Identification of the ejecta deposit formed by the Australasian Tektite Event at Huai Om, northeastern Thailand
Identification of the ejecta deposit formed by the Australasian Tektite Event at Huai Om, northeastern Thailand
The Australasian Tektite Event, approximately 0.8 Ma, is the youngest record of a large impact event on Earth. Although it is estimated that it occurred somewhere in Indochina based on the distribution of tektites, the crater has never been located. Here, we report the discovery and occurrence of shocked quartz with planar deformation features (PDFs) in the Quaternary depositional sequence at Huai Om in northeastern Thailand. Measurements of the orientation of lamellae using a universal stage microscope as well as observation using scanning electron microscopy and transmission electron microscopy were conducted to confirm the presence of PDFs. Together with the occurrence of in situ layered tektite fragments, we identify the depositional sequence as the ejecta deposit formed by the Australasian Tektite Event. We further describe the detailed lithostratigraphy of the ejecta deposit, which will allow the tracing of its distribution and lateral changes in its thickness, grain size, and grain composition. Further investigation of the lateral distribution of the ejecta deposit would provide information about the location, magnitude, and target rocks of the Australasian Tektite Event.
1879-1901
Tada, Toshihiro
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Tada, Ryuji
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Carling, Paul
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Songtham, Wickanet
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Chansom, Praphas
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Kogure, Toshihiro
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Chang, Yu
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Tajika, Eiichi
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October 2022
Tada, Toshihiro
87d0f691-dd13-49cf-9702-af6357604f45
Tada, Ryuji
a478f3d4-6662-4956-b5b7-5612e200aa21
Carling, Paul
8d252dd9-3c88-4803-81cc-c2ec4c6fa687
Songtham, Wickanet
25bcad1d-d69b-4f53-b826-410048246acb
Chansom, Praphas
a119cdea-2c58-45af-84cc-ad044fe82b77
Kogure, Toshihiro
5316bb51-73be-4c36-bba0-c80438bcf4e7
Chang, Yu
88f512e4-9698-47dd-b5d2-3f418aa5d3cb
Tajika, Eiichi
5dcbf597-ef90-45c7-85f1-6822b5d015e7
Tada, Toshihiro, Tada, Ryuji, Carling, Paul, Songtham, Wickanet, Chansom, Praphas, Kogure, Toshihiro, Chang, Yu and Tajika, Eiichi
(2022)
Identification of the ejecta deposit formed by the Australasian Tektite Event at Huai Om, northeastern Thailand.
Meteoritics & Planetary Science, 57 (10), .
(doi:10.1111/maps.13908).
Abstract
The Australasian Tektite Event, approximately 0.8 Ma, is the youngest record of a large impact event on Earth. Although it is estimated that it occurred somewhere in Indochina based on the distribution of tektites, the crater has never been located. Here, we report the discovery and occurrence of shocked quartz with planar deformation features (PDFs) in the Quaternary depositional sequence at Huai Om in northeastern Thailand. Measurements of the orientation of lamellae using a universal stage microscope as well as observation using scanning electron microscopy and transmission electron microscopy were conducted to confirm the presence of PDFs. Together with the occurrence of in situ layered tektite fragments, we identify the depositional sequence as the ejecta deposit formed by the Australasian Tektite Event. We further describe the detailed lithostratigraphy of the ejecta deposit, which will allow the tracing of its distribution and lateral changes in its thickness, grain size, and grain composition. Further investigation of the lateral distribution of the ejecta deposit would provide information about the location, magnitude, and target rocks of the Australasian Tektite Event.
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Meteorit Planetary Scien - 2022 - Tada - Identification of the ejecta deposit formed by the Australasian Tektite Event at
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Accepted/In Press date: 25 July 2022
e-pub ahead of print date: 30 August 2022
Published date: October 2022
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The extensive comments by Dr. C. Koeberl significantly contributed to improving the manuscript. We also greatly thank Dr. C. Alwmark and the anonymous reviewer for their helpful comments on the previous versions of the manuscript, which greatly improved the manuscript. We are grateful to P. Jintasakul, the director of Khorat Fossil Museum, and P. Singhwachiraworakul for their hospitality during the field survey. We are much obliged to W. Tarora of the University of Tokyo who conducted the sample preparation with FIB for TEM observation. We are grateful to Dr. H. Ono and Dr. T. Arai of the Chiba Institute of Technology for their help during the SEM observations. We sincerely thank Dr. S. Takahashi, Dr. S. Muto, and K. Yoshizawa of the University of Tokyo, and Dr. K. Kurosawa of the Chiba Institute of Technology for valuable discussions. We also thank Dr. H. Tuffen for his kind help during T. Tada's visit to Lancaster University. This study was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI Fostering Joint International Research (B) 18KK0092 (2018‐2021) to R. Tada, and the Fujiwara Natural History Foundation Grant in 2016, Graduate Research Abroad Program (GRASP) 2019 of the University of Tokyo, and Grant‐in‐aid for JSPS Research Fellow Number 19J13252 awarded to T. Tada. P. A. Carling held a Leverhulme Emeritus Fellowship—2016–2018—which directly supported the project.
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© 2022 The Authors. Meteoritics & Planetary Science published by Wiley Periodicals LLC on behalf of The Meteoritical Society.
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Local EPrints ID: 470873
URI: http://eprints.soton.ac.uk/id/eprint/470873
ISSN: 1086-9379
PURE UUID: 0af99fea-524b-453a-9ed3-e2a1ab064c07
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Date deposited: 20 Oct 2022 16:43
Last modified: 16 Mar 2024 22:29
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Contributors
Author:
Toshihiro Tada
Author:
Ryuji Tada
Author:
Wickanet Songtham
Author:
Praphas Chansom
Author:
Toshihiro Kogure
Author:
Yu Chang
Author:
Eiichi Tajika
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