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1.The waters scoured off the soft, windblown soil near the surface and eventually reached bedrock, the hardened lava of the Columbia Plateau.
洪水冲洗掉地表附近松软的风化土，最终到达了岩床，哥伦比亚高原上坚硬的火山岩。收藏指正
2.40Ar-39Ar plateau dating of orthoclase from the syenite yielded an age of 27.14±0.05 Ma, which is slightly older than the age of its surrounding lava.
碱性正长岩体与新生代钾质熔岩密切共生,Ar-Ar法测得正长岩的年龄为27.14Ma±0.05Ma,略早于熔岩。收藏指正
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