Settling the Danian Astronomical Time Scale: A Prospective Global Unit Stratotype at Zumaia, Basque Basin

Dinarès-Turell, Jaume; Westerhold, Thomas; Pujalte, Victoriano; Röhl, Ursula; Kroon, Dick

doi:10.1007/978-3-319-04364-7_38

Cited by 2 publications

(2 citation statements)

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“…), and identifying amplitude or frequency modulations that are calculated based on theoretical precession and obliquity signals (e.g., Meyers, 2015). Astronomically tuned time scales have been developed for the Oligocene (Pälike et al, 2006) the Paleocene (Kuiper et al, 2008;Westerhold et al, 2008;Dinares-Turell et al, 2014;Hilgen et al, 2015), and much of the Eocene (Pälike et al, 2001;Westerhold and Röhl, 2009;Westerhold et al, 2014). However, the tuning of the EOT interval has proven to be problematic due to the scarcity of suitable carbonate-rich deep marine records, resulting in a late Eocene "gap" between 33.7 and 47.8 Ma in the astronomically tuned GPTS of the geological time scale.…”

Section: Introductionmentioning

confidence: 99%

Accuracy and precision of the late Eocene–early Oligocene geomagnetic polarity time scale

et al. 2019

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An accurate and precise geomagnetic polarity time scale is crucial to the development of a chronologic framework in which to test paleoclimatic and paleoenvironmental interpretations of marine and terrestrial records of the Eocene–Oligocene transition (EOT). The magnetic polarity patterns of relatively continuous marine and terrestrial records of the EOT have been dated using both radio-isotopic techniques and astronomical tuning, both of which can achieve a precision approaching ±30 k.y. for much of the Paleogene. However, the age of magnetic reversals between chrons C12n and C16n.2n has proved difficult to calibrate, with discrepancies of up to 250 k.y. between radio-isotopically dated and astronomically tuned marine successions, rising to 600 k.y. for comparisons with the 206Pb/238U-dated terrestrial record of the White River Group in North America. In this study, we reevaluate the magnetic polarity pattern of the Flagstaff Rim and Toadstool Geologic Park records of the White River Group (C12n–C16n.2n). Our interpretation of the Flagstaff Rim polarity record differs significantly from earlier studies, identifying a previously unreported normal polarity zone correlated to C15n, which eliminates discrepancies between the WRG and the 206Pb/238U-dated marine record of the Rupelian Global Stratotype Section and Point in the Italian Umbria-Marche basin. However, residual discrepancies persist between U-Pb–dated and astronomically tuned records of the EOT even when stratigraphic and systematic uncertainties associated with each locality and dating method are taken into account, which suggests that the uncertainties associated with astronomically tuned records of the EOT may have been underestimated.

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Section: Introductionmentioning

confidence: 99%

Accuracy and precision of the late Eocene–early Oligocene geomagnetic polarity time scale

et al. 2019

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“…As with other Paleogene hyperthermals (such as the PETM), the negative δ 13 C excursion has been attributed to the addition of huge amounts of δ 13 C depleted carbon to the ocean and atmosphere. The coincident surface water warming has been explained either by the possibility of high atmospheric greenhouse gas concentrations similar to that noted for the PETM or increased insolation due to the orbital constellation (Pc40510; Dinarès-Turell et al, 2014) i.e., changes of orbital parameters resulting in insolation changes on shorter time-scales during the upper Chron C27n (see also Bornemann et al, 2021). Additionally, the LDE falls within a time interval that shows an increased activity of the North Atlantic Igneous Province, and oceanic spreading rates and volcanic activity along the SE Greenland margin (Sinton and Duncan, 1998;Westerhold et al, 2008).…”

Section: Paleoecological and Paleoceanographic Interpretationsmentioning

confidence: 87%

Multiproxy analyses of paleoenvironmental and paleoceanographic changes during the Danian-Selandian in East Central Sinai: An integrated stable isotope and planktic foraminiferal data

et al. 2023

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Forty-three planktic foraminifera samples from the Themed section (East Central Sinai; Egypt) spanning the Zone Parvularugoglobigerina eugubina (Pα) to the Subzone Acarinina subsphaerica (P4b) have been studied. Data from δ13C, δ18O, and planktic foraminifera-based species diversity, depth habitat, preference for warm and cool surface waters, and nutrients (oligotrophic, mesotrophic, and eutrophic conditions) are used to infer paleoenvironmental changes throughout the Danian‒Selandian duration. Based on quantitative multivariate analyses (hierarchical cluster and principal component), three distinct intervals were recognized, Interval 1 (Pα‒P1b), Interval 2 (P1c‒P3a), and Interval 3 (P3a‒P4b). Interval 2 is further subdivided into three subintervals, 2a (part P1c), 2b (part P1c), and 2c (P2‒P3a). Two δ13C events are identified, Dan-C2 and Latest Danian Event (LDE) and elaborated concerning paleoenvironmental changes. During the earliest Danian planktic foraminiferal Pα Zone, moderately shallow and eutrophic conditions prevailed with cool surface waters and a shallow thermocline. Comparable conditions were still prevailing during P1a‒P1b, but with slightly deeper and mesotrophic conditions and a somewhat deeper thermocline and reduced stratification. P1b‒P1c exhibits a major shift from Eoglobigerina to Subbotina‒Parasubbotina with cooler surface waters and moderate mesotrophic conditions. For Subzone P1c (upper part), slightly mesotrophic conditions were inferred, whereas for P2‒P3a (lower part), surface water warming and thermocline shallowing events have inferred with increased oligotrophic conditions. The Latest Danian Event (mid-P3a) is marked by a dramatic negative δ13C excursion, warm waters, increased mesotrophic conditions, and enhanced stratification. The dominance of Morozovella, Acarinina, and Igorina specify warm and oligotrophic conditions for subzones P3b‒P4b.

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Settling the Danian Astronomical Time Scale: A Prospective Global Unit Stratotype at Zumaia, Basque Basin

Cited by 2 publications

References 14 publications

Accuracy and precision of the late Eocene–early Oligocene geomagnetic polarity time scale

Accuracy and precision of the late Eocene–early Oligocene geomagnetic polarity time scale

Multiproxy analyses of paleoenvironmental and paleoceanographic changes during the Danian-Selandian in East Central Sinai: An integrated stable isotope and planktic foraminiferal data

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