Some aspects of petrification of Miocene wood from Kaipara Harbour,New Zealand (鮫島輝彦先生追悼論文集)

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概要

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• 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.

• 静岡大学の論文

著者

• Sutherland J.

  Department Of Geology University Of Auckland

• Sutherland J.Isabel

  Department of Geology, University of Auckland

関連論文

• Some aspects of petrification of Miocene wood from Kaipara Harbour,New Zealand (鮫島輝彦先生追悼論文集)

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