Palaeoenvironmental implications of evaporative gaylussite crystals from Lonar Lake, central India
Version of Record online: 21 MAY 2013
© 2013 John Wiley & Sons, Ltd.
Journal of Quaternary Science
Volume 28, Issue 4, pages 349–359, May 2013
How to Cite
ANOOP, A., PRASAD, S., PLESSEN, B., BASAVAIAH, N., GAYE, B., NAUMANN, R., MENZEL, P., WEISE, S. and BRAUER, A. (2013), Palaeoenvironmental implications of evaporative gaylussite crystals from Lonar Lake, central India. J. Quaternary Sci., 28: 349–359. doi: 10.1002/jqs.2625
- Issue online: 21 MAY 2013
- Version of Record online: 21 MAY 2013
- Manuscript Accepted: 13 JAN 2013
- Manuscript Revised: 11 JAN 2013
- Manuscript Received: 23 MAR 2012
- Himalaya: Modern and Past Climates. Grant Number: HIMPAC, FOR 1380
- Lonar Lake;
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. Copyright © 2013 John Wiley & Sons, Ltd.