The Shackleton Range of East Antarctica: unravelling a complex geological history via an integrated geochronological, geochemical and geophysical appr

南极洲东部的沙克尔顿山脉：通过综合地质年代学、地球化学和地球物理方法揭示复杂的地质历史

• 批准号: 2881843
• 金额: --
• 依托单位: University of St Andrews
• 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-2881843
• 关键词: Shackleton; Range; East; Antarctica; unravelling

The proposed project is a multidisciplinary geochemical, geochronological and geophysical study on rock collections and aeromagnetic data from the remote Shackleton Range of East Antarctica. This detailed analysis will substantially improve the geological understanding of the region and allow us to evaluate its role in the assembly of Antarctica.A multi-national effort to determine the geological evolution of the Shackleton Range in East Antarctica was conducted over 25 years ago during two summer expeditions involving several teams of European geologists (Euroshack Expedition). The result was impressive: a unified geology map and an exhaustive collection of rocks and fossils from across the mountainous region, and an analytical programme highlighting its complex history (Tessensohn and Thomson, 1999).Geological investigations since the Euroshack expedition have been limited, with the most comprehensive studies carried out by Will et al. (2009, 2010). This work has highlighted that the Shackleton Range is situated at a geological crossroads: traces of former mountain building events, many responsible for the suturing of crustal units and the assembly of the East Antarctic continent, either cross the Range or trend toward it (Figure) and have demonstrated that it and East Antarctica form key components in global paleogeographic reconstructions (Liu et al., 2018).Remote sensing and geophysical surveys conducted since the Euroshack expedition have highlighted evidence that the tectonic history for the Range is incomplete. Some areas have distinct magnetic responses yet rock exposures from these regions are largely unstudied, whereas other areas indicate a greater complexity than current tectonic models suggest. Importantly these unique geophysical signatures apparently continue into the interior of East Antarctic, indicating that an improved geophysical understanding of the Shackleton Range would help underpin a more comprehensive tectonic framework for East Antarctica within the context of supercontinent reconstruction.The student, based at the British Antarctic Survey (BAS) in Cambridge, will use the 1990's rock collection of the geophysically distinctive units held at BAS. Using the state of the art geochemistry and geochronology facilities at St Andrews University, a diverse set of isotopic compositions will be measured on grains, portions of grains for a variety of different minerals (e.g. U-Pb and Hf isotopes in zircon) and supplemented by whole-rock major and trace elements geochemistry. The student will use these data to update the geological evolution of the Shackleton Range, focussing on constraining the age and conditions of metamorphism and magmatism associated with the former mountain building events. The student will develop a high level of expertise in the use of mass spectrometry for isotopic and elemental analysis. This work will be carried out in close collaboration with the supervisors Gardiner (St Andrews), Riley (BAS) and Flowerdew (CASP) and the student will be embedded in research teams at both BAS (Cambridge) and St Andrews University.The improved understanding of how the various geophysical signatures developed and what they represent, contextualised into a comprehensive geological and tectonic history for East Antarctica and formerly adjacent regions, by the extrapolation of the geophysical anomalies away from the Range. In close collaboration with Ferraccioli (BAS), the student will be provided with enhanced training in the processing and interpretation of airborne geophysical data to evaluate the broader tectonic setting of the Shackleton Range. A possibility of comparative fieldwork in either the Gawler craton (Australia) or Kalahari craton (southern Africa) (Figure) will enable a broader view of the Proterozoic sequences.Overall the proposed project will determine a geological and tectono-metamorphic history of the Shackleton Range and evaluate its place in the assembly of East Antarctica

拟议的项目是一项关于岩石收集和航空磁数据的多学科地球化学，地质学和地球物理研究，来自南极洲东部的偏远沙克尔顿范围。这种详细的分析将大大改善该地区的地质理解，并使我们能够评估其在南极洲组装中的作用。在25年前，在涉及欧洲地质学家的几个团队（Euroshachack Experition）的两个夏季探险中，在25年前，南极洲的Shackleton范围的地质演变（EUROSHACK EXPERITION）在25年前进行了跨国努力。结果令人印象深刻：统一的地质图和来自山区各地的岩石和化石的详尽集合，以及一个分析计划，突出了其复杂的历史（Tessensohn and Thomson，1999）。由于Euroshack探险受到了限制，因此地质研究受到了威尔等人的最全面研究。 （2009，2010）。这项工作表明，沙克尔顿范围位于地质十字路口：以前的山区建筑事件的痕迹，许多负责地壳单元的缝合力以及东南极大陆的组装，跨越了范围或趋势，要么是朝着它的范围或趋势（图）（图），并且已经证明了它和东北大部分的关键组成部分，并在全球古地理上构造了liue and。自Euroshack Expedition以来进行的调查强调了证据表明该范围的构造历史是不完整的。某些区域具有不同的磁反应，但这些区域的岩石暴露在很大程度上没有研究，而其他区域则表明比当前模型所建议的更复杂。重要的是，这些独特的地球物理特征显然继续延续到东方东部的内部，表明对Shackleton范围的地球物理理解的改善将有助于基础在超联邦重建的背景下，在英国重建的学生中，在英国南极调查（Base）中，将在Cambridge中使用1990年的Rockys，该公司在campridge中使用了更全面的构造框架。使用圣安德鲁斯大学的最先进的地球化学和地球人工学设施，将根据谷物，各种不同矿物质的谷物部分（例如U-PB和HF同位素）（例如，氧化锆中的U-PB和HF同位素）来衡量各种同位素组合物，并由整个岩石和痕量大型和微量的大型和微量的大元素和痕量元素补充。学生将使用这些数据来更新沙克尔顿范围的地质演变，重点是限制与以前的山区建筑事件相关的变质和岩浆事件的年龄和状况。学生将在使用质谱法进行同位素和元素分析方面发展高水平的专业知识。这项工作将与主管Gardiner（St Andrews），Riley（Bas）和Flowerdew（CASP）密切合作，学生将嵌入BAS（Cambridge）和St Andrews University的研究团队中。地球物理异常的外推远离范围。在与Ferraccioli（BAS）的密切合作中，将为学生提供在空气中地球物理数据的处理和解释方面的增强培训，以评估Shackleton系列的更广泛的构造环境。在Gawler Craton（澳大利亚）或Kalahari craton（Minter Africa）（图）中进行比较实地调查的可能性将更广泛地了解proterorokoic序列。拟议的项目将确定地质和Tectono-Metamorphic shandamorphic历史