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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Vestnik of the Far East Branch of the Russian Academy of Sciences</journal-id><journal-title-group><journal-title xml:lang="en">Vestnik of the Far East Branch of the Russian Academy of Sciences</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник Дальневосточного отделения Российской академии наук</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0869-7698</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">685983</article-id><article-id pub-id-type="doi">10.31857/S0869769824050095</article-id><article-id pub-id-type="edn">HPEBBI</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Earth and Environment Sciences</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Науки о Земле и окружающей среде</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Application of X-ray microtomography techniques to detect early diagenetic changes in foraminifera shells</article-title><trans-title-group xml:lang="ru"><trans-title>Применение методов рентгеновской микротомографии для выявления ранних диагенетических изменений раковин фораминифер</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0006-3483-8815</contrib-id><name-alternatives><name xml:lang="en"><surname>Utyupin</surname><given-names>Leonid O.</given-names></name><name xml:lang="ru"><surname>Утюпин</surname><given-names>Леонид Олегович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Engineer</p></bio><bio xml:lang="ru"><p>инженер</p></bio><email>leonid.9@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0001-3981-7099</contrib-id><name-alternatives><name xml:lang="en"><surname>Ushkova</surname><given-names>Maria A.</given-names></name><name xml:lang="ru"><surname>Ушкова</surname><given-names>Мария Александровна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Leading Engineer</p></bio><bio xml:lang="ru"><p>ведущий инженер</p></bio><email>m_ushkova@list.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2884-1197</contrib-id><name-alternatives><name xml:lang="en"><surname>Romanova</surname><given-names>Alexandra V.</given-names></name><name xml:lang="ru"><surname>Романова</surname><given-names>Александра Владимировна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Candidate of Sciences in Geology and Mineralogy, Senior Researcher</p></bio><bio xml:lang="ru"><p>кандидат геолого-минералогических наук, старший научный сотрудник</p></bio><email>sandra_ru@bk.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9516-7089</contrib-id><name-alternatives><name xml:lang="en"><surname>Pletnev</surname><given-names>Sergey P.</given-names></name><name xml:lang="ru"><surname>Плетнев</surname><given-names>Сергей Павлович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Doctor of Sciences in Geology and Mineralogy, Leading Researcher</p></bio><bio xml:lang="ru"><p>доктор геолого-минералогических наук, ведущий научный сотрудник</p></bio><email>pletnev@poi.dvo.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0004-0368-8856</contrib-id><name-alternatives><name xml:lang="en"><surname>Poselyuzhnaya</surname><given-names>Anna V.</given-names></name><name xml:lang="ru"><surname>Поселюжная</surname><given-names>Анна Владимировна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Senior Engineer</p></bio><bio xml:lang="ru"><p>старший инженер</p></bio><email>anna_ivv@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Far East Geological Institute, FEB RAS</institution></aff><aff><institution xml:lang="ru">Дальневосточный геологический институт ДВО РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">V.I. Il’yichev Pacific Oceanological Institute, FEB RAS</institution></aff><aff><institution xml:lang="ru">Тихоокеанский океанологический институт им. В.И. Ильичева ДВО РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-10-30" publication-format="electronic"><day>30</day><month>10</month><year>2024</year></pub-date><issue>5</issue><issue-title xml:lang="ru"/><fpage>136</fpage><lpage>147</lpage><history><date date-type="received" iso-8601-date="2025-06-26"><day>26</day><month>06</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Российская академия наук</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0869-7698/article/view/685983">https://journals.eco-vector.com/0869-7698/article/view/685983</self-uri><abstract xml:lang="en"><p>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 <italic>Nonionellina labradorica</italic>, 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 <italic>Uvigerina parvocostata</italic>, 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.</p></abstract><trans-abstract xml:lang="ru"><p>Методом рентгеновской микротомографии были изучены особенности строения раковин бентосных фораминифер в качестве уточняющего этапа исследования образования вторичного аутигенного карбоната на раковинах фораминифер в местах выхода метана. Не разрушая образцы, были получены изображения внешней поверхности и срезов раковин бентосных фораминифер, а также подсчитаны процентные соотношения объемов раковин, твердых включений и пустоты внутри раковины образцов. Раковины вида <italic>Nonionellina labradorica,</italic> отобранные из горизонтов осадков, соответствующих интенсивным и продолжительным метановым событиям,<italic> </italic>при сравнении с раковинами того же вида из горизонтов без метановых событий демонстрируют увеличение среднего значения доли раковины на 26,9%, увеличение среднего значения доли твердых включений почти в 2 раза и уменьшение среднего значения доли пустоты внутри раковины на 10,4%. Для раковин вида <italic>Uvigerina parvocostata </italic>аналогичное сравнение показало следующие результаты: увеличение среднего значения доли раковины на 6,5%, уменьшение среднего значения доли твердых включений в 4 раза, а среднего значения доли пустоты – на 6,3%.</p></trans-abstract><kwd-group xml:lang="en"><kwd>foraminifera</kwd><kwd>Sea of Okhotsk</kwd><kwd>X-ray microtomography</kwd><kwd>authigenic carbonate</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>фораминиферы</kwd><kwd>Охотское море</kwd><kwd>рентгеновская микротомография</kwd><kwd>аутигенный карбонат</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Министерство науки и высшего образования Российской Федерации</institution></institution-wrap><institution-wrap><institution xml:lang="en">Ministry of science and higher education of the Russian Federation</institution></institution-wrap></funding-source><award-id>075-01169-22-00</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Zonenshain L. 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