澜沧江流域主要断裂断层泥中石英碎砾表面SEM特征及其断裂活动研究

Study on SEM Characteristics of Quartz Grains in the Fault Gouges of the Main Faults and the Fault Activity in the Lancang River Valley

根据断层泥及地层中石英碎砾表面SEM结构特征的研究 ,澜沧江断裂带早、中更新世是其主要活动时期 ,晚更新世活动减弱 ,全新世以来基本不活动 ;澜沧—勐遮断裂、孟连断裂晚更新世以来至全新世仍明显活动 ;木戛断裂、谦迈河断裂、平掌寨断裂及贵基处 -瓦窑断裂晚更新世后期以来基本不活动。因此澜沧—勐遮断裂。

The study on SEM characteristics of quartz grains in the fault gouges and strata shows that activity of the Lancang river fault mainly was in the upper and middle Pleistocene Epoch,reduced in the late Pleistocene and disappeared in the Holocene Epoch;the Lancang-Mengzhe and the Menglian faults still had obvious activity from the late Pleistocene to the Holocene Epochs and the Muga fault,the Qianmaihe fault,the Pingzhangzhai fault and the Guijichu-Wayao faults have not had basic activity since late Pleistocene,therefore,seismogeological disasters with high frequeney will occur in the Lancang-Mengzhe fault,the Menglian fault and relative areas in future.