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藏北巴毛穷宗羌巴欠火山岩K-Ar和⁴⁰Ar-³⁹Ar年代学研究

STUDY OF ⁴⁰Ar-³⁹Ar AND K-Ar DATING ON THE HIGH-K VOLCANIC ROCK FROM BAMAOQIONGZONG TO QIANGBAQIAN IN THE NORTHERN TIBET

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【Author】 LIU Hong-ying~1,XIA Bin~1,DENG Wan-ming~2,ZHANG Yu-quan~1 1.Institute of Geochemistry, Chinese Academy of Sciences,Guangzhou510640,China; 2.Institute of Geology and Geophysics, Chinese Academy of Sciences,Beijing100029,China

【机构】中国科学院广州地球化学研究所；中国科学院地质与地球物理研究所；中国科学院广州地球化学研究所广东广州　510640；广东广州　510640；北京　100029；广东广州　510640；

【摘要】两种方法(K Ar和40Ar/39Ar)测定藏北火山岩同位素地质年龄表明其相当于渐新世到中新世:巴毛穷宗钾质碱性火山岩为32Ma～19Ma,涌波错和羌巴欠为17Ma和14Ma～12Ma等,同位素地质年龄范围在32Ma～12Ma,而且火山喷溢作用,从南到北逐渐变新。其中在巴毛穷宗火山岩区获得32Ma的年龄,证实青藏高原的隆升至少在32Ma以前已经开始。更多还原

【Abstract】 The high-K volcanic rock from Bamaoqiongzong,Qiangbaqian and Yongbocuo in the northern Tibet have been dated with ⁴⁰Ar-³⁹Ar technique and K-Ar dilute technique.The result showed that the age of Bamaoqiongzong is 32 Ma～19 Ma, Yongbocuo is 17 Ma and Qiangbaqian is 14 Ma～12 Ma,ranging from the Oligocene Epoch to the Miocene Epoch, but the time becomes new gradually from south to north. According to the relation between the uplift of the northern plateau and the volcanism, the authors infer that the beginning of the main uplift of the northern plateau occurred at least 32 Ma ago.更多还原