Late Quaternary environmental and sea level changes from Kolleru Lake, SE India: Inferences from mineral magnetic, geochemical and textural analyses

Basavaiah, N.; Babu, J.L.V. Mahesh; Gawali, Praveen B.; Kumar, K. Ch. V. Naga; Demudu, G.; Prizomwala, S. P.; Hanamgond, P. T.; Rao, K. Nageswara

doi:10.1016/j.quaint.2014.12.018

Cited by 25 publications

(4 citation statements)

References 27 publications

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“…The sediment sources determine the mineralogy while transport conditions and depositional environments control concentration and grain-size distribution of magnetic minerals. The values of χFD% of 2.0% indicate virtually no SP grains, between 2.0 and 10.0% they indicate an admixture of SP and coarser non-SP grains, between 10.0 and 14.0% they indicate all SP grains (Dearing et al, 1996;Basavaiah, 2011;Basavaiah et al, 2015Basavaiah et al, , 2019. Relatively high χFD% values of between 2 and 5% indicate a higher proportion of soil component in a relatively weathered sediment, which is generally characterised by a slower deposition rate.…”

Section: Magnetic Susceptibilitymentioning

confidence: 99%

Multi-Proxy Records of Late Holocene Flood Events From the Lower Reaches of the Narmada River, Western India

et al. 2021

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Analyses of a fluvial sedimentary sequence from the lower reaches of the Narmada River establish a record of rhythmic cycles of sediment facies that represent floods during the late Holocene. The south-west Indian monsoon strongly influences the study area, and heavy rainfall or cyclones which originate from either the Bay of Bengal or the Arabian Sea, also affect the region. Optically stimulated luminescence dating places the 8 m thick sediment sequence in the climate transition phase which ranges from the Medieval Warm Period to the Little Ice Age. Multi-proxy analyses including high-resolution granulometry, magnetic susceptibility, ferromagnetic mineral concentration, facies major oxide geochemistry, and micro-fossil records (from two sedimentary units) are used to study these late Holocene flood events. The latter are characterised by multiple sediment facies, depositional events, changes in channel morphology, and distinctive flood signatures. Integration of these records enables to identify two distinct aggradations viz. phase I and phase II, as well as a relative change in channel morphology. The study describes 11 flooding events and their imprints over multi-proxy records. Historic documents and instrumental records from the town of Bharuch referring to floods, movement of channel sand, channel shallowing, and the dysfunction of the ancient port of Bharuch further validate the inferences drawn from the sedimentary sequence. The study exemplifies the need to use high resolution and multi-proxy studies to interpret paleoflood records and climate signatures in order to build archives of monsoonal rivers.

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Section: Magnetic Susceptibilitymentioning

confidence: 99%

Multi-Proxy Records of Late Holocene Flood Events From the Lower Reaches of the Narmada River, Western India

et al. 2021

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“…Many paleoclimate records available in Sri Lanka and India imply a general weakening trend of Indian summer monsoon during the middle and late Holocene (Prasad et al, 1997;Premathilake and Risberg, 2003;Ponton et al, 2012;Leipe et al, 2014;Prasad et al, 2014;Basavaiah et al, 2015;Ankit et al, 2017;Gayantha et al, 2017;Ratnayake et al, 2017;Gayantha et al, 2020, see Figure 6). The notable exception to this trend can be observed in the records from the South Indian peninsular region, which imply a progressive or stepwise increase in rainfall and/fluctuation in intensity in some cases (Veena et al, 2014;Rajmanickam et al, 2017;Sandeep et al, 2017, see Figure 6).…”

