Strontium isotope stratigraphy for the Late Cretaceous: a new curve, based on the English Chalk

Published on Jan 1, 1993in Geological Society, London, Special Publications
· DOI :10.1144/GSL.SP.1993.070.01.14
John M. McArthur45
Estimated H-index: 45
Matthew F. Thirlwall72
Estimated H-index: 72
+ 4 AuthorsAlan R. Lord3
Estimated H-index: 3
Marine 87Sr/86Sr decreases from 0.70775 in the Cenomanian to 0.70730 in the middle Turonian before increasing in a near-linear manner to >0.70775 in the early Maastrichtian. This variation has been defined using samples from the English Chalk that are closely integrated with the macrofossil and microfossil biostratigraphy of northwestern Europe. With this new isotope curve a stratigraphic resolution is attainable in correlation that is typically ±0.8 Ma for the Santonian and Campanian stages. Isotopic and biostratigraphic correlations between Dorset and Norfolk, in the UK, agree within the limit of analytical error in 87Sr/86Sr. -Authors
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