Palaeoenvironmental implications of evaporative gaylussite crystals from Lonar 
Lake, central India

Anoop, A.; Prasad, Sushma; Plessen, Birgit; Basavaiah, N.; Gaye, B.; Naumann, Rudolf; Menzel, P.; Weise, S.; Brauer, Achim

doi:10.1002/jqs.2625

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Palaeoenvironmental implications of evaporative gaylussite crystals from Lonar Lake, central India

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Anoop, A.
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Prasad, Sushma
5.2 Climate Dynamics and Landscape Evolution, 5.0 Earth Surface Processes, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Plessen, Birgit
5.2 Climate Dynamics and Landscape Evolution, 5.0 Earth Surface Processes, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Basavaiah, N.
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Gaye, B.
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Naumann, Rudolf
4.2 Inorganic and Isotope Geochemistry, 4.0 Chemistry and Material Cycles, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Menzel, P.
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Weise, S.
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Brauer, Achim
5.2 Climate Dynamics and Landscape Evolution, 5.0 Earth Surface Processes, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Anoop, A., Prasad, S., Plessen, B., Basavaiah, N., Gaye, B., Naumann, R., Menzel, P., Weise, S., Brauer, A. (2013): Palaeoenvironmental implications of evaporative gaylussite crystals from Lonar Lake, central India. - Journal of Quaternary Science, 28, 4, 349-359.
https://doi.org/10.1002/jqs.2625

https://gfzpublic.gfz-potsdam.de/pubman/item/item_247144

Abstract

We have undertaken petrographic, mineralogical, geochemical and isotopic investigations on carbonate minerals found within a 10-m-long core from Lonar Lake, central India, with the aim of evaluating their potential as palaeoenvironmental proxies. The core encompasses the entire Holocene and is the first well-dated high-resolution record from central India. While calcite and/or aragonite were found throughout the core, the mineral gaylussite was found only in two specific intervals (4630–3890 and 2040–560 cal a BP). Hydrochemical and isotope data from inflowing streams and lake waters indicate that evaporitic processes play a dominant role in the precipitation of carbonates within this lake. Isotopic (δ18O and δ13C) studies on the evaporative gaylussite crystals and residual bulk carbonates (calcite) from the long core show that evaporation is the major control on δ18O enrichment in both the minerals. However, in case of δ13C additional mechanisms, for example methanogenesis (gaylussite) and phytoplankton productivity (calcium carbonate), play an additional important role in some intervals. We also discuss the relevance of our investigation for palaeoclimate reconstruction and late Holocene monsoon variability.