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法库地区十间房片麻状二长花岗岩过去被认为是大古代或元古代混合岩和混合花岗岩．１：５万地质调查表明，该花岗岩是与印支－海西期韧性剪切构造同期侵位的花岗岩，同位素年龄测试属中三叠世．该岩体属复式岩体，是上部地壳沉积物质局部熔融的花岗岩浆沿剪切带被动侵位的“Ｓ”型大型岩床．
The fabled gneissic monzonitic granites of the Faku area were formerly known as the Paleozoic or Proterozoic and mixed granites. The 1: 50000 geological survey shows that this granite was granite that had been emplaced during the same period as the Indo-Hercynian ductile shear structure, and the isotopic age test belongs to Middle Triassic. The rock mass is a compound rock body and is a “S” type large-sized bedrock in which the granite magma locally melted in the upper crustal deposits is emplaced passively along the shear zone.