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Morphology and dimensions of the young comendite lavas of La Primavera volcano, Mexico

Published online by Cambridge University Press:  01 May 2009

B. J. Clough ,
J. V. Wright  and
G. P. L. Walker
B. J. Clough
Affiliation:
Seltrust Mining Corporation, 174 Greenhill Road, Parkside, Adelaide, South Australia 5063, Australia
J. V. Wright
Affiliation:
Department of Earth Sciences, Monash University, Clayton, Victoria 3168, Australia
G. P. L. Walker
Affiliation:
Hawaii Institute of Geophysics, 2525 Correa Road, Honolulu, Hawaii 96822, U.S.A.
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Summary

Quantitative data on the rhyolitic lavas of the Quaternary La Primavera volcano, Mexico, are presented. Lavas vary in form from domes and mesa lavas to short coulées. Average thickness is 100 m, average surface area is 2.7 km2 and aspect ratios vary from 1:7 to 1:25. Two petrological lava types are distinguished – porphyritic and aphyric. Porphyritic lavas occur on or within an inner ring fracture and are associated with an area of caldera lake deposits. Many features suggest that these porphyritic lavas were emplaced into the wet sediments or water of the caldera lake. Aphyric lavas are largely found to the south of this region and form large polygenetic structures extruded on dry land. The porphyritic lavas generally are smaller and have higher aspect ratios than the aphyric, which are attributed to their special environment of emplacement. Some porphyritic lavas extruded on dry land, outside the region occupied by the caldera lake, are, however, the thinnest on the volcano.

Type
Articles
Information
Geological Magazine , Volume 119 , Issue 5 , September 1982 , pp. 477 - 485
Copyright
Copyright © Cambridge University Press 1982

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