Figure 5
From: Nitrogen recycling at the Costa Rican subduction zone: The role of incoming plate structure
Plot of helium isotope ratios (3He/4He) versus 20Ne/4He with three components are MORB, crust, and ASW. The Nicoya and Santa Elene forearc springs show the mixing relationship between ASW and the hybrid fluid with 10% MORB contribution. The arc front spring, located near the Rincon de la Vieja volcano (Fig. 1) is like the MORB component. The submarine seep fluids8 are also mixed by two components (ASW and deep fluids with > 10% MORB input).
