长乐—南澳断裂带变形火成岩的U-Pb和^(40)Ar/^(39)Ar年龄  

U-Pb AND^(40)Ar/^(39)Ar DATINGS OF DEFORMED IGNEOUS ROCKS FROM THE CHANGLE-NAN'AO FAULT

作　　者：李武显[1] 周新民[2] 李献华[1] 

机构地区：[1]中国科学院广州地球化学研究所 [2]南京大学地球科学系,南京210093

出　　处：《地质科学》2003年第1期22-30,共9页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金 (批准号 :4 9672 1 0 4;4 9632 0 80 );中国科学院知识创新工程 (KZCX2-1 0 2 )资助。

摘　　要：长乐—南澳断裂带中同构造变形的花岗闪长岩主岩和闪长岩包体的锆石U Pb法和角闪石40 Ar/39Ar法定年结果分别为～ 1 30Ma和～ 95Ma。锆石U Pb年龄代表了变形花岗质岩石的形成年龄 ,也表明长乐—南澳断裂带至少在此时已经开始活动。角闪石40 Ar/39Ar年龄不能代表长乐—南澳断裂带的活动年龄 ,它记录的是与大规模、未变形的早白垩世晚期 (相当于石帽山群 )火成活动相关的热变质事件的时间。The zircon U-Pb and hornblende 40Ar/ 39Ar ages of the syntectonic deformation granodiorite and diorite from the Changle-Nan'ao Fault were ～130 Ma and ～ 95 Ma, respectively. The former (zircon age) represented the age of deformation granitoids, which suggested that the Changle-Nan'ao Fault had acted since ～130 Ma ago. The hornblende 40Ar/ 39Ar dating age did not represent the activity age of the Changle-Nan'ao Fault, which was the ages of thermal metamorphic event caused by the widely occurred undeformed igneous rocks in age of Late Cretaceous when the undeformed Shimaoshan Group deposited, and the followed event of mantle uplifting rapidly.

关 键 词：火成岩 锆石U-Pb定年 角闪石 ^40Ar/^39Ar定年 变形花岗质岩石 长乐-南澳断裂带 氩同位素 

分 类 号：P588.1[天文地球—岩石学] P597.3[天文地球—地质学]