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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">gtcrust</journal-id><journal-title-group><journal-title xml:lang="ru">Геодинамика и тектонофизика</journal-title><trans-title-group xml:lang="en"><trans-title>Geodynamics &amp; Tectonophysics</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2078-502X</issn><publisher><publisher-name>Institute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.5800/GT-2026-17-3-0895</article-id><article-id custom-type="edn" pub-id-type="custom">IDDARV</article-id><article-id custom-type="elpub" pub-id-type="custom">gtcrust-2296</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>СОВРЕМЕННАЯ ГЕОДИНАМИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>RECENT GEODYNAMICS</subject></subj-group></article-categories><title-group><article-title>КАТАСТРОФИЧЕСКИЙ КАРСТОВО-СУФФОЗИОННЫЙ ПРОВАЛ НА ХАДАХАН-МЕЛЬХИТУЙСКОМ КАРСТОВОМ МАССИВЕ, ЮЖНОЕ ПРИАНГАРЬЕ: ФАКТОРЫ, СРЕДА, МЕХАНИЗМ</article-title><trans-title-group xml:lang="en"><trans-title>CATASTROPHIC KARST-SUFFOSION SINKHOLE IN THE KHADAKHAN-MELKHITUI KARST MASSIF, SOUTHERN PRIANGARIE: FACTORS, ENVIRONMENT, MECHANISM</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3053-5511</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Мазаева</surname><given-names>О. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Mazaeva</surname><given-names>O. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>664033, Иркутск, ул. Лермонтова, 128 </p></bio><bio xml:lang="en"><p>128 Lermontov St, Irkutsk 664033 </p></bio><email xlink:type="simple">moks@crust.irk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6253-6140</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Акулова</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Akulova</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>664033, Иркутск, ул. Лермонтова, 128 </p></bio><bio xml:lang="en"><p>128 Lermontov St, Irkutsk 664033 </p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2452-4840</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Юрьев</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Yuriev</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>664033, Иркутск, ул. Лермонтова, 128 </p></bio><bio xml:lang="en"><p>128 Lermontov St, Irkutsk 664033 </p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0004-2628-1071</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Душкин</surname><given-names>Е. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Dushkin</surname><given-names>E. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>664033, Иркутск, ул. Лермонтова, 128 </p></bio><bio xml:lang="en"><p>128 Lermontov St, Irkutsk 664033 </p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт земной коры СО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>18</day><month>06</month><year>2026</year></pub-date><volume>17</volume><issue>3</issue><fpage>895</fpage><lpage>895</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Мазаева О.А., Акулова В.В., Юрьев А.А., Душкин Е.П., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Мазаева О.А., Акулова В.В., Юрьев А.А., Душкин Е.П.</copyright-holder><copyright-holder xml:lang="en">Mazaeva O.A., Akulova V.V., Yuriev A.A., Dushkin E.P.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.gt-crust.ru/jour/article/view/2296">https://www.gt-crust.ru/jour/article/view/2296</self-uri><abstract><p>В статье представлены результаты комплексного исследования катастрофического карстово-суффозионного провала, произошедшего 19 сентября 2024 г. на территории Хадахан-Мельхитуйского карстового массива (Южное Приангарье) и приведшего к гибели человека. На основе данных беспилотного летательного аппарата установлены морфометрические параметры провала (глубина 9.7 м, объем 412 м³), выполнено сравнение с историческими данными мониторинга с 1980-х гг. По результатам детальных лабораторных испытаний проб из стенок провала обнаружено, что покрывающая толща мощностью 9.7 м представлена структурно-неустойчивыми лессовидными суглинками и супесями с аномально высокими значениями пылеватости (до 84 %) и пористости (до 64 %). Установлено, что ключевую