JpGU-AGU Joint Meeting 2017

Presentation information

[EE] Oral

B (Biogeosciences) » B-CG Complex & General

[B-CG07] [EE] Earth and Planetary Science Frontiers for Life and Global Environment

Mon. May 22, 2017 10:45 AM - 12:15 PM 201B (International Conference Hall 2F)

convener:Yoshinori Takano(Japan Agency for Marine-Earth Science and Technology (JAMSTEC)), Yohey Suzuki(Graduate School of Science, The University of Tokyo), Keisuke Fukushi(Institute of Nature & Environmental Technology, Kanazawa University), Katsunori Yanagawa(Graduate School of Social and Cultural Studies, Kyushu University), Chairperson:Keisuke Fukushi(Institute of Nature & Environmental Technology, Kanazawa University), Chairperson:Katsunori Yanagawa(Graduate School of Social and Cultural Studies, Kyushu University), Chairperson:Yoshinori Takano(JAMSTEC)

10:45 AM - 11:00 AM

[BCG07-07] Experimental study of hypervelocity impact of meteoritic material into liquid water in an open system for better understanding of the fate of extraterrestrial organics in the Hadean ocean

★Invited papers

*Manabu Nishizawa1, Yohei Matsui1, Takazo Shibuya1, Konomi Suda1, Ken Takai1, Hajime Yano2 (1.Japan Agency for Marine-Earth Science and Technology, 2.Japan Aerospace Exploration Agency for Space and Technology )

Keywords:hypervelocity impact, hedean ocean, meteorite

Unravelling the origin(s) of prebiotic organic materials that constituted protocells on the early earth is important to constrain the conditions for the emergence of life and the chemical diversity of life in the universe. One proposes that biologically relevant organic materials were mostly produced through atmospheric chemistry and mineral-water interactions from simple compounds (N2, CO2, CO, CH4) available in the early earth, whereas the other proposes that a significant amount of extraterrestrial organic materials, that were produced in the early solar system, protoplanetary disk, and molecular clouds, were delivered to the early earth and served as key components of protocells. If the latter hypothesis is correct, most of the extraterrestrial organic materials in meteorite should have been survived from thermal decomposition during hypervelocity impact into the Hadean ocean (>3 km/s), because geological evidences suggest that the ocean was already present but the continent was almost absent in the Hadean earth. However, the fate of extraterrestrial organic materials during oceanic impact is poorly understood due to the lack of experimental knowledge about the physicochemical processes associated with the hypervelocity impact of meteorite into liquid water. For better understanding of the physicochemical processes associated with the hypervelocity impact of meteorite into liquid water and the fate of impactor, we have newly establish a methodology of experimental impact in an open system that can simulate the Pressure-Temperature path of oceanic impact most faithfully. In this meeting, we report experimental results that polycarbonate and stainless steel projectiles impacted into liquid water at a velocity of 4-6 km/sec.