Solving igneous and tectonic problems using detrital sedimentary petrology

利用碎屑沉积岩石学解决火成岩和构造问题

• 批准号: 2650-2011
• 负责人: PePiper, Georgia
• 金额: $ 2.04万
• 依托单位: Saint Mary's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=568254
• 关键词: Solving; igneous; tectonic; problems; using

Most continental margin sandstones and shales were derived from the adjacent continent, as sediment supplied by rivers. In ancient rocks, precisely determining how the sources of sandstones and shales have changed through time can be used to better understand volcanic activity and tectonics (faulting, uplift) in the source area. This grant proposal has two goals. First, to improve techniques for tracking sources of sediment to ancient rock successions, building on an extensive existing data base of mineralogical, geochronological and geochemical data from Cretaceous rocks of the Scotian Basin. The aim is by applying multiple techniques to achieve greater precision in identifying sources than is possible from one or two techniques. New procedures such as Mineral Liberation Analysis and hot-cathode cathodoluminescence will be applied, in a addition to "fingerprinting" and dating individual minerals. Second, to apply these techniques to four geological problems: (1) the tectonics of the Scotian Basin in the Early Cretaceous (100-140 Ma); (2) more generally, understanding uplift and tilting on the eastern Canadian margin and its role in supplying sediment to the adjacent basins; (3) identifying a possible Paleogene (~40 Ma) volcanic arc in southern Greece, important for understanding when subduction of the African plate beneath the Aegean microplate began; and (4) defining the stages of deformation and uplift in the main Hellenide mountain building phase in mainland Greece. In every case, better understanding the history of volcanism, faulting and uplift goes beyond local significance and has broader implications for geological processes elsewhere.

大多数大陆边缘砂岩和页岩是从邻近大陆作为河流提供的沉积物形成的。在古代岩石中，精确确定砂岩和页岩的来源如何随着时间的推移而变化，可以用来更好地了解源区的火山活动和构造（断层，隆起）。 这项赠款提案有两个目标。第一，改进追踪沉积物来源到古代岩石序列的技术，建立在斯科琴盆地白垩纪岩石的矿物学、地质年代学和地球化学数据的广泛现有数据库的基础上。其目的是通过应用多种技术来实现比一种或两种技术更高的来源识别精度。除了“指纹”和确定个别矿物的年代外，还将采用矿物解离分析和热阴极阴极发光等新程序。 第二，将这些技术应用于四个地质问题：（1）早白垩世斯科琴盆地的构造（2）更普遍地理解加拿大东部边缘的隆升和倾斜及其在向邻近盆地提供沉积物方面的作用;（3）在希腊南部确定了一个可能的古近纪（~40 Ma）火山弧，这对于了解非洲板块何时开始俯冲到爱琴海微板块之下具有重要意义;（4）确定了希腊大陆主要造山阶段的变形和隆升阶段。在每一种情况下，更好地了解火山作用、断层作用和隆起的历史都超出了当地的意义，对其他地方的地质过程有着更广泛的影响。