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作者对陕西山阳地区中酸性小岩体进行了系统的地质地球化学研究。该区位于东秦岭海西褶皱带,属华北地块南缘。该区广泛分布的中酸性小岩体一般为浅成产物。规模小,出露面积一般在0.0n～0.nkm~2之间,呈岩株产出,往往成群出现。岩石具典型的斑状结构,主要岩石类型为花岗闪长斑岩、二长花岗斑岩和石英闪长(玢)岩。从岩体的产状、岩石的结构和长石类矿物的结构状态来看,小岩体岩石具有次火山岩的特点。根据同位素年龄的测定,岩体的成岩时代属燕山早期。这些小岩体中,矿床(点)、矿化点繁多,构成一个斑岩矿带。
The authors conducted a systematic geo-geochemical study of medium-acidic small rock mass in the Shanyang area, Shaanxi Province. The area is located in the East Qinling Hercynian fold belt, belonging to the southern margin of North China Block. The medium-acidic small rocks widely distributed in this area are generally shallow products. Small size, the exposed area is generally between 0.0n ~ 0.nkm ~ 2, was rock production, often appear in groups. The rocks have typical porphyritic structures, with the main types of rocks being granodiorite porphyry, monzonitic granite porphyry and quartz diorite (玢) rock. From the occurrence of rock mass, the structure of rock and the structural state of feldspar minerals, small rock mass has the characteristics of subvolcanic rocks. According to the determination of isotopic age, the rock diagenetic period belongs to the early Yanshan. Among these small rock masses, the deposits (points) and mineralization points are numerous, forming a porphyry ore belt.