117 / 2016-12-08 12:16:37

Study on the Lithogeochemistry of Jinba Gold Deposit in Habahe County, Xinjiang

12039,12040,12041,4941

Jinba gold deposit is located in the inner contact zone of the Habahe rock body， occurred in plagiogranite of Habahe rock mass and in the Middle Devonian the ASHELE group subgroup second lithologic section second lithologic layer. The ore bodies occur in the nuclear part of the ductile shear deformation metamorphic belt in the Markuli giant fault belt, closely related to early ductile shear activity. This paper discusses the characteristics of wall rock alteration zone, which generally-developed pyrite, sericite, silicification is an important sign of prospecting. Gold mineralization in the area is closely related to plagioclase granite and diorite, the drilling rock samples from the center to the outside mineralization and alteration gradually weakened, change significantly. The unaltered (or weakly altered) gabbro diorite sample have low SiO2, K2O, MgO content higher than altered gabbro-diorite. The trace elements of the altered gabbro-diorite are overall high, Diorite sample REE curve moderate, light and heavy rare earth fractionation is not obvious. Little change in major and trace elements of altered and unaltered plagioclase granite. Light rare earth elements plagioclase granite sample relative enrichment which the right-wing type distribution patterns. Through the LA-ICP-MS zircon U-Pb dating experiment on plagiogranite in Jinba gold deposit, a weighted average age of 431 ± 3.4 Ma was obtained which may represent the early rock mass because the data are significantly older.