西北地质2017，Vol.50Issue(2)：106-114,9.
内蒙古查干德尔斯钼矿成矿流体地球化学特征及矿床成因
Geochemistry of Ore-Forming Fluids and Genesis of Chagandells Molybdenum Deposit in Inner Mongolia
摘要
Abstract
In recent years, the Chagandells molybdenum deposit is the the most important outcome of prospecting molybdenum deposit in the central and western part of Inner Mongolia.The study on fluid inclusions of this deposit has been carried out in this paper.The results show that, the gas-liquid two-phase inclusions of H2O-NaCl-CO2 system were developed within the molybdenite-quartz-sericite veinlets in the main mineralization stage, with a small number of daughter mineral-phase inclusions;and the gas-liquid two-phase inclusions of H2O-CO2 system were occurred within the molybdenite-quartz veinlets during the late mineralization stage, with little gas-phase inclusions.The test results show that the main mineralization stage belongs to high temperature and low salinity mineralization, while the late mineralization stage was formed in low temperature and low salinity conditions, with the addition of meteoric water in late stage.The mineralization of this deposit might be related to the mixing between high-temperature silicon-rich hydrothermal and atmospheric water.The changes of temperature, pressure, pH and Eh promote the precipitation of ore-bearing minerals in the fluid to fill and crystallize as the molybdenum deposit.The H-O isotope of fluid inclusions indicates that the low hydrogen isotope values were caused by the mixing between magmatic hydrothermal and meteoric water, as well as affected by tectonic stress.When the hydrothermal migrated into the fissures of surrounding rock, the physical and chemical conditions were changed, and the molybdenite was filled into these fissures to form the molybdenum deposit.S isotope studies show that they were sourced from crustal sulfur, and the sulfur isotope values are close to the sulfur values of acid rock, thus they might be derived from the mixture of remelting hydrothermal magmatic rocks and atmospheric water.Finally, the genesis type of this deposit may be belonged to the late magmatic hydrothermal quartz vein filled-type deposit.关键词
成矿流体/地球化学特征/矿床成因/查干德尔斯/钼矿Key words
ore-forming fluids/geochemical characteristics/genesis/Chagandells/molybdenite分类
天文与地球科学引用本文复制引用
张艳飞,梁帅..内蒙古查干德尔斯钼矿成矿流体地球化学特征及矿床成因[J].西北地质,2017,50(2):106-114,9.基金项目
国家自然科学基金项目(40073013)和内蒙古自治区地质矿产勘查开发局勘查项(NMKD2008-01)联合资助 （40073013）
