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

convener:Ryuji Tada(Department of Earth and Planetary Science, Graduate School of Science, The Univeristy of Tokyo), 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.

+Add all to schedule

[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

*Kosuke Kurosawa¹, Ryota Moriwaki¹, Kojiro Suzuki², Takafumi Matsui¹ (1.Planetary Exploration Research Center, Chiba Institute of Technology, 2.Department of Advanced Energy, Graduate School of Frontier Sciences, The University of Tokyo)

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

*Yu Chang¹, Masahiro KAYAMA², Eiichi Tajika¹, Yasuhito Sekine³, Toshimori Sekine⁴, Hirotsugu nishido⁵, Takamichi Kobayashi⁶ (1.Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 2.Department of General Systems Studies, Graduate School of Arts and Sciences, The University of Tokyo, 3.Earth-Life Science Insitute, Tokyo Institute of Technology, 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

*Toshihiro Tada¹, Masahiro KAYAMA², Yu Chang¹, Akira Miyake³, Yohei Igami⁴, Ryuji Tada^1,5,6, Paul A Carling⁷, Wickanet Songtham⁸, Eiichi Tajika¹ (1.Department of Earth and Planetary Science, The University of Tokyo , 2.Department of Multi-Disciplinary Sciences, The University of Tokyo , 3.Division of Earth and Planetary Sciences, Kyoto University , 4.Institute of Materials and Systems for Sustainability, Nagoya University, 5. Planetary Exploration Research Center, Chiba Institute of Technology, 6.Research Center for Earth System Science, Yunnan University, 7.Geography and Environmental Science, University of Southampton, 8. Northeastern Research Institute of Petrified Wood & Mineral Resources, Nakhon Ratchasima Rajabhat University)

[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

*Song Lu¹, Youhei Yamashita², Tomohisa Irino², Toshihiro Tada³, Ryuji Tada³ (1.Graduate School of Environmental Science, Hokkaido University , 2.Faculty of Environmental Earth Science, Hokkaido University, 3.Department of Earth and Planetary Science , Graduate School of Science, The University, of Tokyo)

[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)