Abstract

Research : Solid earth sciences

Mantle-derived fluids in the Nankai Trough Kumano forearc basin

Wiersberg T, Hammerschmidt S, Fuchida S, Kopf A, Erzinger J
Keywords:
Helium isotopes, Radon, Fluid Flow, Nankai Trough, Integrated Ocean Drilling Program

Noble gas abundance and isotope data from 12 drilling mud gas samples obtained during IODP Expeditions 338 and 348 provide new insights on fluid origin and fluid migration in the inner accretionary prism below the Kumano forearc basin offshore SE Japan. The samples originate from three adjoining boreholes (C0002F, C0002N and C0002P) spanning depths between 950 and 3050 meters below sea floor (mbsf) and are composed of air and variable contributions of mantle-derived and crustal fluids

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Conceptual model of fluid flow in the accretionary prism of the Kumano forearc basin during Exp 338 (left diagram) and Exp 348 (right diagram), modified from Yamano et al., 1992 and Moore et al., 2015.

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