| 太原西山上二叠统—下三叠统地层最大沉积年龄的碎屑锆石U Pb定年约束 |
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| 引用本文： | 刘超,孙蓓蕾,曾凡桂.太原西山上二叠统—下三叠统地层最大沉积年龄的碎屑锆石U Pb定年约束[J].地质学报,2014,88(8):1579-1587. |
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| 作者姓名： | 刘超 孙蓓蕾 曾凡桂 |
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| 作者单位： | 太原理工大学地球科学与工程系，太原，030024;太原理工大学地球科学与工程系，太原，030024;太原理工大学地球科学与工程系，太原，030024 |
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| 基金项目： | 国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 摘 要： | 二叠纪—三叠纪之交是古生界向中生界过渡的重要地质历史转折时期,发生了地史时期规模最大的生物灭绝事件。石千峰组作为华北地台二叠系—三叠系过渡阶段沉积,其时代归属对二叠系—三叠系界线的准确划分至关重要。本文应用LA-MC-ICPMS对华北中部太原西山晚二叠世—早三叠世上石盒子组、石千峰组、刘家沟组中4件砂岩样品进行碎屑锆石U-Pb定年,4件砂岩样品(SNF、XM、K8、LJG)分别给出了最年轻锆石峰值年龄270Ma、296Ma、250Ma、262Ma,表明太原西山上石盒子组师脑峰砂岩(SNF)的沉积时间不早于270Ma,石千峰组底部K8砂岩(K8)沉积时间不早于250Ma。因此,太原西山地区石千峰组应归属于早三叠世,二叠系—三叠系的界线应位于石千峰组K8砂岩之下。
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| 关 键 词： | 太原西山 石千峰组 砂岩碎屑锆石 U-Pb定年 二叠系—三叠系 |
| 收稿时间： | 2013/12/17 0:00:00 |
| 修稿时间： | 2014/2/19 0:00:00 |
Constraints on U Pb Dating of Detrital Zircon of the Maximum Depositional Age for Upper Permian to Lower Triassic Strata in Xishan, Taiyuan |
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| liuchao,sunbeilei and zengfangui.Constraints on U Pb Dating of Detrital Zircon of the Maximum Depositional Age for Upper Permian to Lower Triassic Strata in Xishan, Taiyuan[J].Acta Geologica Sinica,2014,88(8):1579-1587. |
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| Authors: | liuchao sunbeilei and zengfangui |
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| Institution: | Taiyuan University of Tecnology,Taiyuan University of Tecnology,Taiyuan University of Tecnology |
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| Abstract: | Permian to Triassicis an important turning point of geological history during the transition period of Paleozoic to Mesozoic, in which the largest mass extinction events in geological history happened. As the transition stage of Permian to Triassic, the era of Shiqianfeng Formation is crucial to define the boundary of Permian to Triassic. In order to determine the era of Shiqianfeng Formation in Xishan, Taiyuan, North China, the laser ablation multi collector inductively coupled plasma mass spectrometry (LA MC ICPMS) was applied to date the U Pb age of detrital zircon. Four sandstone samples (SNF, XM, K8, LJG) from the marker layers of strata division and correlation from the Xiashihezi Formation, Shiqianfeng Formation and Liujiagou Formation were analyzed. Four sandstone samples SNF, XM, K8, LJG obtained youngest graphical detrital zircon age were 270 Ma, 296 Ma, 250 Ma, 262 Ma, respectively. The results show that the deposition time of Shinaofeng sandstone(SNF) was not earlier than 270Ma, the deposition time of K8 sandstone(K8) was not earlier than 250Ma. Therefore, Shiqianfeng Formation of Xishan, Taiyuan should belong to the Lower Triassic, and the boundary of Permian to Triassic lied under the K8 sandstone. Symbol`@@ |
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| Keywords: | Xishan Taiyuan Shiqianfeng Formation sandstone detrital zircon U Pb dating Permian Triassic |
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