Unravelling Middle to Late Jurassic palaeoceanographic and palaeoclimatic signals in the Hebrides Basin using belemnite clumped isotope thermometry

Madeleine Vickers; Alvaro Fernandez; Stephen P. Hesselbo; Gregory D. Price; Stefano M. Bernasconi; Stefanie Lode; Clemens Vinzenz Ullmann; Nicolas Thibault; Iben Winther Hougård; Christoph Korte

doi:10.1016/j.epsl.2020.116401

Unravelling Middle to Late Jurassic palaeoceanographic and palaeoclimatic signals in the Hebrides Basin using belemnite clumped isotope thermometry

Madeleine Vickers^*, Alvaro Fernandez, Stephen P. Hesselbo, Gregory D. Price, Stefano M. Bernasconi, Stefanie Lode, Clemens Vinzenz Ullmann, Nicolas Thibault, Iben Winther Hougård, Christoph Korte

^*Corresponding author for this work

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Research output: Contribution to journal › Article › Academic › peer-review

Abstract

Clumped isotope based temperature estimates from exceptionally well-preserved belemnites from Staffin
Bay (Isle of Skye, Scotland) reveal that seawater temperatures throughout the Middle-Late Jurassic
were significantly warmer than previously reconstructed by conventional oxygen isotope thermometry.
We demonstrate here that this underestimation by oxygen isotope thermometry was likely due to a)
using the incorrect calcite thermometry equation for belemnite temperature reconstructions and b) by
incorrectly estimating the seawater δ18O (δ18Osw) for the Hebrides Basin. Our data suggests that the
fractionation factor for oxygen isotopes in belemnites from seawater was closer to that of slow-growing
abiogenic calcites than that of other marine calcifying organisms. Our clumped isotope temperatures
are used to reconstruct δ18Osw trends across the Callovian–Kimmeridgian in the Hebrides Basin. The
δ18Osw varied significantly in the Hebrides Basin throughout this interval, possibly as a result of changing
currents through the Laurasian seaway. Trends in temperature and δ18Osw are compared to published
palaeoceanographic studies to shed light on changing palaeoceanography in the Tethyan and Boreal
realms throughout the Middle–Late Jurassic.

Original language	English
Article number	116401
Pages (from-to)	1-10
Journal	Earth and Planetary Science Letters
Volume	546
DOIs	https://doi.org/10.1016/j.epsl.2020.116401
Publication status	Published - 15 Sept 2020

Keywords

Jurassic palaeoclimate
belemnites
palaeoceanography
clumped isotopes

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10.1016/j.epsl.2020.116401

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Vickers, M., Fernandez, A., Hesselbo, S. P., Price, G. D., Bernasconi, S. M., Lode, S., Ullmann, C. V., Thibault, N., Hougård, I. W., & Korte, C. (2020). Unravelling Middle to Late Jurassic palaeoceanographic and palaeoclimatic signals in the Hebrides Basin using belemnite clumped isotope thermometry. Earth and Planetary Science Letters, 546, 1-10. Article 116401. https://doi.org/10.1016/j.epsl.2020.116401

@article{c2c9c247ed654f90aebcf20ba619fe8e,

title = "Unravelling Middle to Late Jurassic palaeoceanographic and palaeoclimatic signals in the Hebrides Basin using belemnite clumped isotope thermometry",

abstract = "Clumped isotope based temperature estimates from exceptionally well-preserved belemnites from Staffin Bay (Isle of Skye, Scotland) reveal that seawater temperatures throughout the Middle-Late Jurassic were significantly warmer than previously reconstructed by conventional oxygen isotope thermometry. We demonstrate here that this underestimation by oxygen isotope thermometry was likely due to a) using the incorrect calcite thermometry equation for belemnite temperature reconstructions and b) by incorrectly estimating the seawater δ18O (δ18Osw) for the Hebrides Basin. Our data suggests that the fractionation factor for oxygen isotopes in belemnites from seawater was closer to that of slow-growing abiogenic calcites than that of other marine calcifying organisms. Our clumped isotope temperatures are used to reconstruct δ18Osw trends across the Callovian–Kimmeridgian in the Hebrides Basin. The δ18Osw varied significantly in the Hebrides Basin throughout this interval, possibly as a result of changing currents through the Laurasian seaway. Trends in temperature and δ18Osw are compared to published palaeoceanographic studies to shed light on changing palaeoceanography in the Tethyan and Boreal realms throughout the Middle–Late Jurassic.",

keywords = "Jurassic palaeoclimate, belemnites, palaeoceanography, clumped isotopes",

author = "Madeleine Vickers and Alvaro Fernandez and Hesselbo, \{Stephen P.\} and Price, \{Gregory D.\} and Bernasconi, \{Stefano M.\} and Stefanie Lode and Ullmann, \{Clemens Vinzenz\} and Nicolas Thibault and Houg{\aa}rd, \{Iben Winther\} and Christoph Korte",

