Tracing Ignimbrite Calderas and Provenance in Southern Peru
Final Report Abstract
The Central Andes represent one of the world's largest Miocene ignimbrite provinces. The timing, cause, and location of "ignimbrite flare ups" during the evolution of the Central Andean uplift has been the overriding topic of this project. Unravelling volcano-tectonic structures and calderas with shallow intrusive or subvolcanic stocks, that are often related to mineralization of significant economic value has been an subordinate goal. This second goal turned out to be difficult to follow (for reasons detailed below) and therefore has not been followed as initially envisioned in the proosal. Our efforts were supported by collaboration with Dr. Mirian Mamani (IGEMMET, Peru) and through a collaboration with the Pontifica Universidad de Peru. We applied an integrated approach in attempts to locate the caldera sources of Miocene ignimbrites in southern Peru and to place temporal and genetic constraints on the origin and crust/mantle mass balance of ignimbrite magmatism in the Central Andes through time and space. In doing so, we extended the regional as well as methodological scope to study ignimbrite towards the entire Central Andes, not only to a few selected regions in southern Peru as originally presented n the proposal.
Publications
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(2010) Remote sensing of Carhuarazo volcanic complex using ASTER imagery in Southern Peru to detect alteration zones and volcanic structures – a combined approach of image processing and ENVI and ArcGIS/Arcscene. Geocarto International 25: 629-648
Brandmeier M
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(2013) Mapping patterns of mineral alteration in volcanic terrains using ASTER data and field spectrometry in Southern Peru. J South Am Earth Sci 48: 296-314
Brandmeier M, Erasmi S, Hansen C, Höweling A, Nitzsche K, Ohlendorf T, Mamani M, Wörner G
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(2014) Automated recognition of quasi-planar ignimbrite sheets as paleosurfaces via robust segmentation of digital elevation model: an example from the Central Andes. Earth Surface Processes and Landforms 39:1386-1399
Székely B, Koma S, Karátson D, Dorninger P, Wörner G, Brandmeier M, Nothegger C
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(2015) The source of Central Andean ignimbrite and andesite magmatism characterized by oxygen and strontium isotopes. Contrib Mineral Petrol 169: 58
Freymuth H, Brandmeier M, Wörner G
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(2016) Compositional variations of ignimbrite magmas in the Central Andes over the past 26 Ma - a multivariate statistical perspective. Lithos Volume 262, 1 October 2016, Pages 713-728
Brandmeier M, Wörner G
