DOI: 10.1016/j.palaeo.2013.09.002
论文题名: Middle Jurassic vegetation dynamics from allochthonous palynological assemblages: An example from a marginal marine depositional setting; Lajas Formation, Neuquén Basin, Argentina
作者: Stukins S. ; Jolley D.W. ; McIlroy D. ; Hartley A.J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 392 起始页码: 117
结束页码: 127
语种: 英语
英文关键词: Correspondence analysis
; Middle Jurassic
; Neuquén Basin
; Palynology
; Vegetation dynamics
英文摘要: Middle Jurassic marginal marine sediments from four successions within the Lajas Formation, Neuquén Basin, Argentina, were analysed to establish their palynofloral composition. The palynofloras, mostly of terrestrial origin, are characterised by a dominance of Classopollis spp. and common Pityosporites spp.; Deltoidospora spp.; Araucariaceae and inaperturate pollen. Correspondence analysis performed on the palynomorph assemblages derived ecological groupings characteristic of a number of palaeoenvironments from coastal/deltaic, river margins and floodplains, to higher altitude arid forests. The ecological groupings differ between the four studied successions indicating a dynamic ecosystem. Delta top depositional settings have ecological groupings characteristic of mid-late seral communities, whereas delta front and bayfill depositional settings have ecological groupings displaying early-mid seral communities. This study discusses the taphonomic and palaeoecological reasons for these changes in palaeoecological grouping.The relationships between natural ecological groupings of taxa determined using correspondence analysis provide evidence for the first order drivers of vegetation dynamics. Water availability and environmental stress (substrate disturbance) are proposed as the most important drivers of palaeofloral seral succession during the Middle Jurassic of the Neuquén Basin. This relationship between floral communities and their palaeoenvironment can be related to the ecological parameters of modern floras suggesting that similar ecological drivers control palaeofloral assemblages as far back, at least, as the Middle Jurassic.The process used herein provides a thorough methodology of understanding floral palaeoecologies and drivers of seral succession in plant communities from allochthonous materials in marginal marine depositional settings. From this, a greater understanding of the depositional environment can be derived through the appreciation of taphonomic processes.© 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69542
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth Sciences, The Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom; Department of Geology and Petroleum Geology, King's College, Meston Building, Aberdeen AB24 3UE, United Kingdom; Department of Earth Sciences, Memorial University of Newfoundland, St John's, Newfoundland A1B 3X5, Canada
Recommended Citation:
Stukins S.,Jolley D.W.,McIlroy D.,et al. Middle Jurassic vegetation dynamics from allochthonous palynological assemblages: An example from a marginal marine depositional setting; Lajas Formation, Neuquén Basin, Argentina[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,392