ISSN:
1432-0819
Keywords:
dome
;
submarine
;
dacite
;
micro-structure
;
groundmass
;
Miocene
;
Japan
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
Notes:
Abstract Microscopic shear zones have been found in the groundmass of glassy rocks of a Miocene submarine dacite dome in southwest Japan. Similar textures have been reported previously but only in dykes. These textures give a valuable insight into the deformation of the dome during its emplacement by recording the orientations of the principal strains. Detailed textural analysis indicates that the microshear zones formed as a result of flattening and stretching of the magma simultaneously with quenching. Measured stretching directions are near-parallel suggesting the magma flowed in one dominant direction rather than in a radial pattern. The strain is believed to also be influenced by high magma pressure inside the dome being imposed on the high viscosity outer part of the dome.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00302003
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