10.6084/m9.figshare.3453722.v1
Michael A. Pointon
Michael A.
Pointon
David M. Chew
David M.
Chew
Maria Ovtcharova
Maria
Ovtcharova
George D. Sevastopulo
George D.
Sevastopulo
Bernard Delcambre
Bernard
Delcambre
High-precision U–Pb zircon CA-ID-TIMS dates from western European late Viséan bentonites
Geological Society of London
2016
stratigraphical age
100 ka Milankovitch cycle
cycle periodicity values
bentonite
Palaeozoic glaciation
Milankovitch frequency
Midland Valley
Warnantian parasequences exhibit
Mississippian time scale
Warnantian times
zircon
ionization mass spectrometry dates
Clyde Plateau Volcanic Formation
Vis éan
Geology
2016-06-21 11:38:17
Dataset
https://geolsoc.figshare.com/articles/dataset/High-precision_U_Pb_zircon_CA-ID-TIMS_dates_from_western_European_late_Vis_an_bentonites/3453722
<p>Three new U–Pb zircon chemical abrasion isotope dilution thermal ionization mass spectrometry dates obtained from late Viséan
Belgian bentonites are reported and are used to estimate the periodicity of early Warnantian shallowing-upwards carbonate
parasequences that are interbedded with the dated bentonites. Early Warnantian parasequences exhibit mean cycle periodicity
values that are consistent with the <em>c</em>. 100 ka Milankovitch cycle, which is the dominant Milankovitch frequency recognized from recent Pleistocene glacial records,
and thus strengthen the arguments for (1) these sedimentary cycles being of glacio-eustatic origin and (2) the initiation
of the main phase of late Palaeozoic glaciation before the start of or during earliest Warnantian times. The new dates also
provide additional high-precision age constraints for the improved calibration of the Mississippian time scale. Using the
new dates, the stratigraphical age of the Clyde Plateau Volcanic Formation, Midland Valley of Scotland, is revised from Holkerian
to early Asbian.
</p>