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   变质锆石 的翻译结果: 查询用时:0.021秒
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变质锆石
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  metamorphic zircon
     A compilation and comparison of reported zircon U-Pb ages of the Dabie mountains shows that ID-TIMS ages of metamorphic zircon of the ultrahigh pressure metamorphic rock range in 212 ~238Ma (av.225. 8Ma) , and SHRIMP average ages of individual samples range in 219 ~231Ma (av. 224.2Ma) , which are consistent well.
     大别山已报导的锆石U-Pb年龄数据的综合对比表明大别山超高压变质岩的变质锆石的ID-TIMS年龄变化范围为212~238Ma(平均值为225.8Ma),SHRIMP单个样品年龄平均值变化范围219~231Ma(平均值为224.2Ma),二者吻合得很好。
短句来源
     A SHRIMP U-Pb zircon age of 782±53 Ma was obtained for the magmatism emplacement, and an inherited metamorphic zircon age of 1837±14 Ma was obtained.
     通过SHRIMP锆石U-Pb年代学研究,获得玄武质岩石岩浆结晶年龄为782±53Ma,其形成时代为新元古代。 同时获得其中继承性变质锆石年龄为1837±14Ma。
短句来源
     PETROGRAPHICAL STUDY OF METAMORPHIC ZIRCON: BASIC ROLES IN INTERPRETATION OF U-Pb AGE OF HIGH GRADE METAMORPHIC ROCKS
     变质锆石成因的岩相学研究——高级变质岩U-Pb年龄解释的基本依据
短句来源
     Detailed comparative study on REE and Th/U ratio of inherited zircon cores and metamorphic zircon rims may provide important information on forming process of metamorphic zircons and physico-chemical environment when it forms.
     变质锆石的稀土元素和Th/U比可以为变质锆石形成时的物理化学环境和变质锆石成因提供重要信息。
短句来源
     Metamorphic zircon from Shuanghe ultra-high pressure eclogite,Dabieshan: ion microprobe and internal micro-structure study.
     大别山双河超高压榴辉岩中变质锆石:离子探针和微区结构研究
短句来源
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  “变质锆石”译为未确定词的双语例句
     The weighted average 206Pb/238U apparent age of 3 fractions of metamorphic zircons from intermediate-acid granulite is 221. 4±3. 6 Ma (concordia age), which indicates their crystallization age;
     中酸性麻粒岩中3个变质成因锆石的~(256)Pb/~(238)U表面年龄统计权重平均值(谐和年龄)为221.4±3.6Ma,是这些变质锆石较为准确的生成年龄;
短句来源
     Compared with the inherited and magmatic zircons, the metamorphic zircons have markedly lower Th/U ratios (0.54 on average).
     与残留锆石和岩浆锆石相比,变质锆石Th/U比值明显降低(0.54)。
短句来源
     The metamorphic zircons have a δ~(18)O value of 4.75‰, pointing to a protolith with less ~(18)O-depletd signature in the mantle-derived rocks.
     麻粒岩相变质锆石δ~(18)O值为4.75‰,氧同位素研究表明基性麻粒岩原岩具幔源性质,其原岩氧同位素组成未受到后期变质作用改造。
短句来源
     (2) low Zr/Hf ratio (35.92), significantly lower than the Zr/Hf rate of zircon in mafic protolith. Relatively elevated Hf concentrations and in turn decreased Zr/Hf ratios in these zircon inclusions suggest that they might formed at UHP metamorphic conditions.
     2Zr/Hf值约为35.92,比一般的基性原岩中的锆石的Zr/Hf值明显要低,这些特征说明它们很可能是形成在超高压条件下的变质锆石
短句来源
     The cathodoluminescene (CL) images and mineral inclusions from the eclogite reveal that there are two types of inherited zircons,one is magmatic origin with clear oscillatory growth zonation and another is metamorphic origin with relic garnet,hypersthene and plagioclase minerals of granulite-facies.
     根据阴极发光图像及矿物包体组合,罗田榴辉岩中继承锆石可分为两种即具有岩浆结晶环带的岩浆锆石和含有石榴子石+紫苏辉石+斜长石等麻粒岩相变质矿物包体的变质锆石,而且这两种继承锆石常具有舍石榴子石+绿辉石等榴辉岩相矿物包体的增生边。
短句来源
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  相似匹配句对
     metamorphic belt in China.
     变质带。
短句来源
     Coesite-bearing zircons from gneiss of North Qaidam yielded an UHP metamorphic age of 452±13. 8 Ma and a retrograde age of 419±6. 7 Ma.
     锆石的退变质年龄419±6.7 Ma。
短句来源
     Simple zircon and the smaller relict core in complex zircon are both of metamorphic origin.
     简单锆石和复杂锆石核部残留锆石均为变质成因;
短句来源
     Zircon not equal to diamond
     锆石≠钻石
短句来源
     Modification of Eutectic Silicon in Al-Si Cast Alloys
     共晶硅的变质
短句来源
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  metamorphic zircon
Metamorphic zircon from Xindian eclogite, Dabie Terrain: U-Pb age and oxygen isotope composition
      
