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Caught in the act: Implications for the increasing abundance of mafic enclaves during the recent eruptive episodes of the Soufrière Hills Volcano, Montserrat
| Content Provider | Semantic Scholar |
|---|---|
| Author | Barclay, Jenni Herd, Richard A. Edwards, Ben R. Christopher, T. Kiddle, E. J. Plail, Melissa Donovan, Amy |
| Copyright Year | 2010 |
| Abstract | [1] An exceptional opportunity to sample several large blocks sourced from the same region of the growing Soufriere Hills lava dome has documented a significant increase in the presence of mafic enclaves in the host andesite during the course of a long-lived eruptive episode with several phases. In 1997 (Phase I) mafic inclusions comprised ∼1 volume percent of erupted material; in 2007 (Phase III) deposits their volumetric abundance increased to 5–7 percent. A broader range of geochemically distinctive types occurs amongst the 2007 enclaves. Crystal-poor enclaves generally have the least evolved (basaltic) compositions; porphyritic enclaves represent compositions intermediate between basaltic and andesitic compositions. The absence of porphyritic enclaves prior to Phase III magmatism at Soufriere Hills Volcano suggests that a mixing event occurred during the course of the current eruptive episode, providing direct evidence consistent with geophysical observations that the system is continuously re-invigorated from depth. |
| File Format | PDF HTM / HTML |
| DOI | 10.1029/2010GL042509 |
| Alternate Webpage(s) | https://ueaeprints.uea.ac.uk/27282/1/Barclay_et_al_2010.pdf |
| Alternate Webpage(s) | https://doi.org/10.1029/2010GL042509 |
| Volume Number | 37 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
