안녕하십니까.

오는 수요일(10월 2일) 오후 4:00에 아래와 같이 2024년 하반기 정규 콜로키움이 진행될 예정입니다.

발표 후에는 연사와의 대화시간(5:00-5:40) 및 저녁 식사가 예정되어 있으니 많은 참여 부탁드립니다.

발표자: 이승열 교수 (충북대학교)

호스트: 권윤영

장소: 장영실홀 331-2 및 원격 연결

일시: 10월 2일 (수) 오후 4:00

접속주소: https://zoom.us/j/92444602963?pwd=VXJzWE1zd3VkYmZ1SjRMeXRFQy9kQT09

교육학점: 천문연 소속 현장참석자의 경우 필수 0.5 학점 부여

제목: Thermal decomposition of Murchison CM2 carbonaceous chondrite: Implications of space weathering processes for  sample return missions

초록: 

We have undertaken a multidisciplinary study of the thermal decomposition of Murchison CM2 carbonaceous chondrite as an analog to metamorphic process that may have occurred on carbonaceous asteroids. The pre- and post-heated Murchison powders were analyzed using X-ray diffraction, thermal and evolved gas analysis, visible-near-infrared spectroscopy, microto nanoscale analyses included scanning and transmission electron microscopy. Mineralogical analyses of the unheated Murchison samples identified fine-grained serpentine, rounded Mg-rich serpentine (chrysotile-type), platy Fe-rich serpentine (cronstedtite-type), tochilinite, tochilinite-cronstedtite intergrowths, olivine, pyroxene, iron-nickel sulfides, magnetite, potassium iron-nickel sulfide, calcite, gypsum, apatite, Cr-bearing spinel, and chromite. The tochilinite shows the contorted morphology, mainly showing (002) lattice fringes of ~5.4 Å spacing and the identification of a new twinning relationship on the (032) plane. In response to thermal effects, serpentine group minerals are converted into mixtures of sub-μm olivine and pyroxene grains with similar Mg/Mg+Fe ratios as the precursor. Tochilinite breakdown forms troilite, magnetite, and minor Fe-Ni metal aggregates via amorphization. The thermal processing of Murchison carbonaceous chondrite produces distinctive micron and submicron structures that correspond to the breakdown of key minerals. These findings will be useful for understanding the thermal history of carbonaceous asteroids and for analyzing samples returned from ongoing missions to primitive asteroids (101955) Bennu and (162173) Ryugu.

진행언어: 한국어

슬라이드언어: 영어

원격 접속 방법 :

A. 웹 브라우저: Chrome을 추천하며 아래 주소를 실행시 Zoom 구동을 위한 프로그램이 설치될 수 있음

B. 접속 주소: https://zoom.us/j/92444602963?pwd=VXJzWE1zd3VkYmZ1SjRMeXRFQy9kQT09

C. 유의사항: 접속 후 "마이크는 뮤트로 설정" - 기본설정은 뮤트로 되어있음 > 질의 응답시간에는 마이크를 사용해서 질문 가능함

2024년 하반기 천문연구원 콜로키움 일정

https://www.kasi.re.kr/kor/post/eng_colloquium?searchType=default&searchTxt=&searchExtr7=2024-fall

(위 일정은 연사분의 상황에 따라서 변경될 수 있습니다.)

천문연 콜로키움 위원회 (김종수, 선광일, 이창원, 문홍규, 노혜림, 한정열)

운영위원회 (김진호, 김영민, 이석호, 송영범, 오재석, 윤용민) 

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Dear all,

The KASI's regular colloquium is scheduled at Oct. 2, as shown below.

A conversation session with speakers and dinner are scheduled after the colloquium.

Speaker: Prof. Seungyeol Lee (Chungbuk National University)

Host: 권윤영

Place: Jang Yeong-sil Hall 331-2 & Online

Time: October 2 (Wed) 4:00 pm 

Access: https://zoom.us/j/92444602963?pwd=VXJzWE1zd3VkYmZ1SjRMeXRFQy9kQT09

KASI Educational credits: 0.5 educational credits are awarded to off-line attendees.

Title: Thermal decomposition of Murchison CM2 carbonaceous chondrite: Implications of space weathering processes for  sample return missions

Abstract: 

We have undertaken a multidisciplinary study of the thermal decomposition of Murchison CM2 carbonaceous chondrite as an analog to metamorphic process that may have occurred on carbonaceous asteroids. The pre- and post-heated Murchison powders were analyzed using X-ray diffraction, thermal and evolved gas analysis, visible-near-infrared spectroscopy, microto nanoscale analyses included scanning and transmission electron microscopy. Mineralogical analyses of the unheated Murchison samples identified fine-grained serpentine, rounded Mg-rich serpentine (chrysotile-type), platy Fe-rich serpentine (cronstedtite-type), tochilinite, tochilinite-cronstedtite intergrowths, olivine, pyroxene, iron-nickel sulfides, magnetite, potassium iron-nickel sulfide, calcite, gypsum, apatite, Cr-bearing spinel, and chromite. The tochilinite shows the contorted morphology, mainly showing (002) lattice fringes of ~5.4 Å spacing and the identification of a new twinning relationship on the (032) plane. In response to thermal effects, serpentine group minerals are converted into mixtures of sub-μm olivine and pyroxene grains with similar Mg/Mg+Fe ratios as the precursor. Tochilinite breakdown forms troilite, magnetite, and minor Fe-Ni metal aggregates via amorphization. The thermal processing of Murchison carbonaceous chondrite produces distinctive micron and submicron structures that correspond to the breakdown of key minerals. These findings will be useful for understanding the thermal history of carbonaceous asteroids and for analyzing samples returned from ongoing missions to primitive asteroids (101955) Bennu and (162173) Ryugu.

Language: Korean

Slide Language: English

Remote access procedure:

A. Web browser: Chrome - When executing the address below, a program for additional zoom operation can be installed.

B. Access: Go to  https://zoom.us/j/92444602963?pwd=VXJzWE1zd3VkYmZ1SjRMeXRFQy9kQT09

C. Notice: After join, Please mute your microphone. - The default setting is microphone mute. > After the presentation, during the Q&A session, you can use the microphone to ask questions.

2024B KASI Colloquium Schedule

https://www.kasi.re.kr/kor/post/eng_colloquium?searchType=default&searchTxt=&searchExtr7=2024-fall

(This schedule may vary depending on the speakers' schedule.)

KASI Colloquium committee (Jongsoo Kim, Kwang-Il Seon, Chang Won Lee, Hong-Kyu Moon, Hyerim Noh, Jeong-Yeol Han)

Working committee (Jinho Kim, Young-Min Kim, Seokho Lee, Youngbum Song, Jae Sok Oh, Yongmin Yoon)