The History of Explosive Volcanism and Volcaniclastic Sedimentation Around Taal Caldera, Philippines

该项目将确定主要火山碎屑单元的地层学和范围，并分析它们的结构、相和点火沸石以及与之相关的涌浪和火山灰矿床的沉积特征。结合来自重新加工和原生沉积物的数据，将能够解释火山爆发和灾难性沉积的历史，包括火山碎屑流-火山岩的转变。这项研究将提供与几个不寻常和重要的问题有关的数据：1)塔尔岩浆系统中的火山口发育。2)镁铁质点火沸石的性质、它们的浅海相对应物以及向沉积物重力流的过渡。3)以前被认为是基准浪涌的大范围涌浪状矿床的侵位机制。所获得的地质信息以及与PHIVOLCS的合作的一个副产品将是更好地了解大马尼拉地区的火山和相关灾害。

This project will define the stratigraphy and extent of the major volcaniclastic units and analyze their textures, facies, and depositional characteristics of the ignimbrites and related surge and lahar deposits. Combination of data from the reworked and primary deposits will allow interpretation of the history of explosive volcanism and catastrophic sedimentation, including pyroclastic flow-lahar transitions. The study will yield data pertinent to several unusual and important problems: 1) Caldera development in the Taal magmatic system. 2) The nature of mafic ignimbrites, their shallow submarine equivalents, and transitions to sediment gravity flows. 3) The emplacement mechanisms of widespread surge-like deposits that have previously been attributed to base surges. A by-product of the geological information gained, and the collaboration with PHIVOLCS, will be an improved understanding of volcanic and related hazards for the Greater Manila region.