“Fluorite deposits at Encantada-Buenavista, Mexico: products of Mississippi Valley type processes” [Ore Geol. Rev. 23 (2003), 107–124]—a reply
2004; Elsevier BV; Volume: 25; Issue: 3-4 Linguagem: Inglês
10.1016/j.oregeorev.2004.04.005
ISSN1872-7360
AutoresJ. Tritlla, Eduardo Gonzáléz-Partida, Gilles Lévresse, David Banks, Jacques Pironon,
Tópico(s)Geochemistry and Geologic Mapping
ResumoThe origins of hydrocarbons occurring in oil-bearing fluid inclusions (FIs) have been studied in detail over the last four decades, but very little is known about co-occurring nitrogen, sulfur and oxygen (NSO)-containing compounds. Here, we outline a new method for gathering valuable information on NSO-compounds using the Fourier Transform-Ion Cyclotron Resonance-Mass Spectrometry (FT-ICR-MS) in combination with Atmospheric Pressure Photoionization in positive ion mode (APPI (+)) and Electrospray Ionization in negative ion mode (ESI (−)). A key element was to develop a rigorous acid-free cleaning protocol to make oil inclusions from a broad range of host materials accessible to the very sensitive FT-ICR-MS technique. Although oil contamination from surrounding organic matter could not be entirely eliminated, the procedure enables distinction of external contaminants and identification of affected NSO-compound classes allowing a conditional interpretation of the FT-results of FI samples, especially for compounds measured in the APPI (+) mode. First insights into the high molecular weight hydrocarbons and NSO-compounds in FI oils are presented here using examples from Germany, Tunisia, Pakistan and Mexico.
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