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The unique eruptions of ultrapotassic volcanic rocks in eastern China reported so far took place in the Xiaogulihe area of western Heilongjiang Province, NE China. These ultrapotassic rocks are characterized by extremely high K 2 O contents (>7wt.%), abnormally unradiogenic Pb isotopic compositions ( 206 Pb/ 204 Pb=16.44–16.55; 207 Pb/ 204 Pb=15.39–15.46;...
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