Petrogenesis, Fluid Inclusions And Metallogenesis Of Anqing Cu-polymetallic Deposit, Anhui Province

Anqing copper polymetallic ore deposit is located in the northern Taiwan depression of the lower Yangtze plot along with the broken plait middle on mountain mineral field in mengshan mountain in quality and surrounding rock mass on the contact with inner, the middle and lower Yangtze copper iron is an important part of the metallogenic belt. This paper from the regional geological background, ore deposit geology characteristics, rock characteristics, characteristics of fluid inclusions, anqing copper polymetallic ore deposit to the anatomy, discusses the ore-controlling factors of the ore and rock mass causes and the genesis. The research result of the thesis and innovation mainly have the following:1、This area total alkali content of rock mass (K20+Na2O) average is7.71%, China than normal high content of mengshan rock; Na2O/K2O average was1.62; Goodman (a) in the index is3.03-3.86, the average of3.42, belongs to the calcium alkaline-calcium alkali sex rock. Month of the rock mass mountain CaO average content is5.45%, K2O average content is2.73%, and the characteristics of rocks of ACG agree, this means magma mainly comes from deep in the mantle.2、On the analysis of the characteristics of rock, rock in the study of chemical characteristics of rock mass, the geochemical characteristics and isotope geochemical characteristics, and on the basis of magma source, diagenetic environment from and magma evolution, and discussed the causes of the rock mass in the mineralization, think this is deep rock by alkaline basaltic magma in the evolution of the gradually occurring during the crystallization differentiation and the earth’s crust and silicon aluminium calcium rock assimilation of the formation of the dyeing mix.3、According to the structure of mineral structure and mineral magmatite and minerals into relationship between, anqing copper of polymetallic mineralization is divided into two phase six stages.4、The region’s main mineral inclusions in the uniform temperature of200～500℃concentrated in between, can be divided into two group of high temperature in mild, fluid from10.1to42.3%salinity NaCl equiv between, ore-forming fluid combination type of Na+, Ca2+, K+, Mg, Cl (type SO42-), combining previous of hydrogen and oxygen isotope material that the ore-forming fluid from magma water, mineralization in precipitation participation.5、According to the regional geological background, Combined with strata in this area, structure, magmatic rocks and minerals combination, ore type, ore fabrics, ore body, ore body form, wall-rock alteration, the source of ore-forming materials, ore-controlling factors, and mineralization comprehensive features, think anqing copper polymetallic ore deposit account with a contact for the role of the formation of the mainly skarn type Cu polymetallic ore deposit.