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- W785284942 abstract "Mineralogical and chemical examinations were performed on interstratified illite-smectite (I-S) minerals that occur in the mudstones from a petroleum exploration well in the Tertiary marine basin, Japan. X-ray diffraction analysis shows that component layers of illite in the interstratified I-S increase with increasing burial depth while those of smectie decrease. In addition, the randomly (R=0) interstratified illite-smectite is changed into Rp1 ordered I-S at a depth of about 4,000 m, which corresponds to the result of organic analysis and indicates a burial temperature of about . However, the present geothermal gradient shows that the conversion of the random I-S to R=0 ordered I-S is likely to occur at 3,000 m. This discrepancy may be interpreted by the reverse fault at 2,500 m which resulted in a deeper burial of sediments up to 1,000 m. Chemical analysis also shows the compositional variation in I-S with increasing depth: a decrease in Si and an increases in Al and K, indicating that the substitution of Al for Si in tetrahedral sheets is compensated by the addition of K to interlayers. K may be derived from K-feldspar and micas, which is present in the mudstones." @default.
- W785284942 created "2016-06-24" @default.
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- W785284942 date "2006-01-01" @default.
- W785284942 modified "2023-09-24" @default.
- W785284942 title "Burial Diagenesis of Smectite in the Tertiary Marine Basin, Japan" @default.
- W785284942 hasPublicationYear "2006" @default.
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