Microstructural development in ductile deformed metapelitic-metapsamitic rocks
- Author(s)
- Sergio Delpino, Marina Rueda, Ivana Urraza, Bernhard Grasemann
- Abstract
The Pringles Metamorphic Complex, located in the central sector of the Sierra de San Luis, Argentina, is characterized by a several kilometers wide ductile shear zone developed over a geothermal gradient variable between greenschist and granulite facies. The main component of the geothermal gradient comes from the intrusion of mafic-ultramafic bodies in a sequence of metapelitic-metapsamitic rocks. The relative compositional monotony of the original country-rocks and the systematic variation of thermal conditions along profiles normal to the NNE general trend of the structures, make this area a suitable natural laboratory to study ductile deformation. The present work combines field surveys and detailed petrographic-microstructural studies with phase relation analyses, geochemistry of rocks and minerals, and geothermobarometry. The construction of a suitable pseudosection together with geothermobarometric studies, allowed us to draw a reliable thermal curve for the mylonitization event along a representative cross-section. This study aims to give the field geologists the basic tools for a quick identification of deformation microstructures in polymineral aggregates, and correlation with temperatures during the development of mylonitic shear zones in metapelitic-metapsamitic rocks.
- Organisation(s)
- Department of Geology
- External organisation(s)
- Universidad Nacional del Sur
- Pages
- 224-249
- No. of pages
- 26
- DOI
- https://doi.org/10.1002/9781118844953.ch14
- Publication date
- 12-2015
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 105124 Tectonics
- Keywords
- ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/microstructural-development-in-ductile-deformed-metapeliticmetapsamitic-rocks(c54c2ccc-d91d-4889-890f-4e2efde302ee).html