M. C. Manoj

Academy of Scientific and Innovative Research

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Christian France‐Lanord

Centre de Recherches Pétrographiques et Géochimiques

Brendan T. Reilly

Lamont-Doherty Earth Observatory

Michael E Weber

University of Bonn

V. Spieß

University of Bremen

Kohki Yoshida

Shinshu University

Hendrik Lantzsch

University of Bremen

Trevor Williams

Texas A&M University

Peter A. Selkin

University of Washington

Laure Meynadier

Institut de physique du globe de Paris

Adam Klaus

International Ocean Discovery Program

Cooperative Institutions

International Ocean Discovery Program

Academy of Scientific and Innovative Research

Indian Institute of Management Lucknow

Banaras Hindu University

Mangalore University

Centre National de la Recherche Scientifique

University of Lucknow

Ministry of Earth Sciences

National Centre for Antarctic and Ocean Research

Manipal Academy of Higher Education

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Glacial‐interglacial variability in diatom abundance and valve size: Implications for Southern Ocean paleoceanography

Paleoceanography (2015)

Abhilash Nair Rahul Mohan M. C. Manoj Meloth Thamban

Abstract Antarctic sea ice extent along with Southern Ocean biological productivity varied considerably during glacial‐interglacial periods, and both are known to have played a considerable role in regulating atmospheric CO 2 variations in the past. Here we present data on diatom absolute abundance (valves/g of sediment) and size over the past ~ 42 ka B.P. and how they link to glacial‐interglacial changes in Antarctic sea ice extent, Southern Ocean frontal systems, and aeolian dust flux. Our records of sea ice and permanent open ocean zone diatom abundances suggest a shift in the Antarctic winter sea ice limit and Polar Front respectively up to the modern‐day Polar Frontal Zone during marine isotopic stages (MIS) 2 and late MIS 3. In addition to glacial shifts in the Polar Front, diatom assemblages also recorded a plausible northward shifts in Polar Front during few intervals of MIS 1. Glacial periods north of the Polar Front in the Indian sector of the Southern Ocean were characterized by higher total diatom abundance, larger Fragilariopsis kerguelensis apical length, and Thalassiosira lentiginosa radius. This is probably a consequence of (1) a northward expansion of the opal belt, a region characterized by high production and export of biogenic silica; (2) an increase in terrigenous input, via erosion of Crozet Islands; and (3) the alleviation of iron deficit by high input of Fe‐bearing dust. The larger and highly silicified diatoms such as F . kerguelensis and T . lentiginosa may have mainly contributed in transporting biogenic silica and organic carbon to the seabed for the last 42 ka, in the northern Polar Frontal Zone of the Indian sector of the Southern Ocean.

Polar front

Biogenic silica

10.1002/2014pa002680

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Citations (22)

International Ocean Discovery Program Expedition 354 Preliminary Report Bengal Fan

Preliminary report (2015)

Christian France‐Lanord V. Spieß T. Schwenk Adam Klaus Rishi R. Adhikari

International Ocean Discovery Expedition 354 to 8°N in the Bay of Bengal drilled a seven site, 320 km long transect across the Bengal Fan.Three deep-penetration and an additional four shallow holes give a spatial overview of the primarily turbiditic depositional system that comprises the Bengal deep-sea fan.Sediments originate from Himalayan rivers, documenting terrestrial changes of Himalayan erosion and weathering, and are transported through a delta and shelf canyon, supplying turbidity currents loaded with a full spectrum of grain sizes.Mostly following transport channels, sediments deposit on and between levees while depocenters laterally shift over hundreds of kilometers on millennial timescales.During Expedition 354, these deposits were documented in space and time, and the recovered sediments have Himalayan mineralogical and geochemical signatures relevant for reconstructing time series of erosion, weathering, and changes in source regions, as well as impacts on the global carbon cycle.Miocene shifts in terrestrial vegetation, sediment budget, and style of sediment transport were tracked.Expedition 354 has extended the record of early fan deposition by 10 My into the late Oligocene.

