Computer Science
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.112...53m&link_type=abstract
Earth and Planetary Science Letters, Volume 112, Issue 1, p. 53-59.
Computer Science
8
Scientific paper
Mafic lava flows and scoria cone on the Altiplano-Puna plateau correlate spatially and temporalily with late Pliocene-Quternary strike-slip faulting. Thrust faulting dominated deformation in the plateau and adjacent foreland during the Miocene-Pliocene. The relations between faulting and mafic magmatism may be explained by a change from vertical to horizontal least principal compression during the Pliocene-Quaternary. A model in which mantle-derived mafic magma ascends through the thick, less dense continental crust of the Altiplano-Puna plateau suggests that nonlithostatic stress in the crust may have controlled the depth and geometry of intrusion. Horizontal nonlithostatic compression favored the formation of horizontal mafic intrusions in the lower crust, which may have thermally weakened the crust, localized crustal thickening, and caused crustal anatexis. Horizontal nonlithostatic tension favored vertical intrusions in the crust and surface eruption.
Emerman Steven H.
Marrett Randall
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