Abstract:

The concept of “Reworked Metallization” is a new theory proposed by Prof. Tu Guangzhi. This theory has its basic arguments and distinctive characteristics as follows: the extensiveness of metallogenic material; the uniqueness of oreforming fluids; the activity  of the metallogenic elements; the endogenic characteristic of the reworked metallization; the  leading role played by faulting; the diversity of the host rocks; the widespreading of the reworked deposits. Their metallization is unique and has a proper position in the fourfold division of ore deposits. DayaoMouding type of sandstonehosted copper deposits in Central Yunnan are of typical sedimentarydiageneticanadiageneticreworked metallogeneses. Their main arguments are as follows: rifting metallogenesis setting; source bed (K,J) and source rock (Yuanmou paleocontinent); the ore bodies are controlled by stratigraphy, lithofacies and lithology. Their characteristics and their occurrence are closely related to coal series which provides organic matter and salt bed  that in turn provides halogen for the ore. The shape and occurrence of ore bodies, the texture and structure of ores, the behavior  of oreforming fluids and the source of water and the type of organic matter  and its effect  are distinct during different metallogenetic stages. To interpret and determine the limits of reworked metallization in terms  of the concepts of petrogeny, the upper limit (beginning) is set  afteranadiagenesis and the lower limit (ending) is at the end of quasimetamorphism.

Key words: reworked metallization, upper and lower limits, sandstonehosted copper deposits in the central Yunnan, sedimentarydiageneticanadiageneticreworked metallization