东南极普里兹湾地区花岗岩类的锆石U-Pb年龄、地球化学特征及其构造意义

被引:24
作者
李淼
刘晓春
赵越
机构
[1] 中国地质科学院地质力学研究所
关键词
东南极; 普里兹湾; 花岗岩类; 后碰撞;
D O I
暂无
中图分类号
P588.121 [];
学科分类号
摘要
东南极普里兹湾地区出露大量泛非期花岗质岩类,利用LA-ICP-MS锆石U-Pb原位定年方法测得达尔克花岗岩、蒙罗克尔花岗岩和阿曼达花岗岩的年龄分别为519±2Ma,497±2Ma和498±7Ma。所有普里兹湾地区花岗岩类均具有较高的全碱含量以及K2O/Na2O、FeOT/(FeOT+MgO)和10~4Ga/Al比值,较低的Mg、Ca、Cr和Ni丰度,表现出A型花岗岩的特点,同时还富集大离子亲石元素和稀土元素,不同程度亏损Sr、Nb、Ta、P和Ti,并具有高87Sr/86Sr初始比值和低εNd(t)值的同位素特征。研究结果表明,普里兹湾地区的岩浆活动可能与后碰撞的造山作用有关,包括岩石圈减薄、岩浆底侵和地壳伸展作用等。普里兹湾A型后碰撞花岗岩的确定支持普里兹带为碰撞造山带的构造属性。
引用
收藏
页码:1055 / 1066
页数:12
相关论文
共 18 条
[1]   东北地区新生代侵入体的锆石激光探针U-Pb年龄测定与稀土元素成分分析 [J].
袁洪林 ;
吴福元 ;
高山 ;
柳小明 ;
徐平 ;
孙德有 .
科学通报, 2003, (14) :1511-1520
[2]   我国花岗岩研究的回顾与展望 [J].
王德滋 ;
周金城 .
岩石学报, 1999, (02) :2-10
[3]   岩浆长期分离结晶对岩石锶同位素初始比值的影响 [J].
刘昌实 ;
杨心宜 .
大地构造与成矿学, 1991, (02) :152-159
[4]  
Determination of U-Pb age and rare earth element concentrations of zircons from Cenozoic intrusions in northeastern China by laser ablation ICP-MS[J] . Honglin Yuan,Fuyuan Wu,Shan Gao,Xiaoming Liu,Ping Xu,Deyou Sun.Chinese Science Bulletin . 2003 (22)
[5]  
Correction of common lead in U–Pb analyses that do not report 204 Pb[J] . Tom Andersen.Chemical Geology . 2002 (1)
[6]  
Rodinia refined or obscured: palaeomagnetism of the Malani igneous suite (NW India)[J] . T.H. Torsvik,L.M. Carter,L.D. Ashwal,S.K. Bhushan,M.K. Pandit,B. Jamtveit.Precambrian Research . 2001 (3)
[7]  
Contrasting geochemical and Sm-Nd isotopic compositions of Archean metasediments from the Kongling high-grade terrain of the Yangtze craton: evidence for cratonic evolution and redistribution of REE during crustal anatexis[J] . Shan Gao,Wenli Ling,Yumin Qiu,Zhou Lian,Gerald Hartmann,Klaus Simon.Geochimica et Cosmochimica Acta . 1999 (13)
[8]  
The evolution of a layered metaigneous complex in the Rauer Group, East Antarctica: evidence for a distinct Archaean terrane[J] . S.L. Harley,I. Snape,L.P. Black.Precambrian Research . 1998 (3)
[9]  
Crustal evolution of the East Antarctic mobile belt in Prydz Bay: continental collision at 500 Ma?[J] . P.H.G.M. Dirks,C.J.L. Wilson.Precambrian Research . 1995 (3)
[10]  
KAr, 40 Ar 39 Ar and apatite fission-track evidence for Neoproterozoic and Mesozoic basement rejuvenation events in the Heimefrontfjella and Mannefallknausane (East Antarctica)[J] . J. Jacobs,H. Ahrendt,H. Kreutzer,K. Weber.Precambrian Research . 1995 (3)