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The present paper focuses on interpreting the distribution of magnetic minerals, temporal variability, and linkages with paleoclimate variability using multiple magnetic proxy parameters of a lake core obtained from Dewar Lake situated in Chamoli, UttarakhandChamoli, Utttarkhand. The parameters reflecting variability in magnetic concentration, e.g., magnetic susceptibility (χ), anhysteretic remanent magnetization (ARM), saturation isothermal remanent magnetization (SIRM), ARM/χ, SIRM/χ, and ARM/SIRM, were measured, representing the entire sediment succession during the last ~30,000 cal. years. S-Ratio, soft isothermal remanent magnetization (Soft IRM), and hard IRM were used to comprehend changes in magnetic minerals in the sediments. Magnetic susceptibility, ranging from 0.18 to 1.48 × 10−7 m3 kg−1, and interparametric grain size of ARM/χ, SIRM/χ, and ARM/SIRM indicate coarser multidomain (MD) magnetite and hematite contents in sediments, suggesting catchment-dominated detrital magnetic minerals in the sediment flux. Based on the characteristics of the core sediments, e.g., color variation, texture, grain size, presence of organic matter, and sedimentary structures as well as magnetic parameters particularly S-ratio and magnetic susceptibility (χ) which have been considered as extremely sensitive climatic parameter, eight units were detected, showing four prominent humid and three dry phases with one unit showing uneven climatic pattern, which has been revealed for the past 30,000 yr BP.

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Paleoclimate Reconstruction and Magnetic Mineral Origin in Late Quaternary Chamoli Sediments

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  • 发表日期：

    2026年

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  • Kamini Bisht,
  • B. S. Kotlia,
  • Bernd Wunnemann,
  • Neha Kholia

摘要

The present paper focuses on interpreting the distribution of magnetic minerals, temporal variability, and linkages with paleoclimate variability using multiple magnetic proxy parameters of a lake core obtained from Dewar Lake situated in Chamoli, UttarakhandChamoli, Utttarkhand. The parameters reflecting variability in magnetic concentration, e.g., magnetic susceptibility (χ), anhysteretic remanent magnetization (ARM), saturation isothermal remanent magnetization (SIRM), ARM/χ, SIRM/χ, and ARM/SIRM, were measured, representing the entire sediment succession during the last ~30,000 cal. years. S-Ratio, soft isothermal remanent magnetization (Soft IRM), and hard IRM were used to comprehend changes in magnetic minerals in the sediments. Magnetic susceptibility, ranging from 0.18 to 1.48 × 10−7 m3 kg−1, and interparametric grain size of ARM/χ, SIRM/χ, and ARM/SIRM indicate coarser multidomain (MD) magnetite and hematite contents in sediments, suggesting catchment-dominated detrital magnetic minerals in the sediment flux. Based on the characteristics of the core sediments, e.g., color variation, texture, grain size, presence of organic matter, and sedimentary structures as well as magnetic parameters particularly S-ratio and magnetic susceptibility (χ) which have been considered as extremely sensitive climatic parameter, eight units were detected, showing four prominent humid and three dry phases with one unit showing uneven climatic pattern, which has been revealed for the past 30,000 yr BP.