NDLI: Thermobarometry of the Bleikvassli Zn-Pb-(Cu) deposit, Nordland, Norway

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Mineralium Deposita : Volume 33

Mineralium Deposita : Volume 32

Thermobarometry of the Bleikvassli Zn-Pb-(Cu) deposit, Nordland, Norway

Content Provider	Springer Nature Link
Author	Rosenberg, J. L. Spry, P. G. Jacobson, C. E. Cook, N. J. Vokes, F. M.
Copyright Year	1998
Abstract	The Bleikvassli massive sulfide ore deposit is hosted by Proterozoic pelitic, quartzofeldspathic, and amphibolitic rocks of the Uppermost Allochthon of the Scandinavian Caledonides. Staurolite-garnet-biotite and kyanite-staurolite-biotite assemblages indicate that metamorphism reached the kyanite zone of the amphibolite facies. Geothermobarometry was conducted on rocks in and around the deposit using a variety of silicate and sulfide calibrations. Temperature determinations are most reliant on the garnet-biotite exchange reaction, with analyses obtained from 259 garnet rims and adjacent biotite. Results from nine calibrations of the garnet-biotite geothermometer are considered, but compositional limitations of many calibrations involving high Ca and Mn contents in garnet and AlVI and Ti in biotite make many of the coexisting mineral pairs unsuitable. Average temperatures calculated from the two calibrations that most closely address the garnet-biotite compositions observed at Bleikvassli are 584 °C ± 49 °C and 570 °C ± 40 °C. The application of two calibrations of the garnet-staurolite geothermometer on a limited number of samples yields 581 °C ± 2 °C and 589 °C ± 12 °C, assuming a H2O=0.84, based upon calculations of the modal proportions of gaseous species. Pressure determinations are less constrained. Phengite and plagioclase-biotite-garnet-muscovite geobarometers give average pressures of approximately 5.0 kbar and 8.5 ± 1.2 kbar, respectively. Pressures obtained from the sphalerite-hexagonal pyrrhotite-pyrite barometer average 7.7 ± 1.0 kbar. In consideration of these results, the peak metamorphic conditions at the Bleikvassli deposit are estimated to be 580 °C and 8 kbar.
Starting Page	19
Ending Page	34
Page Count	16
File Format	PDF
ISSN	00264598
Journal	Mineralium Deposita
Volume Number	34
Issue Number	1
e-ISSN	14321866
Language	English
Publisher	Springer-Verlag
Publisher Date	1998-11-19
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Geophysics Economic Geology Geochemistry and Petrology

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Mineralogy and textural relationships among sulphosalts and related minerals in the Bleikvassli Zn-Pb-(Cu) deposit, Nordland, Norway

The effects of sulfidation and oxidation during metamorphism on compositionally varied rocks adjacent to the Bleikvassli Zn–Pb–(Cu) deposit, Nordland, Norway

A sulphur isotopic study of the Bleikvassli Zn-Pb-Cu deposit, Nordland, northern Norway

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Thermobarometry of the Bleikvassli Zn-Pb-(Cu) deposit, Nordland, Norway

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