The magmatic zircon has its Th/U ratio around 1.3 and decreasing with recrystallization, whereas metamorphic zircon has Th/U ratio of lower than 0.1.
      
Magmatic and metamorphic zircon domains all show very low oxygen isotopic compositions with average δ18O values of 1.8‰ and 2.8‰, respectively.
      
Three types of metamorphic zircon have been detected in the metamorphic rocks: the complex inclusion-bearing type ; the early relic zircon inclusion-bearing type; and the inclusion-free type.
      
The low Hf contents imply that the growth of metamorphic zircon involves a significant fractionation of the Zr/Hf ratio.
      
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The Hongqiyingzi Group in northern Hebei lies unconformably on the Archean folded metamorphosed basement rock series.Divergent views still exist as to its age assignment.Through an intensive analysis of more than 30 isotope age data obtainedby using different methods combined with a study of the geological setting,it is considered that the single grain detrital zirconU-Pb age of 2450(2434±23)Ma represents the maximum lower-limit age of formation of the Hongqiyingzi Group,while the UPb ages of metamorphosed...

The Hongqiyingzi Group in northern Hebei lies unconformably on the Archean folded metamorphosed basement rock series.Divergent views still exist as to its age assignment.Through an intensive analysis of more than 30 isotope age data obtainedby using different methods combined with a study of the geological setting,it is considered that the single grain detrital zirconU-Pb age of 2450(2434±23)Ma represents the maximum lower-limit age of formation of the Hongqiyingzi Group,while the UPb ages of metamorphosed zircon and zircon in granite are all about 2000(1978-2026)Ma,which is the upper-limit age of this group. Thus the authors hold that the time for the formation of the Hongqiyingzi Group in northern Hebei is in the range of 2450-2000 Ma;so the group should be assigned to the Lower Paleozoic.

冀北红旗营子群不整合于太古界褶皱变质基底岩系之上,对其时代归属尚存在不同认识。通过对使用不同方法和测定对象所获得的30余件同位素年龄数据,结合产出的区域地质背景深入的分析研究,认为单颗粒碎屑锆石U-Pb法2450(2434±23)Ma,代表红旗营子群生成的最大下限年龄;而变质锆石及花岗岩中的锆石U-Pb年龄均在2000(1978—2026)Ma,是该群的上限年龄。根据以上结论,冀北红旗营子群形成的时限为2450—2000Ma,因此将其归属于早元古代。

This paper presents a detailed study on the characteristics and U-Pb analysis of zircon from the granulite facies rocks in the Foping area in the southern Qinling Mountains. The weighted average 206Pb/238U apparent age of 3 fractions of metamorphic zircons from intermediate-acid granulite is 221. 4±3. 6 Ma (concordia age), which indicates their crystallization age; the upper and lower intercept ages of discordia constructed using 1 fractions of zircons are 822-272 Ma and 218±14 Ma respectively. A discondia line...

