Variation of Paleo-productivity and Terrigenous Input in the Eastern Arabian Sea during the Past 100 ka

Ishfaq, Ahmad Mir; Pattan, J.N.; Matta, V.M.; Banakar, V.K.

doi:10.1007/s12594-013-0086-7

Cited by 20 publications

(15 citation statements)

References 43 publications

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“…The sedimentation rates of the core were estimated by the age of sediment and thickness of sedimentary column. It varies from 0.39 to 7.3 cm/ka with an average w3 cm/ka which are quite similar to that found in a typical continental margin (Van Campo et al, 1982;Clemens and Prell, 1990;Shimmield et al, 1990;Shimmield and Mowbray, 1991;Prell et al, 1992;Sarkar et al, 1993;Sirocko et al, 1996Sirocko et al, , 2000Schulz et al, 1998;von Rad et al, 1999;Thamban et al, 2001;Banakar et al, 2005;Kessarkar and Rao, 2007;Kessarkar et al, 2010;Singh et al, 2011;Ishfaq et al, 2013). From similar sediment accumulation data, various palaeoclimatic inferences have been drawn by many investigators, for instance, determining Table 1 Uncalibrated and calibrated 14 C ages of selected species of Globigerinoides sacculifer size fractions (250e500 mm) in the sediment core SK221/05.…”

Section: Resultssupporting

confidence: 76%

“…Paleoproductivity in the major part of the western continental margin of India seems to have been controlled by the northeast monsoon, particularly during the last glacial cycles (MIS-2 to MIS-4) as compared to the present interglacial one (MIS-1; Sarkar et al, 1993;Thamban et al, 2001;Banakar et al, 2005;Kessarkar and Rao, 2007;Kessarkar et al, 2010;Singh et al, 2011;Ishfaq et al, 2013). In contrast, the paleoproductivity scenario was found to have been different in the southeastern continental margin during the late Quaternary as there is fragmented and conflicting information (Sarkar et al, 1993(Sarkar et al, , 2000Pattan et al, 2001Pattan et al, , 2003Pattan et al, , 2005Verma and Sudhakar, 2006;Narayana et al, 2009;Das et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Glacial-interglacial productivity contrasts along the eastern Arabian Sea: Dominance of convective mixing over upwelling

Kumar

Manjunath

Kurian

2015

Geoscience Frontiers

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a b s t r a c tThe western continental margin of India is one of the highly productive regions in the global ocean. Primary productivity is induced by upwelling and convective mixing during the southwest and northeast monsoons respectively. Realizing the importance of high primary productivity, a sediment core was collected below the current oxygen minimum zone (OMZ) from the southwestern continental margin of India. This was dated by AMS radiocarbon and as many as 60 paleoclimate/paceoceanographic proxies, such as particle size, biogenic components, major, trace and rare earth elements (REEs) which were measured for the first time to determine sources of sediment, biogeochemical processes operating in the water column and their variations since the last glacial cycle. R-mode factor analysis of comprehensive data indicates that the dominant regulator of paleoproductivity is the southwest monsoon wind induced upwelling. Other paleoproductivity related factors identified are the marine biogenic component and biogenic detritus (as an exported component from the water column added to the bottom sediment). All paleoproductivity components increased significantly during the marine isotope stage-1 (MIS-1) compared to those accumulated from MIS-4 to MIS-2. The second group of factors identified are the terrigenous sediments with heavy minerals like zircon and ilmenite. The terrigenous sediment, in particular, increased during MIS-2 when the sea-level was lower; however, the heavy mineral component fluctuated over time implying pulsed inputs of sediment. The diagenetic fraction and reducing component are the third group of factors identified which varied with time with increased accumulation during the MIS transitions.The primary productivity along the southwestern continental margin of India seems to have been controlled principally by the upwelling during the southwest monsoon season that was weaker from MIS-4 to MIS-2, as relative to that during the MIS-1. In contrast, increased glacial productivity noticed in sediments deposited below the current oxygen minimum zone (OMZ) along the north of the study area that can be linked to entrainment of nutrients through the intensified convective mixing of surface water during the northeast monsoon. The sequestration of greenhouse gases by the western continental margin of India was higher during glacial than interglacial cycles.Ó 2015, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).

