福建中部龙岭花岗岩LA-ICP-MS锆石U-Pb测年
LA-ICP-MS Zircon U-Pb Dating of Longling Granit in Central Fujian Province
DOI: 10.12677/AG.2020.1010093, PDF,    科研立项经费支持
作者: 崔碧云, 黎敦朋：福州大学紫金矿业学院，福建 福州
关键词: 龙岭花岗岩；LA-ICP-MS锆石U-Pb测年；志留纪；Longling Granit； LA-ICP-MS Zircon U-Pb Dating； Siluran
摘要: 龙岭花岗岩位于福建省中部，总体呈南北向展布，出露面积约为120 km2，岩性为灰白色似斑状二长花岗岩和二长花岗岩。前人将其时代划归为二叠纪或石炭纪，但地质图显示其上与上泥盆统天瓦岽组呈沉积不整合接触。为了确定龙岭花岗岩的形成时代，本文对龙岭花岗岩进行了LA-ICP-MS锆石U-Pb测年，获得206U/238Pb加权平均年龄为432.8 ± 4.8 Ma (n = 20, MSWD = 0.0092)，表明龙岭花岗岩侵位时代为志留纪，是加里东期岩浆活动的产物，而不是二叠纪或石炭纪侵位的花岗岩，这对华夏地块早古生代岩浆演化提供了新资料。
Abstract: The Longling granite is located in the central part of Fujian Province, which is distributed in a north-south direction and the distribution area is about 120 km2. It is mainly composed of gray-white porphyritic monzonitic granite and monzonitic granite. The predecessors classified its age as Permian or Carboniferous; however the geological map shows that it is in sedimentary unconformity contact with the Upper Devonian Tianwadi Formation. In order to determine the formation age of the Longling granite, this paper has carried out LA-ICP-MS zircon U-Pb dating on the Longling granite. The weighted average age of 206U/238Pb is 432.8 ± 4.8 Ma (n = 20, MSWD = 0.0092), indicating that the intrusive age of the Longling granite is the Silurian, which is the product of Caledonian magmatic activity, rather than the Permian or Carboniferous, and which provides new data for the early Paleozoic magmatic evolution of the Cathaysia block.
文章引用：崔碧云, 黎敦朋. 福建中部龙岭花岗岩LA-ICP-MS锆石U-Pb测年[J]. 地球科学前沿, 2020, 10(10): 943-949. https://doi.org/10.12677/AG.2020.1010093

参考文献

[1] 刘民武, 郝英. 激光剥蚀等离子质谱微区分析在固体地球科学中的应用进展[J]. 地球科学进展, 2003, 18(1): 116-121.
[2] 王瑜, 周丽云. 从同位素年代学到构造年代学[J]. 地质通报, 2008, 27(12): 2014-2019.
[3] 田朋飞, 袁万明, 杨晓勇. 热年代学基本原理、重要概念及地质应用[J]. 地质论评, 2020, 66(4): 975-1004.
[4] 朱玉磷, 黄长煌. 福建龙岭岩体同位素年龄及其地质意义[J]. 岩石学报, 1989, 5(3): 45-53.
[5] 福建省闽西地质大队. 贡川幅一比五万区域地质图及说明书[M]. 福州: 福建省地质测绘队印刷厂, 1990.
[6] 福建省地质调查研究院. 三明市幅一比二十五万区域地质图及说明书[M]. 三明: 福建省三明地质印刷厂, 2002.
[7] 福建省地质调查研究院. 中国区域地质志福建志[M]. 北京: 地质出版社, 2016: 1-900.
[8] 福建省地质矿产局. 福建省地质图说明书[M]. 福州: 福建省地图出版社, 1998: 20-35.
[9] 福建省地质矿产局. 福建省岩石地层[M]. 武汉: 中国地质大学出版社, 1997: 7-115.
[10] 徐先兵, 张岳桥, 舒良树, 等. 闽西南玮埔岩体与赣南菖蒲混合岩锆石La-ICPMS U-Pb年代学: 对武夷山加里东运动时代的约束[J]. 地质论评, 2009, 55(2): 277-285.
[11] 张爱梅, 王岳军, 范蔚茗, 等. 闽西南清流地区加里东期花岗岩锆石U-Pb年代学及Hf同位素组成研究[J]. 大地构造与成矿学, 2010, 34(3): 408-418.
[12] 肖爱芳, 王治淇, 黎敦朋. 闽西南新冲正长花岗岩LA-ICP-MS锆石U-Pb测年及其找矿意义[J]. 地球科学前沿, 2017, 7(3): 349-355.
[13] 阳伶俐, 黎敦朋, 宋春伦, 等. 闽西南清流县旧场三叠纪钼矿化正长花岗岩LA-ICPMS锆石U-Pb年龄及其找矿意义[J]. 矿物学报, 2017, 37(S1): 51.
[14] Chen, A. (1999) Mirror-Image Thrusting in the South China Orogenic Belt: Tectonic Evidence from Western Fujian, Southeastern China. Tectonophysics, 305, 497-519. [Google Scholar] [CrossRef] 
[15] Yuan, H.L., Gao, S., Liu, X.M., et al. (2004) Accurate U-Pb Age and Trace Element Determinations of Zircon by Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry. Geostandards and Geo-Analytical Research, 28, 357-370. [Google Scholar] [CrossRef] 
[16] 吴元宝, 郑永飞. 锆石成因矿物学研究及其对U-Pb年龄解释的制约[J]. 科学通报, 2004, 16(49): 1589-1604.
[17] Williams, I.S. and Claesson, S. (1987) Isotope Evidence for the Precambrian Province and Caledonian Metamorphism of High Grade Paragneisses from the Seve Nappes, Scandinavian Caledonides, Ⅱ. Ion Microprobe Zircon U-Th-Pb. Contributions to Mineralogy and Petrology, 97, 205-217. [Google Scholar] [CrossRef] 
[18] Wiliiams, I.S. and Buick, C.I. (1996) An Extended Episode of Early Mesoproterozoic Metamorphic Fluid Flow in the Reylolds Range, Central Australia. Journal of Metamorphic Geology, 14, 29-47. [Google Scholar] [CrossRef] 
[19] 樊隽轩, 彭善池, 侯旭东, 等. 国际地层委员会官网与《国际地层表》(2015/01版) [J]. 地层学杂志, 2015, 39(2): 125-134.
[20] 陈正宏, 李寄禺, 谢佩珊, 等. 利用EMP独居石定年法探讨浙闽武夷山地区变质基底岩石与花岗岩的年龄[J]. 高校地质学报, 2008, 14(1): 1-15.
[21] Zhang, Q., Jiang, Y.-H., Wang, G.-C., et al. (2015) Origin of Silurian Gabbros and I-Type Granites in Central Fujian, SE China: Implications for the Evolution of the Early Paleozoic Orogen of South China. Lithos, 216-217, 285-297. [Google Scholar] [CrossRef] 
[22] 张芳荣, 舒良树, 王德滋, 等. 华南加里东期花岗岩类形成构造背景探讨[J]. 地学前缘, 2009, 16(1): 248-260.
[23] 朱清波, 黄文成, 孟庆秀, 等. 华夏地块加里东期构造事件: 两类花岗岩的锆石U-Pb年代学和Lu-Hf同位素制约[J]. 中国地质, 2015, 42(6): 1715-1739.
[24] 关义立, 袁超, 龙晓平, 等. 华南早古生代花岗岩中暗色包体的成因: 岩石学、地球化学和锆石年代学证据[J]. 大地构造与成矿学, 2016, 40(1): 109-124