On the basis of regional strata, magmatic activity, ring and radial faults, gently dipping detachments, geophysical information and isotopic age, this paper discusses the characteristics of mantlebranch structure in western Shandong. According to the characteristics of ore-control structures, gold deposits in the Luxi mantlebranch structure are divided into ductile shear zone type and detachment-slip layer type deposits. The detachment-slip layers type deposit, including the Guilaizhuang gold deposit and Mofanggou gold deposit are significant economic types. The_δ
S values of pyrite associated with gold mineralization exhibit a narrow range of-0.71 to 2.99%., implying that the sulfur was probably derived from the mantle or magma, whereas the_´
and_´D values suggest that the ore-forming fluids of the gold deposits mixed with meteoric water in the shallow level.