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The stable isotopes of copper (Cu) and zinc (Zn) are finding increasing applications in surface Earth geochemistry. An important early observation is that aqueous pools of Cu (rivers and oceans) are isotopically heavier than rocks of the continental crust. For Zn, the global average δ66Zn for rivers is identical to estimates of the upper continental crust, but the oceans are slightly heavier. Here,...
High grade orthogneiss, amphibolitic dykes and paraschist to migmatites were studied in the Red Sea Lowlands of eastern Eritrea. Chemical data and a mineral assemblage of kyanite, staurolite, almandine garnet, biotite and quartz indicate that the schists were formed by metamorphism of pelitic metasediments derived by subaerial weathering, deposited in a marine environment. Thermobarometry based on...
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