Journal
EARTH AND PLANETARY SCIENCE LETTERS
Volume 548, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.epsl.2020.116475
Keywords
cyclostratigraphy; core scanning XRF; Alum Shale; SPICE event; Earth-Moon distance; Furongian
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Funding
- Carlsberg Foundation [CF16-0876]
- Danish Council for Independent Research [DFF - 7014-00295]
- Geocenter Denmark Grant [2015-5, 2017-3]
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We report evidence for Milankovitch cycles in two drill cores from the Cambro-Ordovician Alum Shale Formation of Scandinavia. The signal is preserved in elemental abundances recorded at high stratigraphic resolution by core scanning XRF analysis (0.2 mm resolution). The new data enable us to establish a floating timeline calibrated to the stable 405 kyr eccentricity cycle for a similar to 8.7 Myr interval across the Miaolingian-Furongian boundary. This interval spans the Steptoean Positive Carbon Isotope Excursion (SPICE), which is recorded in the delta C-13(org) in the studied drill cores. We calculate the durations of the Olenus Superzone to 3.4 +/- 0.2 Myr, the Parabolina Superzone to 1.9 +/- 0.3 Myr, the Leptoplastus Superzone to 0.33 +/- 0.18 Myr, the Protopeltura Superzone to 0.51 +/- 0.20 Myr, and the SPICE event straddling the Paibian and lower main part of the Jiangshanian Stage to 3.0 +/- 0.2 Myr. The sedimentation rate shows similar trends at both drilling locations and is inversely correlated to eustatic sea level changes in certain time intervals, opening tantalizing new prospects of using cyclostratigraphic analyses of shales to track eustatic sea level variations. The identification of obliquity cycles enables us to calculate the Cambrian Earth-Moon distance as well as the day length at similar to 493 Ma to 368.9 +/- 2.3. 10(6) m and 21.78 +/- 0.29 hr, respectively. (C) 2020 Elsevier B.V. All rights reserved.
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