Ludmila Maria Fonseca Teixeira

GMPV Geochemistry, Mineralogy, Petrology & Volcanology

The 2022 Outstanding Student and PhD candidate Presentation (OSPP) Award is awarded to Ludmila Maria Fonseca Teixeira for the poster/PICO entitled:

Subsolidus crystallization in the A-type Pikes Peak batholith (Fonseca Teixeira, L. M.; Troch, J.; Allaz, J.; Bachmann, O.)

Click here to download the poster/PICO file.

Ludmila Fonseca Teixeira is a PhD student at the Institute of Geochemistry and Petrology at ETH Zürich, Switzerland, working under the supervision of Olivier Bachmann and Juliana Troch. Her research aims at understanding the processes that occur within a magma chamber as pegmatites are derived from granites, focusing on the magmatic-hydrothermal transition and its related thermal, textural and chemical consequences that can be observed in the mineralogy of the rocks.

Her contribution at EGU General Assembly 2022 focuses on a classic A-type granite, the Pikes Peak Batholith (Colorado, USA), demonstrating that fluids derived from the granitic melt crystallise below the traditionally accepted solidus (650-700°C; Luth et al., 1964; Piwinskii, 1968; Tuttle & Bowen, 1958) forming rims in quartz and plagioclase in the granite. Although a substantial process in the batholith, fluid crystallisation is limited to 20% of the quartz in the granite. This event is associated with the progressive enrichment in water and other volatile elements during “second boiling”, inducing the magmatic-hydrothermal transition, and sourcing the pegmatite dykes and pods within the pluton.