ANDEAN MAGMATISM FROM CRUSTAL TO CRYSTAL SCALE
Isotope compositions of magmas and Proterozoic basement allow to estimate the proportion of juvenile to recycled crustal input (20 to 50% at 30 to 90 km3/km*Ma) and thus to constrain the role of magmatic addition to crustal thickening during the past 35 Ma to less than 10%.
The extreme climate of the Atacama desert is an ideal playground to link processes of uplift, erosion, valley incision, and sedimentation and the way these are linked to, and constrained by, the composition and age of volcanic rocks. Geological and geochronological evidence date both, fossil ignimbrite surfaces on the Western Andean slope and the onset of formation of deep canyons to around 10 Ma, which is consistent with tectonic models and sedimentary records.
On the other end of scale, the evolution of individual magma batches, their sequence and evolution in individual Andean magma systems were reconstructed from micro meter zonation features in magmatic phenocrysts, high-resolution geochronology and U-series isotope analyses.
This talk presents - on the occasion of this session - a summary of our results over the past 25 years that involved a total of 78 co-authors on > 40 publications.
I wish to extend my deep appreciation to all my colleagues, students, and friends for their support.