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

[9316538]史密斯对于火山碎屑颗粒运输的温度，我们所知甚少。除初始岩浆温度外，已知有许多因素影响火山碎屑流的就位温度。这些已知或假设的因素与火山碎屑流沉积（火成岩）的描述性和可量化的结构和结构特征有关，包括囊泡性、粒度分布、颗粒形态、层理结构和分级剖面。在这项研究中，这些特征将与通过应用已建立的岩石磁学方法对先前已得到充分研究的火烟煤估计的就位温度进行比较。同样的方法也将用于研究一种火山碎屑流沉积，这种沉积是地面喷发的产物，但可以从地面环境追溯到水下沉积环境。建立发生在过渡时期的矿床的热变化和结构变化将对目前关于这种过渡性质的争论至关重要，这对理解火山碎屑流输运至关重要。

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.