Rock magnetic susceptibility of ODP Leg 204 sites, supplement to: Larrasoaña, Juan C; Roberts, Andrew P; Musgrave, Robert J; Gràcia, Eulàlia; Piñero, Elena; Vega, Marta; Martinez-Ruiz, Francisca C (2007): Diagenetic formation of greigite and pyrrhotite in gas hydrate marine sedimentary systems. Earth and Planetary Science Letters, 261(3-4), 350-366

Juan C Larrasoaña, Andrew P Roberts, Robert J Musgrave, Eulàlia Gràcia, Elena Piñero, Marta Vega & Francisca C Martinez-Ruiz
Mineral magnetic results and electron microscope observations from gas hydrate-bearing marine sediments cored at southern Hydrate Ridge during Ocean Drilling Program Leg 204 (Sites 1244 to 1252, Cascadia Margin, offshore Oregon) demonstrate that authigenic greigite and pyrrhotite formed as a byproduct of microbially-mediated diagenetic reactions in the sulphate, the anaerobic oxidation of methane (AOM), and the methanic/gas hydrate zones. Geochemical conditions favourable for formation and preservation of greigite and pyrrhotite appear to be a limited...
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