Late Pleistocene–Holocene environments in Valle Carbajal, Tierra del Fuego, Argentina |
| |
| Authors: | Ana María Borromei Andrea Coronato Mirta Quattrocchio Jorge Rabassa Silvia Grill Claudio Roig |
| |
| Institution: | aCONICET, Departamento de Geología, Universidad Nacional del Sur, San Juan 670, 8000 Bahía Blanca, Argentina;bLaboratorio de Geología del Cuaternario, CADIC-CONICET, C.C. 92, 9410 Ushuaia, Tierra del Fuego, Argentina;cUniversidad Nacional de la Patagonia-San Juan Bosco, Darwin y Canga, 9410 Ushuaia, Tierra del Fuego, Argentina |
| |
| Abstract: | The authors discuss Late Pleistocene–Holocene depositional environments in one of the Fuegian Andes valleys on the basis of palynological, geomorphological, and sedimentological analyses from two sites located near the Beagle Channel. The results obtained at these localities reinforce and refine the Late Pleistocene–Holocene climatic pattern previously recorded there. A colder period, associated with the Younger Dryas stadial event, is suggested by low Nothofagus pollen frequency, and communities of grass, low scrub, and shrub heath expanded into the low/middle slopes (10,310 14C yr BP). By ca. 9500 14C yr BP, warmer and drier conditions occurred, as evidenced by the development of open-grown vegetation in the valley floors (pollen zone O-3), followed by the expansion of open Nothofagus woodland (pollen zone O-2) in the middle Holocene. The milder climate subsequently changed, as indicated by the spreading of the closed forest and mire (pollen zone O-1), to more humid and cooler conditions during the last ca. 5000 yr BP. |
| |
| Keywords: | Palynology Geomorphology Sedimentology Paleoenvironment Paleoclimate Late Pleistocene– Holocene Valle Carbajal Tierra del FuegoPalabras claves: Palinologí a Geomorfologí a Sedimentologí a Paleoambiente Paleoclima Pleistoceno Tardí o– Holoceno Valle Carbajal Tierra del Fuego |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
