| Abstract: | Rare melt inclusions ~100 ??m in diameter trapped near the boundaries of corroded patchy zones in plagioclase phenocrysts from Plinian pumice of three Holocene eruptions were analyzed by IR spectroscopy for molecular H2O, OH groups, and CO2 and by electron microprobe for Cl and F. The three rhyodacitic eruptions, each of which began with a Plinian phase, occurred over ~200 yr. The Llao Rock and Cleetwood eruptions ended with degassed lava flows and the subsequent climatic eruption with voluminous ignimbrite. Location of melt inclusions near boundaries of patchy zones, which are mantled by oscillatory-zoned overgrowths, suggests that their H2O concentrations represent magmatic values significantly before eruption. -from Authors |
| Genre: | Article |
| ProdID: | 70016941 |
| Citation Author: | Bacon, C. R.; Newman, S.; Stolper, E. |
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| Citation End Page: | 1030 |
| Citation Issue: | 9-10 |
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| Citation Language: | English |
| Citation Larger Work Title: | American Mineralogist |
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| Citation Number Of Pages: | 10 |
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| Citation Search Results Text: | Water, CO2, Cl, and F in melt inclusions in phenocrysts from three Holocene explosive eruptions, Crater Lake, Oregon; 1992; Article; Journal; American Mineralogist; Bacon, C. R.; Newman, S.; Stolper, E. |
| Citation Start Page: | 1021 |
| Citation Volume: | 77 |
| Citation Year: | 1992 |
| Type: | citation/reference |
| Text: | Water, CO2, Cl, and F in melt inclusions in phenocrysts from three Holocene explosive eruptions, Crater Lake, Oregon; 1992; Article; Journal; American Mineralogist; Bacon, C. R.; Newman, S.; Stolper, E. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1992 00:00 -0600 |
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