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精确的锆石SHRIMPU-Pb年龄测定表明,内蒙古苏尼特左旗富钾花岗岩的结晶年龄分别为423Ma±8Ma和424Ma±10Ma。综合区域资料,认为该年龄代表了内蒙古中部志留纪期间发生弧-陆碰撞事件的时限。
Accurate zircon SHRIMPU-Pb dating shows that the crystallization age of the Zn-rich granite in the Sunitezuoqi, Inner Mongolia are 423Ma ± 8Ma and 424Ma ± 10Ma, respectively. Based on the regional data, this age is considered to represent the time limit for the occurrence of an arc-continent collision during the Silurian in central Inner Mongolia.