A Tentative Discussion on the Principle and Method for Division of Metallogenic Units
The authors suggest a principal framework and steps to divide metallogenic units on the tectonic basis. Metallogenic units in cratonic areas are divided into metallogenic provinces of basement stage, cover stage and post-cratonic stage. Metallogenic units in orogenic areas are divided into metallogenic provinces of early stage, late stage and post-orogenic stage. Metallogenic units of mineralizations related to mafic and ultramafic rocks are delineated according to the fractures, rifts or ophiolite zones concerned. Boundaries of metallogenic units developed in late stages of craton or orogen, especially in post-cratonic or post-orogenic stages, may be discordant with or even traverse tectonic boundaries. The authors have primarily delineated some metallogenic units in consideration of the circumstance of