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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Silica Recrystallization in Petrified Wood
C. L. Stein (2)
ABSTRACT
The mineralogy of thirty-three samples of silicified wood was examined by X-ray diffraction, and each sample was found to consist of one of the following: opal-A opal-CT or quartz. The correlation between ordering of the silica phases and sample age suggests that the opal-A opal-CT quartz conversion sequence occurs in much the same manner and at approximately the same rates as in biogenic siliceous marine sediments. In addition, a poorly crystalline clay phase (illite?) was identified in most of these samples. Groundwater leaching of volcanogenic sediments, commonly thought to be the silica source, may also provide aluminum and other cations that are deposited simultaneously in wood tissue; consequently, silica recrystallization may be accompanied by authigenic clay formation.
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