摘要
新疆地跨中亚和特提斯两大构造域,构造-岩浆活动强烈,形成了许多斑岩型铜矿床,这些矿床具集中分布、分段集中特点.在新疆北部围绕准噶尔盆地呈面状环状分布,在新疆南部沿康西瓦断裂附近呈带状分布.新疆斑岩铜矿床形成时代漫长,从奥陶纪到三叠纪,集中在泥盆—二叠纪.成矿环境包括板块俯冲形成的岛弧、陆缘弧及后碰撞板内环境.含矿岩浆为幔源岩浆,发育高氧逸度的中酸性钙碱性岩浆和低氧逸度的中性钙碱性岩浆,含矿岩体定位受区域褶皱、断裂和火山机构的控制.金属元素组合主要为Cu-Au、Cu-Mo和Mo-Cu等,发育斑岩型-浅成低温热液型和斑岩型-矽卡岩型成矿系统.金属元素在中低温条件下富集成矿.
Xinjiang is located in the central section of the Central Asian and Tethyan Orogenic Belts.The intensive tectonic-magma activity occurred in Xinjiang.It led to the formation of many porphyry copper deposits.They are circularly present around the Junggar block in the north Xinjiang and are zonal distribution nearly to the Kangxiwa fault in the south Xinjiang.The ages of the porphyry copper deposits in Xinjiang indicates a range from Ordovician to Triassic and focus on the Late Paleozoic.They occurred in ocean island arc and continental arc related to plated subduction and intreplated setting at post collosion period.The ore-bearing porphyries are characterized by considerable mantle-derived component and have a predominantly calc-alkaline intermediate-acidic composition with high fO2 and minor calc-alkaline intermediate composition with lower f O2.The location of the ore-bearing porphyries is controlled by regional fold,fault and volcanic apparatus.The porphyry copper deposits have dominant Cu-Au,Cu-Mo and Mo-Cu assemblages which developed two intrusion-centered hydrothermal systems： porphyry-skarn and porphyry-epithermal hydrothermal systems.The ore-forming fluids are deposited in the low-to-moderate temperature.
出处
《新疆地质》
CAS
CSCD
北大核心
2010年第4期358-364,共7页
Xinjiang Geology
基金
国家305项目(2006BAB07B01-01、2006BAB07B01-02、2006BAB07B01-03、2006BAB07B01-04)联合资助
关键词
新疆
斑岩型铜矿床
成矿时代
成矿特点
Xinjiang
Porphyry copper deposit
Metallogenic ages
Metallogenic characteristic
