Mineralogical Society of Arizona Just now · November Program: “Geodes, Thunder Eggs, and Septarian Nodules: Structure and Origin” By Dick Zimmermann. For the November program, Dick Zimmermann will present a thorough and fascinating program on spherical rock structures containing minerals or agates. He will discuss the formation of these fascinating structures found in igneous and sedimentary rocks. Though similar in form, their origins are quite different. Igneous geodes are a primary geological structure formed during the cooling and solidification of certain lava flows. Sedimentary geodes are secondary structures formed by replacement of spherical concretions. As with the formation of the various spherical structures, there is extensive literature on agate formation and no current consensus. The understanding of these structures has been hampered by the limited scope of related studies. Generally, research teams study specimens of a specific type from a single location. Their conclusions may differ because the specimens they were studying were actually formed by a somewhat different process. A broader study, in which multiple research teams study the same specimens and where specimens from various locations and formations are included, might lead to a better understanding of the origins of Geodes, Thunder Eggs, and Septarian Nodules. Dick grew up in Wisconsin and attended University of Wisconsin for 1 year, left in 1973 to enlist in U.S. Air Force and currently lives in Tempe, AZ. He is an Aerospace Engineer and received his BSME (1967) and MSME (1972) from Arizona State University. The meeting will be held on November 13th in the Padre Serra room at the Franciscan Renewal Center, 5802 E. Lincoln Dr., Scottsdale, AZ. Arrive 7PM, Meeting at 7:30PM.
Posted on: Wed, 05 Nov 2014 01:18:16 +0000
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