The lake floor morphology of the Southern Baikal rift basin as a result of holocene and Late Pleistocene seismogenic and gravitational processes
The lake floor morphology of the Southern Baikal rift basin as a result of holocene and Late Pleistocene seismogenic and gravitational processes
复制标题
全新世和晚更新世地震和重力过程导致的南贝加尔裂谷盆地的湖底形态
DOI：
10.1016/j.quaint.2019.01.038
复制
发表时间：
2019
影响因子：
2.2
通讯作者：
L. Naudts and H. Minami
中科院分区：
文献类型：
--
作者：
Kononov;E.E.;O.M. Khlystov;A.V. Kazakov;A.V. Khabuev;M. De Batist;L. Naudts and H. Minami
根据使用现代高精度条带测深仪获得的大量测深数据集，建立了南贝加尔湖盆地湖底数字地形模型。在这项工作中，我们提出了基于这个DTM的形态分析，我们能够确定构造活动直接或间接地参与了湖底形态的主要特征的形成，现代构造过程是由构造陡坎和古地震位错固定的，这些构造陡坎和古地震位错强烈地影响了凹陷的斜坡表面，在塞伦加古三角洲前缘的脆弱地层中有分离的块体盆地东南海岸的河流和滑坡。斜坡表面上的水下重力作用和峡谷的形成也与构造运动直接相关。Tankhoy油田的中新世-上新世沉积面大部分位于湖平面以下，目前正在经历海岸线附近的构造抬升。这些隆起引发了重大的水下侵蚀和水下重力过程，导致贝加尔湖最大支流和相关峡谷的现代三角洲前缘的形成。
Based on an extensive bathymetric data set obtained using modern high-precision swath bathymetry instruments, a Digital Terrain Model (DTM) of the lake floor of the Southern Baikal Basin has been created. In this work we present the morphological analysis based on this DTM.We were able to determine that tectonic activity was directly or indirectly involved in the formation of the main characteristics of the lake floor morphology.Modern tectonic processes are fixed by tectogenic scarps and paleoseismic dislocations that strongly affected the slope surfaces of the depression with detached blocks in the friable strata of the ancient delta front of the Selenga River and landslides on the southeastern shore of the basin. Underwater gravitational processes developed on the slope surfaces and the formation of canyons are also directly related to the tectonic movements.The Miocene-Pliocene sedimentary surface of the Tankhoy field, the bulk of which is below the lake level, currently experiences tectonic uplifts near the shoreline. These uplifts initiated significant underwater erosion, and underwater gravitational processes, which led to the formation of the modern delta fronts of the largest Lake Baikal tributaries and associated canyons.