Absolute dating of the L-chondrite parent body breakup with high-precision U–Pb zircon geochronology from Ordovician limestone

Liao, Shi Yong; Huyskens, Magdalena H.; Yin, Q. Z.; Schmitz, Birger

doi:10.1016/j.epsl.2020.116442

Cited by 25 publications

(15 citation statements)

References 49 publications

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“…crassus at 467.5 ± 0.28 Ma but in the absence of any certainty in the numerical ages of the Middle Ordovician time-scale, all ages obtained here can easily be shifted downward by 2.5 Ma if the revised age of ref. 29 is proved correct in the future. It is noteworthy that besides their disagreement on absolute ages, the two studies seem to agree on the average sedimentation rate to be applied to the dated section down into the Darriwilian and Dapingian and hence the duration of conodont zones should remain the same 10 , 29 .…”

Section: Resultsmentioning

confidence: 86%

“… 29 is proved correct in the future. It is noteworthy that besides their disagreement on absolute ages, the two studies seem to agree on the average sedimentation rate to be applied to the dated section down into the Darriwilian and Dapingian and hence the duration of conodont zones should remain the same 10 , 29 .…”

Section: Resultsmentioning

confidence: 86%

“…Propagation of the age of ref. 29 downward provides an age of 469.6 ± 0.3 Ma for the Floian–Dapingian boundary. This contradicts the spline-fit ages of the base Dapingian at 471.3 Ma for a Graptolite composite and 473.9 ± 1.21 Ma for the Conodont composite of the most recent Geologic Time Scale 30 .…”

Section: Resultsmentioning

confidence: 97%

“…This mid-Ordovician time-scale derived from CRE-ages was recently challenged by recent U-Pb dating of zircon populations obtained from the same limestone bed as refs. 10 , 29 . A Bayesian age of 465.01 ± 0.26 Ma was proposed for this stratigraphic level, derived from the youngest population of overlapping zircon grains.…”

Section: Resultsmentioning

confidence: 99%

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Middle Ordovician astrochronology decouples asteroid breakup from glacially-induced biotic radiations

2021

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Meso-Cenozoic evidence suggests links between changes in the expression of orbital changes and millennia-scale climatic- and biotic variations, but proof for such shifts in orbital cyclicity farther back in geological time is lacking. Here, we report a 469-million-year-old Palaeozoic energy transfer from precession to 405 kyr eccentricity cycles that coincides with the start of the Great Ordovician Biodiversification Event (GOBE). Based on an early Middle Ordovician astronomically calibrated cyclostratigraphic framework we find this orbital change to succeed the onset of icehouse conditions by 200,000 years, suggesting a climatic origin. Recently, this icehouse was postulated to be facilitated by extra-terrestrial dust associated with an asteroid breakup. Our timescale, however, shows the meteor bombardment to post-date the icehouse by 800,000 years, instead pausing the GOBE 600,000 years after its initiation. Resolving Milankovitch cyclicity in deep time thus suggests universal orbital control in modulating climate, and maybe even biodiversity accumulation, through geological time.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

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Middle Ordovician astrochronology decouples asteroid breakup from glacially-induced biotic radiations

2021

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“…Zircons from different ash-bearing layers provide stratigraphically consistent depositional ages that range from 464.22 ± 0.37 Ma to 465.01 ± 0.26 Ma [10].…”

Section: Introductionmentioning

confidence: 98%

The Österplana Fossil Meteorites and… What Else? Terrestrial Cr-Spinels and Zircons in the Ordovician Limestones of the Thorsberg Quarry (Sweden)

et al. 2022

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In the Ordovician limestone of the Thorsberg quarry (South Sweden), about 130 meteorites have been found. Among the extraterrestrial material, several terrestrial Cr-spinels and zircons have been found too. In particular, in the interval 416–447 cm above the Arkeologen bed, terrestrial Cr-spinels, compositionally different from previous studied Cr-spinels of the same sequence, are present. Previous studies on zircon provided depositional ages that range from 464.22 ± 0.37 Ma to 465.01 ± 0.26 Ma. The trace element content of zircons suggests different possible source rocks. In fact, zircons from the oldest ash layer resemble those from dolerite, while those in the youngest layers are similar to zircons commonly found in granitoids, with more than 65% wt. SiO2. The chemistry of Cr-spinels suggests a strong alteration, so that it is difficult to assign them to a specific area, however they recall the chemistry of altered spinels from ophiolitic occurrences (among other possibilities). The geological setting of the Laurentia and Baltica areas, including the description of basalts to rhyolite association and the presence of ophiolitic slices, makes us confident about the derivation of these zircons and Cr-spinels from those areas.

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Zircon U-Pb and trace element constraints on the evolution of the Tonian (829–831 Ma) alkaline plutons within the Mercara Shear Zone, south India

et al. 2023

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Absolute dating of the L-chondrite parent body breakup with high-precision U–Pb zircon geochronology from Ordovician limestone

Cited by 25 publications

References 49 publications

Middle Ordovician astrochronology decouples asteroid breakup from glacially-induced biotic radiations

Middle Ordovician astrochronology decouples asteroid breakup from glacially-induced biotic radiations

The Österplana Fossil Meteorites and… What Else? Terrestrial Cr-Spinels and Zircons in the Ordovician Limestones of the Thorsberg Quarry (Sweden)

Zircon U-Pb and trace element constraints on the evolution of the Tonian (829–831 Ma) alkaline plutons within the Mercara Shear Zone, south India

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