fig04.htm

Figure 4. A relationship between of isotope compositions a concentrations of helium in the gas phases of the fluids. The predominant component of the gas phase is shown using a special symbol (see the legend in the figure). Where direct data were not available, the gases of the hydrocarbon pools of the Siberian Craton were ranked as methanic, and the waters of the West Baikal region, and nitric. The figure shows the fields characterizing the compared parameters in the ancient continental crust ("CRUST") and in the basalts of mid-oceanic ridges ("MORB") and the lines of the mixing of the gases from these reservoirs (inclined shaded band). The gently dipping black line crossing this band shows the statistically true relationship trend between the parameters compared in the combined data sample characterizing the Baikal Rift Zone and its eastern flank (|r| = 0.376 > 0.26 = r0.05sign for n = 57). The exclusion of the data for the eastern part of the Tunka Basin and for the Mergitaika Spring (extreme left point in the plot) yielded |r| = 0.648 gg 0.29 = r0.05sign for n = 46. The total data set (n = 101) also showed significant correlation (|r| = 0.476 gg 0.196 = r0.05sign). The horizontal arrows in the upper part of the plot characterize variations in He concentration under the effect of intracrustal processes (see the text for the explanation).


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