This paper presents a detailed study on the characteristics and U-Pb analysis of zircon from the granulite facies rocks in the Foping area in the southern Qinling Mountains. The weighted average 206Pb/238U apparent age of 3 fractions of metamorphic zircons from intermediate-acid granulite is 221. 4±3. 6 Ma (concordia age), which indicates their crystallization age; the upper and lower intercept ages of discordia constructed using 1 fractions of zircons are 822-272 Ma and 218±14 Ma respectively. A discondia line constructed through 4 fractons of zircons from garnet- sillimanite-biotite plagiogneiss defines an upper intercept age of 2283±162 Ma and a lower intercept age of 271±15 Ma. All the data points of the two samples are close to the lower intercept , so their upper intercept ages have no explicit geological significance. The granulite facies is Indosinian-late Hercynian(ca. 220-270 Ma), and this is the youngest granulite in the Qinling area.

对南秦岭佛坪地区麻粒岩相岩石中锆石的特征进行了详细的研究和U-Pb同位素年龄测定。中酸性麻粒岩中3个变质成因锆石的~(256)Pb/~(238)U表面年龄统计权重平均值(谐和年龄)为221.4±3.6Ma,是这些变质锆石较为准确的生成年龄;该样品4个锆石颗粒组成的不一致线上、下交点年龄分别为822±272Ma和218±14Ma;石榴夕线黑云片麻岩中4个锆石颗粒构成的不一致线的上下交点年龄分别为2283±162Ma和271±15Ma。两个样品的数据点均比较靠近下交点而远离上交点,其上交点年龄不具明确地质意义。综合各方面因素,认为麻粒岩相峰变质作用时代为印支期—海西晚期(220~270Ma左右),这是迄今为止秦岭地区所报道过的最年轻的麻粒岩地质体。

Two zircon ages were determined for U-Pb ion probe analyses from Lutushi(LTS) and Daoshicong(DSC) gneisses, Northern Dabie Terrain(NDT). Twenty U-Pb ages from thirteen zircon grains indicated that the ages for LTS gneiss are mainly ranged between 233~394Ma and DSC gneiss between 307~718Ma. The degree of concordance for DSC gneiss is better than that of LTS gneiss. Both gneisses show no age information below 220Ma. Since there were exits of discordances, these zircon ages probably represented mixing and overgrowth...

Two zircon ages were determined for U-Pb ion probe analyses from Lutushi(LTS) and Daoshicong(DSC) gneisses, Northern Dabie Terrain(NDT). Twenty U-Pb ages from thirteen zircon grains indicated that the ages for LTS gneiss are mainly ranged between 233~394Ma and DSC gneiss between 307~718Ma. The degree of concordance for DSC gneiss is better than that of LTS gneiss. Both gneisses show no age information below 220Ma. Since there were exits of discordances, these zircon ages probably represented mixing and overgrowth of ancient magmatic zircons with Triassic ultra-high pressure metamorphic and Cretaceous magmatic zircons. Those which were treated by Harker et al. as typical gneisses occurred in NDT may also be complex zircons which are formed in Precambrian magmatic zircons with late Cretaceous metamorphic zircons. Therefore, according to their U-Pb ages and distribution of zircons, one cannot conclude that all the gneisses from NDT were formed at Cretaceous. There may be two different age gneisses in NDT.

对北大别鹿吐石和道士冲二个片麻岩中锆石进行了离子探针 U- Pb年龄测定。二个样品 13个颗粒的 2 0个有效测定点的年龄表明 ,鹿吐石片麻岩主要分布在 2 33~ 394Ma,道士冲片麻岩在 30 7~ 718Ma之间。道士冲片麻岩年龄的一致性程度要高于鹿吐石 ,两个样品均无低于 2 2 0 Ma的年龄信息。由于存在年龄的不一致性 ,这些年龄可能代表了由古老岩浆锆石和三叠纪的超高压变质锆石或者早白垩纪岩浆锆石所代表的混合、增生锆石。 Harker等所认为是典型北大别片麻岩中锆石 ,实际上也是在前寒武纪形成的岩浆锆石基础上叠加白垩纪形成的变质锆石的一种复杂锆石。因此 ,根据锆石年龄分布来看 ,它并不代表这些片麻岩就是在白垩纪时形成的 ,北大别很可能存在二种不同时代的片麻岩。

 
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