| K—Ar Geochronology and Evolution of Cenozoic Volcanic Rocks in Eastrn China |
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| 引用本文： | 王慧芬,杨学昌,等.K—Ar Geochronology and Evolution of Cenozoic Volcanic Rocks in Eastrn China[J].中国地球化学学报,1989,8(1):1-14. |
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| 作者姓名： | 王慧芬 杨学昌 等 |
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| 作者单位： | InstituteofGeochemistry,AcademiaSinica,Guiyang |
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| 摘 要： | Cenozoic volcanic rocks widespread in eastern China constitute an important part of the circum-Pacific volcanic belt.This paper presents more than 150K-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-eqisodic 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(1.2-0.5Ma) 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 youg.The above regularities are controlled by both global plate movement and regional inherent tectonic pattern.
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| 关 键 词： | 钾－氩地球年代学 新生代 火山岩 华东地区 板块运动 |
K-Ar geochronology and evolution of Cenozoic volcanic rocks in eastern China |
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| Wang Huifen,Yang Xuechang,Zhu Bingquan,Fan Sikun,Dai Tongmo.K-Ar geochronology and evolution of Cenozoic volcanic rocks in eastern China[J].Chinese Journal of Geochemistry,1989,8(1):1-14. |
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| Authors: | Wang Huifen Yang Xuechang Zhu Bingquan Fan Sikun Dai Tongmo |
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| Institution: | (1) Institute of Geochemistry, Academia Sinica, Guiyang |
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| Abstract: | 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. |
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