燕辽成矿带铜钼矿床时代与动力背景关系

Relationship Between Dynamic Background and Epoch of Copper-Molybdenum Metallogenic Belt in Yanshan-Liaoning

燕辽铜钼多金属成矿带是中国华北地台北缘重要的铜钼成矿带。燕辽地区与铜钼矿床有关的岩浆侵入活动主要集中在227 Ma、189.0~169.9 Ma、142.0~126 Ma 3个时期;铜钼矿床成矿时代主要集中于242.6~233.1 Ma、197.0~185.0 Ma、164.3~131.0 Ma 3个时期,铜钼多金属矿床的成矿作用与岩浆活跃期关系比较密切。该区内主要的多金属矿床的成矿动力学背景形成分别是:早期的板块碰撞动力源,中-晚三叠世的华北板块与西伯利亚板块相互碰撞后期的挤压造山作用阶段;中期为侏罗世的鄂霍茨克洋的消减到闭合及后期两大陆块持续碰撞挤压阶段;后期为板块俯冲,深部幔源物质上升,岩石圈减薄等的动力学作用阶段。

Yanliao Cu-Mo polymetallic metallogenic belt is an important Cu-Mo metallogenic belt in the northern margin of North China Plain.The magmatic intrusion activities related to Cu-Mo deposits in Yanliao area are mainly concentrated in 227 Ma,189.0~169.9 Ma and 142.0~126 Ma;The metallogenic epoch of Cu-Mo deposits is mainly concentrated in242.6~233.1 Ma,197.0~185.0 Ma and 164.3~131.0 Ma.The mineralization of Cu-Mo polymetallic deposits is closely related to the magmatic activity period.The metallogenic dynamic background of the main polymetallic deposits in this area are:the early plate collision power source,the middle-late Triassic North China plate and Siberia plate collision later extrusion orogenic stage;The middle Jurassic Okhotsk Ocean was reduced to the stage of closure and continuous collision and compression of the two continental blocks in the late stage;The late stage is plate subduction,deep mantle material rise,lithospheric thinning and other dynamic stage.