How mafic was the Archean upper continental crust? Insights from Cu and Ag in ancient glacial diamictites
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DOI: 10.1016/j.gca.2019.08.002
Abstract: Abstract The concentrations of Cu and Ag, both insoluble chalcophile elements, can be used to place tight constraints on the proportion of basalts in the upper continental crust (UCC) through time via analyses of fine-grained… read more here.
Keywords: continental crust; crust; upper continental; glacial diamictites ... See more keywords
Mafic Archean continental crust prohibited exhumation of orogenic UHP eclogite
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DOI: 10.21203/rs.3.rs-127916/v1
Abstract: The absence of ultrahigh pressure (UHP) orogenic eclogite in the geological record older than c. 0.6 Ga is problematic for evidence of subduction having begun on Earth during the Archean (4.0–2.5 Ga). Many eclogites in… read more here.
Keywords: continental crust; crust; archean continental; crust prohibited ... See more keywords