“…H 2 S, COS, SO 2 , CO, H 2 , NH 3 and O 2 have also been detected in appreciable amounts in some fluids (Bény et al, 1982;Ferrando et al, 2010;Frezzotti et al, 2002;Giuliani et al, 2003;Grishina et al, 1992;Peretti et al, 1992;Siemann and Ellendorff, 2001;Tsunogae and Dubessy, 2009). Identification of hydrocarbons heavier than CH 4 is also possible (e.g., Guilhaumou, 1982;Hrstka et al 2011;Makhoukhi et al, 2003;Munz, 2001;Orange et al, 1996;Pironon, 1993;Pironon and Barrès, 1990;Potter et al, 2004;Rossetti and Tecce, 2008;Schubert et al, 2007;Wesełucha-Birczyńska et al, 2010), although fluorescence often does not allow conventional analysis (see e.g., Pironon et al, 1998).…”