Direct high-precision U–Pb geochronology of the end-Cretaceous extinction and calibration of Paleocene astronomical timescales

Clyde, William C.; Ramezani, Jahandar; Johnson, Kirk R.; Bowring, Samuel A.; Jones, Matthew M.

doi:10.1016/j.epsl.2016.07.041

Cited by 87 publications

(69 citation statements)

References 51 publications

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“…If all major coal seams follow 100 kyr cycles, and starting with an age of 66·022 Ma for coal #1‐Z (Sprain et al ., ), the age of the C29r/C29n reversal in between coal #4‐X and coal #5‐X is calculated to be between ca 65·7 Ma and ca 65·6 Ma. This is consistent with 65·69 Ma (Vandenberghe et al ., ) but younger than 65·747 Ma or 65·801 Ma (Clyde et al ., ). Increased age control is needed to further assess the durations of the seven major successions.…”

Section: Discussionmentioning

confidence: 97%

“…The transition from reversed to normal polarity, between coals #X‐4 and #X‐5, is correlated with the C29r/C29n reversal with a combined 40 Ar/ 39 Ar radioisotope and astronomical age of 65·69 Ma (Vandenberghe et al ., ) and a 206 Pb/ 238 U radioisotope age of 65·747 ± 0·043 (2 σ ) Ma or 65·801 ± 0·038 (2 σ ) Ma (Clyde et al ., ). The 206 Pb/ 238 U radioisotope ages of Clyde et al .…”

Section: Discussionmentioning

confidence: 99%

“…The 206 Pb/ 238 U radioisotope ages of Clyde et al . () were measured from a volcanic ash layer preserved within the C29r/C29n reversal interval of a core ( ca 65·801 Ma) and an outcrop ( ca 65·747 Ma) in the Denver Basin (Colorado, USA). The correlation of C29r/C29n is confirmed by the 40 Ar/ 39 Ar radioisotope ages of two tephras that were dated at McGuire Creek ( ca 2 km south of Bug Creek) by Sprain et al .…”

Section: Discussionmentioning

confidence: 99%

“…The transition from reversed to normal polarity, between coals #X-4 and #X-5, is correlated with the C29r/C29n reversal with a combined 40 Ar/ 39 Ar radioisotope and astronomical age of 65Á69 Ma (Vandenberghe et al, 2012) and a 206 Pb/ 238 U radioisotope age of 65Á747 AE 0Á043 (2r) Ma or 65Á801 AE 0Á038 (2r) Ma (Clyde et al, 2016). The 206 Pb/ 238 U radioisotope ages of Clyde et al (2016) were measured from a volcanic ash layer preserved within the C29r/C29n reversal interval of a core (ca 65Á801 Ma) and an outcrop (ca 65Á747 Ma) in the Denver Basin (Colorado, USA). The correlation of C29r/C29n is confirmed by the 40 Ar/ 39 Ar radioisotope ages of two tephras that were dated at McGuire Creek (ca 2 km south of Bug Creek) by Sprain et al (2015).…”

Section: Age Control and Orbital Forcingmentioning

confidence: 95%

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Conceptual models for short‐eccentricity‐scale climate control on peat formation in a lower Palaeocene fluvial system, north‐eastern Montana (USA)

et al. 2017

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Fluvial systems in which peat formation occurs are typified by autogenic processes such as river meandering, crevasse splaying and channel avulsion. Nevertheless, autogenic processes cannot satisfactorily explain the repetitive nature and lateral continuity of many coal seams (compacted peats). The fluvial lower Palaeocene Tullock Member of the Fort Union Formation (Western Interior Williston Basin; Montana, USA) contains lignite rank coal seams that are traceable over distances of several kilometres. This sequence is used to test the hypothesis that peat formation in the fluvial system was controlled by orbitally forced climate change interacting with autogenic processes. Major successions are documented with an average thickness of 6Á8 m consisting of ca 6 m thick intervals of channel and overbank deposits overlain by ca 1 m thick coal seam units. These major coal seams locally split and merge. Time-stratigraphic correlation, using a Cretaceous-Palaeogene boundary event horizon, several distinctive volcanic ash-fall layers, and the C29r/C29n magnetic polarity reversal, shows consistent lateral recurrence of seven successive major successions along a 10 km wide fence panel perpendicular to east/south-east palaeo-flow. The stratigraphic pattern, complemented by stratigraphic age control and cyclostratigraphic tests, suggests that the major peat-forming phases, resulting in major coal seams, were driven by 100 kyr eccentricity-related climate cycles. Two distinct conceptual models were developed, both based on the hypothesis that the major peatforming phases ended when enhanced seasonal contrast, at times of minimum precession during increasing eccentricity, intensified mire degradation and flooding. In model 1, orbitally forced climate change controls the timing of peat compaction, leading to enhancement of autogenic channel avulsions. In model 2, orbitally forced climate change controls upstream sediment supply and clastic influx determining the persistence of peat-forming conditions. At the scale of the major successions, model 2 is supported because interfingering channel sandstones do not interrupt lateral continuity of major coal seams.1

