Indian contributions to marine micropaleontology (2010-2015)

Online Access: Get full text
doi: 10.16943/ptinsa/2016/48475
Author(s): Singh, Arun Deo; Divakar Naidu, P.; Saraswat, Rajeev
Author Affiliation(s): Primary:
Banaras Hindu University, Centre of Advanced Study in Geology, Varanasi, India
National Institute of Oceanography, India
Volume Title: Glimpses of geoscience research in India; the Indian report to IUGS 2012-2016
Volume Author(s): Singhvi, Ashok Kumar, editor; Banerjee, Dhiraj Mohan; Gupta, Somnath Das; Mohan, Rahul; Chandrasekharan, P.; Ahmad, Talat; Bajpai, Sunil; Raju, S.; Srinagesh, D.
Source: Glimpses of geoscience research in India; the Indian report to IUGS 2012-2016, edited by Ashok Kumar Singhvi, Dhiraj Mohan Banerjee, Somnath Das Gupta, Rahul Mohan, P. Chandrasekharan, Talat Ahmad, Sunil Bajpai, S. Raju and D. Srinagesh. Proceedings of the Indian National Science Academy, 82(3), p.663-673. Publisher: Indian National Science Academy, New Delhi, India. ISSN: 0370-0046
Note: In English. 69 refs.
Summary: An overview of the research contributions made during the last five years by the Indian scientists in the field of marine micropaleontology is presented. Large scale micropaleontological studies employing assemblages of various microfossil groups (mainly foraminifera, pteropods, ostracodes and nannoplanktons) and their geochemical proxies have been carried out on deep sea sediment cores from the Indian Ocean. These integrated studies provided better insights to our understanding of past changes in surface and deep ocean circulations on different time scales and their relationships to seasonal variations of monsoon climate. It was observed that the foraminifcral abundances and diversity in the Arabian Sea are mainly driven by the variation in monsoonal intensity. Within the present day oxygen minimum zone (OMZ), benthic diversity increased during the cold stadials when the monsoon circulation was weak, the productivity was low resulting to a weak OMZ. The enhanced inflow of Antarctic Intermediate Water (AAIW) ventilated the deep water column during this period. In the southern Bay of Bengal, the contribution of southern ocean deep water increased during the last glacial maximum, as compared to the Holocene with greater influence of North Atlantic Deep Water (NADW). For the first time boron isotope based pCO2 of seawater was reconstructed from the eastern Arabian Sea. The results obtained have major implications in understanding the effect of monsoon on the efficiency of carbon pump in geological records. Numerous studies have reconstructed the variability of the Indian monsoon by using several parameters suggest a significant spatial variability of the Indian monsoon rainfall triggered by natural and anthropogenic perturbations over different time scales.
Year of Publication: 2016
Research Program: IODP Integrated Ocean Drilling Program
IODP2 International Ocean Discovery Program
ODP Ocean Drilling Program
Key Words: 08 Paleontology, General; 12 Stratigraphy, Historical Geology and Paleoecology; Antarctic Intermediate Water; Arabian Sea; Arthropoda; Asia; Assemblages; Bay of Bengal; Biota; Cenozoic; Climate change; Cores; Correlation; Crustacea; Current research; Ecology; Foraminifera; Gastropoda; Holocene; India; Indian Ocean; Indian Peninsula; Indicators; Integrated Ocean Drilling Program; International Ocean Discovery Program; Invertebrata; Last glacial maximum; Mandibulata; Marine environment; Microfossils; Micropaleontology; Modern analogs; Mollusca; Monsoons; Morphology; Nannoplankton; Neogene; North Atlantic Deep Water; Ocean Drilling Program; Ostracoda; Paleo-oceanography; Paleocene-Eocene Thermal Maximum; Paleocirculation; Paleoclimatology; Paleoenvironment; Paleogene; Plankton; Pleistocene; Productivity; Protista; Pteropoda; Quaternary; Reconstruction; Sea water; Seasonal variations; Southern Ocean; Spatial distribution; Species diversity; Taxonomy; Tertiary; Time scales; Ventilation
Coordinates: N050000 N230000 E0940000 E0800000
S010000 N303000 E0770000 E0473000
Record ID: 2017039126
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.