JpGU-AGU Joint Meeting 2020

Session information

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[E] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[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.

Introduction (4:00 PM - 4:05 PM)

[MIS04-01] Converging lines of evidence for burial of the Australasian impact crater within the Bolaven volcanic field, Southern Laos

★Invited Papers

Kerry Sieh1, *Jason S Herrin1, Dayana Angel Schonwalder1, Vanpheng Sihavong2, Brian Jicha3, Brad Singer3, Weerachat Wewegwin4, Paramesh Banerjee1, Tawachai Chualaowanich4, Punya Charusiri5 (1.Earth Observatory of Singapore, Nanyang Technological University, 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, Wisconsin, USA, 4.Department of Mineral Resources, Ministry of Natural Resources and Environment, Ratchatewi, Bangkok, Thailand, 5.Department of Geology, Chulalongkorn University, Khet Pathumwan, Bangkok, Thailand)

[MIS04-02] A terrestrial mafic component in Australasian tektites and associated strata; Geochemical record of the Bolaven impact.

*Jason S Herrin1, Dayana Schonwalder1, Kerry Sieh1, James D. P. Moore1, Tawatchi Chualaowanich2, Brian Jicha3, Brad Singer3, Vanpheng Sihavong4, Weerachat Wiwegwin5, Punya Charusiri5 (1.Earth Observatory of Singapore, Nanyang Technological University, 639798 Singapore, 2.Department of Mineral Resources, Ministry of Natural Resources and Environment, Ratchatewi, 10400 Bangkok, Thailand, 3.Department of Geoscience, University of Wisconsin–Madison, Madison, WI 53706, 4.Department of Geology and Mines, Ministry of Energy and Mines, Vientiane, Lao People’s Democratic Republic, 5.Department of Geology, Chulalongkorn University, Khet Pathumwan, 10330 Bangkok, Thailand)

[MIS04-03] Identification of Ejecta Deposit formed by Australasian Tektite Event based on Discovery of Shocked Quartz and in situ Tektite Fragments in North Eastern Thailand

*Toshihiro Tada1, Ryuji Tada1,2,3, Paul Carling4, Wickanet Songtham5, Praphas Chansom5, Toshihiro Kogure1, Yu Chang1, Eiichi Tajika1 (1.Department of Earth and Planetary Science, The University of Tokyo , 2.Planetary Exploration Research Center, Chiba Institute of Technology, 3.Research Center for Earth System Science, Yunnan University, 4.Geography and Environmental Science, University of Southampton, 5.Northeastern Research Institute of Petrified Wood & Mineral Resources, Nakhon Ratchasima Rajabhat University)

[MIS04-04] Regionally-extensive ejecta layer of the Australian tektite strewn-field: the MIS 20 large meteorite impact in Indochina

*Paul A Carling1,2, Toshihiro Tada3, Ryuji Tada3,4, Wickanet Songtham5, Alan Cresswell6, David Sanderson6, Naomi Porat7, Jaroon Duangkrayom5, Luba Meshkova2, Ian Croudace2, Stephen Darby2, Xuanmei Fan1 (1.Chengdu University of Technology, 2.University of Southampton, 3.Chiba Institute of Technology, 4.Yunnan University, 5.Nakhon Ratchasima Rajabhat University, 6.Scottish Universities Environmental Research Centre, 7.Geological Survey of Israel)