Increased continental weathering flux during orbital-scale sea-level highstands: Evidence from Nd and O isotope trends in Middle Pennsylvanian cyclic carbonates

Theiling, Bethany; Elrick, Maya; Asmerom, Yemane

doi:10.1016/j.palaeo.2012.04.017

Cited by 14 publications

(9 citation statements)

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“…These cycles were accompanied by moisture fluctuations and associated variations in sediment transport patterns (Rueger 1996;Soreghan et al 2002;Theiling et al 2012), similar in kind, if not in detail, to those in the central Pangean coal basins. Such fluctuations should be expected to have affected the extent and location of wet and dry floras on the landscape, even in these consistently seasonal parts of western Pangea.…”

Section: Fate Of the Wetland Flora During Dry-climate Intervalsmentioning

confidence: 96%

“…Confounding data that such models generally do not address include paleosols indicative of long periods of seasonal drought (figs. 4, 5) located between many coal beds (Tandon andGibling 1994, 1997;Driese and Ober 2005;Rosenau et al 2013aRosenau et al , 2013b or changes in sedimentological patterns linked mechanistically to background climate regimes (Calder 1994;Batson and Gibling 2002;Cecil and Dulong 2003;Theiling et al 2012;Opluštil et al 2013a).…”

Section: Fate Of the Wetland Flora During Dry-climate Intervalsmentioning

confidence: 99%

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Wetland-Dryland Vegetational Dynamics in the Pennsylvanian Ice Age Tropics

DiMichele¹

2014

International Journal of Plant Sciences

158

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Premise of research. The Late Paleozoic Ice Age was the last extensive pre-Pleistocene ice age. It includes many climate changes of different intensities, permitting examination of many and varied biotic responses. The tropical Pennsylvanian Subperiod, usually visualized as one vast wetland coal forest, in fact also was dominated, periodically, by seasonally dry vegetation that, in turn, covered most of the central and western Pangean supercontinent. Equatorial wetland and dryland biomes oscillated during single glacial-interglacial cycles. This recognition changes understanding of the Coal Age tropics; examination of their spatiotemporal patterns indicates that these vegetation types responded differently to global environmental disturbances and long-term trends and points to potentially different underlying controls on evolutionary histories of their component lineages.Methodology. This study is based on the published literature and on examination of geological exposures and fossil floras, mainly from North America but also from other parts of the world.Pivotal results. Wetlands and seasonally dry habitats were equally part of the Coal Age Pangean tropics. They dominated these landscapes at different times, under different climatic regimes. Wetland vegetation was likely forced into refugia during seasonally dry (subhumid to semiarid) parts of glacial-interglacial cycles; it reemerged/reassembled during wet (humid to perhumid) periods. Seasonally dry vegetation resided permanently in areas of western and central Pangea and in microhabitats within the Central Pangean Mountains. Both floras had lower biodiversity than modern floras in similar habitats. The wetland flora species pool was more phylogenetically disparate than any modern vegetation. In contrast, seasonally dry floras were dominated by seed plants. These biomes responded differently to acute environmental changes and chronic long-term aridification.Conclusions. From ecological or evolutionary perspectives, the present-day world is but one possibility. Lower-diversity worlds such as the late Paleozoic, with a rich spectrum of environmental variations, offer insights into relationships between organisms and environments that expand understanding of these phenomena and enlarge our sense of what is possible or probable as we look to the future.

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Section: Fate Of the Wetland Flora During Dry-climate Intervalsmentioning

confidence: 96%

Section: Fate Of the Wetland Flora During Dry-climate Intervalsmentioning

confidence: 99%

Wetland-Dryland Vegetational Dynamics in the Pennsylvanian Ice Age Tropics

DiMichele¹

2014

International Journal of Plant Sciences

158

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“…Permian volcanism was farther removed from the Anadarko Basin, but tephras (likely from Permian arc(s) of northwestern Mexico) are well recognized in the youngest Permian strata here (Tabor et al, 2011;Geissman et al, 2012) and have been long recognized by industry geologists in the Upper Pennsylvanian and Permian sections of the nearby Permian Basin in western Texas (personal communication, E. Kvale, 2015;S. Ruppel, 2016;Tian et al, 2020). High-resolution chemical abrasion ID-TIMS zircon geochronology can be employed to provide essential absolute ages, aid in correlations, and constrain sedimentation rates.…”

