摘要
沈阳市东南部滑石台山附近太古代花岗岩基底中零星分布的超镁铁质岩地质体，经同位素测年，Ｒｂ／Ｓｒ表面年龄４３７０Ｍａ，全岩Ｒｂ／Ｓｒ等时线年龄４６９２±１８４Ｍａ，全岩Ｐｂ／Ｐｂ等时线年龄４５３５±￣（１０８）＿（１１７）Ｍａ。因此，作者认为滑石台山、馒首山、金顶山等地的超镁铁质岩是陨落成因，陨落地质作用发生在１８─１９亿年前。
The paper considered that the geological bodies of ultramafic rocks scattered in theArchean granite basement around Huashitai, Manshou and Jinding Mountains in the south-easten suburbs of Shenyang originated from meteorite fall 1. 8-1.9Ga ago , through the iso-topic age determination which Rb/Sr surface age is 4 370Ma ,whole-rock Rb/Sr isocron age is4536±184Ma,whole-rock Pb/Pb isochron age is 4 536±￣(49)_(34)Ma.
