Middle Jurassic vegetation dynamics from allochthonous palynological assemblages: An example from a marginal marine depositional setting; Lajas Formation, Neuquen Basin, Argentina

Stephen Stukins, David W. Jolley, Duncan McIlroy, Adrian J. Hartley

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Middle Jurassic marginal marine sediments from four successions within the Lajas Formation, Neuquen 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 Neuquen 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. (C) 2013 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)117-176
Number of pages60
JournalPalaeogeography Palaeoclimatology Palaeoecology
Volume392
Early online date19 Sep 2013
DOIs
Publication statusPublished - 15 Dec 2013

Keywords

  • Middle Jurassic
  • vegetation dynamics
  • correspondence analysis
  • palynology
  • Neuquen Basin
  • Greenland ice-sheet
  • Late Pliocene Greenland
  • West Greenland
  • surface climatology
  • model
  • glaciation
  • uplift
  • erosion
  • earth
  • Scandinavia

Cite this

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title = "Middle Jurassic vegetation dynamics from allochthonous palynological assemblages: An example from a marginal marine depositional setting; Lajas Formation, Neuquen Basin, Argentina",
abstract = "Middle Jurassic marginal marine sediments from four successions within the Lajas Formation, Neuquen 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 Neuquen 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. (C) 2013 Elsevier B.V. All rights reserved.",
keywords = "Middle Jurassic, vegetation dynamics, correspondence analysis, palynology, Neuquen Basin, Greenland ice-sheet, Late Pliocene Greenland, West Greenland, surface climatology, model, glaciation, uplift, erosion, earth, Scandinavia",
author = "Stephen Stukins and Jolley, {David W.} and Duncan McIlroy and Hartley, {Adrian J.}",
year = "2013",
month = "12",
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doi = "10.1016/j.palaeo.2013.09.002",
language = "English",
volume = "392",
pages = "117--176",
journal = "Palaeogeography Palaeoclimatology Palaeoecology",
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TY - JOUR

T1 - Middle Jurassic vegetation dynamics from allochthonous palynological assemblages

T2 - An example from a marginal marine depositional setting; Lajas Formation, Neuquen Basin, Argentina

AU - Stukins, Stephen

AU - Jolley, David W.

AU - McIlroy, Duncan

AU - Hartley, Adrian J.

PY - 2013/12/15

Y1 - 2013/12/15

N2 - Middle Jurassic marginal marine sediments from four successions within the Lajas Formation, Neuquen 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 Neuquen 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. (C) 2013 Elsevier B.V. All rights reserved.

AB - Middle Jurassic marginal marine sediments from four successions within the Lajas Formation, Neuquen 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 Neuquen 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. (C) 2013 Elsevier B.V. All rights reserved.

KW - Middle Jurassic

KW - vegetation dynamics

KW - correspondence analysis

KW - palynology

KW - Neuquen Basin

KW - Greenland ice-sheet

KW - Late Pliocene Greenland

KW - West Greenland

KW - surface climatology

KW - model

KW - glaciation

KW - uplift

KW - erosion

KW - earth

KW - Scandinavia

U2 - 10.1016/j.palaeo.2013.09.002

DO - 10.1016/j.palaeo.2013.09.002

M3 - Article

VL - 392

SP - 117

EP - 176

JO - Palaeogeography Palaeoclimatology Palaeoecology

JF - Palaeogeography Palaeoclimatology Palaeoecology

SN - 0031-0182

ER -