| 北祁连造山带窑洞沟地区中奥陶世花岗岩成因——锆石U-Pb年代学和岩石地球化学制约 |
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| 引用本文： | 卜涛,王国强,唐卓,罗根根,朱涛,计波,过磊.北祁连造山带窑洞沟地区中奥陶世花岗岩成因——锆石U-Pb年代学和岩石地球化学制约[J].岩石矿物学杂志,2019,38(2):145-159. |
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| 作者姓名： | 卜涛 王国强 唐卓 罗根根 朱涛 计波 过磊 |
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| 作者单位： | 中国地质调查局造山带地质研究中心西安地质调查中心;自然资源部岩浆作用成矿与找矿重点实验室西安地质调查中心 |
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| 基金项目： | 中国地质调查局基金项目（DD20160012，DD20190812）；国家自然科学基金资助项目（41703038） |
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| 摘 要： | 对北祁连造山带窑洞沟地区花岗岩进行了LA-ICP-MS锆石U-Pb测年以及主量和微量元素地球化学分析,结果表明,窑洞沟花岗岩的结晶年龄为466±2 Ma。窑洞沟花岗岩具有较高的SiO_2(72.45%～80.18%)和全碱含量(Alk)(6.04%～8.12%),且K_2O含量低,K_2O/Na_2O值为0.07～0.71,里特曼指数在0.96～2.16之间,小于3.3,铝饱和指数(A/CNK)为0.94～1.01,为低钾到中钾钙碱性系列的准铝质岩石;在球粒陨石标准化的稀土元素配分模式图上表现出轻稀土元素富集的右倾型,具有中等的负Eu异常,δEu介于0.67～0.81之间,在原始地幔标准化的微量元素蛛网图上明显富集Rb、K等大离子亲石元素和Th、U等放射性元素,亏损Nb、Ta、Ti、P等高场强元素,在P_2O_5-SiO_2协变关系图上与Ⅰ型花岗岩趋势一致,在Y-Rb图上显示出分异Ⅰ型花岗岩的特征。结合区域地质背景,认为窑洞沟花岗岩的形成可能与北祁连洋盆持续向北俯冲导致弧后拉张伸展,诱发幔源岩浆岩底侵上升,致使古老地壳物质重熔形成母岩浆,再经历中等程度分离结晶作用有关,其岩浆具有岛弧岩浆属性,可能是由于弧后盆地在岛弧的基础上裂开或者其岩浆源区受到了俯冲板片流体/熔体的改造作用。
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| 关 键 词： | 锆石U-Pb定年 地球化学 I型花岗岩 弧后盆地 北祁连 甘肃 |
| 收稿时间： | 2018/9/25 0:00:00 |
Petrogenesis of the middle Ordovician granite in the Yaodonggou area of the North Qilian orogenic belt: Constraints from zircon U-Pb geochronology and geochemistry |
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| BU Tao,WANG Guo-qiang,TANG Zhuo,LUO Gen-gen,ZHU Tao,JI Bo and GUO Lei.Petrogenesis of the middle Ordovician granite in the Yaodonggou area of the North Qilian orogenic belt: Constraints from zircon U-Pb geochronology and geochemistry[J].Acta Petrologica Et Mineralogica,2019,38(2):145-159. |
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| Authors: | BU Tao WANG Guo-qiang TANG Zhuo LUO Gen-gen ZHU Tao JI Bo and GUO Lei |
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| Institution: | Research Center for Orogenic Geology, Xi''an Center of Geological Survey, Xi''an 710054, China;MNR Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Xi''an Center of Geological Survey, Xi''an 710054, China,Research Center for Orogenic Geology, Xi''an Center of Geological Survey, Xi''an 710054, China;MNR Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Xi''an Center of Geological Survey, Xi''an 710054, China,Research Center for Orogenic Geology, Xi''an Center of Geological Survey, Xi''an 710054, China;MNR Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Xi''an Center of Geological Survey, Xi''an 710054, China,Research Center for Orogenic Geology, Xi''an Center of Geological Survey, Xi''an 710054, China;MNR Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Xi''an Center of Geological Survey, Xi''an 710054, China,Research Center for Orogenic Geology, Xi''an Center of Geological Survey, Xi''an 710054, China;MNR Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Xi''an Center of Geological Survey, Xi''an 710054, China,Research Center for Orogenic Geology, Xi''an Center of Geological Survey, Xi''an 710054, China;MNR Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Xi''an Center of Geological Survey, Xi''an 710054, China and Research Center for Orogenic Geology, Xi''an Center of Geological Survey, Xi''an 710054, China;MNR Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits, Xi''an Center of Geological Survey, Xi''an 710054, China |
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| Abstract: | |
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| Keywords: | U-Pb zircon dating geochemistry I-type granite back-arc basin North Qilian Gansu |
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