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Section: Resultssupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Glacial-interglacial productivity contrasts along the eastern Arabian Sea: Dominance of convective mixing over upwelling

Kumar

Manjunath

Kurian

2015

Geoscience Frontiers

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“…Hence, the intensified winter winds of the glacial period might have played a significant role in the derivation of fine grained terrigenous material from the continental region and its transportation to the eastern Arabian Sea. Ishfaq et al (2013) recorded less terrigenous input in the eastern Arabian Sea during the past 5 ka. In this study, there is no distinct change observed in the biogenic carbonate during the above period although humidity index shows a minor fall.…”

Section: Paleoenvironmental Implicationsmentioning

confidence: 92%

“…The deposition of sediment in the Arabian Sea can be from a number of sources, i.e., dust originated from Arabia, fluvial detritus from the Indian subcontinent and Somalia (Das et al 2013;Ishfaq et al 2013). Based on the chemical composition of the sediments it is suggested that sediments may also be derived by submarine weathering of Carlsberg Ridge (Shankar et al 1987).…”

Section: Introductionmentioning

confidence: 99%

“…Based on the chemical composition of the sediments it is suggested that sediments may also be derived by submarine weathering of Carlsberg Ridge (Shankar et al 1987). The supply of terrigenous material to the Arabian Sea is strongly linked to the intensity of monsoon (Haake et al 1993;Ishfaq et al 2013). In the eastern Arabian Sea, sediments deposited are mainly transported by fluvial processes (Paropkari 1990), whereas, in the western Arabian Sea they are mainly transported by aeolian processes (Krissek and Clemens 1991;Das et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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Heavy mineral variation in the deep sea sediment of southeastern Arabian Sea during the past 32 kyr

Akaram

Das

et al. 2015

J Earth Syst Sci

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The present study is based on heavy mineral assemblages (HM) of top 104-cm thick section of gravity core SK 221 (Lat. 8 • 7.12 N; Long. 73 • 16.38 E and water depth -2188 m) located near the ChagosLaccadive Ridge in the southeastern Arabian Sea to evaluate the provenance and paleoenvironmental changes during the last 32 kyr. The biogenic carbonate, acid insoluble residue, magnetic susceptibility, total organic carbon (TOC) and clay based humidity index, i.e., kaolinite/illite ratio are also utilized to correlate with the above paleoenvironmental changes. Ilmenite, garnet, staurolite, pyroxenes, andalusite and zircon are the dominant HM with moderate to low ZTR (zircon-tourmaline-rutile) index indicating instability of the sediments and rapid erosion in the source region. The characteristic HM suggest their mixed sources from the basic igneous, gneisses/granites, high grade metamorphic rocks and sandstones occurring mainly in the western and southwestern India. The temporal variations of HM, AIR (acid insoluble residue), MS (magnetic susceptibility), biogenic carbonate and C org (TOC) during preglacial and early Holocene suggest intensive weathering, erosion, and transportation of terrigenous detritus from continental region by fluvial processes and summer monsoon led high biogenic productivity, respectively. The convective mixing of waters due to intense winter monsoon resulted in very high biogenic carbonate content during the early stages of glacial period. The HM and associated proxies indicated that the winter monsoons of Heinrich (H3, H2, and H1) and Younger Dryas (YD) events and summer monsoons of Bølling/Allerød (BA) event were not strong enough to bring drastic changes in the above parameters.

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Palaeoenvironmental applications of chromium and aluminium: Concerns on partitioning and early diagenetic remobilization

et al. 2020

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Sequential extraction of core samples collected from Pulicat Lake, east coast of India, showed that on average, 59% of labile Cr and 28% of labile Al remain adsorbed onto Fe-Mn oxides. Similarly, 61% of labile Al and 36% of labile Cr are associated with organic matter. Cross-correlation analysis revealed that in the Fe-Mn oxides phase, Cr primarily exists with Mn-oxides, while Al remains mainly adsorbed onto Fe-oxides.Factor analysis revealed four factors that could explain 82% of the variance in the data. Changes in water column ionic composition, salinity, dissolution of Fe-Mn oxides during microbial oxidation of organic matter, changes occurring to the organic matter and calcium carbonate during early diagenesis are the key factors influencing the Al and Cr concentrations in the labile fractions. The results of this study are useful to interpret palaeoenvironmental conditions.

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Variation of Paleo-productivity and Terrigenous Input in the Eastern Arabian Sea during the Past 100 ka

Cited by 20 publications

References 43 publications

Glacial-interglacial productivity contrasts along the eastern Arabian Sea: Dominance of convective mixing over upwelling

Glacial-interglacial productivity contrasts along the eastern Arabian Sea: Dominance of convective mixing over upwelling

Heavy mineral variation in the deep sea sediment of southeastern Arabian Sea during the past 32 kyr

Palaeoenvironmental applications of chromium and aluminium: Concerns on partitioning and early diagenetic remobilization

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