The talc deposits on the Liaodong Peninsula formed by regional metamorphic–hydrothermal metasomatism of magnesian carbonate rock formations, whose distribution horizons are consistent with those of magnesite ore bodies and belong to Member 3 of the Dashiqiao Formation, Liaohe Group. The country rocks of the ore bodies are mainly magnesite marble and dolomite marble, and the ore bodies are essentially consistent with those of the strata—they occur as lenticular or lens-shaped bodies in the compressional fracture zones of magnesite marble or dolomite marble, generally with lengths of 200–600 m, thicknesses of 0.5–80 m, and maximum extension depths of 500–700 m. The ore types are classified into a pure talc type, a talc-magnesite type, and a talc-dolomite type. The talc ore bodies within the Fanjiapuzi mining district are hosted as lenticular and lensoid bodies within the magnesite marble strata of the 3rd Member of the Dashiqiao Formation. A total of six industrial ore bodies have been identified, among which ore bodies 1–4 constitute the majority. The ore bodies are consistent with the country rocks; nevertheless, their boundaries are ill defined and present a gradational transitional relationship. Furthermore, a silicified zone with a width of 1–2 m is developed peripherally to the talc ore bodies, accompanied by graphitization, clinochloritization, and pyritization.

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