| 河北平泉光头山碱性花岗岩体的形成时代 |
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| 引用本文： | 韩宝福,洪大卫.河北平泉光头山碱性花岗岩体的形成时代[J].地质科学,1993,28(2):183-185. |
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| 作者姓名： | 韩宝福 洪大卫 |
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| 作者单位： | 1. 北京大学地质学系, 北京100871;2. 中国地质科学院岩石圈研究中心, 北京100037 |
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| 摘 要： | 光头山碱性花岗岩体位于河北省与内蒙古自治区交界处的平泉县北部,地理坐标为东经118°27′北纬41°17′。岩体出露面积约20km2,四周为太古代变质岩(图1)。岩石为灰白色中细粒花岗结构,含椭圆状、次圆状的细粒暗色包体,还有晚期的含碱性矿物的伟晶囊状体。主要造岩矿物有碱性长石、石英、钠铁闪石、霓辉石,副矿物主要有钠铁非石(Aenigmatite)、羟铁云母、硅铈铁矿、褐帘石、星叶石等。
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| 关 键 词： | Rb-Sr 等时线 时代 碱性花岗岩 平泉 河北省 |
| 收稿时间： | 1993-01-04 |
| 修稿时间： | 1993-01-04; |
AGE OF GUANGTOUSHAN ALKALI GRANITE, PINGQUAN, HEBEI PROVINCE, CHINA |
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| Han Baofu,Wang Shiguang.AGE OF GUANGTOUSHAN ALKALI GRANITE, PINGQUAN, HEBEI PROVINCE, CHINA[J].Chinese Journal of Geology,1993,28(2):183-185. |
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| Authors: | Han Baofu Wang Shiguang |
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| Institution: | 1. Department of Geology, Peking University, Beijing 100871;2. Lithosphere Research Center, Chinese Academy of Geological Sciences, Beijing 100037 |
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| Abstract: | The age of Guangtoushan Alkali granite, located at the northern part of Pingquan County, Hebei Province, has long been debated and was considered to be in either Archean, Proterozoic, or Yanshanian. The Rb-Sr isochron dating of whole rocks from the granite reveals its age of 194.0?4.9Ma, which is at the end of the Indosinian magmatism event (245-195Ma), and the initial ratio of 87Sr/86Sr is 0.7080. The dating is reliable because the dated samples have a large changes in their Rb/Sr ratios, the datapoints are distributed rationally and evenly in the isochron diagram, and the isochron has a high correlation coefficient. |
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| Keywords: | Rb-Sr isochron age Alkali granite Pingquan Hebei Province |
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