Direct observation of a young igneous system: a proposal for research drilling at Katmai, Alaska

Eichelberger, J; Hildreth, Wes; Papike, J

Drilling observations in a young igneous system soon after a single, well-described volcanic event would greatly improve our understanding of magmatic and hydrothermal processes and of the rates at which such processes operate. As part of the Continental Scientific Drilling Program (CSDP), we propose a program of coring and closely related research to investigate active silicic igneous processes at the site of the historically important 1912 eruption at Katmai, Alaska. Primary objectives of the project are to: 1. Test and improve physical and chemical models for silicic eruptions through three-dimensional investigation of a well-preserved ash-flow sheet/vent system. 2. Determine the source, mechanisms, and conditions of the fumarolic transport of metals that occurred following ash-flow emplacement by means of geochemical profiles through a system not yet degrated by weathering or alteration. 3. Establish the rates and mechanisms of ongoing cooling through measurement and interpretation of equilibrium temperature profiles and hydrothermal mineral assemblages in core holes within a simple system of known very young age. The proposed observations will provide the first view of early post-emplacement conditions in a major igneous system. Results will be applicable to assessing the course and hazards of explosive eruptions, understanding factors controlling ore formation, and predicting the lifetime of heat sources in the crust.

Direct observation of a young igneous system: a proposal for research drilling at Katmai, Alaska

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