Section: Mid-late Holocene Human-environment Interactions In Sri Lankamentioning

confidence: 99%

Mid-Late Holocene Sub-Millennial Scale Inverse Trends of South Asian Summer and Winter Monsoons in Sri Lanka

et al. 2021

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The South Asian Monsoon (SAM) brings precipitation crucial for agriculture across the densely populated region of South Asia. Identifying the key long-term drivers of the SAM is essential to improve the predictability of future monsoonal trends in the context of current global climate scenarios and increasingly frequent drought and flooding events in this part of the world. Here, we reconstruct ∼6000 years of climatic and environmental history of the South Asian summer monsoon-fed Bolgoda South Lake and the Horton Plains, and the winter monsoon-fed Panama lagoon, in Sri Lanka to better understand monsoonal operation over this island and its connection to broader climate systems. Multiple proxies (diagnostic biomarkers, hydrogen and carbon isotopes of individual n-alkane, grain size, and Zr/Rb elemental ratio) indicate a sub-millennial scale decreasing trend of summer monsoon rainfall in the wet zone of Sri Lanka alongside an increasing trend of winter monsoon rainfall in the dry zone during the last ∼6000 years. We also observed multi-centennial scale arid events in the Bolgoda South Lake and Horton Plains records at ∼3,500 and ∼1,000 cal years BP. Inverse monsoonal behavior during the mid- and late Holocene seems to be led by the southward migration of the mean latitudinal position of ITCZ, induced by varying solar energy distribution between the Northern and Southern hemispheres due to Earth’s processional cycle. Our observations are broadly supported by existing paleoclimatic records from the Indian sub-continent, but abrupt arid phases are asynchronous in the regional records. In addition, these short-term arid conditions do not show systematic correlations with the different modes of climate variables known to have teleconnections with the Indian Ocean monsoon.

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“…The magnetic grain size and thus domain structure of iron minerals in sediments range between multidomain (MD), stable single domain (SSD or SD), pseudo-SD (PSD), and superparamagnetic (SP) grains. Information about the magnetic grain size in sediments can be used to identify sediment provenance areas [102,103]. We describe here the magnetic mineral data with reference to the pollen zone constituting the sediment profile.…”

Section: Introductionmentioning

confidence: 99%

Revisit the Medieval Warm Period and Little Ice Age in Proxy Records from Zemu Glacier Sediments, Eastern Himalaya: Vegetation and Climate Reconstruction

Mehrotra¹,

Basavaiah

Shah³

2023

Quaternary

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The Late Holocene fossil pollen records from the Zemu glacier, located in Yabuk, North Sikkim, in the eastern Himalayas, effectively generated quantitative climate reconstructions based on the transfer function model. The transfer function model was developed by establishing a modern pollen–climate calibration set from the temperate alpine belt of North Sikkim. A redundancy analysis was carried out to detect the pattern of variation of climatic variables in the modern pollen datasets. The mean annual precipitation (MAP) and mean temperature of the warming month (MTWA) had the strongest influence on the composition of the modern pollen samples among the climatic variables considered in the analysis. Proxy data in the form of fossil pollen records were analyzed for reconstructing past climate based upon the relationships between modern pollen vegetation assemblages and climatic patterns. Transfer functions for MAP and MTWA were developed with the partial least squares (PLS) approach, and model performance was assessed using leave-one-out cross-validation. The validated model was used to reconstruct MAP and MTWA for the last 2992 cal years BP (1042 BC) in North Sikkim. The variability observed in the reconstructions was analyzed for past global climatic events. It was further compared with the available regional and hemispheric proxy-based climate reconstructions. The reconstructions captured comparable Medieval Warm Period (MWP) and Little Ice Age (LIA)-like events from the Zemu glacier region. The fossil pollen data and climate reconstructions were further compared with the mineral magnetism data of the subsurface sediment profile.

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Late Quaternary environmental and sea level changes from Kolleru Lake, SE India: Inferences from mineral magnetic, geochemical and textural analyses

Cited by 25 publications

References 27 publications

Multi-Proxy Records of Late Holocene Flood Events From the Lower Reaches of the Narmada River, Western India

Multi-Proxy Records of Late Holocene Flood Events From the Lower Reaches of the Narmada River, Western India

Mid-Late Holocene Sub-Millennial Scale Inverse Trends of South Asian Summer and Winter Monsoons in Sri Lanka

Revisit the Medieval Warm Period and Little Ice Age in Proxy Records from Zemu Glacier Sediments, Eastern Himalaya: Vegetation and Climate Reconstruction

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