Petrological Study of Martian Meteorites

火星陨石的岩石学研究

• 批准号: 10440149
• 负责人: IKEDA Yukio
• 金额: $ 3.26万
• 依托单位: IBARAKI UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10440149/
• 关键词: Martian Meteorites; Magmatic Inclusions; Kaersutite; Cumulative Meteorites; Basaltic Meteorites; Shergottites; シャーゴッタイト; ALH77005隕石; Y-793605隕石; DaG735隕石; 結晶分化作用; エイコンドライト隕石; 隕石; エイコンドライト; 沈積岩質火星隕石; 火成のマグマ活動; 角閃石; マスケリナイト; 火星マグマの結晶作用; 火

The petrological study on Martian meteorites was carried out in details. Especially it was stressed to investigate the occurrence and to clarify the genesis of magmatic inclusions that occur in Martian cumulative and basaltic shergottites. Magmatic inclusions in Martian meteorites are very small with about 10-100 micrometers across, and occur in phenocrystic minerals (olivine and pyroxene). They consist mainly of olivine, fassaite, plagioclase, a silica mineral, or Kaersutite in addition to igneous glass, and are very important because they have direct information on their parent magmas and formational conditions. Two lherzolitic (cumulative) shergottites (ALH77005 and Yamato-793605) have a nearly same mineral assemblage, although the two show slightly different lithologies. They may have been produced from Martian parent magmas that have chemical compositions similar to a typical basaltic meteorite (the shergotty meteorite). It was also clarified that magmatic inclusions occurring in olivine in the lherzolitic meteorites are different in mineral assemblages and mineral compositions from those in pyroxene. This difference may be due to their different stages of magmatic fractional crystallization. Kaersutite was found o to occur in the two lherzolitic shergottites, and the water vapor pressure of their coexisting magmas was estimated to be less than 1 kilo bars. Magmatic inclusions in basaltic shergottites (DaG735, and so on) also were surveyed in details. They differ in mineral assemblage from those in the lherzolitic shergottites, and seem to have crystallized on a meta-stable condition. The DaG735 may have formed as a cumulative basaltic lithology, which contains a large number of phenocrystic olivine in a basaltic melt.

对火星陨石进行了详细的岩石学研究。特别强调了对火星堆积岩和玄武岩六角岩中岩浆包裹体的产状进行调查，并阐明岩浆包裹体的成因。火星陨石中的岩浆包裹体非常小，直径约为10-100微米，并且存在于斑晶矿物（橄榄石和辉石）中。除了火成玻璃之外，它们主要由橄榄石、铁赛石、斜长石、硅矿物或钙苏石组成，因此非常重要，因为它们拥有有关其母岩浆和形成条件的直接信息。两种二辉橄榄岩（累积）六角辉岩（ALH77005 和 Yamato-793605）具有几乎相同的矿物组合，尽管两者的岩性略有不同。它们可能是由火星母岩浆产生的，其化学成分类似于典型的玄武岩陨石（谢尔戈蒂陨石）。还澄清了二辉橄榄石陨石中橄榄石中的岩浆包裹体在矿物组合和矿物成分上与辉石中的岩浆包裹体不同。这种差异可能是由于它们的岩浆分异结晶阶段不同所致。在两块二辉橄榄岩中发现了钙苏铁矿，它们共存岩浆的水蒸气压估计小于 1 公斤巴。对玄武岩角辉岩（DaG735等）中的岩浆包裹体也进行了详细调查。它们的矿物组合与二辉橄榄石斜角辉石中的矿物组合不同，并且似乎是在亚稳定条件下结晶的。 DaG735可能形成为累积玄武岩岩性，在玄武岩熔体中含有大量斑晶橄榄石。

项目成果

Ikeda, Y.: "Petrology of the Asuka-881931 ureilite with special reference to crystallization of interstitial silicate melt"Meteoritics and Planetary Science. Vol.34. 625-636 (1999)

Ikeda, Y.：“Asuka-881931 ureilite 的岩石学，特别涉及间隙硅酸盐熔体的结晶”流星学和行星科学。

Y.Ikeda: "Magmatic Inclusions and Felsic Clasts in the Dar al Gani 319 Polymict Ureilite"Meteorities and Planetary Science. Vol.36 No.4. 1-20 (2001)

Y.Ikeda：“Dar al Gani 319 Polymict Ureilite 中的岩浆包裹体和长英质碎屑”流星和行星科学。

Y.Ikeda: "Petrology and Mineralogy of the Yamato-793605Martian Meteorite"Antarctic Meteorite Research. Vol.10. 13-40 (1997)

Y.Ikeda：“Yamato-793605火星陨石的岩石学和矿物学”南极陨石研究。

Ikeda Y. et al.: "Petrology and Mineralogy of the Yamato-793605 Martian Meteorite"Antarctic Meteorite Research. 10. 13-40 (1997)

Ikeda Y.等：“Yamato-793605火星陨石的岩石学和矿物学”南极陨石研究。

Ikeda, Y.: "Magmatic Silicate Inclusions in The ALH-77005 Martian Lherzolitic Shergottite"Meteoritics and Planetary Science. Vol.33. 803-812 (1998)

Ikeda, Y.：“ALH-77005 火星二辉橄榄石中的岩浆硅酸盐包裹体”流星学和行星科学。