跡津川断層に伴う断層内物質(その2) : 粒度別鉱物組成および化学組成

概要

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Mineralogical and geochemical studies carried out on intrafault materials collected at two out crops of the Atotsugawa fault of Central Japan, which had been described in detail in the previous paper. A sample of the intrafault materials was divided in to four fractions of 2μ>, 2-74μ, 74-250μ and 250μ< by their grain size. Meneralogy and geochemical compositions were examined in each fraction of the sample. The three fractions of 2μ< have almost similar mineralogy and geochemical compositions. Mineralogically, the 2μ> fraction is including more amount of montmorillonite, illite and chlorite and on the contrary less amount of quartz, feldspar and calcite than the other three fractions. The geochemical compositions of the 2μ> fraction is rich in Al_2O_3, MgO, K_2O and total H_2O and poor in SiO_2, CaO, Na_2O, and CO_2, comparing with those of the other three fractions. It is disclosed that the mineralogy, geochemical compositions and grain size of the intrafault materials have close relationship one another and should be related to the formation process of the materials and the degree of their weathering or alteration.
一般社団法人日本応用地質学会の論文
1982-12-30