Coupling of marine and continental oxygen isotope records during the Eocene-Oligocene transition

Sheldon, Nathan D.; Grimes, Stephen T.; Hooker, Jerry J.; Collinson, Margaret E.; Bugler, M.; Hren, Michael T.; Price, Gregory D.; Sutton, Paul

doi:10.1130/b31315.1

Cited by 21 publications

(19 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the interpretation of these records is subject to controversy. Further work in North America found no change in MAT but a shift in precipitation 59 , whilst those from northwest Europe may represent a change in the growing season temperature and hydrological source 19 60 . The heterogeneity in the timing and scale of change in the vegetation record through the late Eocene–early Oligocene reported here and by others complicates the idea that mammalian turnovers in Europe and Asia were a direct result of vegetation change promoted by EOT cooling 24 26 .…”

Section: Discussionmentioning

confidence: 86%

Heterogeneity in global vegetation and terrestrial climate change during the late Eocene to early Oligocene transition

Pound

Salzmann

2017

Sci Rep

125

127

View full text Add to dashboard Cite

Rapid global cooling at the Eocene – Oligocene Transition (EOT), ~33.9–33.5 Ma, is widely considered to mark the onset of the modern icehouse world. A large and rapid drop in atmospheric pCO2 has been proposed as the driving force behind extinctions in the marine realm and glaciation on Antarctica. However, the global terrestrial response to this cooling is uncertain. Here we present the first global vegetation and terrestrial temperature reconstructions for the EOT. Using an extensive palynological dataset, that has been statistically grouped into palaeo-biomes, we show a more transitional nature of terrestrial climate change by indicating a spatial and temporal heterogeneity of vegetation change at the EOT in both hemispheres. The reconstructed terrestrial temperatures show for many regions a cooling that started well before the EOT and continued into the Early Oligocene. We conclude that the heterogeneous pattern of global vegetation change has been controlled by a combination of multiple forcings, such as tectonics, sea-level fall and long-term decline in greenhouse gas concentrations during the late Eocene to early Oligocene, and does not represent a single response to a rapid decline in atmospheric pCO2 at the EOT.

show abstract

Section: Discussionmentioning

confidence: 86%

Heterogeneity in global vegetation and terrestrial climate change during the late Eocene to early Oligocene transition

Pound

Salzmann

2017

Sci Rep

125

127

View full text Add to dashboard Cite

show abstract

“…Variability in rock erodibility also potentially affects the prevalence of lateral or vertical channel incision (e.g. Montgomery, 2004;Wohl, 2008;Johnson and Finnegan, 2015) that governs both valley width and the formation of strath terraces. Because they can be indicators of tectonic, climate, and geomorphic processes, strath terraces have become critical to interpreting landscape history from rivers (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Gilbert, 1877;Hack, 1960;Wegmann and Pazzaglia, 2002;Sklar and Dietrich, 2004). Whereas paired terraces typically form owing to any of the aforementioned processes, unpaired strath terraces may also form because of autocyclic forces independent of external forcing (Bull, 1990), for example arising from cutoff dynamics in meandering bedrock channels (Finnegan and Dietrich, 2011), or variation in the physical properties of channel bed, banks, and bedload (García, 2006;Limaye and Lamb, 2014;Johnson and Finnegan, 2015).…”

Section: Introductionmentioning

confidence: 99%

The effect of lithology on valley width, terrace distribution, and bedload provenance in a tectonically stable catchment with flat‐lying stratigraphy

