Petrological studies on the HED meteorites and their parent bodies

HED陨石及其母体的岩石学研究

• 批准号: 17540450
• 负责人: YANAI Keizo
• 金额: $ 1.41万
• 依托单位: Iwate University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17540450/
• 关键词: Howardite(How); Eucrite(Euc); Diogenite(Dio); 4 Vesta; HED Meteorite; Holocrystalline Howardite; Breccia; Achondrites; Howardite; Eucrite; Diogenite

The meteorite specimen 1152 is an unbrecciated-holocrystalline achondrite showing quite unique texture. The lithology of this specimen is quite differ from all known achondrite meteorites, however it might be classified to one of howardite group for its chemical compositions and mineral assemblages. The specimen is as same as mineral assemblage of the most howardites, and it consists mainly of pyroxene(En47.4-82.5 Fs17.4-34.8 Wo0.9-35.2) and plagioclase(Ab5.8-10.4 An89.2-94.2 Or0.0-0.3) with some olivine(Fo58.6-63.0 Fa37.0-41.4). It is also almost same bulk chemistry of howardite, such as typical howardite Yamato-791157 polymict breccia.The quite unique texture of the specimen might be indicated that this specimen is impactite with howardite compositions. However author expected that the meteorite specimen is the first howardite with unbrecciated-holocrystalline texture originated by the magma process on the HED(Howardite-Eucrite-Diogite) parent body possible asteroid 4 Vesta. The bulk chemical compositions of the specimen 1152 meteorite is 49.50SiO_2,0.09TiO_2,7.34Al203,6.28Fe_2O_3,9.73FeO,0.37MnO,19.02Mg0,5.58CaO,0.19Na_2O,<0.02K20,0.1H_2O(+),0.10H_2O(-),0.21P_2O_5,0.52Cr_2O_3,1.42FeS,<0.1Fe, and tatal 100.57 in weight percent(%).

陨石标本1152是一种未造成的holocrystalline achondrite，显示出非常独特的质地。该标本的岩性与所有已知的Achondrite陨石差异很大，但是它可能被归类于Howardite组之一的化学成分和矿物组合。该标本与最多的霍华德人的矿物组合一样，主要由辉石（EN47.4-82.5 FS17.4-34.8 WO0.9-35.2）和斜长石（AB5.8-10.4 AN89.2-94.2 OR0）组成.0-0.3）带有一些橄榄石（FO58.6-63.0 FA37.0-41.4）。它也是霍华地石的大量化学，例如典型的霍华地石Yamato-791157 polymict角砾岩。标本的非常独特的纹理可能表明，该标本是带有霍华ardite构成的影响力。然而，作者预计陨石标本是第一个具有未造成的holocrystalline纹理的霍华地石，该质地由岩浆工艺源自HED（Howardite-Eucrite-Diogite）母体可能的小星体4 Vesta。标本1152陨石的大量化学成分为49.50SIO_2,0.09TIO_2,7.34AL203,6.28FE_2O_2O_2O_3,9.73FEO，0.37MNO，19.02MG0,5.58CAO，0.19NA_2O，0.19NA_2O，0.19NA_2O___2O_____________________1H_10.2O.1H_1H20.2O.2O.2O.2O.2O.2O.2O.2O.2O.2O.2O.2O.2O.2O） - ），0.21P_2O_5,5,52CR_2O_3,1.42FES，<0.1FE和TATAL 100.57重量百分比（％）。

项目成果

Unbrecciated-Holocrystalline Achondrite 1152 with Howardite Composition : Crystalline Howardite or Impactite

未角砾状全晶无球粒陨石 1152，含福华德石 成分：结晶福华德石或冲击石

• 期刊: Meteorites and Planetary Science (投稿中)
• 作者: Shigenori;Kawano;河野重範・入月俊明・石口 晃・野村律夫;Keizo Yanai
• 通讯作者: Keizo Yanai

Unbrecciatea-Holocrystalline Achondrite 1152 with Howardite Composition : Crystalline Howardite or Impactite

Unbrecciatea-全晶无球粒陨石 1152 与福华德石 成分：结晶福华德石或冲击石

• 期刊: Meteorites and Planetary Science (投稿中)
• 作者: Shigenori;Kawano;河野重範・入月俊明・石口 晃・野村律夫;Keizo Yanai;川上遼平;K.Yanai;Keizo Yanai
• 通讯作者: Keizo Yanai