Three-dimensional Imaging of Miarolitic Cavities in the Kakkonda Granite Using X-ray CT
Three-dimensional Imaging of Miarolitic Cavities in the Kakkonda Granite Using X-ray CT
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使用 X 射线 CT 对 Kakkonda 花岗岩中的细粒岩空洞进行三维成像
DOI：
10.11367/grsj1979.19.209
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
H. Muraoka
中科院分区：
文献类型：
--
作者：
T. Ohtani;Y. Nakashima;H. Muraoka
利用医用X射线CT扫描仪对位于日本东北部Kakkonda地热田的WD-1a井的定向花岗岩岩芯进行了三维成像。本文证实了X射线CT具有(1)无损观测、(2)快速三维成像、(3)操作简便等优点，是岩心观测的有力工具。CT图像显示花岗岩核内的混晶石腔、长英质矿物、镁铁质矿物和包体。根据CT图像可以建立细晶石化空洞的三维分布，并显示出空间上的不均匀发展，边界为走向20的边界，向北西向倾斜55。由于这一趋势与微震震源分布、等温线分布和电阻率梯度分布相吻合，因此这些空洞可能与Kakkonda地热储的发育有关。
Three-dimensional imaging of oriented granite cores from the borehole WD-1a, located at the Kakkonda geothermal field (Northeast Japan), was performed by a medical X-ray CT scanner. This paper confirms that X-ray CT is powerful tool for core observation because of (1) non-destructive observation,(2) rapid three-dimensional imaging and (3) easy operation. CT images display miarolitic cavities, felsic minerals, mafic minerals and en-claves inside granite cores. Three-dimensional distribution of miarolitic cavities can be constructed from CT im-ages and shows spatially heterogeneous development with the boundary which strikes 20, and dips 55 to the NW. Because this trend is coincident with that of hypocenter distribution of microearthquakes, distribution of isothermal contour and resistivity gradient, these cavities may be related to the development of the Kakkonda geothermal reservoir.