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Age Control and Orbital Forcingmentioning

confidence: 95%

See 2 more Smart Citations

Conceptual models for short‐eccentricity‐scale climate control on peat formation in a lower Palaeocene fluvial system, north‐eastern Montana (USA)

et al. 2017

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“…The Danian-Selandian (Paleocene) Zumaia section is remarkable, as it was the first section to be tuned to a full integrated numerical astronomical solution (Dinarè s-Turell et al, 2003) that has been pivotal to solve the Paleocene astronomical tuning conundrum while integrating correlation to ODP/IODP oceanic records from the Atlantic and Pacific oceans (Dinarè s-Turell et al, 2014). The Paleocene astronomical time scale (ATS) has become stable and confirmed by independent U-Pb radiometric dating from volcanic ash deposits within a tightly constrained magnetobiostratigraphic framework in the Denver Basin, Colorado, USA (Clyde et al, 2016). With the aim of integrating the middle Eocene astronomical oceanic records outlined above and outcropping successions we tackle here the middle Eocene Oyambre stratigraphic section.…”

Section: Key Pointsmentioning

confidence: 99%

High‐Resolution Integrated Cyclostratigraphy From the Oyambre Section (Cantabria, N Iberian Peninsula): Constraints for Orbital Tuning and Correlation of Middle Eocene Atlantic Deep‐Sea Records

Dinarès-Turell

Martínez‐Braceras

Payros

2018

Geochem Geophys Geosyst

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The astronomical timescale accuracy generally exceeds other dating methods. Precise age models are pivotal for paleoclimatic research. The middle Eocene astronomical timescale has been poorly constrained due to scarcity of suitable records leading to the so call “Eocene astronomical timescale gap.” We present magnetic susceptibility and color proxy records from an expanded 60 m long cyclic hemipelagic succession from the Oyambre Cape in northern Spain (∼1.3 My long stratigraphic section tuned to the ∼43.1–44.4 Ma interval in the Lutetian stage). We use the strong eccentricity amplitude modulation of precession in the sedimentary record for orbital tuning. The tuned record is correlated at precession level with previously tuned Ocean Drilling Program (ODP) Site 1260 from the equatorial Atlantic (the only oceanic record that registers geochemical variations in the precession band) and to other lower resolution deep‐sea records at eccentricity level from the Southern Atlantic. Our data is consistent with a very long eccentricity minimum (driven by a ∼2.4 My periodicity) at 43.15 Ma in the orbital solutions and an age for the C20n/C20r reversal boundary at ∼43.45 Ma. However, we challenge previous correlations between these Atlantic sites (shifts of one 100 ky eccentricity cycle). Data allows to rule out correlation to either younger or older 405 ky eccentricity cycles, which constrains chronologies for the middle Eocene, emphasizing the need for consistent astrochronological frameworks involving expanded outcrops. This should aid to overcome oceanic drilling shortcomings and sedimentary complexities. Our study highlights this integration need to achieve accuracy and stability of orbital timescales underpinning Eocene paleoclimatic records.

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Radiometric Constraints on the Timing, Tempo, and Effects of Large Igneous Province Emplacement

Kasbohm

Schoene

Burgess

2021

Large Igneous Provinces

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There is an apparent temporal correlation between large igneous province (LIP) emplacement and global environmental crises, including mass extinctions. Advances in the precision and accuracy of geochronology in the past decade have significantly improved estimates of the timing and duration of LIP emplacement, mass extinction events, and global climate perturbations, and in general have supported a temporal link between them. In this chapter, we review available geochronology of LIPs and of global extinction or climate events. We begin with an overview of the methodological advances permitting improved precision and accuracy in LIP geochronology. We then review the characteristics and geochronology of 12 LIP/event couplets from the past 700 Ma of Earth history, comparing the relative timing of magmatism and global change, and assessing the chronologic support for LIPs playing a causal role in Earth's climatic and biotic crises. We find that (1) improved geochronology in the last decade has shown that nearly all well-dated LIPs erupted in < 1 Ma, irrespective of tectonic setting; (2) for well-dated LIPs with correspondingly well-dated mass extinctions, the LIPs began several hundred ka prior to a relatively short duration extinction event; and (3) for LIPs with a convincing temporal connection to mass extinctions, there seems to be no single characteristic that makes a LIP deadly. Despite much progress, higher precision geochronology of both eruptive and intrusive LIP events and better chronologies from extinction and climate proxy records will be required to further understand how these catastrophic volcanic events have changed the course of our planet's surface evolution.

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Direct high-precision U–Pb geochronology of the end-Cretaceous extinction and calibration of Paleocene astronomical timescales

Cited by 87 publications

References 51 publications

Conceptual models for short‐eccentricity‐scale climate control on peat formation in a lower Palaeocene fluvial system, north‐eastern Montana (USA)

Conceptual models for short‐eccentricity‐scale climate control on peat formation in a lower Palaeocene fluvial system, north‐eastern Montana (USA)

High‐Resolution Integrated Cyclostratigraphy From the Oyambre Section (Cantabria, N Iberian Peninsula): Constraints for Orbital Tuning and Correlation of Middle Eocene Atlantic Deep‐Sea Records

Radiometric Constraints on the Timing, Tempo, and Effects of Large Igneous Province Emplacement

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