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The volcanic rocks in the Suman Khad area in Southwest Mongolia form a bimodal suite consisting mainly of peralkaline rhyolites with subordinate basalts. The rhyolite sample collected from the bimodal suite yielded a SHRIMP zircon U-Pb age of 314±5Ma (MSWD=1.41, n=12), which was interpreted to represent formation time of the bimodal volcanic suite. The basalts were characterized by enrichment in LILE...
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