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北秦岭豫西马驹口地区宽坪岩群中的斜长角闪岩原岩为基性侵入岩（ 辉长岩） ，其全岩的Ｓｍ－Ｎｄ 同位素等时线年龄为７４７－７２±４３Ｍａ，钕同位素初始比值为εＮｄ（ｔ） ＝ － ０．１ ，表明该基性侵入岩形成于晚元古代晚期，岩石来源于亏损的上地幔源区，但岩浆在形成和侵位过程中遭受不同程度的地壳物质成分的混染。
The protolith of amphibolite from the Kuanping group in the Majukou area of the western Qinling Yuxi area is a basic intrusive rock (gabbro). The Sm-Nd isotope isochron age of the whole rock is 747-72 ± 43Ma, The initial ratio of neodymium isotope is εNd (t) = -0.1, indicating that the basic intrusive rocks were formed in late Late Proterozoic and the rocks originated from the depleted upper mantle source. However, magma experienced different degrees of formation and emplacement The crust of the material composition of the contamination.