Dongpo Ore Field, Lead-zinc Deposits Ore-controlling Structures

Dongpo ore field locates at the transitional zone of South China drape series and Yangzi quasi terra platform, and it's a floorboard about a series of ore producing area which distribute around Qianlishan granite rock body and special place of carbonate treeme which is close to Qianlishan granite rock body. Those zinc-lead deposits occur in the inside and outside contact belt of rock body.Based on the predecessors' work, the writer summarizes their experience and discovers some questions. The author do geological investigation very carefully, and glean a great amount of geological information and rock and ore samples. Applying modern petrology,deposit theory,geochemistry,mineralogy,isotope geology and metallogenetic prognosis theory and method, combining other subjects such as processing datum and simulating maps with computer, the author also analyzes the relationship among the ore-forming and stratum,structure,magmatic rock on the base of studies on ore-forming geological background. Applying the views of geomechanics, the author analyzes the evolution and changes of ore district structure in macro and micro sides. Through studying the geological features of ore deposit, the author not only summarizes metallogenetic rule and establishes a new metallogenetic model, but also analyzes varies ore-controlling structures and bring forward a new ore-controlling model.From the systematic studies, the author has get following conclusions: structure is a very important factor of mineralization in this ore district. The relationship between structure and ore-forming can be shown in three faces: first, structure can drive ore elements to activate and to migrate; second, structure can create suitable ore-hosting sites; third, structure can afford routeways for ore elements circulation. Tectonic movement sometimes go with magma activity, and make fluid which include ore elements occur activation and transfer with the tectonic dynamic and magma heat. The folds and faults brought by tectonic movement provide routeways and ore-hosting sites for ore-forming.After drawing plentiful ichnographies and section planes, author discover the distributing rule of lead-zinc orebodies, and forecast ore-searching in deep and margine of lead-zinc deposits in Dongpo ore field.