globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12169
Scopus记录号: 2-s2.0-84949871236
论文题名:
Fossil forests in the Austral Basin (Argentina) marking a Cenomanian heterogeneous forced regressive surface
作者: Varela A.N.; Iglesias A.; Poiré D.; Zamuner A.; Richiano S.; Brea M.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2016
卷: 14, 期:3
起始页码: 293
结束页码: 313
语种: 英语
Scopus关键词: Alfisol ; Cenomanian ; fossil ; fossil record ; growth rate ; paleontology ; preservation ; sequence boundary ; stratigraphy ; tree ring ; Argentina ; Austral Basin ; Patagonia ; soil ; analysis ; Argentina ; chemistry ; forest ; fossil ; geographic and geological phenomena ; sediment ; soil ; Argentina ; Forests ; Fossils ; Geologic Sediments ; Geological Phenomena ; Soil
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences ; Environmental Science: General Environmental Science ; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: The mid-Cretaceous greenhouse period in the southern Patagonia Argentina (Austral Basin) is represented by the Mata Amarilla Formation. It is composed of three informal sections which were deposited in littoral and continental environments. The boundary between the lower and middle sections of the Mata Amarilla Formation shows a drastic reduction in accommodation/sediment supply (A/S) ratio, interpreted as a forced regressive surface. This surface is characterized by a well-developed palaeosol, associated with the extensive preservation of a podocarp-dominated fossil forest over a vast area (more than 5400 km2). Sedimentological and palaeopedological analyses, in conjunction with forest structure, tree density and growth ring analyses, indicate that the mid-Cenomanian forced regression can be distinguished as a non-uniform surface developed over a short period of time. This sequence boundary is recognized through a heterogeneous regional surface, delimited in the western part of the study area by an erosional surface generated by a large lateral channel migration recorded by sheet-like channel deposits with transported logs. By comparison, towards the eastern part of the study area, it appears as a paraconformity bounded by a very mature vertic Alfisol, which may have taken 40-100 ky to develop, and the preservation of a fossil forest in life position with a minimum age of 337 years. It is concluded that the extensive presence of these fossil forests at the same stratigraphic level in a vast region respond to changes in A/S ratio in a forced regressive surface at basin scale. © 2016 John Wiley & Sons Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85108
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作者单位: Centro de Investigaciones Geológicas, Universidad Nacional de La Plata - CONICET, La Plata, Argentina; Instituto de Investigaciones en Biodiversidad y Medioambiente, Universidad Nacional del COMAHUE - CONICET, San Carlos de Bariloche, Argentina; Deceased. División Paleobotánica, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, La Plata, Argentina; Laboratorio de Paleobotánica, Centro de Investigaciones Cientificas y Transferencia de Tecnologia a la Produccion, CICyTTP-CONICET, Entre Ríos, Argentina

Recommended Citation:
Varela A.N.,Iglesias A.,Poiré D.,et al. Fossil forests in the Austral Basin (Argentina) marking a Cenomanian heterogeneous forced regressive surface[J]. Geobiology,2016-01-01,14(3)
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