蛇纹石化

它在遭受角闪岩相变质作用之前，曾经历过低变质蛇纹石化阶段（形成蛇纹岩）。

Before it underwent metamorphism of amphibolite facies , it had experienced low-grade serpentinization and formed into serpentinite .

元古代岩浆作用、硫化作用和蛇纹石化作用是煎茶岭镍矿床主要的成矿作用方式；

Proterozoic magmatism , sulfurization , and serpentinization are the main metallogenic ways of the nickel sulfide deposit .

蛇纹石化橄榄岩的Pb／Ce比值远高于岛弧玄武岩和大陆地壳。

Also Pb / Ce ratio is higher than island arc basalt and continental crust .

变超基性岩蛇纹石化橄榄岩的稀土元素配分具典型的U形特征，显示为具地幔交代作用的LREE富集地幔残余。

The REE distribution of serpentinized peridotite in ultrabasic rocks is the characteristic of U-type , showing that it was the LREE enriched residual mantle experienced in mantle metasomatism .

论超基性岩体的蛇纹石化问题

On the problem of the serpentinization of ultra basic rocks

蛇纹石化过程中，主要元素均显示活动性。

Major elements showed mobility during serpentinite from Si-rich rocks .

经滑石-蛇纹石化，进而碳酸盐化，导致微量金解离。

After the talc serpentinization and carbonation , micro gold has been separated .

蛇纹石化大理岩是主要找矿标志。

The serpentinized marble is the main ore guide .

海山顶部的岩石是由蛇纹石化超镁铁质方辉橄榄岩组成。

The rocks at the top of the seamount consist of serpentinized ultramafic harzburgite .

秦皇岛青龙蛇纹石化大理岩的特征

Features of Serpentined Marble from Qinglong , Qinhuangdao

稍后的蛇纹石化作用是形成该矿床中后期富镍矿体的主要原因；

Late serpentinization are the main reason to form latter rich nickel ore bodies .

结果表明，玉石主要由蛇纹石化大理岩组成，与现代蓝田玉的成分和玉质相似。

The results show that the Qinglong jade is mainly composed of serpentined marble , similar to modern Lantian jade in both composition and texture .

岩体与围岩接触处常有内、外蚀变带，与围岩呈侵入接触，局部呈断层接触。徐麦岩体岩石都遭受了一定程度的蛇纹石化和碳酸盐化。

Rocks are in frequent contact position with the outer alteration zone , and the rock are in intrusive contact , was the fault of local contacts .

我国主要超镁铁岩蛇纹石化水的非大洋成因&（L-C）蛇纹岩的D/H和~（18）O/~（16）O

Non-oceanic origin of Waters in the Serpentinization of Some Ultramafic Rocks from China & D / H and ~ ( 18 ) O / ~ ( 16 ) O of Waters in Serpentinites

各阶段热液性质、流体来源及铂族元素热液活动性分析表明，蛇纹石化阶段铂族元素热液活动最强烈，主要表现为就地改造；

By the analysis of property and the origin of hydrothermal fluids , PGE remobilization in each stage had been discussed . Of three stages , PGE remobilization is the most marked in serpentinization , but mainly modified in situ .

由于强烈的蛇纹石化，残余的橄榄石（Fo9293）仅占5%～40%，斜方辉石富镁（En8793）并有解理弯曲等韧性变形现象。

Due to intensive serpentinization olivine relicts ( Fo 92 93 ) are scarce , only 5 % 40 % . The orthopyroxenes are magnesium rich ( En 87 93 ) and had undergone ductile deformation , showed as bending of cleavages and others .

广泛分布在雅鲁藏布江蛇绿岩带的地幔橄榄岩是没有蛇纹石化的新鲜岩石，因而通过显微镜下观察和全岩化学分析探索其成因和地幔活动，是十分有利和简便的。

The mantle peridotites widely distributed along the Yarlung Zangbo River ophiolite zone are fresh rocks not subjected to serpentinization . Therefore , the observation under microscope and the whole rock chemical analysis are simple and convenient means for investigating their genesis and the mantle activity .