| 辽河盆地东部凹陷新生代火山岩K-Ar地质年代学及其地质意义 |
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| 引用本文： | 杨默函,侯贵廷,史謌.辽河盆地东部凹陷新生代火山岩K-Ar地质年代学及其地质意义[J].北京大学学报(自然科学版),2006,42(2):184-191. |
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| 作者姓名： | 杨默函 侯贵廷 史謌 |
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| 作者单位： | 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;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;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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| 摘 要： | 辽河盆地是中、新生代发育起来的裂谷盆地,东部凹陷是辽河盆地新生代火山活动最为频繁的地区,发育大量火山岩.通过对东部凹陷测得的28个火山岩样品K-Ar年龄数据,结合区域火山岩石学、地球化学研究结果,对比前人曾发表的K-Ar年龄数据,将本区新生代火山活动分为房身泡、沙三、沙一和东营4个时期,始于65 Ma,并在42～38 Ma和32～25 Ma经历2个活动高峰期.这为渤海湾盆地新生代构造演化乃至中国东部新生代裂谷活动研究,增加了同位素年代学方面的有力证据.
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| 关 键 词： | 火山岩 K-Ar定年 新生代 东部凹陷 辽河盆地 |
| 收稿时间： | 2004-08-31 |
| 修稿时间： | 2004-08-312006-01-07 |
K-Ar Geochronology of Cenozoic Volcanic Rocks of East Depression in Liaohe Basin and Its Geological Significance |
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| YANG Mohan,HOU Guiting,SHI Ge.K-Ar Geochronology of Cenozoic Volcanic Rocks of East Depression in Liaohe Basin and Its Geological Significance[J].Acta Scientiarum Naturalium Universitatis Pekinensis,2006,42(2):184-191. |
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| Authors: | YANG Mohan HOU Guiting SHI Ge |
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| Institution: | The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing, 100871 |
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| Abstract: | Liaohe basin is a Cenozoic rift valley with numerous volcanic activities developed in East Depression. Based on the large amount of K-Ar geochronology, petrology and geochemistry data, the Cenozoic volcanic activities in this depression are divided into 4 periods, which are Fangshenpao, Shasan, Shayi and Dongying periods. The Shasan and Dongying periods are two summits of volcanic activities, with accurate isotopic age of 43 - 38 Ma and 32 - 25 Ma respectively. This paper provides an accurate isotopic chronology constraints for the study of Cenozoic tectonic evolution of Bohai basin and Eastern China. |
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| Keywords: | volcanic rocks K-At dating Cenozoic east depression Liaohe basin |
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