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Algunos apuntes sobre el paleoclima en los Andes venezolanos hace 13.000 años

Author(s): Graf, K

Journal: Plantula
ISSN 1316-1547

Volume: 1;
Issue: 1;
Start page: 95;
Date: 1996;
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Keywords: Paleobotany | Paleoclimatology | Turfs | Andes | Venezuela | Neotropic.

With the purpose of studying the paleoclimate of the Venezuelan Andes, several profiles from the vicinity of the Paramo of Mucubají (Cordillera de Santo Domingo) were compared with other profiles (turfs, fluvioglacier terraces and lakes) analized by other authors ( RULL & al., 1987; SALGADO -LABOURIAU & SCHUBERT, 1977; SALGADO-LABOURIAU & al., 1988, 1992; SCHUBERT & VIVAS, 1993). The radiocarbon dating revealed maximum ages of 12,700 y.B.P., however, some of the intermediate layers are missing, those comprised between 10,500 and 500 y.B.P. The palynological analysis shows considerable contrasts between the Late Glacier and the Holocene, ranging from the dominance of the Gramineae in the first, to the Asteraceae, Umbelliferae, Caryophyllaceae and other paramo species in the second. Concerning the allochthonous pollen of the trees, the pollen of Alnus predominated in the Late Glacier, whereas in the Holocene, Podocarpus is the most abundant. The paleoclimate of the Late Glacier was known for being in general cold and dry, although there were a few brief periods of warm and humid climate, these were succeded by a dry phase, characterized by elevated temperatures and eolic erosion, conditions that impeded the formation of turf. In the Late Holocene, the climate became more humid, however, we must consider that the conditions of the area of our research were not very stable. A key of paleoclimate criterion was elaborated in order to facilitate the interpretation of the profiles
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