石榴石

Based on the petrological and geochronological study of metamorphic complexes from the Grove Mountains, the following conclusions are reached.(1)Exsolution texture is widely found in clinopyroxene in mafic granulites. A peak metamorphic temperature of 850 C was obtained from the reintegrated compositions of exsolved clinopyroxene. The preservation of augite megacrysts suggests a single episode of high-grade metamorphism for the Grove Mountains.(2)The compositional comparison of garnet from pegmatites with that from country rocks demonstrates that garnet in pegmatites is of xenocryst origin, and late amphibolite facies metamorphism does not occur in this area.(3)The Pan-African charnockite and post-tectonic sheet-like granite were first recognized in East Antarctica. Their occurrences suggest a collisional orogeny during the Pan-African time.(4)The SHRIMP U-Pb zircon dating on various rock types indicates that the major metamorphism in the Grove Mountains occurs at c. 550 Ma, and the tectonothermal evolution terminated at c. 500 Ma. The Grenvillian granulite facies metamorphism did not develop in the studied area.(5)The Prydz belt, the second Pan-African suture within the Gondwana suppercontinent, was further comfirmed based on this study. The Gondwana suppercontinent was not formed by the simply juxtaposition of East and West Gondwana, but by the collision of several blocks during the Pan-African time.

本项目通过格罗夫山地区高级变质杂岩的变质岩石学和同位素年代学研究，获得如下重要认识：（1）发现辉石出溶结构，由此获得峰期变质温度为850 C，并根据火成普通辉石的识别确定该区只存在单相麻粒岩相变质；（2）通过伟晶岩中石榴石斑晶与围岩中石榴石的对比研究提出了石榴石的捕虏晶成因，进而确定该区不存在晚期角闪岩相变质作用；（3）在东南极首次识别出泛非期紫苏花岗岩和后构造层状花岗岩，为泛非构造热事件的碰撞造山成因提供了重要佐证；（4）对不同岩石类型的锆石SHRIMP定年精确地限定了格罗夫山地区主期变质作用发生于泛非期，～550 Ma，热事件结束于～500 Ma，年代学数据没有揭示在该区存在格林威尔期麻粒岩相变质作用的迹象；（5）进一步确认了东南极内部普里兹带的存在，它属于冈瓦纳超大陆内部的第二条泛非期缝合带，据此认为冈瓦纳超大陆并不是由东、西冈瓦纳陆块的简单拼合而成，而是多个不同块体拼合的结果。

Well-documented Lu-Hf isotope data from the oceanic basalts show that,the starting area of magma melting for the MORBs derived from the DMM component would be in the the depth of garnet peridotite,i.e.at the depth of 80―90 km instead of less than 60 km,which is at the depth of spinel peridotite as proposed early.The HIMU component,which is characterized by its high rediogenic lead,is refered as a special mantle component differentiated at some time in geological history from the lower mantle.A correlation study of Hf-Nd isotope between the chondrite and oceanic basalts implies that no isolated primitive mantle might have remained.

大量的大洋玄武岩Lu-Hf同位素研究表明：具亏损地幔端元来源的洋中脊玄武岩岩浆部分熔融的初熔区位于石榴石稳定场深度，即深度为80-90 km的石榴石二辉橄榄岩地幔，而不是原来所认为的尖晶石二辉橄榄岩区(深度小于60 km)；以高放射成因Pb为特征的高U地幔端元应代表了下地幔物质在某一特定时期发生分异作用的结果；球粒陨石与大洋玄武岩Hf同位素对比研究表明，没有原始地幔物质能保留至今的迹象。

On the basis of petrography and mineral chemistry of the xenoliths, the amphiboles in them can be subdivided into four kinds of occurrences ,i.e., 1 the early amphibole inclusions within garnet, being maganesio-hornblende; 2 the primary amphiboles equilibrated with omphacite and garnet in eclogite, belonging to pargasite and pargasitic hornblende; 3 the retrograde amphiboles around garnet and clinopyroxene, mainly being edenitic and actinolitic hornblendes; and 4 the exsolving amphiboles within clinopyroxenes, mainly being edenite, edenitic hornblende and/or ferroan pargasitic hornblende.

