RT Book, Section
T1 Size evolution of micropyrite from diagenesis to low-grade metamorphism
A1 Cárdenes, Víctor
A1 Merinero Palomares, Raúl
A1 López-Mungira, Aurora
A1 Rubio Ordoñez, Álvaro
A1 Pitcairn, Iain K.
A1 Cnudde, Veerle
AB Size distribution and evolution of framboidal and euhedral microscopic crystals of pyrite (micropyrites, MPy) have been used for the last thirty years to deduce palaeo-redox conditions. The analysis of the MPy distributions can give valuable information about these palaeo-redox conditions. However, other information can also be retrieved from this type of analysis. In this work, we propose that the formation of new populations of MPy is a proxy of the transition from the anchizone to the epizone. High-resolution X-ray tomography (micro-CT) was used to determine the size distributions of MPy hosted in pelitic rocks subjected to different grades of low temperature metamorphism. These data were filtered and statistically analysed, which allowed us to find a statistical representative size distribution of the MPy present in the samples. The metamorphic grade was determined using the Kübler Index in combination with petrological and scanning electron microscopy (SEM) examination. The results show a relationship between metamorphic grade and MPy size distributions, and that new populations of MPy formed due to the effects of metamorphism. This new methodology for MPy size distribution has different potential applications in some fields of Earth sciences, such as palaeoenvironment reconstruction, ore mining or metamorphic petrology.
PB Geological Society
SN 978-1-78620-400-4
YR 2019
FD 2019
LK https://hdl.handle.net/20.500.14352/13998
UL https://hdl.handle.net/20.500.14352/13998
LA eng
NO Unión Europea. FP7
DS Docta Complutense
RD 13 abr 2025