Keen‐Zebert

Hudson

Shepherd

et al. 2017

Earth Surf Processes Landf

View full text Add to dashboard Cite

How rock resistance or erodibility affects fluvial landforms and processes is an outstanding question in geomorphology that has recently garnered attention owing to the recognition that the erosion rates of bedrock channels largely set the pace of landscape evolution. In this work, we evaluate valley width, terrace distribution, and bedload provenance in terms of reach scale variation in lithology in the study reach and discuss the implications for landscape evolution in a catchment with relatively flat‐lying stratigraphy and very little uplift. A reach of the Buffalo National River in Arkansas was partitioned into lithologic reaches and the mechanical and chemical resistance of the main lithologies making up the catchment was measured. Valley width and the spatial distribution of terraces were compared among the different lithologic reaches. The surface grain size and provenance of coarse (2–90 mm) sediment of both modern gravel bars and older terrace deposits that make up the former bedload were measured and defined. The results demonstrate a strong impact of lithology upon valley width, terrace distribution, and bedload provenance and therefore, upon landscape evolution processes. Channel down‐cutting through different lithologies creates variable patterns of resistance across catchments and continents. Particularly in post‐tectonic and non‐tectonic landscapes, the variation in resistance that arises from the exhumation of different rocks in channel longitudinal profiles can impact local base levels, initiating responses that can be propagated through channel networks. The rate at which that response is transmitted through channels is potentially amplified and/or mitigated by differences between the resistance of channel beds and bedload sediment loads. In the study reach, variation in lithologic resistance influences the prevalence of lateral and vertical processes, thus producing a spatial pattern of terraces that reflects rock type rather than climate, regional base level change, or hydrologic variability. Copyright © 2017 John Wiley & Sons, Ltd.

show abstract

“…In the continental domain, the Palaeogene climate has mostly been studied using floral and palynologic analyses (e.g. Châteauneuf, 1980;Mosbrugger et al, 2005) but geochemical proxies has rarely been used and data remains scarce (Grimes et al, 2003(Grimes et al, , 2005Sheldon et al, 2016). It is linked on one hand to the discontinuity of the stratigraphic record, and on the other hand to the complexity of interpretation of the isotopic signal in this realm due to greater environmental fluctuations.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…The calcification occurs over one month at the end of the growing season, which corresponds to the warmer months of the year (Jones et al, 1996). For the Palaeogene, they have been successfully used as palaeoclimatic proxies, combined with other fossils (mammals), at the reduced scale of a local formation (Grimes et al, 2003(Grimes et al, , 2005Sheldon et al, 2016) but the…”

Section: Charophytesmentioning

confidence: 99%

Significance of shallow-marine and non-marine algae stable isotope (δ18O) compositions over long periods: Example from the Palaeogene of the Paris Basin

Huyghe

Emmanuel

Renard

et al. 2017

Palaeogeography, Palaeoclimatology, Palaeoecology

View full text Add to dashboard Cite

In this study, we test the potentiality of using dasycladales and charophytes, calcareous shallow-marine and non-marine algae respectively as palaeoclimatic recorders. These algae mineralize their carbonate during short periods in summer. Throughout the Palaeogene, we compare the  18 O variation of these two taxa to identify a possible common factor influencing their isotopic composition, i.e. temperatures variations, from a local environmental signal. We sampled and isotopically analyzed eight species of charophytes and seven species of dasycladales from 23 formations ranging from the Palaeocene to the Oligocene series of the Paris Basin. By comparing the  18 O of these two groups living in different environment with that of shallow-marine mollusks from a previous study, we show that temperature variations are the main factor influencing their  18 O compositions and that local environmental effects does not screen the global thermal signal. Maximum annual palaeotemperatures are calculated from the  18 O of the dasycladales and indicate by comparison with the data from mollusks previously analyzed that dasycladales species used probably mineralized their carbonate in equilibrium with seawater. Dasycladales recorded the global climatic events already known for the Palaeogene, with high temperatures reached during the Early Eocene and Middle Eocene climatic optimums and relative cooling intervals during the Lutetian, the Priabonian and the Rupelian. Charophyte gyrogonites also recorded temperature variations in their  18 O compositions but reconstituting reliable temperature values in non-marine environments is not directly possible and requires constraining  18 O of local continental water using other proxies. These promising results show that carbonates mineralized from algae constitute a reliable support for palaeoclimatic information and should be more widely used in the fossil record.

show abstract

Coupling of marine and continental oxygen isotope records during the Eocene-Oligocene transition

Abstract: Coupling of marine and continental oxygen isotope records during the Eocene-Oligocene transition Geological Society of America Bulletin, v. 1XX, no. XX/XX 1

Cited by 21 publications

References 42 publications

Heterogeneity in global vegetation and terrestrial climate change during the late Eocene to early Oligocene transition

Heterogeneity in global vegetation and terrestrial climate change during the late Eocene to early Oligocene transition

The effect of lithology on valley width, terrace distribution, and bedload provenance in a tectonically stable catchment with flat‐lying stratigraphy

Significance of shallow-marine and non-marine algae stable isotope (δ18O) compositions over long periods: Example from the Palaeogene of the Paris Basin

Contact Info

Product

Resources

About