粤中从化地区佛冈岩基白垩纪花岗岩LA-ICP-MS 锆石U-Pb 年代学及地球化学特征

叶升明|李宏卫|何 翔|李 锐|何 斌. 2021. 粤中从化地区佛冈岩基白垩纪花岗岩LA-ICP-MS 锆石U-Pb 年代学及地球化学特征. 华南地质, 37(3): 265-279. doi: 10.3969/j.issn.2097-0013.2021.03.002
引用本文: 叶升明|李宏卫|何 翔|李 锐|何 斌. 2021. 粤中从化地区佛冈岩基白垩纪花岗岩LA-ICP-MS 锆石U-Pb 年代学及地球化学特征. 华南地质, 37(3): 265-279. doi: 10.3969/j.issn.2097-0013.2021.03.002
YE Sheng-Ming|LI Hong-Wei|HE Xiang|LI Rui|HE Bin. 2021. LA-ICP-MS Zircon U-Pb Chronology and Geochemistry of Cretaceous Granites from Fogang Batholith in the Conghua Area. South China Geology, 37(3): 265-279. doi: 10.3969/j.issn.2097-0013.2021.03.002
Citation: YE Sheng-Ming|LI Hong-Wei|HE Xiang|LI Rui|HE Bin. 2021. LA-ICP-MS Zircon U-Pb Chronology and Geochemistry of Cretaceous Granites from Fogang Batholith in the Conghua Area. South China Geology, 37(3): 265-279. doi: 10.3969/j.issn.2097-0013.2021.03.002

粤中从化地区佛冈岩基白垩纪花岗岩LA-ICP-MS 锆石U-Pb 年代学及地球化学特征

  • 基金项目:

    广东省及香港、澳门特别行政区区域地质志(项目编码:12120113012700)

    中山市多要素三维城市地质调查(项目编码:442000-201903-2019001-0011(ZZ21909738))

    中国地质调查局项目(项目编码:DD20160252-06,DD20160257-04)

详细信息
    作者简介: 叶升明(1991—),男,本科,工程师,主要从事区域地质矿产调查工作,E-mail:576971803@qq.com
  • 中图分类号: P588

LA-ICP-MS Zircon U-Pb Chronology and Geochemistry of Cretaceous Granites from Fogang Batholith in the Conghua Area

  • LA-ICP-MS 锆石 U-Pb 定年结果表明,粤中从化地区发育一套白垩纪花岗岩,其形成时代为~145 Ma,属佛冈岩基的一部分。地球化学研究表明,花岗岩的SiO2含量为71.9%~77.72%(平均74.89%),Al2O3含量为12.17%~14.42%(平均13.24%),A/CNK为1.31~1.49(平均值1.4),ALK全碱指数7.92~9.15(平均值8.5),为过铝质高钾钙碱性系列花岗岩。它们的稀土元素总量(ΣREE)为(128.8~393.8)×10-6,Eu具负异常,δEu值为0.1~0.4,LREE/HREEE值为2.2~13.3。具有富集Rb、U、La、Nd、Sm和Lu,强列亏损Ba、Nb、Sr、P和Ti等元素特点。元素地球化学特征显示其为高分异I型花岗岩,可能是在高温条件下幔源物质诱导下地壳部分熔融后引发古老地壳杂砂-泥质源岩部分熔融而形成。综合区域地质资料分析,从化地区花岗岩可能形成于古太平洋板块向欧亚板块俯冲的陆缘弧构造环境。
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收稿日期:  2021-03-27
修回日期:  2021-05-24

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