The Relationship of Textures and Depositional Structures in Pyroclastic-flow Deposits to Paleomagnetically Determined Emplacement Temperatures

火山碎屑流沉积物中的结构和沉积结构与古地磁确定的就位温度的关系

• 批准号: 9316538
• 负责人: Gary Smith
• 金额: $ 9.44万
• 依托单位: University of New Mexico
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-01-01 至 1998-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9316538&HistoricalAwards=false
• 关键词: Relationship; Textures; Depositional; Structures; Pyroclastic

9316538 Smith Remarkably little is known about the temperature at which pyroclastic particles are transported. Many factors, other than the initial magma temperature, are known to affect the emplacement temperature of pyroclastic flows. these factors are known, or hypothesized, to be related to descriptive and quantifiable textural and structural characteristics of pyroclastic-flow deposits (ignimbrites), including vesicularity, grain-size distribution, grain morphology, bedding structures, and grading profiles. In this study, these characteristics will be compared to emplacement temperatures estimated by application of established rock-magnetism methods to previously well- studied ignimbrites. The same approach will also be utilized to investigate a pyroclastic-flow deposit that was the product of a subaerial eruption but can be traced from the subaerial setting to a subaqueous depositional environment. Establishment of the thermal and textural changes of the deposit that occur in the transition will be critical to ongoing controversy on the nature of such transitions, which are critical to understanding pyroclastic- flow transport.

9316538史密斯关于火山碎屑颗粒被搬运的温度知之甚少。 除了初始岩浆温度外，已知许多因素会影响火山碎屑流的侵位温度。 这些因素是已知的或假设的，与火山碎屑流沉积物（熔结凝灰岩）的描述性和可量化的结构和结构特征有关，包括泡状、粒度分布、颗粒形态、层理结构和分级剖面。 在这项研究中，这些特征将被比较，通过应用既定的岩石磁学方法估计侵位温度，以前充分研究熔结凝灰岩。 同样的方法也将被用来调查火山碎屑流存款，是一个陆上喷发的产品，但可以追溯到从陆上设置到水下沉积环境。 建立的热和结构变化的存款发生在过渡将是至关重要的持续争论的性质，这种过渡，这是至关重要的了解火山碎屑流运输。