对该类捕虏体的岩相学和矿物化学研究表明，其中的角闪石具有4种产状：1位于石榴石中的早期角闪石包裹体，为镁质普通角闪石；2与榴辉岩中矿物平衡存在的原生角闪石，为韭闪石或韭闪石质普通角闪石；3位于石榴石和单斜辉石周边的退变角闪石，主要为浅闪石质和阳起石质普通角闪石；4沿单斜辉石解理分布的出溶角闪石，主要为浅闪石、浅闪石质角闪石和含亚铁韭闪石质普通角闪石。

The garnet-bearing andesite in the Aqikekule Lake area, northern Tibetan Plateau contains plenty of phenocrysts of garnet, plagioclase, hornblende and quartz.

中文摘要：阿其克库勒湖地区的石榴石安山岩含有石榴石，斜长石，角闪石和石英斑晶。

The conclusion is conformed by microprobe analysis, which also shows that the purplish-red type is higher in Cr while the brownish-red garnet is richer in Fe and Ti.

电子探针分析表明，紫红色的石榴石中含有较高的Cr，而褐红色的石榴石中则富含Fe和Ti。

The garnets in the granitic gneisses from southern Dabie mountain were characterized by riching in Fe and Mn, and pooring in Mg, differing from the garnets in the UHP gneiss and eclogite, which relatively riching Mg. But the plagioclase in the granitic gneisses from the northern Dabie mountain was relative high Ca contenents, their An is 25.2-27.9, within the oligoclase field.

石榴石总体以贫Mg富Fe和富Mn为特征，明显不同于榴辉岩及高压片麻岩中石榴石相对富Mg的情况；而北大别英云闪长质片麻岩中斜长石的钙含量相对较高，An为25.2-27.9，位于奥长石范围内，角闪石中Mg的含量较高，具有壳幔混合源的特征。

The application to the two types of gneisses from Shuanghe in the Dabie Mountains obtains the model temperatures of 695 to 930℃ for garnet and titanite from the paragneiss, and 560 to 750℃ for garnet and magnetite from the orthogneiss.

对大别山双河两种片麻岩所进行的模式温度计算得到副片麻岩中石榴石和榍石的模式温度为695～930℃，正片麻岩中石榴石和磁铁矿的模式温度为560～750℃。

"Cape ruby" is a common name for pyrope garnet found in South Africa;"Arizona ruby" and "Colorado ruby" are common names for pyrope garnet.

"海角红宝石"是一种常见的名称镁铝榴石石榴石在南非发现，"亚利桑那红宝石"和"科罗拉多红宝石"是通用名称的镁铝榴石石榴石。

The low-pressure andalusite sequence metamorphic belt includes biotite zone, garnet zone, staurolite zone, staurolite-andalusite zone, sillimanite zone and cordierite-sillimanite zone. It is calculated that the P-T conditions are 445～550℃, 0.2～0.6GPa for biotite zone, 480～566℃, 0.54± 0.22GPa for the garnet zone, 601±20℃, 0.8±0.25GPa for the staurolite zone, 540±20℃, 0.32± 0.05GPa for the staurolite-andalusite zone, 640℃, 0.43GPa for sillimanite zone, 740～800℃, 0.4～0.7GPa for the cordierite-sillimanite zone.

黑云母带的变质条件估计在445～550℃、压力在0.2～0.6GPa范围变化；石榴石带温度在480～566℃、压力在0.54±0.22GPa的范围；十字石带范围为601±20℃、0.8±0.25GPa；十字石-红柱石带为540±20℃、0.32±0.05GPa，而利632.4℃、0.785GPa，这个值不是红柱石的稳定范围，这可能是其早期中压变质条件；矽线石带的条件640℃、0.43GPa左右，由于其石榴石中有蓝晶石包体，因此其早期也可能有中压条件的变质；堇青石-夕线石带范围大致为740～800℃、0.4～0.7GPa之间。

All of these characteristics indicate that the magma which produced the garnet clinopyroxenite was formed mainly by melting of the clinopyroxene from the mantle source with residual garnet. The phases of the rock before exhumation might have been clinopyroxene + garnet.

这些特点表明形成石榴单辉辉石岩的岩浆为地幔源区残留石榴石、主要熔出单斜辉石的高程度部分熔融的产物，折返前可能由单斜辉石＋石榴石相组成。

He knows that he's one of the mostdominant players in the NBA right now.

我知道他现在是联盟里最有统治力的球员之一了。

Using analysis method of BCG , the dissertation analyzed the management of voluntary service organizations .

利用BCG分析方法对我国的志愿服务组织管理进行了分析。