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| Titel |
Mid-Tertiary paleoenvironments in Thailand: pollen evidence |
| VerfasserIn |
P. Sepulchre, D. Jolly, S. Ducrocq, Y. Chaimanee, J.-J. Jaeger, A. Raillard |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 6, no. 4 ; Nr. 6, no. 4 (2010-07-23), S.461-473 |
| Datensatznummer |
250003654
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| Publikation (Nr.) |
 copernicus.org/cp-6-461-2010.pdf |
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| Zusammenfassung |
| Only few well-dated records document the evolution of Southeast Asian
paleoenvironments during the Cenozoic. Here we analyse continental pollen
assemblages from Late Oligocene and Miocene fossil sites of Thailand. In
agreement with previous studies, palynoflora from the Oligocene suggests
warm temperate forested habitats at 24–26 Ma, whereas Middle Miocene
assemblages are made of thermophilous taxa. This change can be linked to the
major climate reorganization that brought warmer and wetter conditions over
Southeast Asia around 22 Ma. This study also provides the first submillional
records from the Middle Miocene of Thailand. Thirteen samples of lignite
layers from the sivaladapid-bearing Mae Moh site, dated between 13.3 and
13.1 Ma, and six samples from the hominoid-bearing Chiang Muan deposit,
dated between 12.4 and 12.2 Ma, document oscillations between tropical
woodlands and grasslands in northern Thailand. These pollen records likely
reflect climate variations linked to insolation variations. Late Miocene
palynological assemblages from Khorat, northeastern Thailand, document
fluviolacustrine paleoenvironments alternatively covered by thermophilous
trees and grasslands. These records show that both sivaladapids and early
hominoids from Thailand have evolved in tropical environments with high
variability in the vegetation cover. |
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