10.14379/iodp.pr.354.2015

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Palaeoclimatic and palaeoenvironmental history of the late Quaternary sediments in a core from the Indian sector of the Southern Ocean: rock magnetic and geochemical signals

Quaternary International (2012)

M. C. Manoj

10.1016/j.quaint.2012.08.833

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Climatic Oscillations and Dynastic Trends: A Multiproxy Analysis of the Past Two Millennia in the Indian Subcontinent

Anjali Trivedi Shailesh Agarwal Anupam Sharma Sheikh Nawaz Ali M. C. Manoj

Indian subcontinent

10.2139/ssrn.4675630

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IODP Expedition 354 Alkalinity and pH

Zenodo (CERN European Organization for Nuclear Research) (2016)

Christian France‐Lanord V. Spieß Adam Klaus Tilmann Schwenk Rishi R. Adhikari

Alkalinity was determined by Gran titration with an autotitrator (Metrohm 794 basic Titrino) using 0.1 M HCl at 20 degrees C. Report includes alkalinity, correction factor (if applicable), and pH.

Alkalinity

10.5281/zenodo.7865348

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IODP Expedition 354 Micropaleontology

Zenodo (CERN European Organization for Nuclear Research) (2016)

Christian France‐Lanord V. Spieß Adam Klaus Tilmann Schwenk Rishi R. Adhikari

Paleontological data were collected using microscopes and recorded in the JRSO description software. All data for a species group (e.g., diatoms or nannofossils) were collected in a Microsoft Excel worksheet by hole. A zip file of the entire expedition's observations is also available.

Micropaleontology

10.5281/zenodo.7865380

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Paleoceanographic Changes during the Past 95000 Years from the Indian Sector of the Southern Ocean

AGU Fall Meeting Abstracts (2012)

M. C. Manoj T. Meloth R S Lal Mohan

Source

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Climatic Oscillations and Dynastic Trends: A Multiproxy analysis of the past two millennia in the Indian Subcontinent

CATENA (2024)

Anjali Trivedi Shailesh Agrawal Anupam Sharma Sheikh Nawaz Ali M. C. Manoj

Indian subcontinent

10.1016/j.catena.2024.108424

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Danian-Ypresian dinocyst biostratigraphy, fish fauna and depositional environment of the Akli Formation, Barmer Basin, western India

Historical Biology (2023)

Prem Raj Uddandam Vivesh V. Kapur Shalini Parmar Mahi Bansal M. C. Manoj

Herein, we present a diverse record of dinoflagellate cysts from the lignite-associated sedimentary succession (belonging to the Akli Formation) at Sonari Lignite Mine, Barmer Basin, Rajasthan State, western India. The dinoflagellate cyst assemblage implies a Danian to Ypresian age for the investigated succession and argues that the deposition of lignitic sequences along India's western margin is not coeval. We also identify two vertebrate (dominantly fish-yielding) units within the studied Akli Formation succession. The Ypresian fish genera (mainly represented by dental remains) include Ginglymostoma, Jaekelotodus, Brachycarcharias, Pycnodus and Myliobatis while the Selandian-Thanetian fish dental remains include Dasyatis. A discontinuous distribution of fish fauna during the early Paleogene (based on the temporal and spatial data) within the lignite-associated sedimentary successions of western and north India allows us to infer the prevalence of separated realms with variably restricted palaeoenvironmental conditions. Overall, the faunal evidence is indicative of dominantly estuarine to shallow marine conditions with enhanced freshwater influence during the Thanetian as compared to the Danian. Our study also argues in favour of the earliest appearance of dinoflagellate cyst Apectodinium in the near-equatorial region of the Tethys Ocean during the early Paleocene. (within Danian).

Paleogene

Dinocyst

Dinoflagellate

10.1080/08912963.2023.2214585

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Proceedings of the International Ocean Discovery Program. Expedition reports (2016)

Christian France‐Lanord V. Spieß Adam Klaus T. Schwenk Ram Chandra Adhikari

International Ocean Discovery Program Expedition 354 to 8°N in the Bay of Bengal drilled a seven-site, 320 km long transect across the Bengal Fan.Three deep-penetration and an additional four shallow holes give a spatial overview of the primarily turbiditic depositional system that comprises the Bengal deep-sea fan.Sediments originate from Himalayan rivers, documenting terrestrial changes of Himalayan erosion and weathering, and are transported through a delta and shelf canyon, supplying turbidity currents loaded with a full spectrum of grain sizes.Mostly following transport channels, sediments deposit on and between levees while depocenters laterally shift over hundreds of kilometers on millennial timescales.During Expedition 354, these deposits were documented in space and time, and the recovered sediments have Himalayan mineralogical and geochemical signatures relevant for reconstructing time series of erosion, weathering, and changes in source regions, as well as impacts on the global carbon cycle.Miocene shifts in terrestrial vegetation, sediment budget, and style of sediment transport were tracked.Expedition 354 has extended the record of early fan deposition by 10 My into the late Oligocene.

10.14379/iodp/proc.354.2016

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