气候变化领域集成服务门户(CCPortal): Discovery of Daliuchong volcanic edifice in Tengchong, Yunnan Province and its significance

CCPortal

	Discovery of Daliuchong volcanic edifice in Tengchong, Yunnan Province and its significance
	Li Ni; Wei HaiQuan; Zhang LiuYi; Zhao YongWei; Zhao Bo; Chen ZhengQuan; Chen ShengSheng; Chen XiaoWen
通讯作者	Li, N (通讯作者)
发表日期	2014
ISSN	1000-0569
EISSN	2095-8927
起始页码	3627
结束页码	3634
卷号	30 期号:12
英文摘要	Situated adjacent to the border area of western Yunnan Province of China and Myanmar, Tengchong volcanic region has long been experiencing intense tectonic stress from the subduction of Indian plate to Eurasian plate and had strong volcanism as well as frequent earthquakes and geothermal activities in Cenozoic. Previous researches revealed that volcanism in Tengchong area started from Miocene, strengthened in Pliocene and prospered in Pleistocene. The volcanic activities tend to move from periphery to the middle of the region, as well as from north to the south. It is also famous Quaternary volcano group in our country. Strong hydrothermal activities still occur in the southern volcanic region, and helium emissions captured there were thought of from mantle source. Lying in a NS-stretched narrow basin, a series of well known Late Quaternary volcanoes as Heikongshan, Dayingshan and Ma' anshan and Early Pleistocene volcanoes of Daliuchong, Yujiadashan and Laifengshan are included in Tengchong volcano group. Volcanic activities in Tengchong basin relate to the subduction and collision of Indo-Eurasia plate, as a result, the volcanic rocks are a series of high alkali calcium-alkali rocks, locating above Mesa-Cenozoic intrusion rocks and Paleozoic deposits layer. Among them, Daliuchong volcano with the highest peak of 2763m is located in the middle of the basin. Lithology of Daliuchong volcano consists of huge amount of thick-layered explosive volcaniclastic deposits and few effusive dacitic lava in the summit area, forming multiple types of eruption products as vitric tuff, crystal tuff, lithic tuff etc., which covering more than 100km(2) in the volcanic region. The widely distributed layered volcaniclastic rocks of Daliuchong suggest a large scale explosive eruption once occurred in the region. A volcanic conduit with its diameter over one hundred meters, located about 100 meters south of its peak, was determined the first time through several seasonal field investigation works. It might be the primary eruption conduit in the Early Pleistocene eruption episodes in Tengchong area. Daliuchong volcanic plug could also be seen in the google satellite image. None of the conduit had been found and mentioned before through much previous study works conducted in this area. The lava dome in the summit was broken into rock blocks, and volcanic breccia could be seen in the hillside of the proximal facies of volcanic eruption products, while dacitic volcanic plug rocks ascended and blocked up in the conduit, with vertical conduit boundries controlled by inner layer joints paralleling to the plug body rim. Several dikes could also be found near the main peak and other peaks about 2km southwest of the main peak, whereas one dacitic dike exhibits horizontal columnar cleavages in the main peak. Pseudoflow structure, parallel bedding structure, eutaxitic structure form the distinctive features in the Daliuchong volcanic tuffs. Volcanic plug, lava dome, volcanic dikes, explosive and effusive eruption products together formed the whole volcanic edifice of Daliuchong, and some rock collapse and landslide deposits due to cracks of the hillside were also investigated around the upper part of the volcano during the field works. Daliuchong edifice and its landslide deposits not only account for the source of widely distributed volcaniclastic rocks in Tengchong volcanic area, but also provide the ideal sample site for the prevention of secondary geological disaster which might be triggered by eruptions of almost the same large scale in the future and give an early warning for the approaching volcanic disaster as well.
关键词	WEST YUNNAN CHINA AREA MAGMA ROCKS GEOCHEMISTRY ERUPTION ORIGIN FIELD
英文关键词	Daliuchong; Volcanic edifice; Volcaniclastic deposits; Volcanic cluster; Tengchong; Yunnan Province
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000347270400012
来源期刊	ACTA PETROLOGICA SINICA
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258296
推荐引用方式 GB/T 7714	Li Ni,Wei HaiQuan,Zhang LiuYi,et al. Discovery of Daliuchong volcanic edifice in Tengchong, Yunnan Province and its significance[J]. 中国科学院青藏高原研究所,2014,30(12).
APA	Li Ni.,Wei HaiQuan.,Zhang LiuYi.,Zhao YongWei.,Zhao Bo.,...&Chen XiaoWen.(2014).Discovery of Daliuchong volcanic edifice in Tengchong, Yunnan Province and its significance.ACTA PETROLOGICA SINICA,30(12).
MLA	Li Ni,et al."Discovery of Daliuchong volcanic edifice in Tengchong, Yunnan Province and its significance".ACTA PETROLOGICA SINICA 30.12(2014).