A DISCUSSION ON THE TYPE OF THE QIXIANGZHAN ERUPTION OF CHANGBAISHAN TIANCHI VOLCANO, NORTHEAST CHINA

doi:10.3969/j.issn.0253-4967.2013.03.008

Abstract

Abstract:

Changbaishan Tianchi volcano is one of the most dangerous active volcanoes in Northeast Asia. It experienced three periods of large-scale eruptions since the Holocene,i.e.the Tianwenfeng period at about 5,000 years ago,the Qixiangzhan period at about 4,000 years ago and the Millennium eruption at about 1,100 years ago,respectively. The type of Tianwenfeng and Millennium eruptions is commonly accepted to be a typical Plinian eruption. However,there arises a considerable debate about the type of Qixiangzhan eruption as whether it is effusive or explosive. In high-resolution remote-sensing images,the morphology of the products of Qixiangzhan eruption looks like a lava flow,which erupts from Qixiangzhan parasitic crater,and flows along the northern slope of the volcanic cone about 5.4km in length and 400～800m in width. However,the recent researches by the author have revealed that the Qixiangzhan eruption should be a small-scale pulsed explosive eruption. The main evidence is as follows: 1)The bulk-rock composition of Qixiangzhan eruption products is characterized by high SiO₂(≥71%)and Na₂O+K₂O(≥10%)contents representative of alkaline magma,which has high viscosity,low flowing ability and extremely high potential of explosive eruption; 2)Field observations show that the Qixinagzhan eruption products appear as thin layers about 2～5cm in thickness,the central part of which is welded stronger than the edge,significantly different from the massive or slaggy structures of lava flow. In addition,flame structures indicative of explosive eruption are well developed in the volcanic deposits around parasitic crater; 3)Microscopic observation reveals that most of the phenocrysts in the Qixiangzhan eruption products were severely broken by explosion to form angular grains with well developed micro-cracks. The vesicles in the Qixiangzhan eruption products are irregular in shape and have rough margin,different significantly from the elliptical and smooth margin vesicles commonly observed in lava flow; 4)Stereomicroscopic observation shows that the Qixiangzhan eruption products are composed of clastic particles and exhibit grain-supported texture with well developed irregular vesicles. Based on the above analyses,we may conclude that the Qixiangzhan eruption can be assigned to a small-scale pulsed explosive eruption. During the explosive eruption,a large number of fine pyroclastic particles flowed down the mountain slope as a high speed pyroclasstic flow to form thin layer of ignimbrite under the action of high temperature and strong shear forces. Over many times of explosive eruptions,layer upon layer of ignimbrite were accumulated,resulting in a shape just like lava flow. Therefore,all the three large eruptions of Changbaishan Tianchi volcano in Holocene can be assigned to explosive eruption,rather than the previously proposed model of explosive-effusive-explosive explosions.

Key words: the type of volcano eruption, Qixiangzhan eruption, explosive, effusive, ignimbrite

摘要：

全面系统地了解一座活火山的喷发特征与历史,对于预测其未来喷发形式及灾害性具有重要意义。长白山天池火山晚更新世或全新世以来存在3期大规模的喷发活动,天文峰期喷发与千年大喷发皆为典型的大规模的布里尼式爆炸喷发,而气象站期喷发方式却在爆炸式或溢流式的喷发类型上存在着激烈的争论。气象站期喷发物在遥感影像上表现为以气象站为寄生火口,向北流动长约5.4km,形貌上似一条熔岩流,但文中研究认为是小规模的脉冲式爆炸喷发而形成的岩层形态。主要依据为: 1)岩石成分为高黏度的酸性岩浆; 2)野外露头与剖面的薄层状堆积特征; 3)晶屑的棱角状破碎形态; 4)岩石的颗粒支撑结构。研究结果表明,气象站期的堆积物是爆炸喷发产生的碎屑物沿山坡以火山灰流的形式快速流动,在高温与高流速的剪切力作用下,火山灰流形成1套薄层状的熔结凝灰岩。因此,长白山天池火山晚更新世或全新世以来3期喷发活动均为爆炸式喷发,而非以前认为的爆炸—溢流—爆炸式喷发。

关键词: 火山喷发类型, 气象站期喷发, 爆炸式喷发, 溢流式喷发, 熔结凝灰岩

CLC Number:

P317.3

PAN Bo, FAN Qi-cheng, ZHONG Guang-pei, XU Jian-dong, WAN Yuan. A DISCUSSION ON THE TYPE OF THE QIXIANGZHAN ERUPTION OF CHANGBAISHAN TIANCHI VOLCANO, NORTHEAST CHINA[J]. SEISMOLOGY AND GEOLOGY, 2013, 35(3): 542-552.

潘波, 樊祺诚, 仲广培, 许建东, 万园. 长白山天池火山气象站期喷发类型研究[J]. 地震地质, 2013, 35(3): 542-552.

