摘要
土屋-延东是东天山发现的最大铜多金属矿田,延东铜矿是该矿田主要产铜区.延东铜矿主要矿石类型有两类：闪长玢岩中浸染状矿石和斜长花岗斑岩中细脉浸染状、块状矿石;围岩蚀变主要为绢英岩化、绿泥石-黑云母化和青磐岩化,蚀变分带不明显.成矿流体包裹体研究表明,成矿流体温度较低（均一温度为110℃~240℃）,盐度变化较大（0.68%~52.5%）,成矿流体组成具多源性,CH4占很大比例,以富含有机质成分为特征.氢、氧同位素组成表明,早期成矿流体以岩浆水为主,晚期为上升岩浆流体与地层中大气降水混合产物.含矿斜长花岗斑岩体SIMS锆石U-Pb年龄为（338.3±1.4）Ma,含矿岩体形成时限为早石炭世.
Located in the northern margin of the Zhungaer-Kazakesitan plate which this plate was collided with Trim plate,the Yandong porphyry copper deposit is one of the important deposit in the well-known east Tianshan copper-concentrated region.Copper and its mineralizations occur within the Carboniferous volcanic sequences of the Qi＇eshan group.Sulfur isotopic analysis results reveal that ore-forming material was mainly derived from deep sources,and the oxygen results reveal that magma was mainly derived from a mixed source of igneous rocks and upper crust rocks,it imply that the magma came from upper mantle,but was mixed with a small amount of crust material.Re-Os and Ar-Ar isotope dating show that copper deposit have two group ages,viz early Carboniferous（347.3±2.1Ma）and middle Carboniferous（322.7±3Ma）,SIMS zircon and Lu-Hf U-Pb dating results suggest that granite-porphyry emplacement between 338 Ma and 336ma,make-up the Devonian-Carboniferous Qi＇eshang island arc magmatic belt on the palaeogeographically margin between the Tarim plate and Zhungaer-Kazakesitan plate.
出处
《新疆地质》
CAS
CSCD
北大核心
2010年第4期419-426,共8页
Xinjiang Geology
基金
中国科学院知识创新工程重要方向性项目(KZCX2-YW-107)
新疆国家“十一五”国家科技支撑计划重点项目(2007BAB25B04,2007BAB07B03-01-01)
国家重点基础研究发展规划项目(2007CB411307)共同资助
关键词
新疆
延东
斑岩铜矿床
斜长花岗斑岩
流体包裹体
Xinjiang
Yandong
porphyry copper deposit
granite-porphyry
fluid inclusion
