Volcanism and erosion during the past 930 k.y. at the Tatara-San Pedro complex, Chilean Andes
Article Abstract:
Chronostratigraphic analysis of the Tatara-San Pedro complex located in central Chile indicated the presence of a steep erosional topography due to repeated glacial advances. The region which is located on a transition zone between the southern and northern parts of the Chilean volcanic zone is composed of the Pellado and the Tatara-San Pedro volcanoes which developed in a period of 90-100 k.y. Furthermore, analysis of lava and erosional hiatuses in the area indicated the presence of successive glacial advances that caused multiple episodes of erosion.
Publication Name: The Geological Society of America Bulletin
Subject: Earth sciences
ISSN: 0016-7606
Year: 1997
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Geochemical constraints on the origin of mafic and silicic magmas at Cordon El Guadal, Tatara-San Pedro Complex, central Chile
Article Abstract:
The origin of basaltic and dacitic volcanic rocks could be traced by examining the crustal differentiation and melting processes of magmas present on Cordon El Guadal, Tatara-San Pedro Complex, Chile. The quantification of the crustal differentiation and the analysis of varying compositions of lavas in the area yielded important information regarding the formation of these volcanic rocks. The petrographic features of basaltic and dacitic volcanic rocks can be accounted for the complex crustal magmatic histories.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1998
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Calbuco Volcano and minor eruptive centers distributed along the Liquine-Ofqui Fault Zone, Chile (41 degrees-42 degrees S): contrasting origin of andesitic and basaltic magma in the Southern Volcanic Zone of the Andes
Article Abstract:
Differences in the geochemical characteristics of basaltic rocks collected from various minor eruptive centers and those gathered from Osorno and other southern Southern Volcanic Zone volcanoes were caused by differences in mantle melting and source water content. Analysis of basalt specimens also suggest that the unique geochemistry of rocks near Calbuco were due to a higher degree of assimilation of crust compared to other volcanoes in the area.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1995
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