The SÃo Pedro do Sul Granite (Central Portugal): An HHP Th-rich Rock of the Hesperian Massif

L. J.P.F. Neves*, W. E. Stephens, A. J.S.C. Pereira, M. M. Godinho, A. E. Fallick

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A high heat producing granite pluton has been investigated with the aims of quantifying the budget of heat producing elements and understanding its petrogenesis. The granite produces three times more heat than typical two-mica granites of this region (about 11.2 μWm-3), due mainly to very high Th (average 120 ppm). The pluton has a high abundance of accessory phases and we model about 51 % of the Th to reside in monazite. the remainder probably present largely in thorite. Fission track methods indicate that U is also concentrated in accessory phases, and at least one major phase (probably K-feldspar). Actinide enrichment correlates well with enrichment in the REE and Zr, and we attribute this to the accumulation of accessory mineral phases, although the mechanism is not clear. Combined whole rock major oxide, trace element and oxygen isotope data for the São Pedro do Sul granite (central Portugal) indicate derivation of the parental magma from a metasedimentary source.

Original languageEnglish
JournalAnais da Academia Brasileira de Ciencias
Issue number1
Publication statusPublished - 1999


  • Hhp granite
  • Th-rich, portugal


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