Fig. 4: Plot of dissolved CH4 concentrations vs dissolved Mn concentrations for the Aurora hydrothermal plume (solid circles) compared with the like-for-like trend (red line) for the Rainbow hydrothermal plume39. | Nature Communications

Fig. 4: Plot of dissolved CH4 concentrations vs dissolved Mn concentrations for the Aurora hydrothermal plume (solid circles) compared with the like-for-like trend (red line) for the Rainbow hydrothermal plume39.

From: Volcanically hosted venting with indications of ultramafic influence at Aurora hydrothermal field on Gakkel Ridge

Fig. 4

Ranges of CH4:Mn ratios for high temperature (≥300 °C) vent-fluids at sites hosted in mafic rocks on slow and ultra-slow spreading ridges (Snakepit, TAG, Broken Spur and Piccard) are shown in pale orange (data from59,70,71). Corresponding ranges for high temperature (≥300 °C) vents influenced by ultramafic rocks (Rainbow, Logatchev I, Logatchev II, Ashadze I, Ashadze II) are shown in pale blue (data from33,71,72). Also shown, in purple, are the much higher CH4:Mn values for systems influenced by terrigenous continental sediments of the kind reported at Aurora (ref. 40 and reference. therein). The dashed orange line (Lucky Strike Vents73) and dashed blue line (Kairei Vents36) indicate two vent-systems that depart from the general case, each of which is discussed in detail in the text.

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