华北克拉通南缘泌阳春水燕山期铝质A型花岗岩类:年代学、地球化学及其启示

被引:45
作者
周红升 [1 ,2 ]
马昌前 [1 ]
张超 [1 ]
陈玲 [1 ]
张金阳 [1 ]
佘振兵 [1 ]
机构
[1] 中国地质大学地球科学学院
[2] 信阳师范学院城市与环境科学系
基金
国家自然科学基金重点项目;
关键词
华北克拉通南缘; 燕山期; 铝质A型花岗岩; 锆石LA-ICPMS年代学;
D O I
暂无
中图分类号
P588.121 [];
学科分类号
摘要
出露于华北克拉通南缘泌阳春水及其附近的黄山、祖师顶和角子山三个花岗岩体主要侵位于汝阳群和新元古代花岗岩中,本文采用锆石LA-ICPMS U-Pb定年方法,获得三个岩体的主体岩性黑云母二长花岗岩的岩浆锆石年龄分别为132.8±0.8Ma、131.9±1.1 Ma和120.9±0.8Ma,代表岩体的结晶年龄。三个岩体的岩性虽有差异,但主体岩性均为黑云母二长花岗岩,主要矿物为微斜条纹长石,暗色矿物为黑云母。三个岩体的地球化学特征均表现为高硅、高钾、贫Mg、贫Ca、高碱度率、高FeO*/MgO比,和相对富集高场强元素Ta、Zr、Hf以及总体亏损不相容元素Ba、P、Sr、Ti和Nb等特征。SiO2含量较高且变化范围较宽,K2O/Na2O比较高,主要属高钾钙碱性系列,A/CNK在1.023~1.094之间,属弱过铝质,MgO和CaO含量较低。微量(包括稀土)元素特征总体相似,∑REE含量总体较低,LREE相对HREE元素富集,具弱-中等负铕异常,(La/Yb)N比9.32~42.43,Ga/Al(10~4Ga/Al)比、Nb/Ta比、Rb/Nb比均与A型花岗岩的类似;t2DM约为2.0Ga,εNd(t)值在- 12.4~-13.5之间,与秦岭群负片麻岩的相似,(87Sr/86Sr)i初始比值在0.70648~0.70823之间,表明物源来源于壳源。综合分析表明,三个岩体的花岗岩均为壳源铝质A2型(PA型)花岗岩,岩浆主要来源于早期俯冲进入华北克拉通南缘下部地壳中的北秦岭古老基底秦岭群负片麻岩的部分熔融以及分异作用,源岩熔融的热量主要由拆沉作用诱发的软流圈上涌物质的底侵作用提供。黄山、祖师顶和角子山三个花岗岩体形成于燕山期古太平洋板块对欧亚板块俯冲引起的岩石圈伸展环境。
引用
收藏
页码:49 / 64
页数:16
相关论文
共 77 条
[1]  
A-type granites and related rocks: Evolution of a concept; problems and prospects.[J].Bernard Bonin.LITHOS.2007, 1
[2]  
Nature and significance of the Early Cretaceous giant igneous event in eastern China.[J].Fu-Yuan Wu;Jing-Qian Lin;Simon A. Wilde;Xiao'Ou Zhang;Jin-Hui Yang.Earth and Planetary Science Letters.2005, 1
[3]  
Petrogenesis of the Mesozoic intrusive complexes from the southern Taihang Orogen; North China Craton: elemental and Sr–Nd–Pb isotopic constraints.[J].B. Chen;B. M. Jahn;Y. Arakawa;M. G. Zhai.Contributions to Mineralogy and Petrology.2004, 4
[4]  
Do coeval mafic and felsic magmas in post-collisional to within-plate regimes necessarily imply two contrasting; mantle and crustal; sources? A review.[J].Bernard Bonin.LITHOS.2004, 1
[5]  
Silurian A-type granitoids in the southern margin of the Tongbai-Dabieshan: Evidence from SHRIMP zircon geochronology and geochemistry.[J].Changqian Ma;Zhenbing She;Pin Xu;Lingyan Wang.Science in China Series D: Earth Sciences.2005, 8
[6]  
A review of the geodynamic setting of large-scale Late Mesozoic gold mineralization in the North China Craton: an association with lithospheric thinning.[J].Jin-Hui Yang;Fu-Yuan Wu;Simon A. Wilde.Ore Geology Reviews.2003, 3
[7]  
Re–Os evidence for replacement of ancient mantle lithosphere beneath the North China craton.[J].Shan Gao;Roberta L Rudnick;Richard W Carlson;William F McDonough;Yong-Sheng Liu.Earth and Planetary Science Letters.2002, 3
[8]   Pb, Sr, and Nd isotopic features in organic matter from China and their implications for petroleum generation and migration [J].
Zhu, BQ ;
Zhang, JL ;
Tu, XL ;
Chang, XY ;
Fan, CY ;
Liu, Y ;
Liu, JY .
GEOCHIMICA ET COSMOCHIMICA ACTA, 2001, 65 (15) :2555-2570
[9]  
The roots of the Dabieshan ultrahigh-pressure metamorphic terrane: constraints from geochemistry and Nd–Sr isotope systematics.[J].Changqian Ma;Carl Ehlers;Changhai Xu;Zhichang Li;Kunguang Yang.Precambrian Research.2000, 3
[10]   A review of the relationships between granitoid types, their origins and their geodynamic environments [J].
Barbarin, B .
LITHOS, 1999, 46 (03) :605-626