Centennial to decadal vegetation community changes linked to orbital and solar forcing during the Dan-C2 hyperthermal event
2017; Geological Society of London; Volume: 174; Issue: 6 Linguagem: Inglês
10.1144/jgs2017-022
ISSN2041-479X
AutoresDavid W. Jolley, Robert J. Daly, Alena Ebinghaus, David B. Kemp, I. Gilmour, Conall Mac Niocaill, S. P. Kelley,
Tópico(s)Plant Water Relations and Carbon Dynamics
ResumoFormed close to the K–Pg boundary, the Boltysh meteorite crater, Ukraine, preserves >400 m of lacustrine sedimentary rocks that include a record of the early Danian Dan-C2 hyperthermal event. Abundant pollen, spores and algae recovered from these sediments have yielded a cyclic record of plant ecology change paced by c . 21 kyr orbital precession cycles. New, higher resolution sampling across the inception of the Dan-C2 hyperthermal event has identified oscillations in vegetation community ecology at sub-orbital periods of c . 2 kyr, c . 200 years and c . 11 years. These are consistent with possible Hallstatt, DeVreis–Suess and Schwabe solar cycles, respectively. Rapid regime shift from savanna to a mesic forest ecosystem was paced by c . 21 kyr precession, with the shift probably occurring in <200 years. Prior to regime shift, c . 2 kyr (i.e. possible Hallstatt) oscillations between mesic- and winterwet-dominated plant communities increased in intensity, suggestive of ecological flickering. Supplementary material: Detrended correspondence and changepoint analysis, palynological frequency data for DCA groups and core photographs are available at https://doi.org/10.6084/m9.figshare.c.3803893
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