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东秦岭斑岩组合形成环境很浅,无同时代火山岩共生,与造山运动没有联系而受断裂控制,其中的酸性岩达80％,且钾大于钠,主要与钼的矿化有关。根据这些特点,结合稳定同位素资料,作者认为结晶出东秦岭斑岩组合的岩浆,是下地壳深部的火成岩,在部分熔融程度很低的条件下形成的流纹岩质岩浆。它是东秦岭地壳演化史晚期才出现的,是我国地壳发展历史上的一个重要事件。
The formation of the East Qinling porphyry assemblage is very shallow and has no symbiosis with volcanic rocks of the same age. It is controlled by faults without contact with orogenic movement. The acid rock reaches 80% and potassium is greater than sodium, which is mainly related to molybdenum mineralization. Based on these characteristics, combined with stable isotopic data, the authors believe that the crystallization of the East Qinling porphyry assemblage magma, is the lower part of the crust igneous rock, formed in part of the low degree of melting conditions rhyolite magma. It appears only in the later evolution of East Qinling crust, and is an important event in the history of crustal development in China.