一块火星陨石辉玻无球陨石(Shergottite)，NWA7397，45克，熔壳基本完整

346113422 · 发表于 2013-4-6 12:52:23

本帖最后由 346113422 于 2013-4-6 12:55 编辑

martian_nwa7397_45g web.jpg

还有若干小一点的，可以转让或交换。以下是METEORITICAL BULLETIN官方公布结果:

Northwest Africa 7397 (NWA 7397)

Northwest Africa

Purchased: 2012 Jun

Classification: Martian meteorite (Shergottite)

History: Found near Smara, Morocco and purchased by Darryl Pitt and David Gheesling from a dealer in Zagora, Morocco in 2012 June.

Physical characteristics: A 2130 g, partially covered in fusion crust. Interior larger ovoid crystals in a finer grained matrix.

Petrography: (A. Irving and S. Kuehner, UWS) Large oikocrysts (up to 1.5 cm across) of low-Ca pyroxene enclose multiple chadacrysts of olivine and Cr-rich chromite. Relatively equigranular domains between oikocrysts are composed of low-Ca and high-Ca pyroxene (showing very limited compositional zoning), maskleynite and olivine with accessory merrillite, Ti-chromite, pyrrhotite and ilmenite (with associated grains of baddeleyite up to 10 μm across). Olivine contains sparse melt inclusions composed of K-Na-Al-Si-rich glass surrounded by characteristic post-shock radial expansion microfractures.

Geochemistry: Olivine (Fa38.9-40.7; FeO/MnO = 47-54), orthopyroxene (Fs30.3Wo3.3; FeO/MnO = 36), pigeonite (Fs25.1-27.6Wo6.6-10.0; FeO/MnO = 28-33), subcalcic augite (Fs17.0-19.0Wo35.1-35.4; FeO/MnO = 22-25). Bulk trace element composition (G. Chen, UAb): analysis by ICP-MS of clean wire-saw cutting dust gave (in ppm) La 1.66, Ce 4.48, Nd 2.93, Sm 1.13, Eu 0.3, Gd 1.59, Dy 1.95, Yb 1.02, Lu 0.14, Hf 1.66, Th 1.15, Rb 2.89, Sr 33.6.

Classification: Martian (shergottite, poikilitic).

Specimens: A total of 20 g of type material and one large polished thin section are on deposit at UWB. The main mass is held jointly by DPitt and D. Gheesling.

ANGELS · 发表于 2013-4-6 13:29:37

这么大啊，震撼！

杰克矿长 · 发表于 2013-4-15 10:36:48

{:soso_e179:}

乐★鬼♂ · 发表于 2013-4-15 11:16:43

两千多克呢分离出来的柯老师这块也不算小哦~~~~~~~~~~~~~~~~~~~~

东方红 · 发表于 2013-4-15 11:29:17

提示: 作者被禁止或删除内容自动屏蔽

meikun · 发表于 2013-4-15 12:49:35

分享。

2814543835 · 发表于 2013-4-15 14:35:25

又见辉玻无球粒，好东西！

lrzx6969 · 发表于 2013-4-15 14:46:15

学习、学习！

pgj1977 · 发表于 2013-7-31 12:04:37

学习{:soso_e160:}

╰☆雨￡柔儿☆ · 发表于 2013-10-18 00:05:19

学习赞

╰☆雨￡柔儿☆ · 发表于 2013-10-18 00:05:22

学习赞

laojiangkou · 发表于 2013-10-27 17:57:05

{:soso_e179:}

游天下 · 发表于 2013-11-2 10:26:10

柯博手里那么多好东西。眼红了:

淡泊以待乏 · 发表于 2014-10-14 16:41:45

共赏了

君彩 · 发表于 2014-11-2 18:17:13

柯博士有近照和多方位照，让陨友共同学习火星风采更好，这可能就是名人效应，要是普通陨友不是沉积岩就是没有陨石特征

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一块火星陨石辉玻无球陨石(Shergottite)，NWA7397，45克，熔壳基本完整

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