Millennial hydrological variability during the MIS3-2 in a lowland freshwater ecosystem of the northern Neotropics ...
We inferred environmental changes in the northern Neotropics using geochemical and mineralogical data from the sediment record of Lake Petén Itzá (Guatemala), covering the Marine Isotope Stages (MIS) 3 (57-29 cal ka BP) and 2 (29-15 cal ka BP). Our study focused on past changes in runoff, lake evapo...
| Main Authors: | , , , , , |
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| Format: | Text |
| Language: | English |
| Published: |
Deutsche Geologische Gesellschaft - Geologische Vereinigung e.V. (DGGV)
2022
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.48380/h7s6-nm25 https://www.dggv.de/e-publikationen/millennial-hydrological-variability-during-the-mis3-2-in-a-lowland-freshwater-ecosystem-of-the-northern-neotropics |
| Summary: | We inferred environmental changes in the northern Neotropics using geochemical and mineralogical data from the sediment record of Lake Petén Itzá (Guatemala), covering the Marine Isotope Stages (MIS) 3 (57-29 cal ka BP) and 2 (29-15 cal ka BP). Our study focused on past changes in runoff, lake evaporation, organic matter sources and changes in redox conditions associated with water-level variations. Wet conditions, higher primary productivity and anoxic bottom waters were inferred for MIS3. The transition from MIS3 to MIS2 (39.0-23.0 cal ka BP) was characterized by increasing lake evaporation and oxic bottom waters, possibly associated with lower water-levels. These conditions reversed during the Last Glacial Maximum (23.0-18.0 cal ka BP) when our data suggest higher runoff and lake productivity and a return to anoxic bottom waters as a result of rising water-levels. Our high-resolution geochemical record reveals the presence of short-term climate stages globally known as Heinrich Stadials (HS), Greenland ... |
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