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
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泰国东北部怀奥姆澳大利亚玻璃陨石事件形成的喷射物沉积物的鉴定

DOI:
10.1111/maps.13908
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发表时间:
2022
期刊:
Meteoritics & Planetary Science
影响因子:
--
通讯作者:
Tajika Eiichi
Tajika Eiichi
中科院分区:
--
文献类型:
--
作者:
Tada Toshihiro;Tada Ryuji;Carling Paul A.;Songtham Wickanet;Chansom Praphas;Kogure Toshihiro;Chang Yu;Tajika Eiichi

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大约0.8 Ma的澳大拉西亚陨石事件是地球上最年轻的大型撞击事件记录。虽然根据玻陨石的分布估计它发生在印度支那的某个地方,但火山口从未被定位。在这里,我们报告的发现和发生的冲击石英与平面变形功能(PDF)的第四纪沉积序列在怀Om在泰国东北部。使用通用载物台显微镜测量薄片的取向以及使用扫描电子显微镜和透射电子显微镜进行观察以确认PDF的存在。结合原地层状玻璃陨石碎片的出现,我们确定该沉积序列为澳大拉西亚玻璃陨石事件形成的喷出物存款。我们进一步描述了喷出物存款,这将使其分布和横向变化的厚度,粒度和颗粒成分的跟踪详细的岩石地层学。喷出物存款的横向分布的进一步调查将提供有关的位置,规模和目标岩石的澳大拉西亚玻璃陨石事件的信息。
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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