Magmatic Signature in Submarine Hydrothermal Fluids Vented Offshore Ventotene and Zannone Islands (Pontine Archipelago, Central Italy)

Figure 8

Geothermometric and geobarometric estimations for the bubbling gases from Zannone and Ventotene (see text and Section 1 of Supplementary Materials for details). B-Z2 and B-VEN were analyzed in this paper; B1, B2, and B3 after Martorelli et al. [27]: (a) temperature vs. oxygen fugacity (expressed as log ) diagram; geothermometric estimations for the submarine hydrothermal systems of the Aeolian Islands are reported for comparison. The solid buffers quartz–fayalite–magnetite (QFM), nickel–nickel oxide (N–NO), and hematite–magnetite (HM) are plotted as reference (after Eugster and Wones [84]). (b) Estimated equilibrium pressure of the hydrothermal reservoirs. The pressure is shown on the vertical axis as (bars). The boiling curves for saturated NaCl and 1%NaCl waters (brines) are shown. by using the estimated equilibrium temperatures.

(a)

(b)