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Zircon from historic eruptions in Iceland: reconstructing storage and evolution of silicic magmas |
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| Authors: | Tamara L Carley Calvin F Miller Joseph L Wooden Ilya N Bindeman Andrew P Barth |
| Institution: | 1. Department of Earth & Environmental Sciences, Vanderbilt University, PMB 351805, 2301 Vanderbilt Place, Nashville, TN, 37235-1805, USA 2. Stanford-USGS Micro Analysis Center, SHRIMP Lab, Stanford University, Green Earth Sciences Building, 367 Panama Street Room 89, Stanford, CA, USA 3. Department of Geological Sciences, University of Oregon, 1272 University of Oregon, Eugene, OR, 97403, USA 4. Department of Earth Sciences, Indiana University-Purdue University, Indianapolis, 723 West Michigan Street, SL118, Indianapolis, IN, 46202, USA |
| Abstract: | Zoning patterns, U-Th disequilibria ages, and elemental compositions of zircon from eruptions of Askja (1875 AD), Hekla (1158 AD), ?r?faj?kull (1362 AD) and Torfaj?kull (1477 AD, 871 AD, 3100 BP, 7500 BP) provide insights into the complex, extended, histories of silicic magmatic systems in Iceland. Zircon compositions, which are correlated with proximity to the main axial rift, are distinct from those of mid-ocean ridge environments and fall at the low-Hf edge of the range of continental zircon. Morphology, zoning patterns, compositions, and U-Th ages all indicate growth and storage in subvolcanic silicic mushes or recently solidified rock at temperatures above the solidus but lower than that of the erupting magma. The eruptive products were likely ascending magmas that entrained a zircon ??cargo?? that formed thousands to tens of thousands of years prior to the eruptions. |
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