Zeolites-permineralized fossil-woods from Soutěsky near Děčín lahar

Mysliveček, Jakub; Koutecký, Vít; Rapprich, Vladislav; Sakala, Jakub; Pour, Ondřej; Laufek, František

doi:10.3140/zpravy.geol.2021.09

Cited by 3 publications

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“…On the other hand, although it is far rare compared to those cases, zeolite formation in fossilized gastropod and pelecypod shells (Staple, 1965) and plant tissues (Modreski et al, 1982;Mysliveček et al, 2021) has also been reported. The zeolite-infilled shells reported by Staple (1965) were found in Oligocene sandstone in Oregon, USA and composed mainly of analcime, heulandite and stilbite.…”

Section: Introductionmentioning

confidence: 99%

Mineralogical study on zeolites in gastropod fossils in Miocene sediments in Minamisoma, Fukushima, Japan

ISHIHARA,

OHFUJI

2023

Journal of Mineralogical and Petrological Sciences

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In this study, we investigated the origin and formation process of zeolitized gastropod fossils in Neogene sediments (Shiote Formation) in Minamisoma, Fukushima, Japan using powder X-ray diffraction, SEM-EDS and micro-Raman spectroscopic analysis. The formation of zeolites was particularly pronounced in the upper chamber, which was not filled with detrital particles, of the gastropod fossils, where tabular crystals of heulandite were observed growing directly from the shell wall. The heulandite crystals are often covered by large euhedral crystals of calcite and occasionally by acicular crystals of mordenite. The formation of zeolite (heulandite) was also observed in the matrix of the host sandstone together with clay minerals (mostly montmorillonite), suggesting that the Shiote Formation experienced moderate metamorphism equivalent to zeolite facies during burial diagenesis. The Si/Al ratio of heulandite was found to decrease gradually from the bottom (~4.5) to the top (~3.1) within single crystals across the threshold (4.0) for clinoptilolite/heulandite classification boundary. This may reflect the increase in temperature of the surrounding environment with increase in the burial depth. The extensive growth of zeolites and calcite inside the gastropod fossils indicates that the shell provided semi-closed spaces in which pore fluid could be retained and A c c e p t e d i n J M P S P r e -p r o o f

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Section: Introductionmentioning

confidence: 99%