| 琼北火山岩激光40Ar/39Ar定年研究 |
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| 引用本文： | 洒骁,季建清,周晶.琼北火山岩激光40Ar/39Ar定年研究[J].岩石学报,2013,29(8):2789-2795. |
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| 作者姓名： | 洒骁 季建清 周晶 |
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| 作者单位： | 1. 北京大学地球与空间科学学院造山带与地壳演化教育部重点实验室,北京100871;中国地质大学,北京100083
2. 北京大学地球与空间科学学院造山带与地壳演化教育部重点实验室,北京,100871 |
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| 基金项目： | 本文受中国地质调查局地质调查项目(12120113013700)资助. |
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| 摘 要： | 新生代以来,雷琼地区多次、大量地喷发了一系列火山岩。前人主要基于K-Ar法对此划分了期次。本文采用激光40Ar/39Ar年代学方法,对琼北火山岩区进行了精细定年研究。低本底激光40Ar/39Ar法能够对低钾含量,极少量样品(毫克级)进行精细测定,非常适合极年轻火山岩的定年工作。结果显示的火山岩激光40Ar/39Ar法高质量数据表明琼北火山喷发活动时限跨越1.3～0.052Ma。在比较了表观年龄与等时线年龄差异之后,本文给出了年龄推荐值。正如测试数据所显示,本地区新生代火山岩普遍存在40Ar和36Ar过剩的问题,此时只有等时线年龄才代表喷发的真实年龄。
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| 关 键 词： | 40Ar/39Ar年代学 琼北火山岩 Ar丢失与过剩 |
| 收稿时间： | 2012/11/21 0:00:00 |
| 修稿时间： | 2013/2/26 0:00:00 |
High-precision Laser 40Ar/39Ar dating of Qiongbei volcanic rocks |
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| SA Xiao,JI JianQing and ZHOU Jing.High-precision Laser 40Ar/39Ar dating of Qiongbei volcanic rocks[J].Acta Petrologica Sinica,2013,29(8):2789-2795. |
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| Authors: | SA Xiao JI JianQing and ZHOU Jing |
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| Institution: | Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871, China;China University of Geosciences, Beijing 100083, China;Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, Peking University, Beijing 100871, China |
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| Abstract: | Since Late Cenozoic era, volcanic rocks have been frequently and massively erupted in the Leiqiong area. Those volcanic rocks, on the basis of K-Ar dating method, are divided to several volcanic phases. In this paper, laser 40Ar/39Ar dating method is used to test and calculate the accurate time of volcanic rocks in Qiongbei area. The high quality data result by laser 40Ar/39Ar dating method shows that the time spans of eruption of Qiongbei volcanoes are around 1.3~0.052Ma. Considering the differences between the apparent ages and the isochron ages, a series of ages are recommended. As shown as the data, there are widespread inherited 40Ar* and 36Ar excess in the Cenozoic volcanic rocks, then the isochorn ages are more recommended to be the real ages of the eruptions. |
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| Keywords: | 40Ar/39Ar Dating Qiongbei volcanic rocks Inherited 40Ar |
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