查询词典 zircons

2The studies on the appearance typomorphism, physical typomorphism, inner structure typomorphism and chemical typomorphism of the zircon and garnet, and the result of U-Pb isotopic age dating of zircon indicate that the zircons are meta-morphogenic genesis but two or three of them are magmatic genesis and most meta-morphogenic zircons have a basic magmatic zircon core which was generated in Stage of Yanshand and Indo-Chinese epoch. The genesis and origin of the garnet is very complicated. The garnets are main almandine with high Fe and Mg content and were proposed their souce rocks are mostly regional mid-degree-metamorphic rocks.

2研究锆石和石榴石的形貌标型、物性标型、内部结构标型以及成分标型特征和锆石U-Pb同位素测年结果表明，锆石除少数几个为岩浆锆石外，绝大多数是变质锆石，且中间多有形成于燕山-印支期的基性岩岩浆锆石残核；石榴石的成因及来源是比较复杂的，以铁铝榴石为主，且铁铝榴石中Fe、Mg的含量较高，推测其源区母岩主要以中级区域变质岩为主。

And even yonger ages for inherited detrital zircons and magmatic zircons of paragneiss.

副片麻岩中包含了730Ma、680Ma、621Ma和较年轻的继承性碎屑锆石和结晶锆石年龄。

SHRIMP analyses give 206Pb/238U ages ranging from 335～424 Ma for the zircons, showing a certain degree of radiogenic lead loss; so the age of 424±5 Ma reflects the minimum age of the metamorphic zircons.

SHRIMP分析表明，锆石206Pb/238U 年龄为335～424 Ma，有放射性成因铅丢失现象，因此可以推断424±5 Ma代表高压变质事件的最小年龄。

The results show that the zircons of the samples in deformative granite and massive granite of the Jiaoziding granites have internal oscillatory zoning; zircons of the Jiaoziding granites have higher Th/U ratios（0.521.23, 0.321.16）and are igneous in origin.

研究结果表明，轿子顶花岗岩体中变形花岗岩和块状花岗岩中锆石均发育岩浆韵律环带结构，具有较高的Th/U比值（052~123、032~116），为岩浆成因锆石。

According to the SHRIMP research of inherited zircons in the granitoid in Zhaoyuan-Laizhou area, it is showed that lots of different age′s inherited zircons are there.

招远—莱州地区花岗岩类锆石SHRIMP 研究表明，该区花岗岩类含有大量不同时代的继承锆石。

The U-Pb and Pb-Pb isotopic dating of zircons provided the ages of 447-462Ma representing the ages of peak granulitic metamorphism. The U-Pb dating of detrital zircons from aluminum-rich gneisses yielded older upper intercept ages which reflect the times of older materials derived from sourse rocks of the gneiss protoliths.

岩石中变质锆石的U-Pb及Pb-Pb同位素测定获得447-462Ma的年龄值，代表其麻粒岩相的变质作用时代，富铝片麻岩中含继承组分的锆石还获得较老的上交点年龄，它可能代表其沉积岩原岩源区的年龄。

On the basis of whole grain evaporation age on single zircons using a double filament for different genetic zircons in metalassenite and metarhyolite of Luoyu formation,Yunkai group,the formation age of volcanic rock is 922 Ma;later geologic events is 643 Ma￣716 Ma or 427 Ma￣473 Ma...

本文采用颗粒锆石分层蒸发法分别对云开群罗罅组变英安岩及变流纹岩中不同成因锆石进行年龄测定，获得该火山岩之形成年龄为922Ma，940Ma；后期地质事件年龄为643Ma～716Ma，427Ma～473Ma及物源区的年龄为1616Ma，2084Ma。

Methods Based on the analysis for the inner structural CL images of zircons, the U-Pb ages and Hf isotopes of zircons from the host granites, mafic microgranular enclaves and diorite dykes have been discussed using in situ zircon analysis of the LA-ICPMS and MC-ICPMS.

在锆石内部结构的CL图像研究基础上，用LA-ICPMS和MC-ICPMS测定锆石U-Pb年龄及Hf同位素组成，探讨寄主花岗岩、暗色闪长质包体及及围岩中闪长质脉体锆石U-Pb年代学及Hf同位素组成特征。

The zircon mineralogy and chronology of the eclogite show that a lot of primary inclusions of omphacite,phengite,garnet,bariosite etc.occur in the zircons,so the zircon should be formed during eclogite facies metamorphism.SHRIMP dating for zircons suggests the age of eclogite facies metamorphism range from 230 to 243Ma.

锆石矿物学和SHRIMP年代学研究表明，榴辉岩锆石中含有大量的绿辉石、多硅白云母、石榴子石、冻蓝闪石等矿物原生包裹体，锆石为榴辉岩相变质作用过程中从形成的变质锆石，锆石SHRIMP U—Pb年龄在230～243Ma之间，代表榴辉岩相变质作用的时代。

Many crustal zircons have the age (up to 2770Ma) that is much earlier than the formation of ophiolite considered by previous researchers, indicated the abundant subduction crust components occur in the zircons separated, which was preserved in the mantle, and outcropped with the mantle cycle process.

纯橄岩样品四个测点得到加权平均值为130.0±2.8Ma，属早白垩世，代表了纯橄岩的结晶年龄；研究中发现许多地壳成因的古老锆石(最老可达太古代2770Ma)，远远早于目前主流观点中蛇绿岩的形成时间中生代晚期，综合考虑认为所选锆石有大量俯冲地壳成分，在地幔中保存，后随地幔循环运移出露地表。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。