Palynological, geochemical, and mineralogical characteristics of the Early Jurassic Liasidium Event in the Cleveland Basin, Yorkshire, UK
Hesselbo, SP; Hudson, AJL; Huggett, JM; et al.Leng, ML; Riding, JB; Ullmann, CV
Date: 29 June 2019
Article
Journal
Newsletters on Stratigraphy
Publisher
Borntraeger Science Publishers
Publisher DOI
Abstract
A previously proposed hyperthermal episode in the Early Jurassic (mid-
Sinemurian) is investigated from the shallow marine succession at Robin Hood’s Bay,
Cleveland Basin, Yorkshire, UK. Palynological study confirms that the stratigraphical
extent of the distinctive dinoflagellate cyst Liasidium variabile corresponds very
closely ...
A previously proposed hyperthermal episode in the Early Jurassic (mid-
Sinemurian) is investigated from the shallow marine succession at Robin Hood’s Bay,
Cleveland Basin, Yorkshire, UK. Palynological study confirms that the stratigraphical
extent of the distinctive dinoflagellate cyst Liasidium variabile corresponds very
closely to the oxynotum Zone. The range of Liasidium variabile also corresponds to
an overall negative excursion in carbon-isotopes measured in bulk organic matter,
which here exhibits a double spike in the middle oxynotum Zone. Additionally,
Liasidium variabile abundances track overall transgressive-regressive facies trends
with peak abundance of dinoflagellate cysts corresponding to deepest water facies
and maximum flooding. Lithological cycles (parasequences), defined by visual
description and hand-held X-ray fluorescence analysis of powdered samples, match
previously suggested short eccentricity cycles, and allow a total duration for the
event of at least one million years to be suggested. Changes in clay mineralogy
throughout the section determined by whole rock X-ray diffraction and scanning
electron microscopy are shown to be largely related to authigenic 33 processes, and
neither support nor refute the proposition of coeval palaeoclimate changes. The
combined characteristics of the Liasidium Event described from Robin Hood’s Bay
are similar to, but much less extreme than, the Early Jurassic Toarcian Oceanic
Anoxic Event albeit, at this locality, there is no evidence for the development of
significant bottom water deoxygenation.
Camborne School of Mines
Collections of Former Colleges
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