Characterization of Quartz Coarse Silt Using Laser Micro- probe and Objective Cathodoluminesence

使用激光显微探针和物镜阴极发光表征石英粗粉砂

• 批准号: 9017764
• 负责人: Stephen Kennedy
• 金额: $ 5.94万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-06-01 至 1993-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9017764&HistoricalAwards=false
• 关键词: Characterization; Quartz; Coarse; Silt; Using

The quartz sediment provided by various source rocks can be characterized on the basis of physical and chemical properties. Both have been used to evaluate the sources of quartz sand although the physical properties have been emphasized. Chemical properties have been used to characterize whole sediment samples (a mixture of sediment size and mineral composition) or multiple grains of a single mineral component but generally not for individual grains and specifically not for fine-grained quartz. Indirect chemical properties observed using subjective cathodoluminescence (CL) petrography is applied to individual sand grains, but generally not for the finer quartz grains. Quartz coarse silt is an important component of mudrocks. The purpose of this pilot study is to characterize attributes of quartz not previously determined on these fine particles. LAMMA laser microprobe and objective CL petrography will be used to document characteristics of quartz coarse silt liberated from various source rocks in a single drainage system. Quartz coarse silt will be collected from several first order streams each draining a single known source rock in the James River drainage basin. This quartz sediment from each source as well as the quartz in the source rock will be characterized using the two techniques. This quartz, thus fingerprinted, can then be attributed to specific source rocks. There are two immediate and major applications of this pilot study. First, demonstration of the ability of these techniques to identify source rock of quartz sediment will allow further studies to determine the dominant lithologies contributing silt to modern muddy environments, a topic presently debated but possibly not solvable with the commonly used tools at present. Second, because the characteristics analyzed by these techniques are not expected to be affected by diagenetic processes, they have the potential to evaluate the sources of silt in mudrocks if it can be shown that source rock types have unique and predictable characteristics.

各种源岩提供的石英沉积物可以根据物理和化学特性来表征。 尽管已经强调了物理特性，但两者都被用来评估石英砂的来源。 化学特性已用于表征整个沉积物样品（沉积物尺寸和矿物质成分的混合物）或单个矿物质成分的多种晶粒，但通常不适合单个晶粒，尤其不是用于细粒的石英。 使用主观阴极发光（CL）岩石学观察到的间接化学特性应用于单个砂粒，但通常不适用于较细的石英晶粒。 石英粗淤泥是泥岩的重要组成部分。 这项试验研究的目的是表征石英的属性先前未在这些细颗粒上确定。 Lamma Laser微探针和物镜CL岩石学将用于记录单个排水系统中各种源岩石的石英粗淤泥的特征。 石英粗淤泥将从几个一阶溪流中收集，每个流在詹姆斯河排水盆地中排出一个已知的源岩石。 来自每个来源的石英沉积物以及源岩石中的石英将使用两种技术来表征。 因此，该石英被指纹识别可以归因于特定的源岩。 这项试点研究有两个直接和主要应用。 首先，证明这些技术鉴定石英沉积物源岩石的能力将允许进一​​步的研究来确定造成现代泥泞环境的淤泥的主要岩性，这一主题目前是辩论的，但目前可能无法使用常用的工具来解决。 其次，由于预计由这些技术分析的特征不会受到成岩化过程的影响，因此，如果可以证明源岩石类型具有独特且可预测的特征，它们有可能评估泥岩中淤泥的来源。