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OVERVIEW

Longevity and Dynamics of Rhyolitic Magma Systems

June 7–12, 2001 • Mammoth, California

Conveners:

Kurt Knesel
Department of Earth Sciences, University of Queensland, St. Lucia, Brisbane, Qld 4072, Australia, 61-7-33659779, fax 61-7-33651277
George Bergantz
Department of Geological Sciences, Office Box 351310, University of Washington, Seattle, WA 98195-1310, USA, (206) 685-4972, fax 206-543-3836
Jon Davidson
Department of Earth and Space Sciences, University of California, Los Angeles, CA 90095-1567, (310) 206-3042, fax 310-825-2779

Mammoth Mountain forms the southwest rim of the Long Valley caldera, one of three large Quaternary rhyolitic caldera centers in the United States. Long Valley, a site of recent volcanic unrest, lies at the heart of current debate over the mechanisms and time scales for the production, storage, and differentiation of rhyolite magma. Such information is critical to our understanding of fundamental geologic problems such as the formation and growth of Earth's continents and predicting volcanic hazards.

The conference aims to bring together petrologists, geochemists, volcanologists, and geophysicists actively studying the generation and evolution of silicic magmas. We hope to resolve—or at least constrain—a number of very important and currently highly topical issues pertaining to the shallow-crustal evolution of large, typically caldera-forming, silicic magma bodies. Issues include:

Keynote talks will outline the current state of knowledge concerning the generation and evolution of large rhyolitic magma systems and will set the foundation for evaluation of existing paradigms, development of new models, and discussion of future research directions. Most of the meeting will focus on poster sessions and group discussions. Mid-meeting field trips to selected Bishop Tuff and Sierran plutonic locations will serve to raise questions concerning limits and constraints on sampling and interpreting geochemical data from pyroclastic deposits based on our knowledge of how large silicic systems erupt, links between plutonic and volcanic environments, and the importance of recharge and mixing in magma evolution.

The conference is limited to approximately 50 participants to ensure a workshop atmosphere focussed on manageable discussions. We encourage participation of graduate students working on silicic magma systems; partial student subsidies will be available. The registration fee, which will include lodging, some meals, field trips, and all other conference costs except personal incidentals, is not expected to exceed $750. Information on travel to the conference will be provided in the letter of invitation.