鞍山小岭子花岗岩地球化学及锆石SHRI MP年代学  

Geochemistry and zircon SHRIMP U-Pb chronology of Xiaolingzi granite in the Anshan area

作　　者：杜利林[1] 杨淳[1] 万渝生[1] 宋彪[1] 耿元生[1] 

机构地区：[1]中国地质科学院地质研究所,北京100037

出　　处：《岩石矿物学杂志》2005年第4期279-284,共6页Acta Petrologica et Mineralogica

基　　金：国土资源部中国地质调查项目(DKD2001020_3)

摘　　要：鞍山小岭子花岗岩岩浆锆石离子探针年龄为130.2±2.7Ma,形成于早白垩世。小岭子花岗岩高SiO2、Na2O+K2O、TFeO/MgO,富集轻稀土元素和高场强元素Zr、Nb、Y,低CaO、Ba、Sr,地球化学组成与该区大范围分布的千山花岗岩十分相似,具A型花岗岩特征,其形成与古太平洋板块俯冲至中国大陆东部之下引起的拉张有关。Zircon SHRIMP U_Pb age dating indicates that the Xiaolingzi granite in the Anshan area was emplaced during Early Cretaceous(130.2±2.7 Ma). It is enriched in SiO_2, Na_2O+K_2O, TFeO/MgO, LREE, Zr, Nb and Y, and depleted in CaO, Ba and Sr, thus similar to the widely distributed Qianshan granite with the geochemical characteristics of A type granite in this area. It is suggested that the magmatic activity was related to an extension following the subduction of the paleo_Pacific Plate beneath eastern China.

关 键 词：锆石SHRIMP年龄 早白垩世 A型花岗岩 鞍山 古太平洋板块 

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