| 冀北单塔子群凤凰嘴杂岩的年代学研究 |
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| 引用本文： | 曲军峰,李锦轶,刘建峰.冀北单塔子群凤凰嘴杂岩的年代学研究[J].岩石学报,2012,28(9):2879-2889. |
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| 作者姓名： | 曲军峰 李锦轶 刘建峰 |
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| 作者单位： | 中国地质科学院地质研究所,北京,100037 |
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| 基金项目： | 本文受中国地质调查局地质调查工作项目(1212011085476); 国家自然科学基金(40872058)和地科院地质所所长基金联合资助 |
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| 摘 要： | 冀北地区基底的研究对理解华北克拉通早前寒武纪的演化具有重要意义。本文通过对冀北地区单塔子群凤凰嘴杂岩的锆石年代学工作探讨早前寒武纪华北克拉通北缘所经历的构造事件。单塔子群凤凰嘴杂岩主要由糜棱岩化的花岗质片麻岩和侵入其中的变质的基性岩墙组成。其中花岗质片麻岩的锆石呈明显的核边结构,岩浆核的谐和年龄为2.45Ga,变质边的年龄为1.95Ga。变质岩墙中的锆石未见明显的核边结构,阴极发光照片显示为变质锆石的特征,得到的年龄为1.9Ga。此年龄与花岗质片麻岩锆石的变质年龄相似,说明二者共同经历了古元古代的造山事件。此外,尽管没有得到岩墙的确切形成时代,但单塔子群内普遍发育的大规模岩墙说明在2.54～1.9Ga之间,该区经历了一次规模较大的伸展事件。
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| 关 键 词： | 锆石年代学 凤凰嘴 单塔子 冀北 |
| 收稿时间： | 2011/10/8 0:00:00 |
| 修稿时间： | 2012/2/27 0:00:00 |
Geochronological study on the Fenghuangzui complex of Dantazi Group at northern Hebei Province |
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| QU JunFeng,LI JinYi and LIU JianFeng.Geochronological study on the Fenghuangzui complex of Dantazi Group at northern Hebei Province[J].Acta Petrologica Sinica,2012,28(9):2879-2889. |
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| Authors: | QU JunFeng LI JinYi and LIU JianFeng |
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| Institution: | Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | The study of the basement of the northern Heibei Province plays an important role in understanding the Early Precambrian evolution of the North China Craton. In this paper, detailed geochronological study on Fenghuangzui complex of the Dantazi Group was reported, which indicate at least two tectonic events between Late Archean and Early Proterozoic. The Fenghuangzui complex of Dantazi Group, occupies the northern Hebei Province, is mainly composed of granitic mylonite gneiss and is intruded by metamorphic dyke. Zircons from the granitic mylonite gneiss show typical core-rim structure, and the age of magmatic core is 2.45Ga and the metamorphic rim 1.95Ga.However, zircons from the metamorphic dyke occur as only single grains and cathodoluminescence images constrain their metamorphic origin. Their concordant age of 1.9Ga, similar to metamorphic age of the granitic mylonite gneiss, indicate the granitic gneiss and the dyke underwent Paleoproterozoic orognic event together. Though the original age of the dyke is unknown, prominent Paleoproterozoic extension in the study area, occurred between 2.45~1.9Ga, can be deduced by existence of large-scale massive dykes. |
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| Keywords: | Zircon geochronology Fenghuangzui Dantazi Northern Hebei Province |
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