Collaborative Research: Interactions between Incipient Continental Rifting, Fluvial Systems, and Regional Climate in Southern Africa: The Okavango-Makgadikgadi Complex, Botswana

合作研究：南部非洲早期大陆裂谷、河流系统和区域气候之间的相互作用：博茨瓦纳奥卡万戈-马卡迪卡迪综合体

• 批准号: 1714754
• 负责人: Zhixiong Shen
• 金额: $ 9.36万
• 依托单位: Coastal Carolina University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-08-01 至 2023-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1714754&HistoricalAwards=false
• 关键词: Collaborative; Research; Interactions; between; Incipient

The Okavango Rift Zone (ORZ) and Delta (OD), and the Makgadikgadi Paleo-Megalake (MPL) form adynamic system in northern Botswana, southern Africa, where tectonic activity, climate change,sedimentation, vegetation, fauna, and human influences interact with each other at various spatial andtemporal scales. This award provides support for a multidisciplinary study of the interactions and feedbacks between incipient continental rifting, drainage patterns, and Neogene/Quaternary regional climate in the ORZ-OD-MPL complex. The objectives are to develop: (i) a structural and tectonic model of the ORZ-OD; (ii) chronologies for the evolution of the OD and infilling phases of the MPL; and (iii) histories of drainage basin expansions and contractions of the complex climate/vegetation in the OD-MPL, and the links, or lack thereof, between the ORZ, OD, and MPL. The overarching scientific question is: to what degree tectonics interacted with surface processes and climate in the ORZ-MPL system, and what feedback loops were involved in this interaction to control the environmental evolution of central southern Africa since the Miocene?The PIs will use a combination of seismology and sediment cores to look at the geometry of the rift faults and sediment fill. The material from the cores will additionally be used to establish provenance of the sediment and build climate records. These two datasets from the cores will be used to assess the relative importance of climate (via variable erosion) versus tectonic control (river migration/capture, etc.) on sediment supply. A 2D numerical model will integrate these data to explore the effect of basin asymmetry and sediment loading and how these feedback into basin development via loading and strain localization.

Okavango Rift区（ORZ）和Delta（OD）以及Makgadikgadi Paleo-Megalake（MPL）形成了南部非洲波茨瓦纳（Botswana）北部的Adynamic System，在那里，构造活动，气候变化，沉积，植被，Fauna和人类的影响在各种Spatial spatial和spatempor salles和人类的影响下相互作用。该奖项为ORZ-OD-MPL综合体中初期大陆裂谷，排水模式和新金元/第四纪区域气候之间的相互作用和反馈提供了多学科研究。目标是发展：（i）ORZ-OD的结构和构造模型； （ii）MPL的OD和填充阶段演变的时间顺序； （iii）OD-MPL中复杂气候/植被的排水盆地膨胀和收缩的历史，以及ORZ，OD和MPL之间的联系或缺乏联系。 总体科学问题是：在多大程度上与ORZ-MPL系统中的表面过程和气候相互作用，以及这种相互作用中涉及哪些反馈回路，以控制中世纪中部非洲中部非洲的环境演化？自中新世以来，PIS将使用地震学和泥沙核心的组合来查看rift填充的几何形状。核心的材料还将用于建立沉积物的出处并建立气候记录。来自核心的这两个数据集将用于评估气候（通过可变侵蚀）与构造控制（河流迁移/捕获等）对沉积物供应的相对重要性。 2D数值模型将集成这些数据，以探索盆地不对称和沉积物加载的效果，以及如何通过加载和应变定位对盆地发育的反馈。