二辉橄榄岩

雷州半岛南部二辉橄榄岩包体成因探讨

Discussion about the origin of the lherzolite xenoliths in southern Leizhou Peninsula

声回波团块结构的温湿脉动特征中国东部新生代玄武岩中二辉橄榄岩团块的结构和组构

The temperature-moisture fluctuation character of sound lump echoes on the texture and fabric of some lherzolite nodules in Cainozoic basalt from eastern China

橄辉斜长岩具正堆积结构，Al2O3、CaO、∑REE和La/Yb明显高于二辉橄榄岩。

The olivine-augite anorthosites with cumulate texture is obviously higher in Al_2O_3 , CaO , REE , La / Yb and lower in MgO compared with the lherzolites .

含长二辉橄榄岩以其具有地幔橄榄岩特有的变晶结构和Ng（100）高温变形组构，以及含斜方辉石等特点而区别于堆晶岩。

The Pl-lherzolite differs from the cumulates in having blastic texture and high-temperature deformed fabric of Ng [ 100 ] characteristic of the mantle peridotite and yielding orthopyroxene .

二辉橄榄岩可能代表来自MOR环境下，弱亏损的上地幔残余岩片。

And lherzolites might represent remnants after partial melting of the weakly depleted upper mantle in a mid-ocean-ridge ( MOR ) environment .

高温高压下二辉橄榄岩的阻抗谱实验研究

Experimental Study on Impedance Spectra of Iherzolite under High Temperature and High Pressure

中国东部新生代玄武岩中二辉橄榄岩团块的结构和组构

On the texture and fabric of some lherzolite nodules in Cainozoic basalt from eastern China

上地幔由超镁铁质的二辉橄榄岩组成，在尖晶石二辉橄榄岩和石榴石二辉橄榄岩之间有一过渡层。

The upper mantle consists of lherzolite , and it seems that there is a transition zone between spinel and garnet lherzolites .

浙江新昌一带晚第三纪碱性玄武岩中地幔岩（二辉橄榄岩）捕虏体内存在大量硫化物熔体包裹体。

Mantle xenoliths captured in alkali basalt occurs widely in the Liuhe district , Jiangsu province , China , dominantly by spinel lherzolite .

含长二辉橄榄岩中新生矿物的出现，提供了基性熔体渗入的证据。

The appearance of new-born minerals ( clinopyroxene and plagioclase ) in the Pl-lherzolite provides an evidence for the penetration of basic melt .

岩石组合一般有二辉橄榄岩-橄榄二辉岩-二辉岩等岩相；镁铁质岩石组合一般有辉绿辉长岩相、辉长岩相、苏长岩-辉长岩-闪长岩相。

Rock combination generally have lherzolite-olive two pyroxenite-two metamorphic facies ; Mafic rocks combination generally have bright green gabbro , gabbro , norite-gabbro diorite .

证实了二辉橄榄岩及其单斜辉石在主元素有连续变化的趋势，反映了具部分熔融后残留相的性质。

Major element compositions in lherzolites and clinopyroxene separates display a successive variation , which indicates these rocks are residual phases after partial melting .

在矿物成分、化学成分及锶同位素等力面，含长二辉橄榄岩具有介于地幔橄榄岩和堆晶岩之间的某些过渡特征。

In respect of mineralogy and petrology as well as strontium isotope , the Pl-lherzolite exhibits some features of transition from the cumulates to the mantle peridotite .

碱性玄武岩及二辉橄榄岩捕虏体中的流体组成表明中国东部上地幔源区存在不均一性，碱性玄武岩浆在形成演化上存在地区差异性。

The fluid compositions of alkali basalts and Iherzolite xenoliths show high nonhomogeneity in the upper mantle source region and difference in alkali basaltic magma evolution in different districts .

本文对中国东部一些新生代玄武岩中二辉橄榄岩团块的结构进行了研究。

The ultramafic nodules widely distributed in Cainozoic basalt in eastern China are regarded as fragments of upper mantle that were brought up to the ground surface by basaltic magma .

含蓝宝石的玄武岩中含有大量的二辉橄榄岩，该种岩石是上地幔部分熔融出玄武岩熔体后的上地幔残留物。

The sapphire-bearing basalts contain abundant iherzolit es that belong to the remnants of the upper mantle left after the removal of basaltic melts from partial melting of the upper mantle .

上地幔部分熔融作用不仅控制了上地幔岩石类型演化（二辉橄榄岩→方辉橄榄岩→纯橄榄岩），同时它对铬铁矿的预富集起着关键作用。

The partial melting of the upper mantle not only controlled the evolution of mantle rock types ( lherzolite → harzber-gite → dunite ) but also played a critical role for chromite preconcentration .

在1.4GPa压力下获得二辉橄榄岩和辉石岩的弹性波速分别为7.87km/s和7.47km/s，最接近壳幔过渡带的弹性波速。

The vP values of lherzolite and pyroxenite obtained at 1.4 GPa are 7.87 km / s and 7.47 km / s respectively . These values are closest to that of rocks from the crust-mantle transition zone .

实验结果表明：二辉橄榄岩的阻抗谱对频率具有很强的依赖性，并从阻抗谱的测试原理（颗粒内部、颗粒边缘、样品与电极间的导电机制）上做出了解释；

The experimental results indicate that the complex impedance spectra of iherzolite strongly depends on frequency , at the same time we explain it by virtue of electrical conduction : grain boundaries , grain interiors as well as between sample and electrode ;

二辉辉石岩包体来自较冷的岩石圈，而二辉橄榄岩来自岩石圈与软流圈的过渡带，并且表明后者的地温梯度以对流热地温梯度为主。

It may be suggested that websterite xenoliths came from cooler lithosphere and lherzolite ones from the depth near to lithosphere asthenosphere boundary , and the latter is also indicating a smaller geotherm gradient that is nearly close to typical advective geotherm gradient .

主要岩石类型是方辉橄榄岩和纯橄榄岩，二辉橄榄岩极少（单斜辉石含量5～7%），具有典型的变质岩结构构造特征，矿物显微塑性变形普遍发育。

Lithologic types of the massifs are mainly harzburgite and dunite , with subordinated lherzolite ( orthopyroxene : 5 ~ 7 % ) . The textures and structures are similar to those of metamorphic rocks , and micro - plastic deformation of minerals is ubiquitous .

苦橄白榴岩、橄榄白榴玄武岩为原生岩浆冷凝产物，由金云母二辉橄榄岩成分的上地幔经部分熔融（约3.5-4.3%）所形成。

Based on the petrology , geochemistry and calculation , we suggest that the picrite-leucitite and olivine-leucite basalt were solidified by primitive magma which derived from phlogopite-bearing lherzolite mantle by partial melting , the degree of partial melting is respectively 3.5 % and 4.3 % about .