陨石

According to the studies of maskelynite and the mineral assemblages in the shock veins, it seems that the nowadays shock classifications of meteorites should be further modified.

根据对冲击变质主要压标熔长石性质的最新分析结果和陨石冲击脉体矿物组合研究的成果，指出现有陨石冲击变质分类的主要特点和某些不完善之处。

We plan to apply newly developed experimental techniques to the Dongujinmqin mesosiderite (1) we will study stable isotopic compositions

我们这一项目则从内蒙东乌旗石铁陨石入手，采用最新的实验技术和手段，（1）对这块陨石金属相中的Fe

Major element abundances of the silicate phase of the two mesosiderites are similar to those of howardites. The cosmic ray exposure ages are (242± 50) Ma for Dong Ujimqin Qi mesosiderite and (25.4± 5.0) Ma for Weiyuan mesosiderite.

东乌珠穆沁旗及渭源中铁陨石的硅酸盐相在主元素丰度上类似于紫苏钙长无球粒陨石，其宇宙射线暴露年龄分别为(252±50)Ma和(25.9±5.0)Ma。

Petrologic types for the 23 chondrites are ascertained mainly based on the property of chon-drules and matrix structures of the chondrites, as well as the composition of olivines, structures of pyroxenes and characteristics of feldspars, and so on.

陨石岩石类型的确定，主要根据陨石中球粒及基质的特征，参考其它标志，如橄榄石成分、辉石的结构、长石的特征等进行分类，效果较好。

Because of having some relationship with the bulk feature of inclusions, the rock features of this meteorite in petrology, petrologic chemistry, and meteorite matrix chemical compositions wre also studied.

宁强陨石全岩的特征（岩石学、岩石化学以及陨石基质的化学成份特征）由于与难熔包体总体特征有关也被给予研究。

The meteorite struck Tagish Lake in northern British Columbia and scattered in 500 pieces It was estimated that the meteorite sped to Earth at about 10 miles per second ?

陨石撞进 Tagish 湖，分散成500个碎片，估计陨石撞进地球的速度是每秒10哩，约子弹速度的20倍。

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。

To reach back, you need to look in the dust grains in chondrites, rather than at the chondrules.

如果是追溯太阳系形成之前，你需要研究球粒状陨石中的灰尘颗粒，而不是陨石球粒。

About 90% of meteorites are classified by the successors of Silliman and Kingsley as chondrites.

希里曼和金斯利的后继者将约90%的陨石都分类为球粒状陨石。

Do not gum up the work by telling mother what we are going to do .

别告诉母亲我们要干的事，那会把事情搞糟的。

In recent years, application of the partial prestressed concrete beam s is developed.

近年来，随着部分预应力砼梁应用的推广，发现我国规范所采用的名义拉应力法的计算结果不稳定。