Sulfur isotope geochemistry of the submarine hydrothermal coastal vents of Punta Mita, Mexico
Por:
Alfonso P., Prol-Ledesma R.M., Canet C., Melgarejo J.C., Fallick A.E.
Publicada:
1 ene 2003
Resumen:
Coastal hydrothermal submarine vents occur near Punta Mita (Mexico) through a seafloor fissure hosted by basaltic rocks and partially covered by recent sediments. Hydrothermal venting produces calcareous tufa mounds, with minor sulfides, barite and apatite. Pyrite is the most abundant sulfide mineral that precipitates around the submarine hot springs. It occurs as framboids, euhedral crystals, thin botryoidal coatings interbedded with calcite, and as replacement of detrital magnetite grains. Vent fluids have temperature below 100°C, and methane is abundant. Sulfur isotopic composition of pyrite predominantly has ?34S values from -10.7‰ to +4.9‰ suggesting that the source of sulfur is microbially reduced sulfate seawater. © 2003 Elsevier Science B.V. All rights reserved.
Filiaciones:
Departament de Cristallografia, Mineralogia i Dipòsits Minerals, Universitat de Barcelona, c. Marti i Franques s/n, 08028 Barcelona, Spain
Instituto de Geofisica, Universidad Nacional Autónoma de México, Ciudad Universitaria, Del. Coyoacán 04510 D.F., Mexico
Isotope Geosciences Unit, SUERC, East Kilbride, Glasgow G75 0QF, United Kingdom
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