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Online Investigation of an Island Arc Volcano: Anatahan, Mariana Arc

Online Investigation of an Island Arc Volcano: Anatahan, Mariana Arc. Jeff Ryan, Department of Geology University of South Florida. 2003-2005 Anatahan Eruptions. SubFac “event”: Successful event responses

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Online Investigation of an Island Arc Volcano: Anatahan, Mariana Arc

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  1. Online Investigation of an Island Arc Volcano: Anatahan, Mariana Arc Jeff Ryan, Department of Geology University of South Florida

  2. 2003-2005 Anatahan Eruptions • SubFac “event”: Successful event responses • Generous Web- and journal-published information resources, including comprehensive geochemical data on eruptive products. • A “typical” arc volcano erupting a “typical” suite of arc lavas in a “typical” (and well-documented) island arc setting = a good starting point for an investigation of subduction-related volcanism.

  3. Activity Learning Goals: • Web Research skills (Why? Undergraduates desperately need training in Information Quality Assessment, as they are bombarded with data, and don’t know how to filter it. • Geochemical Data interpretation: Learning basics of elemental partitioning and variations in lava compositions w/ varying degrees of crystallization/melting, as observed on simple x-y plots (e.g.: Hanson, 1989). • Geospatial Information access and Manipulation: Use of GIS tools (i.e. Google Earth, GeoMapApp).

  4. Part 1: Directed Web Research • Starting Place: http://www.nsf-margins.org/SF/Anatahan/Anatahan2003.html (Anatahan pages on NSF-MARGINS website) NOT Google! • Links here are to Source Reference websites and published literature (like searching the stacks in the library…) • Do the comparisons (i.e., “Where do these links appear in a Google search for Anatahan?”) to explain Web search engines and their limitations • Direct students to seek both basic information (geography, history), and geologically relevant data, especially bulk-rock chemical analyses and trace element results.

  5. Geospatial/Descriptive data resources • GIS applications: Google Earth, GeoMapApp, etc. • Eruptive history and style: MARGINS pages and linked websites Map of EM300 multibeam sonar bathymetry around Anatahan island, collected during the 2003 Ring of Fire expedition. Anatahan caldera (J.R. Lockwood)

  6. Extended Searching: Refereed literature online • GeoRef(JVGR special issues, etc.) • GERM(reservoir and partitioning data)

  7. “Chemical Petrology” Based on data in published literature. Basic rock classifications AFM relationships (calc-alkaline vs. Tholeiitic) Harker Diagrams, etc….

  8. Trace-element Geochemistry: Elemental Partitioning Basics

  9. Inferring Crystallization sequences Hanson, et al (1989) An Approach to Trace Element Modeling Using a Simple Igneous System as an Example (RIMG 21: Geochemistry and Mineralogy of the Rare Earth Elements) Interpretation of elemental variation patterns in terms of magmatic processes

  10. Assessment Strategies: • Students generate a report, responding to the questions posed. • Includes all diagrams generated, and data tables compiled, as well as a complete list of references used, Web and otherwise. • Evaluate based both on understanding of petrology/geochemistry principles, but also on the quality and of their searches. • Consider both the sources used, and how they are used (are they cited properly, are they source references?)

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