K-Ar geochronology and evolution of Cenozoic volcanic rocks in eastern China
K-Ar geochronology and evolution of Cenozoic volcanic rocks in eastern China
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DOI：
10.1007/bf02842210
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
Wang Huifen;Yang Xuechang;Zhu Bingquan;Fan Sikun;Dai Tongmo
中科院分区：
文献类型：
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作者：
Wang Huifen;Yang Xuechang;Zhu Bingquan;Fan Sikun;Dai Tongmo
广泛分布于中国东部的新生代火山岩是环太平洋火山带的重要组成部分。本文介绍了分布在腾冲、中国东南沿海、山东、河北、内蒙古和东北地区的新生代火山岩的150多个K-Ar年代和大量的石油化学分析资料。综合研究表明，早近纪至全新世，火山活动普遍存在，但不均匀，具有多期、多旋回的特征。古新世（67 ~ 58ma）、始新世（57 ~ 37.5Ma）、中新世（22 ~ 18,16 ~ 19ma）、上新世（8 ~ 3ma）、早更新世—中更新世（1.2 ~ 0.5 Ma）为火山活动的高潮期，渐新世为火山活动的休止期。在空间上，古近系火山岩主要分布在区域内或ne - nne向断陷中部，较年轻的新近系和第四纪火山岩主要分布在东部和西部。岩石学上主要属于拉斑玄武岩系列和碱性玄武岩系列，岩石的碱度从古到新逐渐增加。上述规律受全球板块运动和区域固有构造格局的双重控制。
Cenozoic volcanic rocks widespread in eastern China constitute an important part of the circum-Pacific volcanic belt.This paper presents more than 150 K-Ar dates and a great deal of petrochemical analysis data from the Cenozoic volcanic rocks distributed in Tengchong, China’s southeast coast, Shandong, Hebei, Nei Monggol and Northeast China. An integrated study shows that ubiquitous but uneven volcanic activities prevailed from the Eogene to the Holocene, characterized as being multi-episodic and multicycled. For example, in the Paleocene (67-58Ma), Eocene (57-37.5Ma), Miocene (22-18, 16-19Ma), Pliocene (8-3Ma), and Early Pleistocene-Middle Pleistocene (1.2-0.5 Ma) there were upsurges of volcanism, while in the Oligocene there was a repose period. In space, the older Eogene volcanic rocks are distributed within the region or in the central part of the NE-NNE-striking fault depression, while the younger Neogene and Quaternary volcanic rocks are distributed in the eastern and western parts. Petrologically, they belong essentially to tholeiite-series and alkali-series basalts, with alkalinity in the rocks increasing from old to young.The above regularities are controlled by both global plate movement and regional inherent tectonic pattern.