--> --> Figure 6. Carbon isotope values of calcite from vein margin to vein center for two veins developed in dilational jogs at the Chuctanuda Creek locality.

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Figure 6. Carbon isotope values of calcite from vein margin to vein center for two veins developed in dilational jogs at the Chuctanuda Creek locality. Note that the latest calcite (vein centers) has the most positive carbon values, indicating microbial or themogenic degradation of petroleum hydrocarbon to produce dissolved carbonate at the latest stage of vein development.