K-Ar Geochronology of Cenozoic Volcanic Rocks of East Depression in Liaohe Basin and Its Geological Significance

Abstract

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 43~38Ma and 32~25Ma respectively. This paper provides an accurate isotopic chronology constraints for the study of Cenozoic tectonic evolution of Bohai basin and Eastern China.

Key words: volcanic rocks, K-Ar dating, Cenozoic, east depression, Liaohe basin

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65Ma，并在42～38Ma和32～25Ma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。

关键词: 火山岩, K-Ar定年, 新生代, 东部凹陷, 辽河盆地

CLC Number:

P534.6

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.

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）.

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URL: https://xbna.pku.edu.cn/EN/

https://xbna.pku.edu.cn/EN/Y2006/V42/I2/184

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K-Ar Geochronology of Cenozoic Volcanic Rocks of East Depression in Liaohe Basin and Its Geological Significance

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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