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Fluid-inclusion microthermometry and the Zr-in-rutile thermometer for hydrothermal rutile

Artikel i vetenskaplig tidskrift
Författare A. R. Cabral
F. J. Rios
L. A. R. de Oliveira
F. R. de Abreu
B. Lehmann
Thomas Zack
F. Laufek
Publicerad i International Journal of Earth Sciences
Volym 104
Nummer/häfte 2
Sidor 513-519
ISSN 1437-3254
Publiceringsår 2015
Publicerad vid Institutionen för geovetenskaper
Sidor 513-519
Språk en
Länkar dx.doi.org/10.1007/s00531-014-1120-...
Ämnesord Hydrothermal rutile, Fluid-inclusion microthermometry, Zr-in-rutile thermometer, Mil Oitavas gold, SAO-FRANCISCO CRATON, MINAS-GERAIS, SOUTHERN SERRA, BRAZIL, PROVENANCE, ESPINHACO, ZIRCON, GEOCHEMISTRY, EXAMPLE, BELT
Ämneskategorier Geokemi

Sammanfattning

The Zr-in-rutile thermometer is well established for the determination of metamorphic temperatures, particularly in high-grade metamorphic terrains, and for sedimentary provenance studies. The robustness of the rutile thermometry has not been tested on hydrothermal systems. Unlike quartz, a common hydrothermal mineral with abundant fluid inclusions, it is difficult to find fluid inclusions in rutile that are suitable for fluid-inclusion microthermometry. Here, we report fluid-inclusion microthermometric measurements in rutile from the auriferous quartz-kaolinite-hematite vein that typifies the gold deposit of Mil Oitavas in the southern Serra do Espinha double dagger o, Minas Gerais, Brazil. Primary fluid inclusions in the rutile record moderately saline (10-12 wt% NaCl equivalent), aqueous-carbonic fluids with a total homogenization temperature of similar to 250 A degrees C, which were likely trapped at about 300 A degrees C and 2.0 kbar. This temperature is approximately 200 A degrees C lower than that predicted by the Zr-in-rutile thermometer. For hydrothermal conditions of relatively low temperature, direct measurements of homogenization temperatures in rutile-hosted fluid inclusions should be preferred to the Zr-in-rutile thermometer.

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