Late Quaternary environmental studies on salt lakes in western Rajasthan, India: a summarised view

Kajale, M. D.; Deotare, B. C.

doi:10.1002/(sici)1099-1417(199709/10)12:5<405::aid-jqs323>3.0.co;2-n

Cited by 32 publications

(17 citation statements)

References 11 publications

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“…11 for location) sediments show a variation of climatic and hydrological variations during their deposition (Kajale & Deotare 1997). Weakly laminated bands of silt and clay at 4-6 m depth (.10 ka) indicate that the playa was ephemeral, and shallow, and that the occurrence of typical desert species pollen from these lower levels indicates relatively dry conditions during an early phase of sedimentation (Kajale & Deotare 1997). This was followed by a period of high salinity between 10 ka and 8 ka, as indicated by the presence of laminar gypsum with silt and clay.…”

Section: Lacustrine Records From Thar Desert and Ganga Plainsmentioning

confidence: 99%

“…12. Palaeoclimatic history of Thar desert based on lacustrine records (data source: Wasson et al 1984;Kajale & Deotare 1997;Enzel et al 1999;Kale et al 2003;Sinha et al 2006b). 1987) suggesting gradual strengthening of the Indian summer monsoon after 20 ka reaching a maximum around 10 ka. The period c. 16.0 to 7.5 ka is marked by variable salinity, higher chemical weathering and higher organic productivity, and therefore, suggests semi-humid conditions.…”

Section: Lacustrine Records From Thar Desert and Ganga Plainsmentioning

confidence: 99%

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Evolution of the Indian summer monsoon: synthesis of continental records

Sanyal

Sinha

2010

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Fluvial sediments of the Siwalik succession in the Himalayan Foreland Basin form the most important continental archive for reconstructing monsoonal fluctuations during the Late Miocene to Late Pleistocene. A number of proxy records suggest multiple phases of monsoonal intensification with peaks at 10.5, 5.5 and 3 Ma after which the strength of the monsoon decreased to modern day values with minor fluctuations. Detailed evaluation of Late Quaternary interfluve stratigraphic development in the Ganga plains shows that interfluve areas near the major rivers aggraded periodically between 27 and 90 ka. They subsequently degraded or accumulated sediment only locally, probably reflecting decreased monsoonal precipitation around the Last Glacial Maximum. Increased precipitation during the 15 to 5 ka period of monsoon recovery probably increased discharge and promoted incision and widespread badland formation. In western India, the fluvial records back to c. 128 ka suggest a stronger monsoon around 80 ka followed by periods of weakened monsoon around 70 to 30 ka and progressive desiccation in the glacial period. Holocene lacustrine records from western Rajasthan suggest maximum lake levels at c. 6 ka and complete desiccation between c. 3 and 4 ka.

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Section: Lacustrine Records From Thar Desert and Ganga Plainsmentioning

confidence: 99%

Section: Lacustrine Records From Thar Desert and Ganga Plainsmentioning

confidence: 99%

Evolution of the Indian summer monsoon: synthesis of continental records

Sanyal

Sinha

2010

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“…All the major saline lakes in the desert turned into perennial lakes. Consequently they received higher amounts of silt-clay deposition (Singh et al 1974(Singh et al , 1990Kajale and Deotare 1997;this issue). The aeolian landscape in the westernmost part of the desert was, however, influenced for a shorter period of time by this wetter climate.…”

Section: The Holocene Recordmentioning

confidence: 99%

The aeolian sedimentation record of the Thar desert

Singhvi

Kar

2004

J Earth Syst Sci

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“…Earlier studies on the vegetational history (Singh et al 1974(Singh et al , 1990, mineralogy and geochemistry (Wasson et al 1983;Roy et al 2001), lithostratigraphy and pollen analytical studies (Sharma and Chauhan 1991;Deotare and Kajale 1996;Kajale and Deotare 1997;Deotare and Kajale 2002) on saline lakes in Rajasthan have provided a firm foundation for further scientific studies. Recent advances in luminescence dating of sand dunes and application of AMS 14 C dating to organically poor playa sediments, stable isotope studies of carbon and oxygen of pedogenically formed carbonates within aeolian, fluvial and fluvio-lacustral sediments have enhanced understanding of the palaeoenvironment of the Thar desert (Enzel et al 1999;Thomas et al 1999;Kajale et al 1999;Juyal et al 2000;Kajale et al 2000;Kajale et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Palaeoenvironmental history of Bap-Malar and Kanod playas of western Rajasthan, Thar desert

et al. 2004

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Two playas in the arid core of the western margin of the Thar desert viz., Bap-Malar and Kanod, have been investigated using palynology, geomorphology, archaeology, AMS-radiocarbon dating, stable isotopes, evaporite mineralogy and geoarchaeology. The principal objective was to obtain a reliable lithostratigraphy of the playa sediments. These are about 7 m thick in the Bap-Malar and > 2.5 to 3 m thick in the Kanod. AMS 14 C dates of > 15 ka BP on pollen from sediment layers indicates that the Bap-Malar playa possibly existed even during the LGM. These playas were full of water during the early Holocene (8 ka BP-5.5 ka BP) and were ephemeral during the Pleistocene-Holocene transition and early to mid to late Holocene. The playas dried almost 1000 years earlier than those occurring on the eastern margin. Pollen of graminaceae, chenopodiaceae/amaranthaceae, cyperaceae etc. and evaporite minerals like gypsum, halite in the profiles indicate that the playas were surrounded by vegetation dominated by grass and that, they remained brackish to saline even during the mid Holocene, lake full stage. Stable dune surfaces, pediments with regoliths, and gravelly channels of ephemeral streams provided a favorable geomorphic niche for nomadic human activity since ∼ 7 ka BP. Though local ecological factors have played an important role in the evolution of the playas, the winter rains, connected with northwesterly depressions, most likely played a vital role in maintaining these playas.

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Late Quaternary environmental studies on salt lakes in western Rajasthan, India: a summarised view

Cited by 32 publications

References 11 publications

Evolution of the Indian summer monsoon: synthesis of continental records

Evolution of the Indian summer monsoon: synthesis of continental records

The aeolian sedimentation record of the Thar desert

Palaeoenvironmental history of Bap-Malar and Kanod playas of western Rajasthan, Thar desert

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