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.

地震造成的六谷山滑坡很多。边坡失稳主要集中在磁铁矿系列花岗岩和沸石脉分布区。磁铁矿系列花岗岩的强烈破碎和风化是导致边坡失稳集中的主要原因。沸石在滑坡陡崖上呈脉状产出。沸石是沿沿着断层热液蚀变形成的。我们研究了在兵库县南部地震引起的边坡破坏中岩石化学成分与风化程度之间的关系。在风化过程中，Ca、Mg、Fe和Na等元素从岩石中被去除。常见的黑云母和斜长石对化学风化作用相对敏感。黑云母很容易风化，遇水即变成蛭石和高岭石。风化岩中MgO、CaO、FeO含量显著偏低。因此，风化岩石的化学成分与边坡破坏的风化程度有着重要的关系。边坡失稳过程中岩矿化学成分的变化反映了边坡的风化程度，对边坡失稳的防治有一定的参考价值。

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）。