新疆西准噶尔地区塔斯特岩体锆石LA-ICPMS年龄及其意义  

LA-ICP MS zircon age of Tasite pluton in Sawuer region of west Junggar,Xinjiang.

作　　者：范裕[1] 周涛发[1] 袁峰[1] 谭绿贵[1] David COOKE Sebastien MEFFRE 杨文平 何立新 

机构地区：[1]合肥工业大学资源与环境工程学院,合肥230009 [2]澳大利亚塔斯马尼亚大学优秀矿床研究中心(CODES) [3]新疆地质勘查局第四地质大队,阿勒泰836500

出　　处：《岩石学报》2007年第8期1901-1908,共8页Acta Petrologica Sinica

基　　金：国家重点基础研究发展规划项目(2007C13411304;2001CB409800);国家自然科学基金项目;安徽省优秀青年科技基金项目资助.

摘　　要：西准噶尔萨吾尔地区地处新疆阿勒泰地区吉木乃县及塔城地区和丰县。酸性侵入岩在区内较发育,其研究对于准噶尔地区后碰撞构造-岩浆演化时限的厘定具有重要的意义。塔斯特岩体是萨吾尔地区重要的复式花岗岩体,与区内铜、金矿化关系密切。塔斯特岩体锆石 LA—ICPMS 年龄为337±4Ma(1σ),形成于早石炭世。结合已有的地球化学特征研究,这一年龄显示西准噶尔地区在早石炭世已处于后碰撞环境。本文获得的塔斯特岩体成岩年龄是目前在准噶尔地区获得的最老的后碰撞花岗岩锆石 U—Pb 年龄之一,为准噶尔地区后碰撞构造-岩浆演化时限的厘定提供了新的证据。Sawuer region is located in west Junggar, Jimunai County of Ahay district and Hefeng county of Tacheng district, Xinjiang province. The region is along the north margin of the Kazakstan-Junggar Plate. I- and A-type granites are widespread in Sawuer region. The Tasite pluton is an important multiple granitic intrusion which has close relationship with the Cu and Au mineralization. According to the LA-ICP MS age dating result of zircon, the crystallization age of Tasite intrusion is 337± 4Ma（lυ） , corresponding to the early Carboniferous. The previous study on geological and geochemical characteristics has indicated that the Tasite pluton belongs to post-collisional granite. Therefore the west Junggar was in the post-collisional setting in early Carboniferous. The zircon U-Pb age of the Tasite pluton in this paper is one of the eldest ages of post-collisional granites in Junggar reported so far, providing a new evidence for confining the time framework of post-collisional period in Junggar.

关 键 词：花岗岩 塔斯特岩体 LA-ICPMS 后碰撞 萨吾尔 准噶尔 新疆 

分 类 号：P588.121[天文地球—岩石学] P597.3[天文地球—地质学]