Luminescence dating a tool to interrogate multi-scale coastal landscape response, Cape south coast, South Africa.

发光测年是一种询问多尺度沿海景观响应的工具，南非开普敦南海岸。

• 批准号: 2902338
• 金额: --
• 依托单位: University of Leicester
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2902338
• 关键词: Luminescence; dating; tool; interrogate; multi

The South African coast is a key region for Neogene and Pleistocene sea level studies (Hearty et al. 2020). Along the Western and Eastern Cape Provinces, thick sequences of cemented coastal deposits (dunes and near-shore deposits) form an archive of climatic and landscape change, as well as preserving numerous trace fossils (Helm et al., 2020) and evidence of human occupation (Helm et al., 2018). This project will interrogate these coastal sedimentary archives at two scales:1. The long-term timing of onshore dune and shoreline emplacement broadly equates to high interglacial sea-levels (Bateman et al., 2011), with coastal dune formation on the continental shelf during low-stands (Cawthra et al 2018). However, variability in the peri-coastal stratigraphic record is imparted by the interplay of (inherited) sediment supply and offshore topography (Carr et al., 2019) and we predict more complex scenarios exist, particularly in areas with a narrower coastal shelf. This is exciting as it offers scope to drill into far broader questions of diverse coastal landscape evolution(s) via, high-density geochronological sampling closely accompanied by targeted geophysical surveying.2. Today parts of the coastline are rapidly eroding due to sea level rise and relatively soft Pleistocene coastal sediments. This occurs in the face of burgeoning coastal development. This project will investigate the potential of luminescence rock surface dating methods to estimate the timing and rates coastal cliff erosion and to test the potential to date the displacement of large blocks from cliffs and shore platforms; the latter include potential storm surge and tsunami deposits (e.g. Brill et al., 2021). The potential of surface exposure luminescence dating methods is still being realised, but this approach - in a region rich in quartz with suitable luminescence properties - may offer entirely new insights into shorter-term coastal landscape change, and contribute to better-defining regional coastal hazards. This project will primarily employ luminescence dating methods, in conjunction with other surveying techniques, to interrogate coastal landscape processes over multiple spatial-temporal scales. The student will focus on the development of the new luminescence dating chronologies at Leicester, in collaboration with researchers from the Council for Geoscience, South Africa.

南非海岸是新金元和更新世海平面研究的关键地区（Hearty等，2020）。沿西开普省和东开普省，厚厚的胶结沿海沉积物（沙丘和近岸沉积物）构成了气候变化和景观变化的档案，并保留了许多痕量化石（Helm等，2020）和人类职业的证据（Helm等，2018）。该项目将以两个尺度询问这些沿海沉积物档案：1。陆上沙丘和海岸线的长期时机大致相当于高冰间海平面（Bateman等，2011），在低架期间，大陆架子上的沿海沙丘形成（Cawthra等人，2018年）。然而，（遗传）沉积物供应和近海地形的相互作用可以赋予地层周期地层记录的可变性（Carr等，2019），我们预测存在更复杂的情况，尤其是在沿海架子较窄的地区。这是令人兴奋的，因为它提供了范围，可以通过高密度的地球学采样伴随有针对性的地球物理测量来探讨各种沿海景观进化的问题。2。如今，由于海平面上升和相对柔软的更新世海岸沉积物，海岸线的部分地区正在迅速侵蚀。这发生在迅速发展的沿海发展中。该项目将研究发光岩石表面约会方法的潜力，以估计时间和对沿海悬崖的侵蚀进行评估，并测试可能是从悬崖和岸上平台中占用大块的潜力；后者包括潜在的风暴潮和海啸沉积物（例如Brill等，2021）。表面暴露发光约会方法的潜力仍在实现，但是这种方法 - 在具有合适发光特性的石英区域中，可能会为较短的沿海景观变化提供全新的见解，并有助于更好地定义区域沿海危害。该项目将主要采用发光约会方法，并结合其他测量技术来询问多个时空尺度上的沿海景观过程。该学生将专注于与南非地球科学委员会的研究人员合作，在莱斯特的新发光约会时间表的发展上。