阿尔泰南缘麦兹盆地康布铁堡组变质酸性火山岩年龄及岩石成因

被引:15
作者
柴凤梅 [1 ]
杨富全 [2 ]
刘锋 [2 ]
耿新霞 [2 ]
张志欣 [2 ]
陈斌 [1 ]
机构
[1] 新疆中亚造山带大陆动力学与成矿预测实验室
[2] 中国地质科学院矿产资源研究所
关键词
变质酸性火山岩; 地球化学; LA-ICP-MS锆石U-Pb定年; 阿尔泰南缘;
D O I
暂无
中图分类号
P588.14 [喷出岩(火山岩)];
学科分类号
070901 [矿物学、岩石学、矿床学];
摘要
阿尔泰南缘麦兹盆地康布铁堡组赋存有铁铅锌大、中型矿床,但该组火山岩的形成时代和岩石成因以及构造背景还没有形成一致的认识。本文对该组两个变质流纹岩样品进行了LA-ICP-MS锆石U-Pb年龄测定,获得其年龄分别为410.5±1.3 Ma和400.4±2.1 Ma。岩石地球化学分析结果表明:所有酸性火山岩具有高硅(72.15%~81.26%),低铝(10.56%~14.87%)和钛(0.16%~0.27%),极低的MgO(0.04%~0.14%)、CaO(0.04%~2.42%)和TFeO(0.11%~1.64%)含量;在原始地幔标准化图上显示出Ti、P、Sr、Ba、Nb和Ta明显负异常,Th、U、Pb、Zr和Hf的正异常,LREE相对HREE略富集的特征,除个别样品外,大多数样品显示明显的Eu负异常(δEu=0.48~0.91)。结合其区域地质特征,认为本区变质酸性火山岩形成于活动大陆边缘环境,是玄武质岩浆底侵作用使下地壳发生了部分熔融后演化的产物。
引用
收藏
页码:221 / 239
页数:19
相关论文
共 26 条
[1]
In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard.[J].Yongsheng Liu;Zhaochu Hu;Shan Gao;Detlef Günther;Juan Xu;Changgui Gao;Haihong Chen.Chemical Geology.2008, 1
[2]
Accretionary orogenesis of the Chinese Altai: Insights from Paleozoic granitoids.[J].Chao Yuan;Min Sun;Wenjiao Xiao;Xianhua Li;Hanlin Chen;Shoufa Lin;Xiaoping Xia;Xiaoping Long.Chemical Geology.2007, 1
[3]
Timing, petrogenesis, and setting of Paleozoic synorogenic intrusions from the Altai Mountains, northwest China: Implications for the Tectonic evolution of an accretionary orogen [J].
Wang, Tao ;
Hong, Da-wei ;
Jahn, Bor-ming ;
Tong, Ying ;
Wang, Yan-bin ;
Han, Bao-fu ;
Wang, Xiao-xia .
JOURNAL OF GEOLOGY, 2006, 114 (06) :735-751
[4]
Geochemistry of late Paleozoic mafic igneous rocks from the Kuerti area, Xinjiang, northwest China: implications for backarc mantle evolution [J].
Xu, JF ;
Castillo, PR ;
Chen, FR ;
Niu, HC ;
Yu, XY ;
Zhen, ZP .
CHEMICAL GEOLOGY, 2003, 193 (1-2) :137-154
[5]
Neoproterozoic to Paleozoic geology of the Altai orogen, NW China:: New zircon age data and tectonic evolution [J].
Windley, BF ;
Kröner, A ;
Guo, JH ;
Qu, GS ;
Li, YY ;
Zhang, C .
JOURNAL OF GEOLOGY, 2002, 110 (06) :719-737
[6]
Zircon trace element geochemistry: partitioning with garnet and the link between U–Pb ages and metamorphism.[J].Daniela Rubatto.Chemical Geology.2002, 1
[7]
The composition of the Earth.[J].W.F. McDonough;S.-s. Sun.Chemical Geology.1995, 3
[8]
GEOCHEMICAL AND ISOTOPIC VARIATIONS IN THE CALC-ALKALINE ROCKS OF AEOLIAN ARC, SOUTHERN TYRRHENIAN SEA, ITALY - CONSTRAINTS ON MAGMA GENESIS [J].
FRANCALANCI, L ;
TAYLOR, SR ;
MCCULLOCH, MT ;
WOODHEAD, JD .
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY, 1993, 113 (03) :300-313
[9]
MASS CHANGE CALCULATIONS IN ALTERED ROCK SERIES [J].
MACLEAN, WH .
MINERALIUM DEPOSITA, 1990, 25 (01) :44-49