year = "2020",

month = sep,

day = "15",

doi = "10.1016/j.epsl.2020.116401",

language = "English",

volume = "546",

pages = "1--10",

journal = "Earth and Planetary Science Letters",

issn = "0012-821X",

publisher = "Elsevier BV",

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Vickers, M, Fernandez, A, Hesselbo, SP, Price, GD, Bernasconi, SM, Lode, S, Ullmann, CV, Thibault, N, Hougård, IW & Korte, C 2020, 'Unravelling Middle to Late Jurassic palaeoceanographic and palaeoclimatic signals in the Hebrides Basin using belemnite clumped isotope thermometry', Earth and Planetary Science Letters, vol. 546, 116401, pp. 1-10. https://doi.org/10.1016/j.epsl.2020.116401

Unravelling Middle to Late Jurassic palaeoceanographic and palaeoclimatic signals in the Hebrides Basin using belemnite clumped isotope thermometry. / Vickers, Madeleine; Fernandez, Alvaro; Hesselbo, Stephen P. et al.
In: Earth and Planetary Science Letters, Vol. 546, 116401, 15.09.2020, p. 1-10.

Research output: Contribution to journal › Article › Academic › peer-review

TY - JOUR

T1 - Unravelling Middle to Late Jurassic palaeoceanographic and palaeoclimatic signals in the Hebrides Basin using belemnite clumped isotope thermometry

AU - Vickers, Madeleine

AU - Fernandez, Alvaro

AU - Hesselbo, Stephen P.

AU - Price, Gregory D.

AU - Bernasconi, Stefano M.

AU - Lode, Stefanie

AU - Ullmann, Clemens Vinzenz

AU - Thibault, Nicolas

AU - Hougård, Iben Winther

AU - Korte, Christoph

PY - 2020/9/15

Y1 - 2020/9/15

N2 - Clumped isotope based temperature estimates from exceptionally well-preserved belemnites from Staffin Bay (Isle of Skye, Scotland) reveal that seawater temperatures throughout the Middle-Late Jurassic were significantly warmer than previously reconstructed by conventional oxygen isotope thermometry. We demonstrate here that this underestimation by oxygen isotope thermometry was likely due to a) using the incorrect calcite thermometry equation for belemnite temperature reconstructions and b) by incorrectly estimating the seawater δ18O (δ18Osw) for the Hebrides Basin. Our data suggests that the fractionation factor for oxygen isotopes in belemnites from seawater was closer to that of slow-growing abiogenic calcites than that of other marine calcifying organisms. Our clumped isotope temperatures are used to reconstruct δ18Osw trends across the Callovian–Kimmeridgian in the Hebrides Basin. The δ18Osw varied significantly in the Hebrides Basin throughout this interval, possibly as a result of changing currents through the Laurasian seaway. Trends in temperature and δ18Osw are compared to published palaeoceanographic studies to shed light on changing palaeoceanography in the Tethyan and Boreal realms throughout the Middle–Late Jurassic.

AB - Clumped isotope based temperature estimates from exceptionally well-preserved belemnites from Staffin Bay (Isle of Skye, Scotland) reveal that seawater temperatures throughout the Middle-Late Jurassic were significantly warmer than previously reconstructed by conventional oxygen isotope thermometry. We demonstrate here that this underestimation by oxygen isotope thermometry was likely due to a) using the incorrect calcite thermometry equation for belemnite temperature reconstructions and b) by incorrectly estimating the seawater δ18O (δ18Osw) for the Hebrides Basin. Our data suggests that the fractionation factor for oxygen isotopes in belemnites from seawater was closer to that of slow-growing abiogenic calcites than that of other marine calcifying organisms. Our clumped isotope temperatures are used to reconstruct δ18Osw trends across the Callovian–Kimmeridgian in the Hebrides Basin. The δ18Osw varied significantly in the Hebrides Basin throughout this interval, possibly as a result of changing currents through the Laurasian seaway. Trends in temperature and δ18Osw are compared to published palaeoceanographic studies to shed light on changing palaeoceanography in the Tethyan and Boreal realms throughout the Middle–Late Jurassic.

KW - Jurassic palaeoclimate

KW - belemnites

KW - palaeoceanography

KW - clumped isotopes

U2 - 10.1016/j.epsl.2020.116401

DO - 10.1016/j.epsl.2020.116401

M3 - Article

SN - 0012-821X

VL - 546

SP - 1

EP - 10

JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

M1 - 116401

ER -

Unravelling Middle to Late Jurassic palaeoceanographic and palaeoclimatic signals in the Hebrides Basin using belemnite clumped isotope thermometry

Abstract

Keywords

UN SDGs

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