Clay minerals in methane seep sediments of the Laptev Sea (Arctic): diagenetic transformations and buffering functions

Clay minerals in methane seep sediments of the Laptev Sea (Arctic): diagenetic transformations and buffering functions

Bibliographic Details
Parent link:Applied Clay Science.— .— Amsterdam: Elsevier Science Publishing Company Inc.
Vol. 282.— 2026.— Article number 108092, 12 p.
Other Authors: Rudmin M. A. Maksim Andreevich, Ruban A. S. Aleksey Sergeevich, Deeva E. S. Elena Sergeevna, Khitrin I. S. Ivan Sergeevich
Summary:Title screen
This study first investigates diagenetic transformations and buffering functions of clay minerals in methane seep sediments from the Laptev Sea shelf (Arctic Ocean). Compared to background sediments, the seep-associated clays show enrichment in smectite content (up to 5.8 % vs. 0.8 %), attributed to reverse weathering, authigenic formation, and stabilization of smectite phases under reducing conditions. Illite group minerals in seep samples exhibit higher crystallinity and elevated Fe and Mg content in the octahedral sheets, likely reflecting the microbially mediated reduction of structural Fe3+. Chlorite is reduced by 2–6 wt% in seep sediments, reflecting partial dissolution and Fe2+ transfer into authigenic Fe-rich smectite. Submicron-sized pyrite crystals were detected on clay surfaces, indicating active sulfide diagenesis. TG-DCS-MS analyses revealed the unique buffering behavior of these clay minerals, as evidenced by their ability to sorb and release methane, water, CO2, and sulfur-bearing gases. The release of methane above 400 °C directly indicates its physicochemical association with the clay matrix. The sustained NO+ emission (m/z = 30) above 700 °C is proposed as a novel diagnostic signal of seep-related diagenetic alteration. This is the first detailed characterization of diagenetic clay transformations in Arctic methane seep environments. These findings demonstrate that clay minerals in Arctic seep environments act as mineralogical proxies of the mobility of hydrocarbon gases. Their compositional and structural modifications provide critical insights into methane cycling and diagenetic pathways in Arctic marine sediments. The results promise to refine reconstructions of fluid migration history and the geochemical evolution of sedimentary basins influenced by methane seepage
Текстовый файл
AM_Agreement
Published: 2026
Subjects:
Clay minerals
Methane seeps
Reverse weathering
Diagenesis
Buffer characteristics
Arctic
электронный ресурс
труды учёных ТПУ
Online Access:https://doi.org/10.1016/j.clay.2025.108092
Format: Electronic Book Chapter
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=684387

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