Geochronology of and Nd—Sr—Pb Isotopic Evidence for Mantle Source in the Ancient Subduction Zone ben

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The available petrochemical data indicate that volcanic rocks in the Sanshui basin of Guangdong Prov-ince are characteristic of the island-arc tholeiite-calc-alkaline series.Their K-Ar ages range from 43 to 64 Ma,corresponding to Early Tertiary.The Nd-Sr-
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