NDLI: Fluid evolution in the Baia Mare epithermal gold/polymetallic district, Inner Carpathians, Romania

Content Provider	Springer Nature Link
Author	Grancea, Luminita Bailly, Laurent Leroy, Jacques Banks, David Marcoux, Eric Milési, Jean Cuney, Michel André, Anne Istvan, Dumitru Fabre, Cécile
Copyright Year	2002
Abstract	The Baia Mare district (Romania) represents a complex segment of the Neogene/Quaternary, subduction-related, volcanic chain of the Carpathians. In this province, the calc-alkaline volcanism and associated mineralization are closely related to a major strike-slip fault and an underlying pluton. The ore deposits of the district have many features typical of low-sulfidation (or adularia-sericite) epithermal deposits. The combination of fluid-inclusion microthermometry, Raman spectroscopy, bulk crush-leach analysis, laser ablation-optical emission spectrometry (LA-OES) of individual fluid inclusions and stable isotope data has been used to characterize the ore-forming solutions involved with gold/polymetallic mineralization in three of the largest deposits. Ore fluids at Baia Sprie, Cavnic and Sasar deposits had temperatures of 320 to 150 °C and salinities in the range 0–21 wt% NaCl equiv. During phreatomagmatic activity, fracturing and periods of vein dilation, the pressure fluctuations may have caused boiling. The hydrothermal fluids were Na–K–Li–Ca chloride solutions with lesser amounts of SO4 and F. The Na/K ratios and the stable isotope compositions are consistent with equilibration of the fluids with country rocks at progressively lower temperatures. The halogen ratios (Br/Cl×103 in the range 0.13–1.21), together with sulfur isotopic systematics (δ34S=0.3–5.2 per mil), are consistent with a dominantly magmatic origin of the solutes, and probably of the ore fluids themselves.
Starting Page	630
Ending Page	647
Page Count	18
File Format	PDF
ISSN	00264598
Journal	Mineralium Deposita
Volume Number	37
Issue Number	6
e-ISSN	14321866
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-04-13
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Geology Mineral Resources Mineralogy
Content Type	Text
Resource Type	Article
Subject	Geophysics Economic Geology Geochemistry and Petrology

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