Suitability of geological conditions in Suanjingzi area for the disposal of high-level radioactive wastes
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摘要: 在算井子地段开展地表地质特征、深部地质特征研究和三维地质建模等,初步查明了该地段花岗岩体的岩性和构造分布特征,得出如下认识:算井子地段主体岩性为花岗闪长岩,出露面积约176 km2,深度超过2 km,花岗岩体呈岩基状产出,总体呈NE—SW向分布,与研究区主构造线方向一致。花岗岩岩性单一,岩体深部完整性好,岩石蚀变程度低。研究区共有9条断裂,基本发育在岩体里面,倾角较陡。花岗岩岩体内可筛选出一面积大于31 km2岩块,岩性单一、容积足够大、完整性好,或可用作为未来高放废物处置库的候选场址。总体上,算井子地段作为高放废物地质处置预选地段,地质条件适宜性较好。Abstract: Based on investigations of geological characteristics of ground surface and deep parts and three-dimensional geological modeling, this study preliminarily ascertains the lithology of rock masses and the spatial distribution characteristics of faults in the Suanjingzi area, obtaining and the following understanding. In terms of lithology, the Suanjingzi area mainly consists of granodiorites with an exposed area of about 176 km2 and a depth of more than 2 km. The granites occur in the form of batholith and are generally distributed in the NE-SW trending, which is consistent with the direction of the main tectonic line in the study area. Meanwhile, they feature single lithology, high integrity of deep rock masses, and slight rock alteration. There are nine faults in the study area in total. They have roughly developed in rock masses and have steep dip angles. A rock mass with an area of greater than 31 km2 can be selected from the granites, which has single lithology, large enough volume, and high integrity and maybe used as a candidate site of the disposal repository of high-level radioactive wastes in the future. Overall, the Suanjingzi area has suitable geological conditions as a pre-selected site for the geological disposal of high-level radioactive wastes.
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