Volcanic eruptions in the Longgang volcanic field,northeastern China,during the past 15,000 years |
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| Authors: | Jiaqi Liu Guoqiang Chu Jingtai Han Patrick Rioual Weiyi Jiao Kaijun Wang |
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| Institution: | 1. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Huayuan Lu, P.O. Box 9825, Beijing 100029, China;2. Longwan National Natural Protection Bureau, Huinan County, P.O. Box 9825, Jilin Province 135102, China;1. Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China;2. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China;3. Department of Earth Sciences, Sun Yat-Sen University, Guangzhou, China;4. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China;5. Department of Earth Sciences, The University of Hong Kong, Hong Kong, China;6. University of Chinese Academy of Sciences, Beijing, China;1. MOE Key Laboratory of Western China''s Environmental System, Research School of Arid Environment and Climate Change, Lanzhou University, Lanzhou, 730000, China;2. Department of Geosciences, University of Arkansas, Fayetteville, AR, 72701, USA;1. Senckenberg Research Station of Quaternary Palaeontology Weimar, Am Jakobskirchhof 4, 99423 Weimar, Germany;2. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Telegrafenberg A43, 14473 Potsdam, Germany;3. Lower Saxony Institute for Historical Coastal Research, Viktoriastr. 26/28, 26382 Wilhelmshaven, Germany;4. Institute of Geological Sciences, Palaeontology Section, Free University Berlin, Malteserstr. 74–100, Haus D, 12249 Berlin, Germany;5. Institute of Geology and Geophysics Chinese Academy of Sciences, No. 19 Beitucheng West Road, Chaoyang District, Beijing 100029, China;6. GFZ German Research Centre for Geosciences, Section 5.2 – Climate Dynamics and Landscape Evolution, Telegrafenberg C109, 14473 Potsdam, Germany |
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| Abstract: | The Longgang volcanic field, located in northeastern China, is volcanically active with a number of eruptions during the Quaternary but the chronology of the eruptions is poorly defined. Some tephra layers are well preserved in the annually laminated sediments of maar lakes in the region, and facilitate the construction of a much improved chronological framework for the volcanic history of the area. The results of our investigations reveal that three basaltic explosive eruptions occurred at AD 460, 11460 cal yr BP and 14000 cal yr BP, respectively. The largest explosive basaltic eruption (AD 460) produced a thick black scoria layer in the Longgang volcanic field, including lakes. The tephra distribution and chronological data suggest that this eruption is likely to be from the Jinlongdingzi volcano. Two basaltic flood eruptions occurred at Jinlongdingzi. The earlier basaltic eruption produced a lava flow that spread over a forest and encased standing trees. Two radiocarbon ages obtained from charcoal samples collected from the burned remains of these trees are 1828–1989 cal yr BP and 2164–2359 cal yr BP. In the most recent stage of volcanism, the lava flow extended only ca. 2 km, and flowed into Lake Dalongwan. From the present status of the forest ecosystem, which has not yet reached the fully mature successional stage, we estimate that this lava is very young (ca. a few hundreds years old). Jinlongdingzi is a potentially dangerous volcano. Monitoring and assessment of the potential hazards in the Longgang volcanic field should be carried out in the future. |
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