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对我国七个碱性岩体用一种或两种方法进行了年龄测定。Rb-Sr法测定了岩石及微斜长石;(40)Ar-(39)Ar法测定了闪石、辉石、正长石及微斜长石;超基性碱性岩用Sm-Nd等时线法测定。各岩体年龄分别为:坪河462Ma,赛马244Ma,柏林川218Ma,紫金山153Ma,龙王庙150Ma,丫髻山127.5Ma,永胜31.7Ma。I(sr)为0.7044-0.7083。已获得的Sr、Nd同位素数据表明,碱性岩浆属幔源,或来自地幔,有地壳物质加入。
Seven alkaline rocks in our country by one or two methods of age determination. Rb-Sr method for the determination of rocks and micro plagioclase feldspar; (40) Ar- (39) Ar method for the determination of amphibole, pyroxene, orthoclase and micro plagioclase feldspar; ultrabasic rock with Sm-Nd Isochord method. The rock age are: Ping River 462Ma, race horse 244Ma, berlin River 218Ma, Purple Mountain 153Ma, Dragon King Temple 150Ma, Yaji Mount 127.5Ma, Yongsheng 31.7Ma. I (sr) is 0.7044-0.7083. The available Sr and Nd isotopic data show that alkaline magma is either derived from the mantle source or from the mantle and crustal matter is added.