Mixed-layer chlorite-corrensite minerals in hydrothermally altered upper pleistocene sediments, Hole ODP 1036A, Juan de Fuca Ridge, Pacific Ocean
- Авторлар: Sakharov B.А.1, Kurnosov V.B.1, Korshunov D.M.1, Morozov I.А.2
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Мекемелер:
- Geological Institute, Russian Academy of Sciences
- Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences
- Шығарылым: № 2 (2025)
- Беттер: 155-175
- Бөлім: Articles
- URL: https://journals.rcsi.science/0024-497X/article/view/289047
- DOI: https://doi.org/10.31857/S0024497X25020028
- EDN: https://elibrary.ru/CHUFAP
- ID: 289047
Дәйексөз келтіру
Аннотация
The article provides detailed structural and crystal-chemical characteristics of mixed-layer chlorite-corrensite minerals, found in fractions <1 μm, isolated from samples of Upper Pleistocene sediments from Hole ODP 1036A, which was drilled at the “Dead Dog” hydrothermal field in the northern part of the Middle Valley of the Juan de Fuca Ridge in northeastern Pacific Ocean. Using the modeling method of X-ray diffraction patterns, it was shown for the first time that the studied mixed-layer minerals should be considered as chlorite-corrensites rather than chlorite-smectites. In the structure of the studied mixed-layer minerals, trioctahedral chlorite and corrensite layers occur in a ratio of 50:50 – 60:40 and ~90:10, which alternate with a tendency to segregation at a short-range order factor R = 1. Averaged crystal- chemical formulas were obtained for mixed-layer chlorite-corrensites and for their individual chlorite and corrensite layers. It is assumed that in corrensite packages of natural chlorite-corrensite a model with an asymmetric distribution of charges in tetrahedral sheets of their 2:1 layers is realized. All samples belong to Mg-Fe varieties of chlorite-corrensites. The most probable mechanism for the formation of chlorite-corrensites of different compositions is the dissolution of the original terrigenous clay minerals during the interaction of hydrothermal fluid with terrigenous sediments and the synthesis of these mixed-layer minerals from solution.
Толық мәтін

Авторлар туралы
B. Sakharov
Geological Institute, Russian Academy of Sciences
Хат алмасуға жауапты Автор.
Email: sakharovba@gmail.com
Ресей, 119017, Moscow, Pyzhevsky lane, 7, bld. 1
V. Kurnosov
Geological Institute, Russian Academy of Sciences
Email: vic-kurnosov@rambler.ru
Ресей, 119017, Moscow, Pyzhevsky lane, 7, bld. 1
D. Korshunov
Geological Institute, Russian Academy of Sciences
Email: dmit0korsh@gmail.com
Ресей, 119017, Moscow, Pyzhevsky lane, 7, bld. 1
I. Morozov
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences
Email: ivan.morozov@yandex.ru
Ресей, 119017, Moscow, Staromonetny lane, 35
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