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タイトル: Some aspects of petrification of Miocene wood from Kaipara Harbour, New Zealand(MEMORIAL VOLUME TO THE LATE PROFESSOR TERUHIKO SAMESHIMA)
著者: Sutherland, J. Isabel
掲載誌名: Geoscience reports of Shizuoka University
出版者: Shizuoka University. Institute of Geosciences
巻: 20
開始ページ: 143
終了ページ: 151
出版日付: 1994-03
NDC: 457
抄録: Silicified woods of probable Altonian (Lower Miocene) age occur in southeast Hukatere Peninsula, Kaipara Harbour, New Zealand. Pyroclastic flows, apparently flow-ing from a northerly direction, carried woods from a broadleaf-podocarp forest to mix with probable Avicennia ( mangrove) growing in estuarine conditions close to the site of preservation. Many woods were partially or completely carbonized by the flow. Thin section petrography, scanning electron microscope micrographs, and X-ray diffractograms indicate the woods were silicified by silica in solution, formed by devitrification of volcanic glass. The sequence of silicification is likely to have been either opal-A → opal-CT → a -quartz and chalcedony, or directly to a -quartz and chalcedony. The degree of crystallinity of the quartz is not time dependent. The mode of occurrence of a -quartz, chalcedony, cristobalite, tridymite, Iussatite and amorphous opal is described. Other minerals present in the woods include goethite and members of the saponite group, as well as organic compounds.
ISSN: 03886298 OPAC
NII論文ID: 110000413353 ciniia
NII書誌ID: AN00103190 OPAC ciniib
バージョン: publisher
出現コレクション:1993 20

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