FOLDS PRODUCED BY GRAVITY SPREADING OF A BANDED RHYOLITE LAVA FLOW

Citation
Jv. Smith et Ec. Houston, FOLDS PRODUCED BY GRAVITY SPREADING OF A BANDED RHYOLITE LAVA FLOW, Journal of volcanology and geothermal research, 63(1-2), 1994, pp. 89-94
Citations number
23
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geology
ISSN journal
0377-0273
Volume
63
Issue
1-2
Year of publication
1994
Pages
89 - 94
Database
ISI
SICI code
0377-0273(1994)63:1-2<89:FPBGSO>2.0.ZU;2-W
Abstract
Recumbent folds near the top of the Minyon Falls banded rhyolite flow, in northeastern New South Wales, Australia, indicate lateral radial e xtension of lava as it flowed from the vent under the influence of gra vity. These structures occur near the vent of the flow and differ from the upright folds commonly observed near the tops of lava flows. Fart her from the vent, the fold patterns indicate lateral radial shortenin g and shearing as the spread of lava was impeded. Interpretation of th e folds leads to a kinematic model of coaxial flow near the vent gradi ng to simple shear and sub-simple shear away from the vent.