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The Gejiu tin district in western Cathaysia block comprises a series of igneous rocks including equigranular and porphyritic granites, gabbro and nepheline syenite. Systematic SHRIMP or LA-ICP-MS zircon U–Pb analyses of 15 representative samples from various phases of the Gejiu complex yielded Late Cretaceous ages of 78–85Ma. Based on their mineralogical, geochemical and Sr–Nd–Hf isotope characteristics,...
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