[M-IS04] An asteroid impact in SE Asia at 0.8 Ma and its effect on the environment and biota

コンビーナ:多田隆治(東京大学大学院理学系研究科地球惑星科学専攻)、Paul A Carling(University of Southampton)、Wickanet Songtham(Nakhon Ratchasima Rajabhat University, Thailand )、Kerry Sieh(Nanyang Technological University)

The impact of a small celestial body in Indochina Peninsula at 0.79 Ma, known as Australasia Tektite event (AATE), has been known for more than half a century due to the wide-spread distribution of tektite. Yet, the source crater of the tektite is not yet found inspite of the probable large size (>30 km in diameter) of crater, its relatively young age, and intensive search by many researchers. However, the situation is changing rapidly during the last several years and the area for the location of the crater is gradually narrowed down. Also, the evidence of environmental perturbation and possible relation with local extinction and migration of hominid and animals has been suggested recently.
In addition, because its timing is close to the Matsuyama/Brunhes paleomagnetic reversal event and in the middle of glacial lowstand during MIS 20, precise age of AATE and its relation with glacio-eustatic sea level changes should have a significant implication to Quaternary chronostratigraphy.
For these reasons, we propose a special interdisciplinary session on the location, mode, magnitude, and exact timing of the AATE impact and its possible effect on the environment and biota
The topic should be of major interest to geologists, sedimentologists, planetary scientists, paleontologists, paleoclimatologists, anthropologists, and so on, especially to those working in SE Asia. Thus adequate topic for JpGU-AGU joint meeting.

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[MIS04-P01] Discovery of Australasian microtektites in the hemipelagic sediments of the Japan Sea: It’s significance and implications

*Ryuji Tada^1,2,3、Toshihiro Tada³、Jumpei Yoshioka⁴ (1.Geo-Cosmology Center, Chiba Institute of Technology、2.Research Center for Earth System Science, Yunnan University、3.Department of Earth and Planetary Science, the Univeristy of Tokyo、4.Atmospheric and Ocean Research Institute, the University of Tokyo)

[MIS04-P02] Ejection behavior after hypervelocity oblique impacts in an atmosphere

*黒澤耕介¹、森脇涼太¹、鈴木宏二郎²、松井孝典¹ (1.千葉工業大学　惑星探査研究センター、2.東京大学大学院新領域創成科学研究科先端エネルギー工学専攻)

[MIS04-P03] Shock-induced vitrification affected on cathodoluminescence of quartz: possibility as a shock barometer and its potential application to natural impact samples

*常ユイ¹、鹿山雅裕²、田近英一¹、関根康人³、関根利守⁴、西戸裕嗣⁵、小林敬道⁶ (1.東京大学大学院理学系研究科地球惑星科学専攻、2.東京大学大学院総合文化研究科広域科学専攻広域システム科学系、3.東京工業大学地球生命研究所、4.Center for High Pressure Science and Technology Advanced Research、5.Research Institute of Natural Science, Okayama University of Science、6.National Institute for Materials Science)

[MIS04-P04] Evaluation of shock deformation of the basement sandstone around the probable impact site of Australasian Tektite Event using synchrotron X-ray diffraction analysis

★Invited Papers

*多田賢弘¹、鹿山雅裕²、常ユイ¹、三宅亮³、伊神洋平⁴、多田隆治^1,5,6、Carling Paul⁷、Songtham Wickanet⁸、田近英一¹ (1.東京大学大学院理学系研究科地球惑星科学専攻、2.東京大学大学院総合文化研究科広域科学専攻、3.京都大学大学院理学研究科地球惑星科学専攻、4.名古屋大学未来材料・システム研究所高度計測技術実践センター、5.千葉工業大学惑星探査センター、6.雲南大学地球系統科学中心、7.サウサンプトン大学、8.ナコンラチャシマラジャハト大学)

[MIS04-P05] Quaternary stratigraphy and occurrence of the Australasian tektites in Thailand, Laos PDR, and Cambodia: implication of the impact location

*Wickanet Songtham¹、Ryuji Tada²、Paul A Carling³、Toshihiro Tada²、Praphas Chansom¹ (1.Nakhon Ratchasima Rajabhat University, Thailand 、2.The University of Tokyo, Japan、3.The University of Southampton, United Kingdom)

[MIS04-P06] Assessment for BPCA method as biomass burning proxies and their application to meteorite impact event

*芦松¹、山下洋平²、入野智久²、多田賢弘³、多田隆治³ (1.北海道大学大学院環境科学院、2.北海道大学大学院地球環境科学研究院、3.東京大学大学院理学系研究科地球惑星科学専攻)

[MIS04-P07] Converging lines of evidence for burial of the Australasian impact crater within the Bolaven volcanic field, Southern Laos

*Kerry Sieh¹、Jason Herrin¹、Dayana Schonwalder Angel¹、Vanpheng Sihavong²、Brian Jicha³、Brad Singer³、Weerachat Wiwegwin⁴、James Daniel Paul Moore¹、Paramesh Banerjee¹、Tawachai Chualaowanich⁴、Punya Charusiri⁵ (1.Earth Observatory of Singapore, Nanyang Technological University, 639798 Singapore、2.Department of Geology and Mines, Ministry of Energy and Mines, Vientiane, Lao People’s Democratic Republic、3.Department of Geoscience, University of Wisconsin–Madison, Madison, WI 53706、4.Department of Mineral Resources, Ministry of Natural Resources and Environment, Ratchatewi, 10400 Bangkok, Thailand、5.Department of Geology, Chulalongkorn University, Khet Pathumwan, 10330 Bangkok, Thailand)