Fig. 5
From: Mantle-derived fluids in the Nankai Trough Kumano forearc basin
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. While helium isotope and radon data would favour channelized fluid flow at several depths drilled during Exp 338 (red and gray solid lines) in addition to pervasive fluid migration through pore space, the 1Â year later Exp 348 bears evidence only for pervasive fluid migration through pore space along mineral grain boundaries with an overall 3He/4He ratio of 2.4Â Ra (dashed curved lines)