青海省德尔尼铜矿床矿石特征及成因意义

Ore characteristics and genetic significance of the de Ni Ni copper deposit in Qinghai

德尔尼铜矿床位于青海省玛沁县境内,是一个大型铜多金属矿床。矿体呈透镜状或似层状,且与地层同褶皱;矿石矿物主要成分为黄铁矿、黄铜矿、磁黄铁矿等,化学成分为铜、锌、钴、硫;矿石结构以半自形-自形-它形粒状为主,其次为压碎、斑状变晶等。结合前人研究成果,认为德尔尼矿床与热液活动有密切关系,成矿温度为100℃~400℃之间,成矿时代为晚石炭世,成矿物质来源可能源于地幔,为中低温海底热液喷流沉积矿床。

The Qinghai copper deposit is a large copper polymetallic deposit.The ore bodies are lenslike or like layered and fold with the formation;the ore minerals are mainly pyrite,chalcopyrite and pyrrhotite,and the chemical composition is copper,zinc,cobalt and sulfur,and the ore structure is dominated by semi-self-form-its granular,followed by crushing,porphyritic and crystalline.According to the previous research results,it is believed that the deel deposit is closely related to the hydrothermal activity,the metallogenic temperature is between 100 and 400 C,the metallogenic epoch is late Carboniferous,and the source of the metallogenic material may be derived from the mantle,which is a medium low temperature seabed hydrothermal deposit deposit.