Application of X-ray microtomography techniques to detect early diagenetic changes in foraminifera shells

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Abstract

The structure of benthic foraminifera shells was studied by X-ray microtomography as a clarifying step in the study of secondary authigenic carbonate formation on foraminifera shells at methane vent sites. Without destroying the specimens, images of the outer surface and sections of benthic foraminifera shells were obtained, and the percentages of shell volumes, solid inclusions, and voids within the shells of the specimens were calculated. Shells of the species Nonionellina labradorica, sampled from sediment horizons corresponding to intense and prolonged methane events, compared to shells of the same species from horizons without methane events, show a 26.9% increase in the mean shell fraction, a nearly twofold increase in the mean solid inclusion fraction, and a 10.4% decrease in the mean shell void fraction. For shells of the species Uvigerina parvocostata, a similar comparison showed the following results: an increase in the mean value of the shell fraction by 6.5%, a 4-fold decrease in the mean value of the fraction of solid inclusions, and a 6.3% decrease in the mean value of the void fraction.

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About the authors

Leonid O. Utyupin

Far East Geological Institute, FEB RAS

Author for correspondence.
Email: leonid.9@mail.ru
ORCID iD: 0009-0006-3483-8815

Engineer

Russian Federation, Vladivostok

Maria A. Ushkova

Far East Geological Institute, FEB RAS

Email: m_ushkova@list.ru
ORCID iD: 0009-0001-3981-7099

Leading Engineer

Russian Federation, Vladivostok

Alexandra V. Romanova

Far East Geological Institute, FEB RAS

Email: sandra_ru@bk.ru
ORCID iD: 0000-0003-2884-1197

Candidate of Sciences in Geology and Mineralogy, Senior Researcher

Russian Federation, Vladivostok

Sergey P. Pletnev

V.I. Il’yichev Pacific Oceanological Institute, FEB RAS

Email: pletnev@poi.dvo.ru
ORCID iD: 0000-0001-9516-7089

Doctor of Sciences in Geology and Mineralogy, Leading Researcher

Russian Federation, Vladivostok

Anna V. Poselyuzhnaya

Far East Geological Institute, FEB RAS

Email: anna_ivv@mail.ru
ORCID iD: 0009-0004-0368-8856

Senior Engineer

Russian Federation, Vladivostok

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2. Fig. 1. Tests of benthic foraminifers U. parvocostata (left) and N. labradorica (right) collected from the 20–25 cm sediment horizon. All scale bars are 100 µm. From top to bottom: 1 – light microscope image, 2 – volume microtomographic image, 3 – microtomographic image in translucency mode, 4 – microtomographic cross-section of the shell

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3. Fig. 2. Tests of benthic foraminifers U. parvocostata (left) and N. labradorica (right) collected from the 470–475 cm sediment horizon. All scale bars are 100 µm. From top to bottom: 1 – image in a light microscope, 2 – volume microtomographic image, 3 – microtomographic image in translucency mode, 4 – microtomographic cross-section of a shell

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4. Fig. 3. Graph of distribution of values of the proportions of shell, voids and solid inclusions in shell samples: 1 – proportion of voids in a shell, %; 2 – proportion of solid inclusions in a shell, %; 3 – proportion of a shell, %

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