Whole-rock major and trace element geochemistry and geotectonic attribution of granitic rocks around the Higashigata, Akechi Town, Ena City, Gifu Prefecture, central Japan

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  • Yamasaki Toru
    AIST, Geological Survey of Japan, Research Institute of Geology and Geoinformation

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  • 岐阜県恵那市明智町東方及びその周辺地域に産する花崗岩類の全岩主成分・微量成分組成とその帰属
  • ギフケン エナシ アケチマチ トウホウ オヨビ ソノ シュウヘン チイキ ニ サンスル カコウガンルイ ノ ゼン ガン シュセイブン ・ ビリョウ セイブン ソセイ ト ソノ キゾク

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Abstract

<p>During the national mapping project for Quadrangle Series, 1:50,000, Akechi District, a granitic mass with 4 × 3.5 km in diameter at the Akechi Higashigata area, Ena City, Gifu Prefecture, central Japan was newly confirmed. The granitic mass is separated into Eastern and Western masses by overlying Akechi Conglomerate. Based on the results of whole-rock geochemical analyses, the Earstern Mass and Western Mass are correlate with the Busetsu Granite and Naegi-type biotite granite, respectively. The Busetsu Granite is characterized by relatively clear whole-rock geochemical trends and chondrite-normalized rare earth element patterns showing gentle slopes up to the left with negative Eu anomaly. On the other hand, the biotite granite shows rather scatterd whole-rock geochemistry and relatively flat rare earth element patterns with clear negative Eu anomaly. Most of the samples from the Busetsu Granite show higher alumina saturation index (>1.1) and fractionation of garnet from sediment-origin parental melt is suggested. On the contrary, the biotite granite show wide range of alumina saturation index due to heterogeneous assimilation of host pelitic metamorphic rocks. Although the parental magma of the Naegi-type granite (including biotite granite in the study area) has probably been similar to that of the metaluminous granites in the Ryoke Belt in the Chubu district, partial melting at shallower crustal condition has possibly resulted in SiO2-rich nature of the Naegi-type granite.</p>

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