роль в провалообразовании играет взаимодействие карстовых и суффозионных процессов. Длительное (57 лет) влияние подпора Братского водохранилища и циклы колебания его уровня привели к выщелачиванию сульфатно-карбонатных пород, что стимулировало механический вынос пылеватых частиц из покрывающей толщи фильтрующейся водой. Выявлен двухстадийный механизм развития карстово-суффозионного провала: от формирования зоны разуплотнения над древней карстовой полостью до мгновенного (хрупкого) обрушения свода под воздействием техногенного триггера (веса тяжелой сельскохозяйственной техники). Изучение активизации карстово-суффозионных процессов в береговой зоне водохранилища вносит вклад в понимание современных геодинамических процессов и механизмов деформации земной поверхности, в том числе и под влиянием техногенеза.</p></abstract><trans-abstract xml:lang="en"><p>This paper presents the results of a comprehensive study of a catastrophic karst-suffosion sinkhole that occurred on September 19, 2024, in the Khadakhan-Melkhituy karst massif (Southern Angara region) and resulted in a human fatality. Using UAV‑derived data, the morphometric parameters of the sinkhole were determined (depth 9.7 m, volume 412 m³), and a comparison was made with historical monitoring data from the 1980s. Laboratory tests performed on samples collected from the sinkhole walls revealed that the 9.7‑m thick cover sequence consists of structurally unstable loess‑like loams and sandy loams, with anomalously high silt content (up to 84 %) and porosity (up to 64 %). The interaction between karst and suffosion processes plays a key role in the sinkhole formation. The long‑term (57‑year) backwater effect of the Bratsk Reservoir and its cyclic level fluctuations caused leaching of sulfate‑carbonate rocks, promoting mechanical removal of silt‑sized particles from the cover sequence by percolating water. A two-stage mechanism of karst-suffosion sinkhole development was identified: from the formation of a loosening zone above an ancient karst cavity to the instantaneous (brittle) roof collapse triggered by a technogenic factor – the weight of heavy agricultural machinery. The study of the reactivation of karst‑suffosion processes in the backwater zone of the Bratsk Reservoir contributes to the understanding of modern geodynamic processes and ground surface deformation mechanisms, including those induced by technogenesis.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>экзогеодинамика</kwd><kwd>тектоническая трещиноватость</kwd><kwd>катастрофический провал</kwd><kwd>покрытый сульфатно-карбонатный карст</kwd><kwd>зона подпора</kwd><kwd>Братское водохранилище</kwd><kwd>механизм взаимодействия процессов</kwd><kwd>лессовидные отложения</kwd><kwd>суффозия</kwd></kwd-group><kwd-group xml:lang="en"><kwd>exogeodynamics</kwd><kwd>tectonic fracturing</kwd><kwd>catastrophic sinkhole</kwd><kwd>covered sulphate-carbonate karst</kwd><kwd>backwater zone</kwd><kwd>Bratsk Reservoir</kwd><kwd>mechanism of process interactions</kwd><kwd>loess‑like deposits</kwd><kwd>suffusion</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование проведено при поддержке Минобрнауки РФ (проект № 1025022500090‑2‑1.5.1‑1.5.1, тема FWEF‑2026‑0009 «Палеогеография, динамика и эволюция природной среды Восточной Сибири в мезозое и кайнозое»). Работа выполнена с использованием оборудования и инфраструктуры ЦКП «Геодинамика и геохронология» ИЗК СО РАН (грант № 075‑15‑2021‑682).</funding-statement><funding-statement xml:lang="en">The study was supported by the Ministry of Science and Higher Education of the Russian Federation (project No. 1025022500090-2-1.5.1-1.5.1, research topic FWEF-2026-0009 "Paleogeography, Dynamics and Evolution of the Natural Environment of Eastern Siberia in the Mesozoic and Cenozoic"). The work was conducted using equipment and infrastructure of the Centre for Geodynamics and Geochronology at the Institute of the Earth’s Crust SB RAS (grant No. 075-15-2021-682).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Agisoft Metashape, 2022. Professional Edition, Version 1.8.5. User’s Manual. 118 p. 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