摘要
///Based on 1∶50 000 regional geological mapping on the southern margin of the East Kunlun Mountains and using methods of detailed field section measurement and petrologic analysis as well as LA-ICP-MS zircon U-Pb dating and geochemical investigation, the authors studied the intermediate-acid magmatic rocks in Bairiqiete area of the Buqingshan tectonic melange belt. The results show that the rocks are mainly granodiorite with 206Pb/238U average weighted age of (441±6) Ma (MSWD=0.75) and intermediate-acid volcanic rock such as rhyolite-porphyry with 206Pb/238U average weighted age of (438±3) Ma (MSWD=2.0). Geochemically, the former is characterized by high content of Si, Al and Na and should belong to the Na-enriched calc-alkali series, whereas the latter is of Si-saturated, aluminous and calc-alkali series.