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Titel (primär) Palaeoenvironmental implications of evaporative gaylussite crystals from Lonar Lake, central India
Autor Anoop, A.; Prasad, S.; Plessen, B.; Basavaiah, N.; Gaye, B.; Naumann, R.; Menzel, P.; Weise, S.; Brauer, A.;
Journal / Serie Journal of Quaternary Science
Erscheinungsjahr 2013
Department CATHYD;
Band/Volume 28
Heft 4
Sprache englisch;
POF III (gesamt) T31;
Keywords evaporites;gaylussite;isotopes;Lonar Lake;monsoon
UFZ Querschnittsthemen RU2;
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.
ID 13808
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=13808
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
J. Quat. Sci. 28 (4), 349 - 359