摘要
硐子铅锌矿床位于华北板块北缘成矿带与大兴安岭南段成矿带的叠置区。矿床主要受近东西向断裂控制,属于中低温热液脉型矿床。主控矿断裂F1-1成矿前表现为压性特征,成矿期表现为左行张扭特征,在断裂带产状变陡、走向偏北地段含矿性较好。与矿脉空间分布关系密切的燕山早期花岗斑岩为成矿提供了热动力和含矿热液。矿石中方铅矿、黄铁矿单矿物δ34SCDT值为-4.8×10^-3~1.4×10^-3,接近陨石值,表明硫主要来源于岩浆,铅锌含量高的围岩安山岩、燕山早期闪长岩、花岗闪长岩和花岗斑岩可能提供了主要的成矿物质。根据矿物组合空间变化特点推测含矿热液在矿区内自西部深层向东部浅层运移。花岗斑岩体、地表及浅部蜂窝状硅质破碎带、铁锰帽可作为本区找矿的直接标志。
Dongzi Pb--Zn deposit,located in overlapping area between the northern margin of North China Plate metallogenic belt and the southern section of Great Hinggan Mountains metallogenic belt,is mainly controlled by EW trending faults and belongs to epi-mesotherma vein-type deposits. The mainly ore-controlling fault F1- 1represents compressive characters in pre-mineralizing stage and sinistral tensile characters in mineralizing stage. The mineralization is rich in the location where the occurrence changes steeply and trending towards north. Granite-porphyry bodies in early Yanshan epoch,closely related to the spatial distribution of ore bodies,provided thermal power and ore-bearing hydrothermal solution for mineralization. The δ34SCDTof galena and pyrite in ore are- 4. 8 ×10^-3~ 1. 4 × 10^-3,similar to the meteorite value,showing sulfur mainly derived from magma. The surrounding rock andesite,diorite,granodiorite,granite porphyry with a high content of lead and zinc may provide the main ore-forming materials. According to the mineral assemblages varying characteristics in space,we speculate that ore-bearing hydrothermal solution migrated from the western deep section to the eastern shallow section within the mining area. Granite porphyry bodies,honeycomb siliceous fracture zones from the surface layer and ferromanga-nese caps can be the direct prospecting indicators in this area.
出处
《世界地质》
CAS
2015年第4期971-983,共13页
World Geology
基金
内蒙古地质勘查基金项目(11-3-kc-3)
关键词
内蒙古
硐子铅锌矿床
地质特征
控矿因素
找矿标志
Inner Mongolia
Dongzi Pb--Zn deposit
geological feature
ore-controlling factor
prospecting indicator
