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| Titel |
Palaeoenvironmental implications of evaporative Gaylussite crystals from Lonar lake, Central India |
| VerfasserIn |
Ambili Anoop, Sushma Prasad, Birgit Plessen, Nathani Basavaiah, Birgit Gaye, Rudolf Naumann, Philip Menzel, Stephen Weise, Achim Brauer |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250078644
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| Zusammenfassung |
| 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 during (4630-3890 and 2040-560 cal. a BP). Hydrochemical
and isotope data from inflowing streams and lake waters indicates 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, incase of δ13C additional mechanisms e.g., organic recycling
in gaylussite and phytoplankton triggered δ13C enrichment in calcium carbonate
also play an important role in some intervals. We also discuss the relevance of our
investigation in palaeoclimate reconstruction and late Holocene monsoon variability. |
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