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秦岭杂岩中发育的花岗质片麻岩体是目前秦岭造山带核部所识别的最古老的花岗质深成岩体。选取６组粒径晶形好、无磁性锆石进行ＵＰｂ同位素年龄测定，结果是（９５９±３．６）Ｍａ。这一成果对进一步认识该区晋宁期岩浆活动、构造背景及区域变形时代等具有一定意义。
The granitic gneiss body developed in Qinling Complex is the oldest granitic pluton identified by the core of Qinling orogenic belt. U-Pb isotopic dating of six groups of fine grain size and non-magnetic zircons was selected and the result was (959 ± 3.6) Ma. This result is of great significance to further understanding the magmatic activity, tectonic setting and era of regional deformation in Jinning Period in this area.