云南普朗复式岩体锆石U-Pb年龄和地球化学特征及其地质意义  

Single-grain zircon U-Pb isotopic ages,geochemistry and its implication of the Pulang complex in Ynnnan Province,China.

作　　者：庞振山[1] 杜杨松[1] 王功文[1] 郭欣[1] 曹毅[1] 李青[1] 

机构地区：[1]中国地质大学(北京),北京100083

出　　处：《岩石学报》2009年第1期159-165,共7页Acta Petrologica Sinica

基　　金：云南迪庆有色金属有限责任公司专项合作项目(编号0632)资助成果.

摘　　要：根据接触关系和岩石学特征将普朗复式岩体划分为三个阶段的侵入岩,即第一阶段的石英闪长玢岩,第二阶段的石英二长斑岩和第三阶段的花岗闪长斑岩。利用单颗粒锆石U-Pb法测定的早、中、晚三个阶段侵入岩的结晶年龄分别为221.0±1.0Ma、211.8±0.5Ma和206.3±0.7Ma。这些年龄数据结合岩石化学和锶同位素资料,表明普朗复式岩体是在印支期由壳幔混源岩浆多次涌动侵入形成的。The Pulang complex in Yunnan Province is divided into three stages of intrusions based on their contacting relationship and petrological characteristics. The lithologies of the intrusions include quartz dioritic porphyry formed in the first stage, quartz monzonitic porphyry in the second stage, and granodioritic porphyry in the third stage. The crystallization ages of the intrusions were determined by using the, single-grain zircon U-Pb method. The single-grain zircon U-Pb isotopic ages are defined as 221.0 +/- 1.0Ma, 211.8 +/- 0.5Ma and 206.3 +/- 0.7Ma for the first, second and third stages of intrusions, respectively. These data combined with the results of petrochemical and Sr isotopic analyses support the formation of the Pulang complex in the Indo-Chinese epoch by multi-stages of gushing emplacement of the magmas derived from mixing source of mantle with crust.

关 键 词：复式侵入岩体 单颗粒锆石U-PB年龄 壳幔混源岩浆 多次涌动侵入 云南普朗 

分 类 号：P597.3[天文地球—地球化学]