Main building granite of São Tiago de Folhadela Parish Church (North of Portugal). Petrography, glyptography, construction phases and decay by pyrite oxidation

David M. Freire-Lista*, Bruno B. Campos, Maria do Rosário Costa, Jorge Sanjurjo-Sánchez

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

A glyptographic analysis of São Tiago de Folhadela Church (Portugal) has been carried out, which comprised petrologic, mason's marks and walls stratigraphy studies. The construction phases of the church were determined. Petrographic thin sections, XRD, XRF and SEM were used for the determination of the origin of the main building granite spots. The speckles were produced by creation of secondary phases such as goethite and other iron oxides-hydroxides and clay minerals. Its brown spots are produced by oxidation of pyrite to goethite and by release, migration and iron retention by sericite.
Original languageEnglish
Article number128904
JournalConstruction and Building Materials
Volume350
DOIs
Publication statusPublished - 3 Oct 2022

Keywords

  • Mason's marks
  • Petrography
  • Pyrite oxidation
  • Romanesque
  • Spot granite

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