气候变化领域集成服务门户(CCPortal): An Oligocene microthermal forest dominated by Nothofagus in Sierra Baguales; Chilean Patagonia: Response to global cooling and tectonic events

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DOI	10.1016/j.palaeo.2019.04.006
	An Oligocene microthermal forest dominated by Nothofagus in Sierra Baguales; Chilean Patagonia: Response to global cooling and tectonic events
	Gutiérrez N.M.; Pino J.P.; Le Roux J.P.; Pedroza V.; Oyarzun J.L.; Hinojosa L.F.
发表日期	2019
ISSN	0031-0182
起始页码	1
结束页码	13
卷号	528
英文摘要	A large fossil leaf assemblage (>3700 specimens)is reported from the Oligocene Río Leona Formation in the Sierra Baguales of Chilean Patagonia. The association comprises 29 species but is dominated by Nothofagus genera, which constitutes 65% of specimens. The collection can be classified as a Mixed Palaeoflora of the Austral-Antarctic association. Stratigraphic analysis of the assemblage indicates a decrease in species diversity and richness over time, which was accompanied by species turnover. Quantitative studies of foliar morphology (CLAMP, Leaf Margin Analysis)indicates cool-to-cold and dry climatic conditions, with a Mean Annual Temperature of 9.2 °C, a relatively high seasonality in temperature and precipitation, and a Mean Annual Precipitation of 931 mm. Nothofagus only became dominant in southeastern Patagonia during the Rupelian, coinciding with a marked global cooling period linked to the initiation of glaciation in Antarctica about 34 Ma. The decrease in precipitation following this event is attributed to the development of a rain shadow to the east of the rising Southern Patagonian Andes, which must have been of the order of 1000 m or more for topographic climate forcing to take effect. This contrasts with the rain shadow development east of the Andes at lower latitudes, which was mainly manifested after the middle Miocene. © 2019 Elsevier B.V.
英文关键词	Andean tectonics; Bartonian-Rupelian cooling; Paleoclimate; Río Leona Formation
语种	英语
scopus关键词	Andean orogeny; climate forcing; cooling; fossil assemblage; glaciation; leaf; Oligocene; paleobotany; paleoclimate; Rupelian; species diversity; species richness; tectonic structure; Andes; Antarctica; Patagonia; Bartonia; Nothofagus
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150934
作者单位	Departamento de Geología, FCFM, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile; Departamento de Ciencias Ecológicas, Universidad de Chile, Ñuñoa, Santiago, Chile; Centro de Excelencia en Geotermia de los Andes, Plaza Ercilla 803, Santiago, Chile; Parque Geológico y Paleontológico La Cumbre-Baguales, Km 385 Norte Ruta N° 9Magallenes, Chile; Instituto de Ecología y Biodiversidad (IEB), Santiago, Chile; Centro de Investigación, Desarrollo e Innovación de Estructuras y Materiales IDIEM, Universidad de Chile, Chile
推荐引用方式 GB/T 7714	Gutiérrez N.M.,Pino J.P.,Le Roux J.P.,et al. An Oligocene microthermal forest dominated by Nothofagus in Sierra Baguales; Chilean Patagonia: Response to global cooling and tectonic events[J],2019,528.
APA	Gutiérrez N.M.,Pino J.P.,Le Roux J.P.,Pedroza V.,Oyarzun J.L.,&Hinojosa L.F..(2019).An Oligocene microthermal forest dominated by Nothofagus in Sierra Baguales; Chilean Patagonia: Response to global cooling and tectonic events.Palaeogeography, Palaeoclimatology, Palaeoecology,528.
MLA	Gutiérrez N.M.,et al."An Oligocene microthermal forest dominated by Nothofagus in Sierra Baguales; Chilean Patagonia: Response to global cooling and tectonic events".Palaeogeography, Palaeoclimatology, Palaeoecology 528(2019).