| 内蒙古科尔沁右翼前旗哈拉黑地区地层锆石U-Pb年代学研究及其地质意义 |
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| 引用本文： | 申亮,刘永江,温泉波,李伟民,冯志强.内蒙古科尔沁右翼前旗哈拉黑地区地层锆石U-Pb年代学研究及其地质意义[J].地质科学,2016,0(1):220-238. |
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| 作者姓名： | 申亮 刘永江 温泉波 李伟民 冯志强 |
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| 作者单位： | 吉林大学地球科学学院 长春 130061 |
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| 摘 要： | 对大兴安岭中南段内蒙古科尔沁右翼前旗哈拉黑地区原定二叠系林西组和侏罗系白音高老组的样品分别进行了锆石LA-ICP-MS U-Pb同位素测年,获得林西组的282 Ma和317 Ma两组峰值年龄以及白音高老组134 Ma、242 Ma和284 Ma的3组峰值年龄,说明原定白音高老组地层并非属于侏罗纪,而应该属于白垩纪。根据锆石结构特点推测林西组地层物源可能主要来自该区晚泥盆世-早石炭世岩浆弧产物和下二叠统大石寨组火山沉积。综合区域资料研究认为,内蒙古东部大兴安岭地区可能曾经发育有三叠纪沉积,现今大面积的缺失是由于后期构造抬升剥蚀所致。
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| 关 键 词： | 锆石LA-ICP-MS U-Pb测年 三叠纪 林西组 白音高老组 大兴安岭中南段 |
| 收稿时间： | 2015-05-12 |
| 修稿时间： | 2015-05-12; |
Zircon U-Pb Geochronology and its geological significance in Halahei area,Horqin Right Front Banner of Inner Mongolia |
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| Shen Liang,Liu Yongjiang,Wen Quanbo,Li Weimin,Feng Zhiqiang.Zircon U-Pb Geochronology and its geological significance in Halahei area,Horqin Right Front Banner of Inner Mongolia[J].Chinese Journal of Geology,2016,0(1):220-238. |
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| Authors: | Shen Liang Liu Yongjiang Wen Quanbo Li Weimin Feng Zhiqiang |
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| Institution: | College of Earth Sciences, Jilin University, Changchun 130061 |
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| Abstract: | The Halahei stratigraphic cross-section, that is previously identified as Permian Linxi Formation and Jurassic Baiyingaolao Formation, located in the Horqin Right Front Banner, Inner Mongolia, central and southern Great Xing'an Range, has been geochronologically investigated using zircon LA-ICP-MS U-Pb dating in this study. The results presented here show the peak ages of 282 Ma, 317 Ma and 134 Ma, 242 Ma, 284 Ma for the Linxi Formation and the Baiyingaolao Formation, respectively. These data illustrates that the Baiyingaolao Formation should belong to the Cretaceous rather than the Jurassic as previously regarded. Moreover, according to the fabric of zircons analyzed, the provenance of the Linxi Formation might derived from the volcanic rock sedimentation by magmatic arc during Late Devonian to Early Carboniferous and Early Permian Dashizhai Formation volcanic rock sedimentation. This research also reveals that the absences of the Triassic strata in eastern Great Xing'an Range is ascribed to the ablation of structural uplift afterwards. |
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| Keywords: | Zircon LA-ICP-MS U-Pb age Triassic Linxi Formation Baiyingaolao Formation Central and southern Great Xing'an Range |
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