References

樊祺诚,刘若新,魏海泉,等.1999.长白山天池火山全新世喷发与岩石地球化学特征［J］.地质论评,45(7): 263—271.
FAN Qi-cheng,LIU Ruo-xin,WEI Hai-quan,et al.1999.Petrogeochemical characteristics of Holocene eruption of the Tianchi volcano,Changbai Mountains［J］.Geological Review,45(7): 263—271(in Chinese).
樊祺诚,隋建立,王团华,等.2007.长白山火山活动历史、岩浆演化与喷发机制探讨［J］.高校地质学报,13(2): 175—190.
FAN Qi-cheng,SUI Jian-li,WANG Tuan-hua,et al.2007.History of volcanic activity,magma evolution and eruptive mechanisms of the Changbai volcanic province［J］.Geological Journal of China Universities,13(2): 175—190(in Chinese).
高玲,上官志冠,魏海泉,等.2006.长白山天池火山近期气体地球化学的异常变化［J］.地震地质,28(3): 358—366.
GAO Ling,SHANGGUAN Zhi-guan,WEI Hai-quan,et al.2006.Recent geochemical changes of hot-spring gases from Tianchi volcano area,Changbai Mountains,Northeast China［J］.Seismology and Geology,28(3): 358—366(in Chinese).
季灵运,许建东,林旭东,等.2009.利用卫星热红外遥感技术监测长白山天池火山活动性［J］.地震地质,31(4): 617—627.
JI Ling-yun,XU Jian-dong,LIN Xu-dong,et al.2009.Application of satellite thermal infrared remote sensing in monitoring Changbaishan Tianchi volcano activity［J］.Seismology and Geology,31(4): 617—627(in Chinese).
金伯禄,张希友.1994.长白山天池火山地质研究［M］.长春: 东北朝鲜民族教育出版社.
JIN Bo-lu,ZHANG Xi-you.1994.Research on Volcanic Geology in Changbaishan Mountains［M］.Education Press of Northeast China Korean Minority,Changchun(in Chinese).
李霓,刘若新,魏海泉,等.1999.长白山天池火山近代喷发中气象站组熔岩-碎屑岩流研究［J］.地质论评,45(增刊): 272—277.
LI Ni,LIU Ruo-xin,WEI Hai-quan,et al.1999.Study of modern erupted lava-pyroclastic flow of Qixiangzhan formation of Tianchi volcano,Changbai Mountains［J］.Geological Review,45(suppl): 272—277(in Chinese).
刘嘉麒.1995.中国火山活动及潜在的危险性［A］.见: 刘若新主编. 火山活动与人类环境.北京: 地震出版社.
LIU Jia-qi.1995.Volcanism in China and its potential risk［A］.In: LIU Ruo-xin(ed).Volcanism and Human Environment. Seismological Press,Beijing(in Chinese).
刘嘉麒.1999.中国火山［M］.北京: 科学出版社.
LIU Jia-qi.1999.Volcanoes of China［M］.Science Press,Beijing(in Chinese).
刘强,盘晓东,魏海泉,等.2008.长白山天池火山喷发序列研究［J］.中国地震,24(3): 235—246.
LIU Qing,PAN Xiao-dong,WEI Hai-quan,et al.2008.A borehole study on the eruptive sequence from the Tianchi volcano,Changbai Mountain［J］.Earthquake Research in China,24(3): 235—246(in Chinese).
刘若新.2000.中国的活火山［M］.北京: 地震出版社.
LIU Ruo-xin.2000.Active Volcanoes in China［M］.Seismological Press,Beijing(in Chinese).
刘若新,李继泰,魏海泉,等.1992.长白山天池火山: 一座具潜在喷发危险的近代火山［J］.地球物理学报,35(5): 661—665.
LIU Ruo-xin,LI Ji-tai,WEI Hai-quan,et al.1992.Volcano at Tianchi Lake,Changbaishan Mountains: A modern volcano with potential danger of eruption［J］.Acta Geophysica Sinica,35(5): 661—665(in Chinese).
刘若新,魏海泉,汤吉,等.1996.长白山天池火山研究进展［J］.地震地磁观测与研究,17(6): 2—11.
LIU Ruo-xin,WEI Hai-quan,TANG Ji,et al.1996.Progress of the study on Tianchi volcano,Changbaishan,China［J］.Seismological and Geomagnetic Observation and Research,17(6): 2—11(in Chinese).
刘若新,魏海泉,李继泰,等.1998.长白山天池火山近代喷发［M］.北京: 科学出版社.
LIU Ruo-xin,WEI Hia-quan,LI Ji-tai,et al.1998.The Modern Eruption of Changbaishan Tianchi Volcano［M］.Science Press,Beijing(in Chinese).
刘祥,隋维国,向天元,等.2004.长白山天池地区全新世以来火山活动及其特征［J］.第四纪研究,24(6): 638—644.
LIU Xiang,SUI Wei-guo,XIANG Tian-yuan,et al.2004.Holocene volcanic activities and their features in Tianchi area,Changbaishan Mountains［J］.Quaternary Sciences,24(6): 638—644(in Chinese).
