El yacimiento de W-Sn-(Mo) de Peña do Seo, NW de Españaestudio de inclusiones fluidas

  1. P. Caldevilla 1
  2. F. Gómez-Fernández 1
  3. A.M. Castañón-García 1
  4. T. Martín-Crespo 2
  5. E. Vindel 3
  6. L. González-Menéndez 4
  7. M. Rodrigues 5
  8. A. Guedes 5
  1. 1 Universidad de León
    info

    Universidad de León

    León, España

    ROR https://ror.org/02tzt0b78

  2. 2 Universidad Rey Juan Carlos
    info

    Universidad Rey Juan Carlos

    Madrid, España

    ROR https://ror.org/01v5cv687

  3. 3 Universidad Complutense de Madrid
    info

    Universidad Complutense de Madrid

    Madrid, España

    ROR 02p0gd045

  4. 4 Instituto Geológico y Minero de España
    info

    Instituto Geológico y Minero de España

    Madrid, España

    ROR https://ror.org/04cadha73

  5. 5 Universidade Do Porto
    info

    Universidade Do Porto

    Oporto, Portugal

    ROR https://ror.org/043pwc612

Show affiliations +
Journal:
Geotemas (Madrid)

ISSN: 1576-5172

Year of publication: 2021

Issue Title: X Congreso Geológico de España

Issue: 18

Pages: 356

Type: Article

DIALNET GOOGLE SCHOLAR lock_openOpen access editor

More publications in: Geotemas (Madrid)

Abstract

Peña do Seo is a granite-related W-Sn- (Mo) vein-type deposit in the West Asturian-Leonese zone, part of the Variscan Mas- sif. Total metal reserves were 1.35 Mt, with average grades of 0.25 % WO3 and 0.05% SnO2. Mineralization is found within quartz veins hosted by Precambrian schists from Villalba Formation. Ores might be related to small tardi-tectonic granitic stocks, whose intrusion produced thermal aureoles. Fluid inclusion and micro-Raman studies performed in the quartz asso- ciated with the mineralized veins reveal the presence of three different types of fluids: – I. (H2O-NaCl): T h from 280 ºC to 400 ºC, and salinities between 7 and 16 wt% eq. NaCl. – II. (H2O-CO 2-CH 4-N 2-NaCl) Th from 260 ºC to 326 ºC, salinities between 2 and 5 wt% eq. NaCl and a volatile phase com- position of: CO2: 87-100%, CH 4 : 0-3.8 %, and N2: 0-8.9%. – III. (H2O-CO 2): Homogenization temperatures from 180 ºC to 305 ºC, salinities between 1.6 and 5 wt% eq. NaCl and a volatile phase with CO2. An imiscibility phenomena during a continuous decrease in temperature and salinity are suggested for the fluids associated with this W-Sn- (Mo) vein-type deposit.

Data source: Dialnet