【摘要】 本文综合DEM数据、地形地貌剖面、钻孔及地层划分、浅层地震勘探、野外地质调查和典型地质剖面等资料,对依兰-伊通断裂依兰段的新构造活动进行了研究。结果表明,依兰-伊通断裂西支F1-1对小兴安岭东缘控制明显,地表陡坎微地貌相对比较发育,最新活动时代为晚更新世中晚期;东支F1-2控制了张广才岭的西缘,卫星影像线性异常不明显,地表陡坎微地貌不发育,浅层地震反射剖面所揭示的上断点埋深为45—50m,其最新活动时代为早更新世早期;中支断裂F1-3控制了低一级的地貌面,卫星影像比较清楚,地表发育高约1—2m左右的陡坎微地貌,最新活动时代为全新世。该断裂最新的活动性质表现为以右旋走滑运动为主,同时伴随有比较明显的逆冲运动分量。同时,综合前人研究结果和本次研究结果,可将依兰-伊通断裂依兰段新生代以来的构造演化划分为五个不同的阶段,即:古新世初期—古新世末期的左旋走滑挤压阶段、古新世末期—始新世中期的右旋走滑伸展阶段、始新世末期—上新世末期的右旋走滑挤压阶段、上新世末期—早第四纪的右旋走滑伸展阶段、晚第四纪的右旋走滑逆冲阶段。这一演化过程在东北地区可能具有较好的代表性。更多还原

【Abstract】 Based on the synthesized research on high precision DEM(Digital Elevation Models), large scale topography profile, shallow artificial seismic reflection, well drilling, field geological investigation and typical geological profile, we found that the west branch of Yilan-Yitong fault F1-1 controlled the east edge of Xiaoxing’an Mountains, the surface scarp microtopography was developed relatively clearly, its latest activities occurred in Middle-late stage of late Pleistocene. The west branch of Yilan-Yitong fault F1-2 that has great impact on the growth of Zhangguangcai Mountains, however, shows neither clear satellite image anomalies nor surface scarp microtopography. Furthermore, the shallow artificial seismic reflection detection revealed that the shallowest depth of breakpoint is from 45 to 50 meters depth below the surface, which proved that its latest activities occurred in early Pleistocene. Additionally, the middle branch of Yilan-Yitong fault F1-3 which controlled the development of lower geomorphic surface has very clear satellite image anomalies, and 1—2m high surface scarp microtopography could be seen in the surface, which proved that the latest activities time of the fault is Holocene. We also found that the latest activity properties of Yilan segment of the Yilan-Yitong faultis dominated by dextral strike-slip movement accompanied by obvious thrust motion component. Combining previous studies with our current results, we divided the Cenozoic tectonic evolution of Yilan segment of the Yilan-Yitong fault into five stages: left-lateral and uplift period(Early Paleocene –late Paleocene), right lateral and extension period(late Paleocene-middle Eocene), right lateral and uplift period(late Eocen — late Pliocene), right lateral and tension period(late Pliocene — early Quaternary), and right lateral and uplift period(since late Quaternary). Such tectonic evolution feature is much representative in northeast region of China.更多还原