【摘要】：小江斷裂帶北段為白鶴灘水電站庫區(qū)內(nèi)規(guī)模最大的斷裂構(gòu)造,其幾何展布特征與活動性對庫區(qū)移民及其就近安置規(guī)劃有明顯的制約作用。通過對小江斷裂北段大比例尺調(diào)查、斷裂帶石英形貌掃描以及現(xiàn)場氡氣測量等綜合研究,重新界定了小江斷裂帶北段展布,即北起寧南縣華彈鎮(zhèn),沿金沙江左岸經(jīng)永樂村,魯吉、溜姑延伸至蒙姑以南,斷裂帶總體向西陡傾。石英微形貌統(tǒng)計分析與應(yīng)力痕跡微形貌觀察結(jié)果表明,斷層強烈活動時間在晚更新世,同一石英顆粒表面具有代表兩種滑動方式(蠕滑和黏滑)的應(yīng)力痕跡組合,應(yīng)力痕跡的溶蝕程度、疊加和切割關(guān)系表明,斷層在晚更新世的滑動至少有3個亞期次,早期為蠕滑,中晚期為黏滑。小江斷裂北段的潛在地震危險性評估表明,其可能發(fā)生強震的最大震級約在MS6.8級~MS7.1級左右,為未來仍有可能再次活動的強震地區(qū)。
[Abstract]:The northern section of the Xiaojiang fault zone is the largest fault structure in the reservoir area of Baihetan Hydropower Station. The geometric distribution and activity of the fault zone have a significant effect on the resettlement planning of the reservoir area and its nearby settlement. Based on the investigation of large scale in the northern section of Xiaojiang fault, the comprehensive study of quartz morphology scanning and radon measurement in the fault zone, the distribution of the north section of the Xiaojiang fault zone is redefined, that is, the town of Huaming, Ningnan County, and the left bank of Jinsha River through Yongle Village. Luji, extending to the south of Menggu, the fault zone generally steeply to the west. The statistical analysis of quartz micromorphology and the observation of stress trace micromorphology show that the strong activity time of the fault occurred in the late Pleistocene, and the same quartz grain surface has two stress trace combinations representing two sliding modes (creep and slippage). The dissolution degree of stress trace, superposition and cutting relationship indicate that the slip of the fault in the late Pleistocene has at least three substages, which are creeping at the early stage and viscous slip in the middle and late stages. The potential earthquake risk assessment of the northern section of Xiaojiang fault shows that the maximum magnitude of the possible strong earthquake is about MS6.8 and MS7.1, which is a strong earthquake area where it is still possible to be active again in the future.
【作者單位】： 地質(zhì)災(zāi)害防治與地質(zhì)環(huán)境保護國家重點實驗室(成都理工大學(xué));
【基金】：國家自然科學(xué)基金(41521002,41072231) 中國地調(diào)局項目(1212011220154) 地質(zhì)災(zāi)害防治與地質(zhì)環(huán)境保護國家重點實驗室自主課題基金(SKLGP2015Z001)資助
【分類號】：P315.5

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