Figure 1
From: Marine Carbonates in the Mantle Source of Oceanic Basalts: Pb Isotopic Constraints
206Pb/204Pb versus A. 207Pb/204Pb and B. 208Pb/204Pb for Archaean limestones. Bulk stromatolitic limestones (solid symbols) are connected by tie lines to their respective carbonate fractions (open symbols). Analytical errors are smaller than the symbols used. Shown for reference are the carbonate fractions of other Archaean limestones (see text for sources of data), oceanic basalts (gray field), FOZO (dash area inside gray field), and HIMU end-component (dark gray field). The 2.82 Ga isochron in A. is the regression line for the extremely radiogenic (206Pb/204Pb = 30.2 to 104.4; 207Pb/204Pb = 19.4 to 34.1; 208Pb/204Pb = 42.514 to 74.402) Mushandike stromatolites24 (not shown).
