Petrography and geochemical analysis of Arctic ikaite pseudomorphs from Utqiaġvik (Barrow), Alaska
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Petrography and geochemical analysis of Arctic ikaite pseudomorphs from Utqiaġvik (Barrow), Alaska. / Schultz, Bo P.; Huggett, Jennifer M.; Kennedy, George L.; Burger, Paul; Friis, Henrik; Jensen, Anne M.; Kanstrup, Marie; Bernasconi, Stefano M.; Thibault, Nicolas; Ullmann, Clemens V.; Vickers, Madeleine L.
I: Norwegian Journal of Geology, Bind 103, Nr. 1, 202303, 2023.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Petrography and geochemical analysis of Arctic ikaite pseudomorphs from Utqiaġvik (Barrow), Alaska
AU - Schultz, Bo P.
AU - Huggett, Jennifer M.
AU - Kennedy, George L.
AU - Burger, Paul
AU - Friis, Henrik
AU - Jensen, Anne M.
AU - Kanstrup, Marie
AU - Bernasconi, Stefano M.
AU - Thibault, Nicolas
AU - Ullmann, Clemens V.
AU - Vickers, Madeleine L.
N1 - Funding Information: Marincovich for the opportunity to collaborate in their Alaskan field studies in and 堀 Funding was provided for this study by the European Commission, Horizon 2020 (ICECAP; grant no. 缀 to M 堀㸃堀 Vickers 唀 and from the Research Council of Norway through the Centres of Excellence funding scheme 唀 project number 堀 The Research Council of Norway is acknowledged for support to the Goldschmidt ?aboratory national infrastructure 縁褁谁紁椁ḁခ騀 number 缃唀 and we thank Siri Simonsen for use and running of the SEM at the University of Oslo. Lastly, we thank the two anonymous reviewers for their constructive comments that have helped to improve the final manuscript 堀 Thanks to Iñupiat Heritage Center and Army Corps of Engineers for informations 唀 and to all Iñupiat inhabitants who has helped improving this paper. Profound thanks to Norwegian Journal of Geology and coauthors, specially project holder Madeleine Vickers for making this a much better paper ? Funding Information: G. L. Kennedy thanks USGS colleagues D. M. Hopkins and L. N. Marincovich for the opportunity to collaborate in their Alaskan field studies in 1981 and 1983. Funding was provided for this study by the European Commission, Horizon 2020 (ICECAP; grant no. 101024218) to M.L. Vickers, and from the Research Council of Norway through the Centres of Excellence funding scheme, project number 223272. The Research Council of Norway is acknowledged for support to the Goldschmidt Laboratory national infrastructure (project number 295894), and we thank Siri Simonsen for use and running of the SEM at the University of Oslo. Lastly, we thank the two anonymous reviewers for their constructive comments that have helped to improve the final manuscript. Thanks to Iñupiat Heritage Center and Army Corps of Engineers for informations, and to all Iñupiat inhabitants who has helped improving this paper. Profound thanks to Norwegian Journal of Geology and coauthors, specially project holder Madeleine Vickers for making this a much better paper. Publisher Copyright: © the authors.
PY - 2023
Y1 - 2023
N2 - y Ikaite and pseudomorphs thereafter (“glendonites”) are a potentially powerful tool for palaeoclimatic studies, as a low-temperature proxy. However, much uncertainty still surrounds the drivers of ikaite formation, in particular prerequisite thermal and chemical conditions. Furthermore, the ikaite to glendonite transformation is not fully understood, and it was unclear which calcite phases in glendonites were ikaite-derived and which were later diagenetic calcites. This leads to difficulties in choosing which phase to analyse in order to reconstruct the original ikaite growth environmental conditions. Petrographic examination of air-transformed ikaite from the Isatkoak Lagoon in Utqiaġvik, Alaska, confirms that both ’Type I’ and ’Type II’ calcite phases seen in glendonites are directly derived from ikaite breakdown and not from secondary sources. Clumped isotope temperature reconstructions for transformed ikaites from Utqiaġvik, and comparison to Recent glendonites from the White Sea, Russia, confirm that clumped isotope thermometry may be used to reconstruct ikaite growth temperatures, whilst stable isotopes and minor elemental analysis reveal that a range of geochemical conditions characterise ikaite growth sites.
AB - y Ikaite and pseudomorphs thereafter (“glendonites”) are a potentially powerful tool for palaeoclimatic studies, as a low-temperature proxy. However, much uncertainty still surrounds the drivers of ikaite formation, in particular prerequisite thermal and chemical conditions. Furthermore, the ikaite to glendonite transformation is not fully understood, and it was unclear which calcite phases in glendonites were ikaite-derived and which were later diagenetic calcites. This leads to difficulties in choosing which phase to analyse in order to reconstruct the original ikaite growth environmental conditions. Petrographic examination of air-transformed ikaite from the Isatkoak Lagoon in Utqiaġvik, Alaska, confirms that both ’Type I’ and ’Type II’ calcite phases seen in glendonites are directly derived from ikaite breakdown and not from secondary sources. Clumped isotope temperature reconstructions for transformed ikaites from Utqiaġvik, and comparison to Recent glendonites from the White Sea, Russia, confirm that clumped isotope thermometry may be used to reconstruct ikaite growth temperatures, whilst stable isotopes and minor elemental analysis reveal that a range of geochemical conditions characterise ikaite growth sites.
KW - Coastal
KW - Glendonite
KW - Holocene
KW - Ikaite
KW - Isotopes
KW - Petrology
U2 - 10.17850/njg103-1-3
DO - 10.17850/njg103-1-3
M3 - Journal article
AN - SCOPUS:85149260805
VL - 103
JO - Norwegian Journal of Geology
JF - Norwegian Journal of Geology
SN - 2387-5852
IS - 1
M1 - 202303
ER -
ID: 347306223