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AWNL 你所不知道的瑞典M陨石

  AWNL 的 M系列--瑞典陨石系列,采用瑞典北部独有的天外陨石,这种稀世之宝,很多国人还不太了解,在维基百科上扒了下来,原文和翻译如下。配以图片。AWNL 的M 限量系列,每年只有200条左右产量,买到赚到!

  Muonionalusta 大约在公元前一百万年落在北欧斯堪的纳维亚半岛,即现在的瑞典和芬兰交界处以西,精八面体,IVA类陨石群组


  1910年,陨石首先由A. G.Högbom教授公布于众,他用Muonio河附近的一个地名将陨石命名为“Muonionalusta”。

  Muonionalusta这个名字对于某些人来说很难发音:Muonio河上的muoni-显然是[mu-o-ni-o-na-lu-sta]或者/ MOO-oh-ne-oh-nah-loo-stah /意味着'食物'); - (o)n-可能是需要的连接词;最后一个元素alusta的意思是'基地,基础,立场,垫子,托盘',因此可能是'穆尼奥(河流)基地'。

  1948年NilsGöranDavid Malmqvist教授对陨石进行深入研究[2]  Muonionalusta,可能是已知最古老的陨石(4.56530亿年),[3]在科学上,它标志着铁陨石中首次发现超石英。


  对这种应强烈冲击而变质的铁陨石的最新分析显示,其含镍量为8.4%,痕量稀有元素为0.33 ppm镓,0.133 ppm锗和1.6 ppm铱。它还含有矿物铬铁矿,daubréelite,schreibersite,akaganite和硫铁矿包裹体[2],不含有放射物质,对人体无害。




  The Muonionalusta is a meteorite classified as fine octahedrite, type IVA (Of) which impacted in northern Scandinavia, west of the border between Sweden and Finland, about one million years BCE.

  The first fragment of the Muonionalusta was found in 1906 near the village of Kitkiöjärvi.[1] Around forty pieces are known today, some being quite large. Other fragments have been found in a 25-by-15-kilometre (15.5 mi × 9.3 mi) area in the Pajala district of Norrbotten County, approximately 140 kilometres (87 mi) north of the Arctic Circle.

  The meteorite was first described in 1910 by Professor A. G. Högbom, who named it "Muonionalusta", after a nearby place on the Muonio River. It was studied in 1948 by Professor Nils Göran David Malmqvist.[2] The Muonionalusta, probably the oldest known meteorite (4.5653 billion years),[3] marks the first occurrence of stishovite in an iron meteorite.

  The name Muonionalusta is difficult for some to pronounce: ['mu-o-ni-o-na-lu-sta] or /MOO-oh-ne-oh-nah-loo-stah/ from the Muonio River (muoni- apparently means ‘food’); -(o)n- could be a needed connective; the final element alusta means ‘base, foundation, a stand, mat, tray’, thus probably ‘Munio (River) base’.

  Studies have shown it to be the oldest discovered meteorite impacting the Earth during the Quaternary Period, about one million years ago. It is quite clearly part of the iron core or mantle of a planetoid, which shattered into many pieces upon its fall on our planet.[4] Since landing on Earth the meteorite has experienced four ice ages. It was unearthed from a glacial moraine in the northern tundra. It has a strongly weathered surface covered with cemented faceted pebbles.

  New analysis of this strongly shock-metamorphosed iron meteorite has shown a content of 8.4% nickel and trace amounts of rare elements—0.33 ppm gallium, 0.133 ppm germanium and 1.6 ppm iridium. It also contains the minerals chromite, daubréelite, schreibersite, akaganéiteand inclusions of troilite.[2] For the first time, analysis has proved the presence of a form of quartz altered by extremely high pressure—stishovite,[2] probably a pseudomorphosis after tridymite. From the article "First discovery of stishovite in an iron meteorite":[1]

  Stishovite, a high pressure polymorph of SiO2, is an exceptionally rare mineral...and has only been found in association with a few meteorite impact structures.... Clearly, the meteoritic stishovite cannot have formed by isostatic pressure prevailing in the core of the parent asteroid.... One can safely assume then that stishovite formation (in the Muonionalusta meteorite) is connected with an impact event. The glass component might have formed directly as a shock melt....

  A 2010 study reported the lead isotope dating in the Muonionalusta meteorite and concluded the stishovite was from an impact event hundreds of millions of years ago: "The presence of stishovite signifies that this meteorite was heavily shocked, possibly during the 0.4 Ga [billion years] old breakup event indicated by cosmic ray exposure...."[3]

发布时间:2018-03-07 15:48:00 来源:会员投稿 编辑:AWNLsweden