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Abstract ▼ AI-Helper

The Hamori Formation, Jeju Island, consists of volcanigenic sediments reworked from the Holocene Songaksan tuff ring, which were lithified in a short period of time after deposition. The lithification of Hamori sediment was investigated by X-ray diffraction, scanning/transmission electron microscopy...

The Hamori Formation, Jeju Island, consists of volcanigenic sediments reworked from the Holocene Songaksan tuff ring, which were lithified in a short period of time after deposition. The lithification of Hamori sediment was investigated by X-ray diffraction, scanning/transmission electron microscopy, and electron microprobe analysis. Ash grains are composed of glass matrix, plagioclase, olivine, and pyroxene. The glass matrix was selectively reacted with pore water, forming alteration rinds along the grain periphery simultaneously with the precipitation of pore-lining smectite. Porous leached glass was formed just around glass core by the mass leaching of cations. Leached cations were partly precipitated as fine aggregates of amorphous materials and smectite to form alteration rind, and partly as thin layers of pore-lining smectite. Smectite linings bridge detrital grains lithifying the Hamori Formation. The smectite cementation by the fast alteration of basaltic glass played a major role in the good preservation of tuffaceous sedimentary sequences and volcanoes located in the high energy coastal environment of Jeju Island.

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