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There are remarkable differences among chondrite groups in petrographic, mineralogical, chemical and O isotopic characteristics.

不同的球粒陨石群,其岩石学、矿物学、化学及氧同位素组成均有明显的差异。

In addition to the established groups,there are about ten unique chondrites or chondrite grouplets, and also numerous ungrouped irons and iron grouplets.

此外 ,还发现1 0个独特的球粒陨石、许多未分群的球粒陨石小群、铁陨石和铁陨石小群,它们也来自各自不同的母体。

The chemical-petrographic types of these meteorites are presented below.Six are unequilibrated ordinary chondrites,including three H3 and three L3;92 meteorites are equilibrated ordinary chondrites,including 24 H-group(13 H4,10 H5,1 H6),64 L-group(2 L4,44 L5,18 L6) and 4 LL-group(3 LL4,1 LL5);the other two belong to stone-iron meteorites.In 6 unequilibrated ordinary chondrites,chondrules are well-shaped,and olivine and low-Ca pyroxene are commonly zoned and have wide ranges of composition.The olivine and low-Ca pyroxene in the other 92 equilibrated ordinary chondrites have similar composition,respectively,and to some degree it reflected thermodynamics equilibration in olivine and lowCa pyroxene.

并根据矿物-岩石学特征,划分了它们的化学-岩石类型:6块属于非平衡型普通球粒陨石(H3和L3群各3块);92块属于平衡型普通球粒陨石,包括:H群24块(13块H4,10块H5,1块H6),L群64块(2块L4,44块L5,18块L6),LL群4块(3块LL4,1块LL5);另外两块属于石-铁陨石。6块非平衡型普通球粒陨石保存了原始的岩石学和矿物化学特征,包括:清晰的球粒结构、橄榄石和低钙辉石具有明显的成分环带以及极不均一的化学组成等。92块平衡型普通球粒陨石中的橄榄石和低钙辉石显示出均一的化学组成,表明它们达到了一定的热力学平衡。

According to bulk chemistry, the ungrouped GRV 98003 is classified into IAB group, and the ungrouped Ujimqin as a unique iron of IAB iron meteorite complex.

根据化学组成,重新对这两个未分群的铁陨石进行了分类工作,其中将GRV98003铁陨石划分为IAB群,乌珠穆沁铁陨石划分为与IAB群相关的单独铁陨石。

Some of these chemicals are thought to have come from a planet-forming disk of gas and dust that swirled around our young sun. Meteorites carrying the chemicals might have crash-landed on Earth.

部分有机物被认为来自围绕我们原始太阳的原始行星盘中的气体和尘埃,落在地球的陨石群带来另外一些有机物。

It is said that in March 1976 the meteorite shower happened there for 10 minutes. Innumerable aerolites including the largest one of 1770 kg fell and an enormous group of aerolites formed.

传说1976年3月这儿曾下过长达10分钟的&陨石雨&,形成了庞大的陨石群,其中最大的一块陨石重达1770公斤。

That is because, among the 10% that are not chondrites, there is a group that is composed almost entirely of metal.

这是因为,在那10%不属于球粒状陨石的陨石中,有一群几乎完全是由金属组成的。

According to SiO2 ,∑FeO, MgO and CaO content distribution in the histograms, chemical groups of the 23 chondrites were tentatively divided.

应用陨石中SiO_2、∑FeO、MgO、CaO的含量进行图解对比,划分出陨石的化学群,取得了初步的结果。

The others include 1 martian meteorite, 1 HED meteorite and 6 L3 ordinary chondrites. These 20 equilibrated ordinary chondrites are classified into chemical groups of H, L and LL, respectively, based on mean Fa content of oli-vine, mean Fs of low - Ca pyroxene and abundance of Fe-Ni metal.

根据橄榄石的平均Fa值、低Ca辉石的平均Fs值和Fe-Ni金属含量将这20块陨石分别划分为H、L和LL等化学群;根据球粒结构、基质重结晶程度和矿物成分对这些陨石进行岩石类型的划分。

Hovering in the mesosphere, Superman zipped back and forth, desperately pulverizing one huge meteor after another.

带着呼啸声,超人在陨石群中心来回折返着,拼命磨碎一个接一个巨大的陨石。

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