Section: Dating Potentialmentioning

confidence: 82%

“…Evaporites preserve continental temperatures and brine compositions at temporal resolutions as fine as diurnal (e.g., Benison and Goldstein, 1999;Zambito and Benison, 2013). Cyclothems preserve an archive of glacial-interglacial variations from which we can potentially extract paleotemperature, ice-volume variations, and continental weathering flux (e.g., Elrick and Scott, 2010;Theiling et al, 2012;Elrick et al, 2013). Proglacial and associated deposits establish the former extent and nature of glaciation.…”

Section: Suitability Of Archives and Indicatorsmentioning

confidence: 99%

“…Permian strata of the Anadarko Basin have been dated with invertebrate as well as vertebrate fauna, palynology, chemostratigraphy, magnetostratigraphy, and geochronology (tephras), with much work occurring relatively recently (e.g., Denison et al, 1998;Steiner, 2006;Tabor et al, 2011;Geissman et al, 2012;Foster, 2013;Tian et al, 2020). The strata in Permian basins of France accumulated in close proximity to major volcanic centers and thus contain abundant, dateable ash beds (e.g., Bruguier et al, 2003;Michel et al, 2015).…”

Section: Dating Potentialmentioning

confidence: 99%

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Report on ICDP Deep Dust workshops: probing continental climate of the late Paleozoic icehouse–greenhouse transition and beyond

et al. 2020

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Abstract. Chamberlin and Salisbury's assessment of the Permian a century ago captured the essence of the period: it is an interval of extremes yet one sufficiently recent to have affected a biosphere with near-modern complexity. The events of the Permian – the orogenic episodes, massive biospheric turnovers, both icehouse and greenhouse antitheses, and Mars-analog lithofacies – boggle the imagination and present us with great opportunities to explore Earth system behavior. The ICDP-funded workshops dubbed “Deep Dust,” held in Oklahoma (USA) in March 2019 (67 participants from nine countries) and Paris (France) in January 2020 (33 participants from eight countries), focused on clarifying the scientific drivers and key sites for coring continuous sections of Permian continental (loess, lacustrine, and associated) strata that preserve high-resolution records. Combined, the two workshops hosted a total of 91 participants representing 14 countries, with broad expertise. Discussions at Deep Dust 1.0 (USA) focused on the primary research questions of paleoclimate, paleoenvironments, and paleoecology of icehouse collapse and the run-up to the Great Dying and both the modern and Permian deep microbial biosphere. Auxiliary science topics included tectonics, induced seismicity, geothermal energy, and planetary science. Deep Dust 1.0 also addressed site selection as well as scientific approaches, logistical challenges, and broader impacts and included a mid-workshop field trip to view the Permian of Oklahoma. Deep Dust 2.0 focused specifically on honing the European target. The Anadarko Basin (Oklahoma) and Paris Basin (France) represent the most promising initial targets to capture complete or near-complete stratigraphic coverage through continental successions that serve as reference points for western and eastern equatorial Pangaea.

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The intensity of chemical weathering: Geochemical constraints from marine detrital sediments of Triassic age in South China

Zhao

Zheng

2015

Chemical Geology

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Increased continental weathering flux during orbital-scale sea-level highstands: Evidence from Nd and O isotope trends in Middle Pennsylvanian cyclic carbonates

Cited by 14 publications

References 91 publications

Wetland-Dryland Vegetational Dynamics in the Pennsylvanian Ice Age Tropics

Wetland-Dryland Vegetational Dynamics in the Pennsylvanian Ice Age Tropics

Report on ICDP Deep Dust workshops: probing continental climate of the late Paleozoic icehouse–greenhouse transition and beyond

The intensity of chemical weathering: Geochemical constraints from marine detrital sediments of Triassic age in South China

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