西藏拉萨地块过铝质花岗岩中继承锆石的物源区示踪及其古地理意义

被引：13

作者：

朱弟成 ^{[1
]}

赵志丹 ^{[1
]}

牛耀龄 ^{[2
,3
]}

王青 ^{[1
]}

DILEK Yildirim ^{[4
]}

管琪 ^{[5
]}

刘勇胜 ^{[6
]}

莫宣学 ^{[1
]}

机构：

[1] 地质过程与矿产资源国家重点实验室中国地质大学地球科学与资源学院

[2] Department of Earth Sciences, Durham University

[3] 兰州大学地球科学学院

[4] Department of Geology, Miami

来源：

岩石学报 | 2011年 / 27卷 / 07期

关键词：

古地理; 拉萨-澳大利亚联系; 继承锆石U-Pb年龄; 过铝质花岗岩; 拉萨地块;

D O I：

暂无

中图分类号：

P588.121 [];

学科分类号：

摘要：

富含继承锆石的过铝质花岗岩一般来源于富铝质岩石(如变泥质岩)的部分熔融,因而分析这些继承锆石的U-Pb年龄可以像分析沉积岩碎屑锆石的U-Pb年龄一样,提供过铝质花岗岩源区物质中碎屑沉积物物源区的丰富信息。本文报道了中部拉萨地块早侏罗世过铝质花岗岩的全岩地球化学和锆石U-Pb年代学数据,结合拉萨地块已有二叠纪和晚三叠世过铝质花岗岩的继承锆石年代学数据,总结了目前已有的拉萨地块过铝质花岗岩的继承锆石U-Pb年龄特征(共199个谐和测点)。这些过铝质花岗岩属强过铝质S型花岗岩,其中的继承锆石定义了1250～1100Ma(峰值1181±14Ma)和550～450Ma(峰值494±7Ma)2个最突出的年龄群,分别可比于拉萨地块古生代沉积岩的碎屑锆石年龄峰值(约1170Ma)和寒武纪火山岩的侵位时代,明显不同于西羌塘、安多和特提斯喜马拉雅新元古代-古生代沉积岩中的碎屑锆石年龄频谱。拉萨地块过铝质花岗岩中约1181Ma的继承锆石,可能与拉萨地块古生代沉积岩中的同期碎屑锆石一样,都来自澳大利亚南西部Albany-Fraser造山带和东南极Wilkes等地,而约494的继承锆石,既可能来自澳大利亚西部,也可能来自拉萨地块本地。本文提供了拉萨地块与澳大利亚大陆北缘具有古地理联系的过铝质花岗岩继承锆石U-Pb年龄证据。拉萨地块的研究实践表明,采用过铝质花岗岩继承锆石和古生代沉积岩碎屑锆石相结合的锆石U-Pb年代学方法,可为重建冈瓦纳大陆北缘其它微陆块的古地理和构造岩浆演化提供重要约束。

引用

页码：1917 / 1930

页数：14

共 32 条

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