Show simple item record

dc.contributor.authorVignols, Rebecca M.
dc.contributor.authorValentine, Annemarie M.
dc.contributor.authorFinlayson, Alana G.
dc.contributor.authorHarper, Elizabeth M.
dc.contributor.authorSchöne, Bernd R.
dc.contributor.authorLeng, Melanie J.
dc.contributor.authorSloane, Hilary J.
dc.contributor.authorJohnson, Andrew L. A.
dc.date.accessioned2019-01-22T14:24:32Z
dc.date.available2019-01-22T14:24:32Z
dc.date.issued2018-05-24
dc.identifier.citationBradshaw, J. et al. (2018). Marine climate and hydrography of the Coralline Crag (early Pliocene, UK): isotopic evidence from 16 benthic invertebrate taxa. Available at: https://www.sciencedirect.com/science/article/pii/S0009254118302717?via%3Dihub (Accessed: 22 Jan 2019). DOI: 10.1016/j.chemgeo.2018.05.034en
dc.identifier.issn00092541
dc.identifier.doi10.1016/j.chemgeo.2018.05.034
dc.identifier.urihttp://hdl.handle.net/10545/623343
dc.description.abstractThe taxonomic composition of the biota of the Coralline Crag Formation (early Pliocene, eastern England) provides conflicting evidence of seawater temperature during deposition, some taxa indicating cool temperate conditions by analogy with modern representatives or relatives, others warm temperate to subtropical/tropical conditions. Previous isotopic (δ18O) evidence of seasonal seafloor temperatures from serial ontogenetic sampling of bivalve mollusk shells indicated cool temperate winter (< 10 °C) and/or summer (< 20 °C) conditions but was limited to nine profiles from two species, one ranging into and one occurring exclusively in cool temperate settings at present. We supplement these results with six further profiles from the species concerned and supply seven more from three other taxa (two supposedly indicative of warm waters) to provide an expanded and more balanced database. We also supply isotopic temperature estimates from 81 spot and whole-shell samples from these five taxa and 11 others, encompassing ‘warm’, ‘cool’ and ‘eurythermal’ forms by analogy with modern representatives or relatives. Preservation tests show no shell alteration. Subject to reasonable assumptions about water δ18O, the shell δ18O data either strongly indicate or are at least consistent with cool temperate seafloor conditions. The subtropical/tropical conditions suggested by the presence of the bryozoan Metrarabdotos did not exist. Microgrowth-increment and δ13C evidence indicate summer water-column stratification during deposition of the Ramsholt Member, unlike in the adjacent southern North Sea at present (well mixed due to shallow depth and strong tidal currents). Summer maximum surface temperature was probably about 5 °C above seafloor temperature and thus often slightly higher than now (17–19 °C rather than 16–17 °C), but only sometimes in the warm temperate range. Winter minimum surface temperature was below 10 °C and possibly the same as at present (6–7 °C). An expanded surface temperature range compared to now may reflect withdrawal of oceanic heat supply in conjunction with higher global temperature.
dc.description.sponsorshipBritish Geological Survey (BUFI S157), NERC Isotope Geoscience Facilities (IP-1155- 1109)en
dc.language.isoenen
dc.publisherElsevieren
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S0009254118302717en
dc.relation.urlhttp://nora.nerc.ac.uk/id/eprint/521837/
dc.relation.urlhttp://eprints.esc.cam.ac.uk/id/eprint/4295
dc.rightsArchived with thanks to Chemical Geologyen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectCoralline Cragen
dc.subjectPlioceneen
dc.subjectPaleotemperatureen
dc.subjectOxygen isotope thermometryen
dc.subjectUniformitarianismen
dc.titleMarine climate and hydrography of the Coralline Crag (early Pliocene, UK): isotopic evidence from 16 benthic invertebrate taxa.en
dc.typeArticleen
dc.typeResearch Reporten
dc.contributor.departmentUniversity of Derbyen
dc.contributor.departmentUniversity of Cambridgeen
dc.contributor.departmentUniversity of Mainzen
dc.contributor.departmentBritish Geological Surveyen
dc.identifier.journalChemical Geologyen
dc.dateAccepted2018-05-21
dc.dateAccepted2018-05-21
dc.dateAccepted2018-05-21
dc.dateAccepted2018-05-21
dc.dateAccepted2018-05-21
dc.dateAccepted2108-05-21
dc.dateAccepted2018-05-21
html.description.abstractThe taxonomic composition of the biota of the Coralline Crag Formation (early Pliocene, eastern England) provides conflicting evidence of seawater temperature during deposition, some taxa indicating cool temperate conditions by analogy with modern representatives or relatives, others warm temperate to subtropical/tropical conditions. Previous isotopic (δ18O) evidence of seasonal seafloor temperatures from serial ontogenetic sampling of bivalve mollusk shells indicated cool temperate winter (< 10 °C) and/or summer (< 20 °C) conditions but was limited to nine profiles from two species, one ranging into and one occurring exclusively in cool temperate settings at present. We supplement these results with six further profiles from the species concerned and supply seven more from three other taxa (two supposedly indicative of warm waters) to provide an expanded and more balanced database. We also supply isotopic temperature estimates from 81 spot and whole-shell samples from these five taxa and 11 others, encompassing ‘warm’, ‘cool’ and ‘eurythermal’ forms by analogy with modern representatives or relatives. Preservation tests show no shell alteration. Subject to reasonable assumptions about water δ18O, the shell δ18O data either strongly indicate or are at least consistent with cool temperate seafloor conditions. The subtropical/tropical conditions suggested by the presence of the bryozoan Metrarabdotos did not exist. Microgrowth-increment and δ13C evidence indicate summer water-column stratification during deposition of the Ramsholt Member, unlike in the adjacent southern North Sea at present (well mixed due to shallow depth and strong tidal currents). Summer maximum surface temperature was probably about 5 °C above seafloor temperature and thus often slightly higher than now (17–19 °C rather than 16–17 °C), but only sometimes in the warm temperate range. Winter minimum surface temperature was below 10 °C and possibly the same as at present (6–7 °C). An expanded surface temperature range compared to now may reflect withdrawal of oceanic heat supply in conjunction with higher global temperature.


Files in this item

Thumbnail
Name:
Publisher version
Thumbnail
Name:
Vignols et al. 2018 unpaginated.pdf
Size:
6.564Mb
Format:
PDF
Description:
Online (unpaginated) version

This item appears in the following Collection(s)

Show simple item record

Archived with thanks to Chemical Geology
Except where otherwise noted, this item's license is described as Archived with thanks to Chemical Geology