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Accueil du site → Doctorat → Inde → 2003 → Chronology of dryland sediments in western India and their correlation with the climatic changes in central Himalaya

Maharaja Sayajirao University of Baroda (2003)

Chronology of dryland sediments in western India and their correlation with the climatic changes in central Himalaya

Juyal Navin C

Titre : Chronology of dryland sediments in western India and their correlation with the climatic changes in central Himalaya

Auteur : Juyal Navin C

Université de soutenance : Maharaja Sayajirao University of Baroda

Grade  : Doctor of Philosophy (PhD) 2003

Sommaire partiel
The study is an attempt to reconstruct the Late Quaternary climate change from ecologically sensitive desert margin of western India (North Central Gujarat) and proglacial lake deposits in the Higher Central Himalaya. In the desert margin, three river basins viz. the Sabarmati, Mahi and Orsang were investigated for their fluvio-aeolian records. A detailed field stratigraphy supported by sedimentology and chronometric studies enabled in reconstructing the pattern of climate change during past 100 ka. Similarly, the relict lake sediments in the Garbayana and Goting basins ofHigher Central Himalaya were studied for reconstructing palaeoclimatic and seismic events. The data thus generated on pattern of climate change during the Late Quaternary has been compared in order to see the linkages between the desert margin and the Higher Central Himalaya.

Based on the earlier studies it can be suggested that (i) except for few chronometric data from the Sabarmati and Mahi basins, the chronology offluvial aggradation was mainly based on indirect age estimates. (ii) dry lands are known for abrupt climatic changes in the past. Except for few studies from the core of the Thar Desert, little is known from the desert margins about the nature of climatic transition. (iii) fluvial aggradation in the region is intimately associated with the southwest monsoon ; and only a tentative palaeo-monsoonal reconstruction is available. (iv) present day rivers are slope deviatory and have deeply incised the Quaternary sequences. No estimate (time and factors responsible) exists. (v) a detailed dime chronology along the east west transects ofthe Thar desert has been reported by various workers. However, barring few preliminary data on the chronology of fossil dunes in the southern margin of Thar desert no detailed study on the chronology of dune accretion exists. (vi) similarly, except for few selected studies on Quaternary glaciation and on the relict lake sediments, not much information was avialabe on the Late Quaternary climate from the Central Himalaya.

Mots clés : Chronology Climatic Correlation Dryland Sediments

Présentation et version intégrale (Shodhganga)

Page publiée le 26 janvier 2016, mise à jour le 31 janvier 2021