktonic Foraminiferal Abundance at DSDP Sites 219,220 and 241 - An Approach Based on Paleontologic Time Series
Abstract Views :179 |
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Authors
Affiliations
1 Department of Geology and Geophysics, IIT, Kharagpur - 721302, IN
1 Department of Geology and Geophysics, IIT, Kharagpur - 721302, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 41, No 5 (1993), Pagination: 397-416Abstract
Paleontologic Time Series (PTS) analysis in both time and frequency domains on eight series of abundance data of Globorotalia menardii and total planktonic foraminifera from top core sections of DSDP Sites 219, 220 and 241 of Northern Indian Ocean depict cyclic variation presumably due to fluctuations in the Pleistocene paleo-temperature. At these sites, the relative dominance of planktonic foraminifera and G. menardii, uniform effect of post-mortem transport on foraminiferal tests of different sizes and differential sediment accumulation rate are revealed from the nature of energy distribution in the spectra, identical nature of major peaks and varying cycle lengths respectively.Keywords
Paleontologic Time Series (PTS), Deep Sea Drilling Project (DSDP), Pleistocene, Planktonic Foraminifera.- Diversity of Planktonic Foraminiferal Assemblages From Quaternary Sequences at DSDP Sites 219, 220 and 241 in Northern Indian Ocean
Abstract Views :174 |
PDF Views:3
Authors
Affiliations
1 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur-721302, IN
1 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur-721302, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 49, No 2 (1997), Pagination: 169-178Abstract
The Quaternary planktonic foraminiferal assemblages from DSDP Sites 219,220 and 241 in Northern Indian Ocean have been analysed in terms of diversity changes along the depth of each core. For an understanding of the population dynamics in the region and its relation to the paleoclimatic events (Ericson zones), relative abundance at family and species levels have been studied. Different indices of diversity viz., S, D, Hand E have been worked out and correlated with that of the oscillation in paleoclimatic record, which is based on the fluctuation in abundance of Globorotalia menardii along the depth of the core. It has been noted that during the Quaternary, relative abundance of different species and changes in diversity indices match well with that of the Ericson paleoclimatic zonation, enabling recognition of different stages of glacial and interglacial episodes in Northern Indian Ocean.Keywords
Palaeontology, Foraminifera, Palaeoclimate, Quaternary, Northern Indian Ocean.- Bearing of Last Glacial Maxima (LGM) on Sediment Accumulation in Parts of Arabian Sea
Abstract Views :177 |
PDF Views:105
Authors
Affiliations
1 School of Petroleum Technology, Pandit Deendayal Petroleum University, Gandhinagar 382 007, IN
1 School of Petroleum Technology, Pandit Deendayal Petroleum University, Gandhinagar 382 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 77, No 1 (2011), Pagination: 98-99Abstract
No Abstract.