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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Tracking sediment provenance and erosional evolution of the western Greater Caucasus
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Tracking sediment provenance and erosional evolution of the western Greater Caucasus

机译：跟踪大高加索西部的沉积物来源和侵蚀演变

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This article investigates landscape characteristics and sediment composition in the western Greater Caucasus by using multiple methods at different timescales. Our ultimate goal is to compare short-term versus long-term trends in erosional processes and to reconstruct spatio-temporal changes in sediment fluxes as controlled by partitioning of crustal shortening and rock uplift in the orogenic belt. Areas of active recent uplift are assessed by quantitative geomorphological techniques [digital elevation model (DEM) analysis of stream profiles and their deviation from equilibrium] and compared with regions of rapid exhumation over longer time intervals as previously determined by fission-track and cosmogenic-nuclide analyses. Complementary information from petrographic and heavy-mineral analyses of modern sands and ancient sandstones is used to evaluate erosion integrated throughout the history of the orogen. River catchments displaying the highest relief, as shown by channel-steepness indices, correspond with the areas of most rapid exhumation as outlined by thermochronological data. The region of high stream gradients is spatially associated with the highest topography around Mount Elbrus, where sedimentary cover strata have long been completely eroded and river sediments display the highest metamorphic indices and generally high heavy-mineral concentrations. This study reinforces the suggestion that the bedrock-channel network can reveal much of the evolution of tectonically active landscapes, and implies that the controls on channel gradient ultimately dictate the topography and the relief along the Greater Caucasus. Our integrated datasets, obtained during a decade of continuing research, display a general agreement and regularity of erosion patterns through time, and consistently indicate westward decreasing rates of erosional unroofing from the central part of the range to the Black Sea.
机译：本文通过在不同时间尺度上使用多种方法研究了大高加索西部地区的景观特征和沉积物组成。我们的最终目标是比较侵蚀过程的短期和长期趋势，并重建造山带中地壳缩短和岩石隆起的划分控制的沉积物通量的时空变化。最近活跃的隆起区域通过定量地貌学技术[河流剖面的数字高程模型（DEM）分析及其与平衡的偏离]进行了评估，并与先前通过裂变径迹和宇宙成因核素确定的较长时间间隔内的快速发掘区域进行了比较分析。来自现代沙子和古代砂岩的岩石学和重矿物分析的补充信息用于评估整个造山带历史中的侵蚀综合。如河道-陡度指数所示，流域显示出最高的泄洪量，与热年代学数据所概述的最快发掘尸体的区域相对应。高流梯度区域在空间上与Elbrus周围的最高地形相关联，在那里沉积覆盖层早已被完全侵蚀，河流沉积物表现出最高的变质指数和通常较高的重矿物浓度。这项研究加强了这样的建议，即基岩-河道网络可以揭示大部分构造活动景观的演变，并暗示对河道坡度的控制最终决定了大高加索地区的地形和地形。在十年的持续研究中获得的我们的综合数据集显示了侵蚀模式随时间变化的总体一致性和规律性，并始终表明从山脉中心到黑海的侵蚀解顶率向西递减。

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