Earliest Cretaceous (late Berriasian) glendonites from Northeast Siberia revise the timing of initiation of transient Early Cretaceous cooling in the high latitudes

The studies of past climatic changes form the basis for predicting our future anthropogenic world and are among the most prominent topics in current Earth sciences. Although the Cretaceous is generally considered as a greenhouse period in Earth's history, a number of significant cooling events...

Full description

Saved in:
Bibliographic Details
Published in:Cretaceous research 2017-03, Vol.71, p.102-112
Main Authors: Rogov, Mikhail A., Ershova, Victoria B., Shchepetova, Elena V., Zakharov, Victor A., Pokrovsky, Boris G., Khudoley, Andrey K.
Format: Article
Language:English
Subjects:
Berriasian
Cooling
Glendonites
Methane
Ryazanian
Stable isotopes
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The studies of past climatic changes form the basis for predicting our future anthropogenic world and are among the most prominent topics in current Earth sciences. Although the Cretaceous is generally considered as a greenhouse period in Earth's history, a number of significant cooling events based on an array of climatic proxies have been identified. Here we present the first data on Berriasian (Ryazanian) glendonite findings from the paleontologically well dated Lower Cretaceous succession of northeastern Siberia. Based on well calibrated Buchia and ammonite biostratigraphy, the stratigraphic interval across which the glendonites occur is restricted to the late Berriasian. Stable carbon isotope (δ13C) values of the studied glendonites clearly suggest the precipitation of ikaite from marine water without any significant contamination from biogenic methane. Our results, when integrated with other available paleoclimatic proxies from elsewhere in the high latitudes, suggest a revision of the initiation of Early Cretaceous cooling in the high latitudes from the Valanginian to the late Berriasian. All known occurrences of Lower Cretaceous glendonites in both the northern and southern hemispheres are reviewed. [Display omitted] •Oldest Cretaceous glendonites ever known are discovered.•This record suggesting the Berriasian onset of the Early Cretaceous cooling.•Stratigraphic distribution of glendonites provides evidence for multiple short-time cooling events.•All Lower Cretaceous glendonite occurrences are reviewed.
ISSN:0195-6671
1095-998X
DOI:10.1016/j.cretres.2016.11.011