Abstract
The Lower Paleozoic Silgará Formation in the southwestern Santander Massif was affected by Caledonian regional metamorphism, which created a sequence of metamorphic zones (sillimanite, staurolite, garnet, and biotite). The regional metamorphic grade of the Silgará Formation decreases southwestward from the sillimanite zone to the biotite zone. Metamorphism has occurred under low to high temperature and medium pressure conditions (Barrovian-type metamorphism) and reflects the high heat flow in this part of the Santander Massif. P– T conditions (495–518 °C and 4.4–5.5 kbar garnet zone; 590–612 °C and 6.6–7.5 kbar staurolite zone; 660–700 °C and 5.5–7.2 kbar sillimanite zone) were estimated by different thermometers and barometers. The Silgará Formation shows evidence of a complex metamorphic evolution characterized by crustal thickening during heating and a regional retrograde metamorphism after the peak metamorphic temperature.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
