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内蒙古克什克腾旗同兴乡大乃林沟角闪石岩呈脉状产于侏罗纪中酸性火山岩中,具明显的隐爆特征,晶洞构造发育。主要矿物成分为富铁普通角闪石,含量一般>90％。全岩SiO_2含量为38.65％～41.24％,TFeO为19.00％～32.94％,K_2O+Na_2O为2.72％～3.38％,属富铁、富碱超基性岩类。该类岩石具有富含稀土和大离子亲石元素及(~(87)Sr/~(86)Sr)_i值较高的特征,与典型幔源岩石有所不同。
The Inner Mongolia Keshiketengqi Tongxing Township Daxinlingou amphibole was vein-shaped Jurassic intermediate-acid volcanic rocks, with obvious cryptoexplosion characteristics, crystal cave structure development. The main mineral composition of iron-rich ordinary amphibole, the content is generally> 90%. The content of SiO_2 in whole rock is 38.65% -41.24%, TFeO is 19.00% -32.94%, and K_2O + Na_2O is 2.72% -3.88%. It belongs to iron-rich and alkali-rich ultrabasic rocks. These rocks are characterized by rich REE and lithophile elements and high (87 Sr / 86 Sr) _i values, which are different from the typical mantle rocks.