Prevention of disasters due to the chemical compositions from the magnetite-series granite and zeolite vein in the slope failure area

边坡失稳区磁铁矿系花岗岩和沸石脉化学成分的防灾

• 批准号: 10554023
• 负责人: TAINOSHO Yoshiaki
• 金额: $ 8.51万
• 依托单位: KOBE UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10554023/
• 关键词: Hyogoken-Nanbu Earthquake; magnetite-series granite; slope failures; zeolite vein; chemical composition; weathering; 兵庫県南部地震; 風化作用; 元素逸脱; 崩壊の予知; 多発地域

Rokko Mountains had many slope failures caused by the Earthquake. The slope failures appear to concentrated in the magnetite-series granite and zeolite vein distribution area. The reason for the slope failure concentration is thought to be heavy crushed and weathering in the magnetite-series granite. Zeolite occur as vein on landslide scarp. Zeolite was formed by hydrothermal alteration along fault. We have been studied the relation between chemical composition of the rocks and grade of weathering in the slope failure caused by the Hyogoken-Nanbu Earthquake. The elements such as Ca, Mg, Fe and Na are removed from the rocks during the weathering process. The common biotite and plagioclase are relatively susceptible to chemical weathering. Biotite is easily weathered and alters in the presence of water to vermiculite and kaolinite. MgO, CaO and FeO contents are remarkable low in the weathered rock. Thus, there is an important relationship between chemical composition of the weathered rocks and grade of weathering in the slope failure. The rock and mineral chemistry in the slope failure reflect to weathering grade and useful for judgment of prevention of the slope failure.

六甲山在地震中出现了许多滑坡。边坡破坏主要集中在磁铁矿系花岗岩和沸石脉分布区。认为边坡破坏集中的原因是磁铁矿系花岗岩的严重破碎和风化作用。沸石呈脉状分布在滑坡陡坡上。沸石是沿断层热液蚀变形成的。本文研究了小古肯-南部地震引起的边坡破坏中岩石化学成分与风化程度的关系。Ca、Mg、Fe、Na等元素在风化过程中被从岩石中去除。普通黑云母和斜长石相对容易受化学风化作用。黑云母易风化，遇水易蚀变为蛭石和高岭石。风化岩中MgO、CaO和FeO含量明显偏低。因此，在边坡破坏中，风化岩石的化学成分与风化程度有重要的关系。边坡破坏中的岩石矿物化学性质反映了边坡的风化等级，对边坡破坏的预防判断具有重要意义。

项目成果

足立光司: "神戸市東部における表層土壌の重金属汚染"神戸大学発達科学部研究紀要. 7. 89-102 (2000)

安达浩二：“神户市东部表层土壤的重金属污染”，神户大学发展科学学院通报，7. 89-102 (2000)。

田結庄 良昭: "兵庫県南部地震による斜面崩壊地の花崗岩と鉱物の化学組成"Proceedings of the 10th Symposium on Geo-Environments and Geo-Technics. 10. 127-132 (2000)

田由所义明：《兵库县南部地震引起的边坡破坏区花岗岩和矿物的化学成分》第十届地质环境与地质技术研讨会论文集 10. 127-132 (2000)。

TAINOSHO,Y.and TAKAHASHI,M.: "A study of prevention of disasters due to collapse of steep slopes after the 1995 Hyogoken-Nanbu Earthquake in Takarazuka city area -A catalog of steep slopes-."Bulletin of Research center of Urban Safety, Kobe University. vo

TAINOSHO,Y.和TAKAHASHI,M.：“1995年兵库县南部地震后宝冢市地区陡坡崩塌灾害预防研究-陡坡目录-”。城市安全研究中心通报

田結庄良昭: "神戸市東部、鶴甲付近の斜面崩壊地域の花崗岩の性質"Proceedings of the 8th Symposium on Geo-Environments and Geo-technics. 7. 269-274 (1997)

Yoshiaki Tamusho：“神户市东部鹤口附近斜坡破坏区的花岗岩特征”第八届地质环境和地质技术研讨会论文集。7. 269-274（1997）。

田結庄良昭: "神戸市西部、長田付近の地下水深度と地震被害の関係"応用地質. 38. 145-152 (1997)

Yoshiaki Tayusho：“神户市西部和永田附近地下水深度与地震损害的关系”应用地质学38。145-152（1997）。