Mineralogical alteration of a type A CAI from Allende CV3 chondrite: Formation of secondary dmisteinbergite and its phase transition to anorthite
DC Field | Value | Language |
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dc.contributor.author | Enokido Yuma | - |
dc.contributor.author | Nakamura Tomoki | - |
dc.contributor.author | Matsumoto Megumi | - |
dc.contributor.author | Miyake Akira | - |
dc.contributor.author | Shibuya Takazo | - |
dc.contributor.author | Park, Changkun | - |
dc.contributor.author | Zolensky Mike | - |
dc.date.accessioned | 2023-12-06T16:37:34Z | - |
dc.date.available | 2023-12-06T16:37:34Z | - |
dc.date.issued | 2023 | - |
dc.identifier.uri | https://repository.kopri.re.kr/handle/201206/14844 | - |
dc.description.abstract | Dmisteinbergite, a hexagonal form of CaAl2Si2O8, was found in a compact type A Ca-Al-rich inclusion (CAI) in the Allende CV3 chondrite. Scanning and transmission electron microscopic observations show that dmisteinbergite was always in contact with grossular and grossular was in contact with melilite. In addition, there is a crystallographic relationship between dmisteinbergite and anorthite. Based on the textural and crystallographic evidence, the following mineralogical alteration processes are proposed to have occurred in the CAI. (1) Melilite was replaced by grossular. High densities of vesicles in the grossular indicate that hydrogrossular might have been the primary alteration phase and dehydrated by later metamorphism. (2) Dmisteinbergite formed from (hydro)grossular through a reaction with Si-rich fluid. (3) Nano-sized minerals are formed within dmisteinbergite. (4) Dmisteinbergite was transformed to anorthite. (5) Both anorthite and dmisteinbergite were altered to nepheline. (6) Hydrogrossular was dehydrated to grossular. (Hydro)grossular, dmisteinbergite, anorthite, and nepheline in the CAI seem to have formed in the course of metasomatism that occurred in the Allende parent body. Except for the hydrogrossular dehydration, these reactions could have occurred at moderate temperature (200-250 degrees C) in high pH fluids (pH 13-14) according to past experimental studies. Episodic changes in fluid composition seem to have occurred before reactions (2), (4), and (5), because these reactions were not completed before the next reaction started. Higher temperature is required for reactions (5) and (6) to occur. Our observation of the CAI suggests that it experienced multiple episodes of metasomatism as temperatures were rising in the Allende parent asteroid. | - |
dc.language | English | - |
dc.subject.classification | 기타(현미경) | - |
dc.title | Mineralogical alteration of a type A CAI from Allende CV3 chondrite: Formation of secondary dmisteinbergite and its phase transition to anorthite | - |
dc.title.alternative | 아옌데 콘드라이트의 type A CAI에서 나타나는 2차 dmisteinbergite와 anorthite로의 상전이 기작 | - |
dc.type | Article | - |
dc.identifier.bibliographicCitation | Enokido Yuma, et al. 2023. "Mineralogical alteration of a type A CAI from Allende CV3 chondrite: Formation of secondary dmisteinbergite and its phase transition to anorthite". <em>METEORITICS & PLANETARY SCIENCE</em>, 58(3): 405-420. | - |
dc.citation.title | METEORITICS & PLANETARY SCIENCE | - |
dc.citation.volume | 58 | - |
dc.citation.number | 3 | - |
dc.identifier.doi | 10.1111/maps.13961 | - |
dc.citation.startPage | 405 | - |
dc.citation.endPage | 420 | - |
dc.description.articleClassification | SCIE | - |
dc.description.jcrRate | JCR 2021:47.126 | - |
dc.subject.keyword | CAIs | - |
dc.subject.keyword | carbonaceous chondrite | - |
dc.subject.keyword | hydrothermal alteration | - |
dc.identifier.localId | 2023-0018 | - |
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