Contact metamorphism associated to the Penamacor–Monsanto granitic intrusion, Central Portugalgeochemical, isotopic and mineralogical features

  1. Isabel Ribeiro 1
  2. Isabel Margarida H. R. Antunes
  3. Cyntia Mourão 1
  4. Clemente Recio Hernández 2
  5. Fernanda Guimarães
  6. João Farinha Ramos
  7. Fernando J. A. S. Barriga 1
  1. 1 Universidade de Lisboa

    Universidade de Lisboa

    Lisboa, Portugal


  2. 2 Universidad de Salamanca

    Universidad de Salamanca

    Salamanca, España


Journal of iberian geology: an international publication of earth sciences

ISSN: 1886-7995 1698-6180

Year of publication: 2018

Volume: 44

Issue: 2

Pages: 335-353

Type: Article

DOI: 10.1007/S41513-018-0050-X DIALNET GOOGLE SCHOLAR

More publications in: Journal of iberian geology: an international publication of earth sciences


Cited by

  • Scopus Cited by: 2 (07-11-2023)
  • Web of Science Cited by: 2 (22-10-2023)
  • Dimensions Cited by: 2 (09-04-2023)
  • :

JCR (Journal Impact Factor)

  • Year 2018
  • Journal Impact Factor: 0.929
  • Journal Impact Factor without self cites: 0.875
  • Article influence score: 0.346
  • Best Quartile: Q3
  • Area: GEOLOGY Quartile: Q3 Rank in area: 28/47 (Ranking edition: SCIE)

SCImago Journal Rank

  • Year 2018
  • SJR Journal Impact: 0.423
  • Best Quartile: Q2
  • Area: Stratigraphy Quartile: Q2 Rank in area: 21/48
  • Area: Geology Quartile: Q3 Rank in area: 121/303

Scopus CiteScore

  • Year 2018
  • CiteScore of the Journal : 2.2
  • Area: Geology Percentile: 57
  • Area: Stratigraphy Percentile: 52

Journal Citation Indicator (JCI)

  • Year 2018
  • Journal Citation Indicator (JCI): 0.52
  • Best Quartile: Q2
  • Area: GEOLOGY Quartile: Q2 Rank in area: 28/57


(Data updated as of 09-04-2023)
  • Total citations: 2
  • Recent citations: 1
  • Field Citation Ratio (FCR): 0.36


Contact metamorphism related to Variscan and late-Variscan granitic plutons in the Iberian Peninsula is superimposed on medium-grade regional metamorphism, making it often difcult to evaluate per se the thermal efects due to those intrusions and explaining the paucity of scientifc literature on the subject. An exhaustive set of geochemical, isotopic and mineralogical data on the contact-zone metasediments hosting the Penamacor–Monsanto granite (Central Iberian Zone, Portugal) provides a signifcant contribution to the characterization of low- to intermediate-grade contact metamorphism in geological contexts formerly afected by regional metamorphism. The metasediments hosting the Penamacor–Monsanto pluton belong to the extensive detrital sequence of the ante-Ordovician Schist-Greywacke Complex. Bulk geochemistry, oxygen isotope data and crystal-chemistry of key minerals from those contact-zone and neighbouring metasediments have made it possible to infer metamorphic conditions on the contact zone of this granitic intrusion, and to distinguish them from late boron-metasomatism at the exocontact. Mineral parageneses (muscovite + biotite + chlorite ± quartz ± plagioclase ± cordierite, in spotted-schists; biotite + chlorite ± quartz ± plagioclase (± cordierite), in hornfelses) and the composition of these coexisting mineral phases indicate that most of the contact rocks reached the biotite zone (or even the cordierite zone, in some cases), equivalent to upper greenschist – lower amphibolite metamorphic grade. The relatively narrow range of O-isotope temperatures estimated for the crystallization of the marginal granites (550–625 °C) explains the absence of signifcant efects of thermal fow anisotropy on the contact-zone rocks. Besides, textural, paragenetic, mineralogical, isotopic and geochemical nuances observed in hornfelses and spotted-schists seem mainly related to the local host-rock heterogeneities, rather than to thermal efects. The relatively low temperatures estimated for granitoid emplacement and their restricted isotopic and mineralogical impacts on the metasedimentary host-rocks account for the narrow metamorphic aureole associated with the Penamacor–Monsanto pluton, and suggest this massif may correspond to the outcropping tip of a larger granitic intrusion at depth.

Funding information