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| Titel |
Strength and permeability recovery of tuffisite-bearing andesite |
| VerfasserIn |
S. Kolzenburg, M. J. Heap, Y. Lavallée, J. K. Russell, P. G. Meredith, D. B. Dingwell |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 3, no. 2 ; Nr. 3, no. 2 (2012-07-12), S.191-198 |
| Datensatznummer |
250000982
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| Publikation (Nr.) |
 copernicus.org/se-3-191-2012.pdf |
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| Zusammenfassung |
| Tuffisites, the products of subsurface fragmentation, transport and
deposition, are common in explosive volcanic environments. Their study
provides direct insight to the mechanical processes operating within
volcanic conduits. Here we document the influence of the presence of
coherent tuffisite veins on the physical properties of andesitic rocks. We
find that (1) compressive strength is unaffected by the presence and/or
orientation of tuffisites, (2) permeability doubles when tuffisites are
oriented favorably (at 45° to the fluid flow direction), and (3)
ultrasonic wave velocities show a continuous increase with depth,
independent of vein presence and orientation. Although the influence of
tuffisites on andesitic rock properties determined here is modest, we
emphasize that the material tested represents the post-eruptive state of
tuffisite. Thus, these results likely delineate the upper and lower
boundaries of strength vs. permeability and porosity, respectively. Our
evidence suggests that, via compaction and lithification, tuffisites may
restore the strength of the volcanic host-rocks to that of their
pre-tuffisite values. |
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