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.

Chile, Environmental aspects, Geology, Stratigraphic, Stratigraphy, Glacial epoch, Ice age, Erosion, Erosion (Geology), Volcanism

---

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.

Magma, Dacite

---

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.

Research, Andes, Geochemistry

Similar abstracts:

• Abstracts: Tectonic burial, thrust emplacement, and extensional exhumation of the Cabot nappe in the Appalachian hinterland of Cape Breton Island, Canada
• Abstracts: Pyroxene in enclaves and syenites of the Red Hill complex, New Hampshire: an ion and electron microprobe study
• Abstracts: Partial melting of the Appin Quartzite driven by fracture-controlled H2O infiltration in the aureole of the Ballachulish Igneous Complex, Scottish Highlands
• Abstracts: Deep seismic profile of the Amazonian craton (Northern Brazil). Crustal architecture of the southern Uralides from true amplitude processing of the Urals Seismic Experiment and Integrated Studies (URSEIS) vibroseis profile
• Abstracts: Entropy dependence of viscosity and the glass-transition temperature of melts in the system diopside-anorthite

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.