Tectonics and climate in a low-latitude rift: rift-shoulder denudation and sedimentation processes in northern Lake Malawi

马拉维湖是东非大裂谷的一个组成部分，包含了重要的低纬度古气候记录，反映了气候变化对侵蚀和裂谷沉积的影响。现有的高分辨率地震反射剖面网络（3 000公里长）为确定和量化北方马拉维裂谷的质量通量和沉积量提供了极好的机会。以前的工作已经确定了100 kyr的沉积旋回的成像地震包。一个流域范围内的分析，这一数据集与相关的地震包，并与长期剥蚀率来自热年代学（U-Th/He，磷灰石裂变轨迹）的比较，将有助于评估侵蚀和沉积过程的多种气候变化的影响。结合对现有岩芯的地质年代学工作，以及从马拉维湖北方未来ICDP钻探中获得的信息，拟议的地震地层包分析和裂谷肩岩的低温热年代学将导致活动裂谷中沉积作用的改进模型。此外，预期的结果将确定气候与构造过程在裂谷沉积中的重要性。

Lake Malawi is an integral part of the East African Rift and contains an important low-latitude paleoclimate record reflecting the influence of climatic changes on erosion and rift sedimentation. An available network of high resolution seismic reflection profiles (3000 km length) provides an outstanding opportunity to characterize and quantify mass flux and sediment volumes in the northern Malawi Rift. Previous work has identified 100 kyr sedimentary cycles in the imaged seismic packages. A basin-wide analysis of this dataset with correlated seismic packages, and comparison with long-term denudation rates derived from thermochronology (U-Th/He; apatite fission track) will help assess the influence of multiple climate changes on erosion and sedimentation processes. In conjunction with geochronologic work on existing drill cores, and information to be obtained from future ICDP drilling in northern Lake Malawi the proposed analysis of seismic stratigraphic packages and low temperature thermochronology of rift-shoulder rocks will result in an improved model of sedimentation in an active rift. In addition, the expected results will determine the importance of climate vs. tectonic processes in rift sedimentation.