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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
Sprache Englisch
ISSN 1869-9510
Digitales Dokument URL
Erschienen In: Solid Earth ; 3, no. 2 ; Nr. 3, no. 2 (2012-07-12), S.191-198
Datensatznummer 250000982
Publikation (Nr.) Volltext-Dokument vorhandencopernicus.org/se-3-191-2012.pdf
 
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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