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陨石球粒

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LREE depleted spinel lherzolite xenoliths are the 2%~15% partial melting residues of spinel lherzolite with 2 times REE concentration of chondrite. LREE enriched spinel lherzolite xenoliths are the prodiuct that 1% partial melting of garnet lherzolite derived melts mix in ratio of 2% with most LREE depleted spinel lherzolite.

轻稀土亏损的尖晶石二辉橄榄岩包体,是2倍球粒陨石稀土元素丰度的尖晶石二辉橄榄岩地幔经过2%~15%部分熔融后的残留体;而富集型尖晶石二辉橄榄岩包体可能为,来自深部石榴石二辉橄榄岩源区1%熔融形成的熔体以约2%的比例隐交代轻稀土元素最亏损的包体代表的幔源区后形成的。

The peak metamorphic minerals are garnet, omphacite,phengite and rutile with temperature of~500℃,pressure of~2.3Gpa.On the basis of geochemical analysis,the content of SiO2 in the eclogite ranges from 46.68%to 50.24%,Na2O+K2O 3.10~4.21%,and high REE with enriched LREE, LREE/HREE of 2.83~6.06.The REE pattern and trace element spidergram are similar with those of ocean island basalt,according with the blueschist from Longmucuo -Shuanghu suture zone.The protolith of the eclogite and blueschist are OIB,and they aremaybe the result of subduction of Permian OIB in central Qiangtang area.

对棉辉岩的地球化学分析显示,榴辉岩SiO_2含量在46.68—50.24%之间,Na_2O+K_2O含量在3.10—4.21%之间,稀土元素总量较高,轻稀土富集,重稀土相对亏损,LREE/HREE比值在2.83—6.06之间,稀土元素球粒陨石标准化曲线呈向右倾斜的样式,微量元素原始地幔标准化蛛网图OIB类似,这些特征和龙木错—双湖高压变质带的蓝片岩类似,它们的原岩为均为洋岛型玄武岩,形成环境类似于现在太平洋中的夏威夷,榴辉岩、蓝片岩很可能是羌塘中部地区出露的二叠纪洋岛型岩石俯冲消减的产物。

These subvolcanics, in which basalt, basaltic andesite and andesite are dominant, are petrochemically of calc alkaline affinity of subalkaline series and sodic type, and tend to have moderate low total REE, being LREE enriched.

岩石化学上属亚碱性系列、钙碱性火山岩系、钠质类型;稀土总量中低,属轻稀土富集型,稀土分布模式为右倾平滑曲线或略有正、负铕异常;过渡族元素球粒陨石标准化曲线形态呈&W&型,锶初始值为 0 。70 5398,反映物质来源较深。

Ashes of the coals with different ages and coal ranks from different localities of Guangxi were analysed for their rare-earth elements. The chondrite-normalized diagram of unmetamorphosed coal shows a v-shaped curve inclining towards the right.

广西不同产地、不同时代、不同煤种的煤灰稀土元素分析结果表明,未变质煤的球粒陨石标准化图呈右倾斜&V&型曲线,北美页岩标准化图呈近水平直线,煤中稀土元素没有发生分离和迁移。

The ultramafic rocks outcropped at the Altyn region are all harzburgites. Remant grains of primary minerals have melted residual texture and elastic deformation texture under high temperature and pressure. The whole-rock analyses show their low TiO〓 contents (0.01~0.04%), low Al, Ca and high MgO contents and wide Mg〓 range (89.35~95.57). Rare earth patterns have two types, namely tabacco pipe-shped and LREE-shaped, of which the former is often seen. The chondrite-nomalized Yb values of these analyses are all lower than 1. The spinels have low Ti and high Cr content and most spinels have Cr# higher than 60. All of the above characteristics show that the ultramafic rocks in the Altyn fault zone are components of metmorphic peridotites of ophiolite from depleted mantle source and most ophiolites from this zone belong to supra-subduction zone type ophiolite with a few mid-ocean ridge basalt type.

阿尔金露头区的超基性岩全为方辉橄榄岩,残余的新鲜矿物颗粒发育有熔融残余结构和高温高压下塑性变形结构,全岩分析显示样品TiO〓的含量低,为0.01~0.04%,具有低的Al和Ca,MgO含量高,Mg〓为89.35~95.57;稀土配分型式有两种,即烟斗型和LREE亏损型,前者占绝大多数,Yb球粒陨石标准化后的值全都小于1;尖晶石低Ti高Cr,大部分尖晶石的Cr〓大于60,上述特征说明阿尔金超基性岩是蛇绿岩的地幔橄榄岩成员,来自亏损的地幔源区,阿尔金蛇绿岩大多属于俯冲带之上型蛇绿岩,有少量的大洋中脊型蛇绿岩。

The CI chondrites are thought to have similar proportions of elements to those of the entire solar system.

CI 球粒陨石被认为是与整个太阳系有着相似的元素比例。

Normalized by chondrites and NASC, remarkable positive Eu anomalies are found.

与球粒陨石和北美页岩相比,Eu有较严重的正异常。

A stony meteorite that contains no chondrules.

无球粒陨石的或与之相关的。

We described Ningqiang's 13 Ca, Al-rich inclusions, 15 olivine aggregates, and some melting chondrules, discussed in different degree of detail the origin of these samples.

本工作共考察了约70克宁强陨石样品,描述了宁强十三个富Ca、Al包体、十五个杆拦石集合体及一些熔融球粒,并不同程度地讨论了这些样品的成因。

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