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秦岭造山带大量发育中生代深成花岗岩基和浅成斑岩体．长期以来，前者被作为改造型或Ｓ型；后者伴随钼矿化，被作为同熔型或Ｉ型．统计表明，浅成斑岩体Ｓｒｉ＝０．７０５－０．７１４， δ１８Ｏ＝７．２％。－１２．１‰，深成花岗岩基 Ｓｒｉ＝ ０．７０５－０．７１０， δ１８Ｏ＝ ６．１‰－１０．４‰，二者基本一致．锶氧同位素组成的一致性指示浅成斑岩与深成花岗岩之物质来源和成岩机制的相似性．通过分析成岩构造背景、岩石矿物学特征、地球化学特征和区域地球物理资料，认为浅成斑岩与深成花岗岩基同属中生代华南与华北古板块碰撞造山的产物，均属碰撞型或陆壳重熔型花岗岩类．
The Qinling orogenic belt extensively developed the Mesozoic deep granite basement and epithermal porphyry. For a long time, the former was regarded as a remodeled or S-type; the latter was accompanied by molybdenum mineralization and was identified as the same type or type I. Statistics show that shallow porphyry Sri = 0.705-0.714, δ18O = 7.2%. -12.1 ‰, deep granite base Sri = 0.705-0.710, δ18O = 6.1 ‰ -10.4 ‰, the two are basically the same. The homogeneity of the strontium-oxygen isotopic composition indicates the similarity of the material sources and diagenetic mechanisms of the epithermal and deep granites. By analyzing diagenetic tectonic setting, rock mineralogical characteristics, geochemical characteristics and regional geophysical data, it is considered that both the epithermal and the deep granite basement belong to the collisional or continental crust Molten granite class.