刘永顺,聂保锋,孙善平,等.2007.长白山天池火山气象站晚期碱流质熔岩的岩石学研究［J］.现代地质,21(2): 296—306.
LIU Yong-shun,NIE Bao-feng,SUN Shan-ping,et al.2007.Petrology of comenditic lava from the eruption at late Qixiangzhan Stage in Tianchi volcano,Changbaishan area［J］.Geoscience,21(2): 296—306(in Chinese).
聂保锋.2006.长白山天池火山气象站酸性熔岩流研究［D］:［学位论文］.北京: 首都师范大学.
NIE Bao-feng.2006.Study of Qixiangzhan silicic lava flow of Tianchi volcano in Changbaishan area［D］.Master degree thesis. Capital Normal University,Beijing(in Chinese).
潘波,许建东,林旭东,等.2011.基于热流变运动学模型的长白山熔岩流数值模拟［J］.地球物理学报,54(9): 2317—2324.
PAN Bo,XU Jian-dong,LIN Xu-dong,et al.2011.Modeling the lava flow of Changbaishan volcano,China based on kinematic thermo-rheological model［J］.Acta Geophysica Sinica,54(9): 2317—2324(in Chinese).
史延升.2007.长白山天池火山气象站期晚期碱流岩熔岩流的特征及其成因［D］:［学位论文］.北京: 首都师范大学.
SHI Yan-sheng.2007.The characteristics and genesis of comenditic lava from the eruption at late Qixiangzhan stage in Tianchi volcano,Changbaishan area［D］.Master degree thesis. Capital Normal University,Beijing(in Chinese).
孙春强,魏海泉,刘强,等.2008.长白山天池火山造锥粗面岩新的K-Ar年龄［J］.地震地质,30(2): 484—496.
SUN Chun-qiang,WEI Hai-quan,LIU Qiang,et al.2008.K-Ar dating on the trachytes composing the Tianchi composite cone in Changbaishan［J］.Seismology and Geology,30(2): 484—496(in Chinese).
徐夕生,邱检生.2010.火成岩岩石学［M］.北京: 科学出版社.
XU Xi-sheng,QIU Jian-sheng.2010.Igneous Petrology［M］.Science Press,Beijing(in Chinese).
尹功明,业渝光,万景林,等.1999.长白山地区近代火山岩的ESR测年研究［J］.地质论评,45(增): 287—293.
YIN Gong-ming,YE Yu-guang,WAN Jing-lin,et al.1999.Electron Spin Resonance(ESR)dating of recent volcanics from Changbai Mountains［J］.Geological Review,45(suppl): 287—293(in Chinese).
郑祥身.1983.长白山地区新生代火山岩的成因演化特征［A］.见: 中国科学院地质研究所1981届硕士论文集.北京: 北京科技出版社.256—267.
ZHENG Xiang-shen.1983.Petrogenesis and evolution characteristics of the Cenozoic rocks in Changbaishan Mountains［A］.In: Collections of Master Degree Theses of Institute of Geology,Chinese Academy of Sciences of 1981.Science and Technology Press,Beijing.256—267(in Chinese).
Csthryn G,Walter H,Ross L.2005.Altered Volcanic Rocks: A guide to description and interpretation［M］.The Centre for Ore Deposit Research,University of Tasmania,Australia.
Haraldur S,Bruce H,Hazel R,et al.1999.Encyclopedia of Volcanoes［M］.Academic Press,New York.
Liz P,Lionel W.2009.Fundamentals of Physical Volcanology［M］.John Wiley & Sons,USA.
McPhie J,Doyle M,Allen R.1993.Volcanic Textures: A guide to the interpretation of textures in volcanic rocks［M］.ARC Centre of Excellence in Ore Deposit,University of Tasmania,Australia.
Sumner J M,Rothery D A,Spiler O,et al.2007.Impact vesiculation-A new trigger for volcanic bubble growth and degassing［J］.Earth,2(4):151—167.
WEI Hai-quan,WANG Yu,JIN Jin-yu,et al.2007.Timescale and evolution of the intracontinental Tianchi volcanic shield and ignimbrite-forming eruption,Changbaishan,Northeast China［J］.Lithos,96: 315—324.
XU Jian-dong,LIU Guo-ming,WU Jian-ping,et al.2012.Recent unrest of Changbaishan volcano,Northeast China: A precursor of a future eruption?［J］.Geophysical Research Letters,39:L16305.