Study On Mineral Characteristics Of Kalatongke Cu-Ni Sulfide Deposits, Xinjiang

The Kalatongke Ni-Cu sulfide deposit, is located in the Kalatongke metallogenic zone, contaning 33 Mt sufide ore with a grade of 0.8 wt.% Ni and 1.3wt.% Cu. The metallogenic zone develops a series of Cu, Ni, Au metallic ore deposits, associated with its complex structures, frequent magmatic activities and have abundant resources. The Kalatongke Ni-Cu sulfide deposit is charactered by its small intrusions and concentrative industrial ore bodies with high ore grade, so the study on this deposit has a very important practical significance.This paper focuses on rock-forming minerals and ore minerals of the Kalatongke sulfide deposit. The mineral characters, the mineral arisen sequences and the relation of mineral intergrowth are studied by mineralogy, chalcography, chymic analysis and EPMA, etc.On the basic study chemical composition of the minerals, forming conditions, the paper analyses the succession of minerals formed, subdivides different generations and have a discussion on the process of magma evolution and genesis of the deposit.The following are the main results:1. The main rock-forming minerals of Kalatongke Ni-Cu sulfide deposit are chrysolite, broncite,hypersthene, augite, diopside, endiopside, plagioclase and amphibole, the main ore minerals include pyrrhotites, pentlandite, chalcopyrite and pyrite.2. By a great number of investigations on mineral relationshiops and geothermometer, we obtain the development sequences of minerals is olivine→orthopyroxene (clinopyxene)→plagioclase→amphibole→biotite3. Based on research of PGE microscopic characteristics, regularity distribution, we draw a conclusion that PGE is closely related to sufide.4.Evidences from olivine, clinopyxene,and amphibole implicat that kalatongke parental magama is hydrous basaltic magma with high magnesium content,and experienced fractional crystallization in deep.5. The key to form a Ni-Cu sulfide deposit is the sufilde saturation in magama, the main reason for kalatongke sulfide saturation is primitive magma experienced fractional crystallization of olivine and chromite.