方岩

The analysis method about ultra-trace PGE in rock samples is successfully used in the study on the characteristic of PGE in Kudi ophiolite suite and the following conclusions are made:(1) The difference of the mantle normalization of PGE patterns between dunite, harzburgite and lherzolite in Kudi indicates that they are residual of multi-stage partial melt of the mantle.

将建立的岩石样品中超痕量PGE分析方法成功地应用于西昆仑库地蛇绿岩中铂族元素示踪研究，并得出了以下结论：(1)库地地幔纯橄岩、方辉橄榄岩和二辉橄榄岩之间铂族元素地幔标准化配分模式的差异，表明它们是地幔多阶段部分熔融的残余。

The eclogite facies rock combination includes two-mineral eclogite,enstatite eclogite,garnet orthopyroxenite, garnet pyroxene peridotite and enstatite mylonite.

该地榴辉岩相岩石组合包括二矿物榴辉岩，顽火榴辉岩，石榴斜方辉石岩，石榴辉石橄榄岩和顽火辉石糜棱岩等。

Characterized by generally containing diopside, sphene, scapolite and apatite, the unit is composed of diopside gneisses and diopsidefeldspar granulitite, feldspardiopside granulitite, diopsidite and diopside marble.

该岩组由透辉片麻岩和透辉长石变粒岩、长石透辉变粒岩、透辉石岩、透辉大理岩组成，普遍以富含透辉石、榍石、方柱石和磷灰石为特征。

Characterized by generally containing diopside, sphene, scapolite and apatite, the unit is composed of diopside gneisses and diopside-feldspar granulitite, feldspar-diopside granulitite, diopsidite and diopside marble.

该岩组由透辉片麻岩和透辉长石变粒岩、长石透辉变粒岩、透辉石岩、透辉大理岩组成，普遍以富含透辉石、榍石、方柱石和磷灰石为特征。

There are two kinds of spinels in a granulite terrain of Yushujgou, South Tianshan Mountain. One occurs in the intermediate and basic granulite units and is characterized by enriched Al and poor Cr, belonging to Al_spinel. In thin sections it shows dark green color and subhedral to anhedral form, and coexists with other metamorphic minerals, suggesting a neogenic metamorphic mineral of granulite facies. The other occurs in the adjacent ultramafic rock unit, belonging to Cr_spinel. In thin sections, it is dark brown in color and is scattered among olivine, clinopyroxene and orthopyroxene as irregular grains, indicating a stable residual mineral in the process of granulite facies metamorphism.

新疆榆树沟麻粒岩地体中发育两类尖晶石：一类见于中、基性麻粒岩体中，其化学成分富 Al贫 Cr ，属铝尖晶石，镜下为深绿色，呈半自形至他形粒状，与其它变质矿物共生，表现为麻粒岩相的新生变质矿物；另一类发育在空间上与麻粒岩体紧密相邻的超镁铁质岩体中，为铬尖晶石，镜下为深褐红色，呈不规则粒状分布于橄榄石、斜方辉石和单斜辉石之间，为麻粒岩相变质过程中稳定的残余矿物。

Heat flows derived from garnet, chromite/chromium-spinel and pyroxene of xenoliths, xenocrysts in Mengyin and Fuxian kimberlites are higher than 40mW/m〓 calculated from the pyroxene inclusions in diamonds, and the range of pressure is 20～40kb (equivalent to 65～130km). Metasomatism (as indicated by yimengite and lindsleyite in Mengyin) is very strong in this depth range. Lherzolite, wehrlite, and diamond-free high-Ca harzburigite around the world are derived from this depth also. The observation suggests that the low-Ca harzburigitic environment for diamond stability had been changed significantly when the kimberlitic magmas erupted. This resulted from fluid interaction with harzburigite. The geotherm of the Cenozoic lithospheric mantle beneath Eastern-North China platform is higher than oceanic one. The temperature from the interior of the Tan-Lu faults is higher than that from apart off the fault.

除金刚石中的辉石温压投点落于40m W/m〓占地温线上外，捕虏体及捕虏晶中石榴石，铬尖晶石及单斜辉石的投点均偏离该地温线，显示较高的地温特点，而且捕虏体及捕虏晶的压力范围多在20-40kb(相当于65-130km)间，该深度范围内地幔的交代作用特别发育，如蒙阴大量发育的沂蒙矿、钛钾铬石等就发育于该深度范围，世界范围内不含金刚石的高钙方辉橄榄岩、二辉橄榄岩、异剥橄榄岩也分布于该区中，一方面表明捕虏体的主要取样位置已不在金刚石稳定区中，另一方面也表明金刚石稳定的橄榄岩环境，在金伯利岩侵位并捕虏他们时已发现了明显的改造，这种改造作用主要是通过长期的熔流体与先存的橄榄岩相互作用的结果。

We also report the exsolution texture of Crspinel in orthopyroxene in the studied harzburgite, and suggest that it is the result of a metamorphic reaction induced by the drastic increase of oxygen fugacity during the rapid emplacement of Darbut ophiolite.

方辉橄榄岩中的斜方辉石发育铬尖晶石出溶结构，出溶棒的成分特点表明，该结构是达拉布特蛇绿岩在快速就位过程中环境氧逸度突然升高诱发变质反应的结果。

We also report the exsolution texture of Cr-spinel in orthopyroxene in the studied harzburgite, and suggest that it is the result of a metamorphic reaction induced by the drastic increase of oxygen fugacity during the rapid emplacement of Darbut ophiolite.

方辉橄榄岩中的斜方辉石发育铬尖晶石出溶结构，出溶棒的成分特点表明，该结构是达拉布特蛇绿岩在快速就位过程中环境氧逸度突然升高诱发变质反应的结果。

The FeO~*and SiO_2 contents evidence that source rock was lherzolite when melting began, and the soure rock type has changed into harzburgite when melting persisted to a certain extent.

FeO*和SiO_2含量证明，熔融作用开始时，源岩为二辉橄榄岩；当熔融作用持续到一定程度时，源岩物质转化为方辉橄榄岩。

Peridotite xenoliths from Nüshan, Hannuoba and the Subei basin of the North China block have much lower water contents than those from other localities of the world (South Africa craton, New Mexico, Colorado plateau and basin and Range province of USA, South Mexico, French Central Massif and West Kettle of Canada). This difference is probably induced by the thermal erosion of asthenosphere during Mesozoic-Cenozoic period in the North China block.

结合已经发表的安徽女山和河北汉诺坝的橄榄岩数据，对比世界上其他地区橄榄岩的数据来看，华北的岩石圈地幔具有低的水含量：华北橄榄岩的单斜辉石水含量多＜200×10^(-6)，而世界上其他地区（包括南非克拉通、美国新墨西哥地区、美国Colorado高原、美国盆岭省地区、墨西哥南部、法国中央地体以及加拿大West Kettle地区）橄榄岩的单斜辉石水含量多＞200×10^(-6)；华北的斜方辉石水含量多＜100×10^(-6)，而世界上其他地区多＞100×10^(-6)；华北的橄榄岩全岩水含量多＜50×10^(-6)，而世界上其他地区多＞100×10^(-6)。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。