The 40Ar/39Ar ages of 10 magmatic and hydrothermal micas from the Grasberg Igneous Complex range from 3.33 ± 0.12 to 3.01 ± 0.06 Ma. The ages of intrusive rocks and the paragenetic relationships between intrusive rocks and hydrothermal alteration and mineralization indicate that the Grasberg Igneous...
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