Clay-Organic Complexes as a Cementing Agent in the Arahama Sand Dune, Japan

Kazue Tazaki
1989 Clays and clay minerals  
Cementing materials in the Arahama sand dune, Japan, were studied mineralogicaUy and biogeochemically to gain a better understanding of the cause of hardening. The cementing material is a clayorganic complex composed of noncrystalline gels and a matrix of small, poorly crystalline particles showing 14-16-~ spacings. The gel materials appear to have transformed into the poorly crystalline particles, which have a high carbon content and A1/Si ratios of 2.2 to 2.0. These particles are slightly
more » ... es are slightly richer in Si and poorer in Fe than the gel materials themselves. The organic portion of the complex can be removed by H202 treatment, leaving a noncrystalline network-structure containing a dispersed granular component. Scanning auger-depth profiles of individual particles show a high surface concentration of C and O and an increase in the AI/Si ratio with depth. The energy-intensity distribution suggests a mixture of carbon compounds having a major core-line binding energy of a hydrocarbon. The gel-cementing materials in the sand dune may have been formed from biochemical weathering products of organic matter, which subsequently controlled the formation of clay-organic complexes. ~g. ~6#)~~I~<. AI/SiE~I2.2--2.0T'~. r162 ". Si~$
doi:10.1346/ccmn.1989.0370304 fatcat:bd3gbtsgjbc6pd6xdb54lmw7hu