Composition of volatiles of sulfide deposits and carbonate structures in submarine hydrothermal fields of the Mid-Atlantic Ridge

Impact of Solid Hydrocarbon on the Composition of Fluid Phase at the Subduction (Experimental Simulation)

“…Volatiles from the samples were analysed using the pyrolysis-free coupled gas chromatography-mass spectrometry (GC-MS) method on a Focus GC/DSQ II Series Single Quadrupole MS analyser (Termo Scientifc, Austin, TX, USA) at the V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk [32,[46][47][48][49]. The gas mixture was released from the fluid and melt inclusions of the samples by means of shock mechanical crushing in a custom-designed crusher.…”

“…Thus, such compounds as alkanes, alkenes, arenes, phenols, aldehydes, carboxylic acids, esters, ketones, nitriles, PAH (polycyclic aromatic hydrocarbon), and their halogenated, methylated, and sulfonated derivatives were found in volcanic gases from Vulcano (Aeolian Islands, Italy), as well as various heterocyclic compounds including thiophenes and furans [26]. Hydrocarbon compounds, including high-molecular ones, and their oxygenated, nitrogenated, sulfonated, and halogenated derivatives were diagnosed by GC-MS in fluid inclusions in natural diamonds [27][28][29][30], in melt and fluid inclusions in phenocrysts from basalts and rhyolites from Men'shii Brat Volcano (Medvezh'ya caldera, Iturup Island) [31], and fluid inclusions in minerals from polymetallic sulfide deposits at Ashadze-1, Semenov-2, Krasnov, and Rainbow, and from the Lost City carbonate structures of hydrothermal fields in the Mid-Atlantic Ridge [32]. Stability of high molecular weight carbon compounds is also proved experimentally at high P-T parameters (at 5.3 Gpa and 1300 • C in the Fe-C-S system) [33].…”