摘要
通过对阿尔金北缘地区铜金矿床的硫同位素研究,结合矿床地质特征,划分了区内矿床的成因类型,认为主要有3类:似层状海相火山沉积型铜多金属矿床、韧性剪切带型(铜)金矿床、受裂隙控制的脉状岩浆热液型铜多金属矿床。结合区域构造演化特点,探讨了矿床成因类型与区域构造演化阶段的关系,认为区域成矿作用可分为3个阶段:第一阶段为早古生代早中期板块构造海底扩张作用时期,形成以喀腊大湾为代表的海相火山沉积型铜多金属矿床;第二阶段是早古生代晚期板块构造聚合碰撞作用时期,形成以大平沟和红柳沟为代表的韧性剪切带型(动力变质热液型)(铜)金矿床;第三阶段是早古生代末板块构造碰撞后的岩浆活动和偏脆性断裂构造活动时期,形成以索尔库里北山和拉配泉为代表的受裂隙控制的岩浆热液型铜多金属矿床。从硫同位素特征、矿床成因类型及其与区域构造演化的关系上分析,该区具有较好的铜金多金属矿床找矿远景。
The northern margin of the Ahyn Tagh Mountains is one of the important metallogenic provinces recently found in northwestern China. Based on the sulfur isotope study of Cu-Au polymetallic deposits in the area, combined with the geological characteristics of the mineral deposits, the authors consider that there are mainly three genetic types of Cu-Au polymetallic deposit in the area： stratified submarine volcanic-sedimentary type Cu-polymetallic deposits, ductile shear zone type gold （Cu） deposits and lode magmatic hydrothermal type Cu-Au polymetallic deposits controlled by structural fractures. According to the characteristics of the tectonic evolution, the authors discuss the relation between the deposit genetic types and stages of tectonic evolution. Three mineralization stages may be distinguished. The first stage was a period of sea-floor spreading in the early-mid Early Paleozoic, forming submarine volcanic-sedimentary type Cu-polymetallic deposits represented by the Kaladawan copper deposit. The second stage was a period of plate convergence and collision in the mid-late Early Paleozoic, forming ductile shear zone type （dynamometamorphic hydrothermal type） （copper-） gold deposits represented by the Dapinggou and Hongliugou gold deposits. The third stage was a period of magmatic activity and brittle faulting after plate collision at the end of the Early Paleozoic, forming lode magmatic hydrothermal type copper-polymetallic deposits controlled by fractures, as exemplified by the Xorkol Beishan and Lapeiquan deposits. Based on an analysis of the sulfur isotope features and the genetic types of the copper-gold deposits and their relation to the tectonic evolution, the authors suggest that this area has favorable prospects for copper-gold polymetallic deposits.
出处
《地质力学学报》
CSCD
2007年第2期131-140,共10页
Journal of Geomechanics
基金
国家技术支撑计划项目(编号:2006BAB07B02-04)
中国科学院创新工程项目(编号:kzcx2-yw-107-03)资助
关键词
铜多金属矿床
硫同位素
成因类型
区域构造演化
阿尔金北缘
sulfur isotope
Cu-Au polymetallic deposit
genetic type
tectonic evolution
northern margin of the Ahyn Tagh Mountains
