山东招远金岭金矿埠南矿区正长斑岩锆石U-Pb年龄及其与成矿的关系  

Ziron U-Pb dating and its relationship with mineralization of orthoclase porphyry in Bunan gold mine,Jinling gold deposit of Zhaoyuan,Shandong

作　　者：刘凯[1] 孙丰月[1] 王力[1] 

机构地区：[1]吉林大学地球科学学院,长春130061

出　　处：《世界地质》2014年第2期367-375,共9页World Geology

基　　金：国土资源部公益性行业科研项目(200911007-27)

摘　　要：金岭金矿埠南矿区位于胶东金矿集中区的西北部,受控于灵北断裂上盘的次级断裂。矿区内脉岩以正长斑岩为主,锆石LA-ICP-MS U-Pb年代学研究表明,正长斑岩形成于94.2±2.0 Ma,属晚白垩世。结合地质特征提出,正长斑岩脉的侵入带来了另一期含矿热液,使1#脉具有两期成矿叠加的特征,即早白垩世金的主成矿期和晚白垩世多金属-金银矿化期。根据已有的研究成果,认为招远地区酸性脉岩群可能为同一时期构造背景下的产物,并且与晚白垩世多金属-金银成矿作用具有密切关系,该区成岩成矿作用处于太平洋板块相对华北板块俯冲导致的弧后扩张环境。Bunan gold mine of Jinling gold deposit was located in the northwest of Jiaodong gold province,controlled by the secondary faults of Ling-Bei fault.LA-ICP-MS zircon U-Pb dating showed that the orthoclase porphyry formed in Late Cretaceous （the weighted average age 94.2 ± 2.0 Ma）.Researches showed that another stage of hydrothermal solution rose with the invision of orthoclase porphyry,and led to the superimposition of the major mineralization period of gold in Early Cretaceous and polymetallic-gold-silver mineralization in Late Creta ceous.Based on the existing research results,acidic dyke swarms of Zhaoyuan area were formd in the same tectonic setting and had a close connection with polymetallic-gold-silver mineralization in Late Cretaceous.It is suggested that the petrologenesis and mineralization were under the geodynamic setting of back-arc extension due to the subduction of Pacific Plate.

关 键 词：正长斑岩 多金属-金银矿化 构造体制 金岭金矿 胶东 

分 类 号：P618.51[天文地球—矿床学] P597[天文地球—地质学]