Microthermometry of fluid inclusions in calcite from Fuerteventura carbonatites: composition and formation conditions

  1. Gabriele Carnevale 1
  2. Vittorio Zanon 2
  3. Ramón Casillas Ruiz 3
  4. Agustina Ahijado Quintillán 3
  1. 1 Dipartimento di Scienze della Terra e del Mare, Università degli Studi di Palermo
  2. 2 Instituto de Investigação em Vulcanologia e Avaliação de Riscos (IVAR), Universidade dos Açores, Ponta Delgada, Portugal
  3. 3 Departamento de Biología Animal, Edafología y Geología. Facultad de Ciencias. Universidad de La Laguna. (Santa Cruz de Tenerife)
Erakutsi afiliazioak +
Aldizkaria:
Geogaceta

ISSN: 0213-683X

Argitalpen urtea: 2022

Zenbakia: 72

Orrialdeak: 31-34

Mota: Artikulua

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Beste argitalpen batzuk: Geogaceta

Laburpena

The petrographic analysis in calcite minerals in carbonatitic dykes from Fuerteventura Basal Complex (Ajuy, Punta de la Nao) shows the presence of isolated primary fluid inclusions, corroborating their magmatic origin instead of a late-stage origin. Micro-thermometric studies in calcite show a restricted range of apparent eutectic temperature (Te*= -21.7 – -21.0 °C) and final ice melting temperatures (Tim= -3.2 – -2.1. °C). Homogenization temperatures and pressures are in the range of 140-210 °C and 4-16 bars respectively. Our results suggest the binary NaCl-H2 O system as a characterizing chemical system in studied fluid inclusions, with the presence of low salinity fluids (≈ 5 wt. % NaCleq), probably related with fluid/ rock interactions.

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