Submillennial palynology and palaeoecology of the last glaciation at Taiquemó (∼50,000 cal yr, MIS 2–4) in southern Chile
Stratigraphic palynology of core HE94-2B from a mire at Taiquemó (42.17°S, 73.60°W) on Isla Grande de Chiloé is one of the most closely sampled, continuous Pleistocene records in southern South America. Chronology of the 655-cm core that extends from Marine Isotope Stage (MIS) 4 through the Lateglac...
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Published in | Quaternary science reviews Vol. 25; no. 5; pp. 446 - 454 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
01.03.2006
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Subjects | |
Online Access | Get full text |
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Summary: | Stratigraphic palynology of core HE94-2B from a mire at Taiquemó (42.17°S, 73.60°W) on Isla Grande de Chiloé is one of the most closely sampled, continuous Pleistocene records in southern South America. Chronology of the 655-cm core that extends from Marine Isotope Stage (MIS) 4 through the Lateglacial is controlled by 27 finite radiocarbon dates. Sampled at 1-cm intervals, the high temporal resolution (mean ∼85
yr
cm
−1) captures short-term palaeoecological changes and successional restabilization of plant communities.
Preponderance of Gramineae (grass) with
Nothofagus dombeyi type (southern beech) characterizing Subantarctic Parkland under a cold climate in MIS 4 was followed by a conspicuously milder interval that lasted for some ten millennia in MIS 3. Of greater frequency and diversity at this time were more thermophilic taxa associated with North Patagonian Evergreen Forest (
Podocarpus, Pilgerodendron type
, Pseudopanax, Myrtaceae). Subsequently with increasing cold and hyperhumidity,
N. dombeyi type–Gramineae assemblages that included Subantarctic Parkland indicator taxa (
Lepidothamnus, Astelia, Gaimardia) increased stepwise in MIS 2–3. Parkland maxima in MIS 2 during the Last Glacial Maximum (LGM) date to glacial advances between ∼17,800 and 33,400
cal
yr BP. On deglaciation, Lateglacial North Patagonian Evergreen Forest was subject to short-term stadial and interstadial climatic fluctuations.
The high-resolution Taiquemó pollen record details and supports previous conclusions of interhemispheric synchrony of climatic and glacial events. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0277-3791 1873-457X |
DOI: | 10.1016/j.quascirev.2005.04.008 |