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Sedimentary-volcanic tufts formed during the early Middle Triassic volcanic event in Guizhou Province and their stratigraphic significance
XIAO Jiafei; HU Ruizhong
2005
发表期刊Chinese Journal of Geochemistry
卷号24期号:4页码:338-344
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摘要The sedimentary-volcanic tuff (locally called "green-bean rock") formed during the early Middle Triassic volcanic event in Guizhou Province is characterized as being thin, stable, widespread, short in forming time and predominantly green in color. The green-bean rock is a perfect indicator for stratigraphic division. Its petrographic and geochemical features are unique, and it is composed mainly of glassy fragments and subordinately of crystal fragments and volcanic ash balls. Analysis of the major and trace elements and rare-earth elements ( REE), as well as the related diagrams, permits us to believe that the green-bean rock is acidic volcanic material of the calc-alkaline series formed in the Indosinian orogenic belt on the Sino-Vietnam border, which was atmospherically transported to the tectonically stable areas and then deposited as sedimentary-volcanic rocks there. According to the age of green-bean rock, it is deduced that the boundary age of the Middle-Lower Triassic overlain by the sedimentary-volcanic tuff is about 247 Ma.
关键词Volcanic Event
学科领域中国典型特殊区带大规模成矿作用及其动力学
资助者This work was supported by the Key Research 0rientation Project under the Knowledge-innovation Program, Chinese Academy of Sciences ( KZCX3-SW-125 ).
收录类别CSCD
语种英语
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文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/352002/549
专题矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文
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XIAO Jiafei,HU Ruizhong. Sedimentary-volcanic tufts formed during the early Middle Triassic volcanic event in Guizhou Province and their stratigraphic significance[J]. Chinese Journal of Geochemistry,2005,24(4):338-344.
APA XIAO Jiafei,&HU Ruizhong.(2005).Sedimentary-volcanic tufts formed during the early Middle Triassic volcanic event in Guizhou Province and their stratigraphic significance.Chinese Journal of Geochemistry,24(4),338-344.
MLA XIAO Jiafei,et al."Sedimentary-volcanic tufts formed during the early Middle Triassic volcanic event in Guizhou Province and their stratigraphic significance".Chinese Journal of Geochemistry 24.4(2005):338-344.
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