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锆石u
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  zircon u
     The Sm Nd isochron age of grey gneiss and cpi crustal rocks is (2830.2±79.7) Ma,and the zircon U Pb age of the red gneiss is 2 059±14 Ma.
     灰色片麻岩、表壳岩组合的Sm-Nd全岩等时线年龄(2830.2±79.7)Ma,红色片麻岩锆石U-Pb年龄(2059±14)Ma。
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     Single zircon U Pb, 40 Ar / 39 Ar,Sm Nd and Rb Sr isochron ages suggest that the greenstone belt was formed 2700—2800 Ma ago. The ages of three types of syntectonic granites associated with the greenstone belt are (2555±35)Ma,(2515±4)Ma and 2505—2400Ma,respectively.
     单颗粒锆石UPb、40Ar/39Ar、SmNd和RbSr等时线年龄表明绿岩带形成时代为2700~2800Ma,三类同构造期花岗岩的形成时代分别为(2555±35)Ma、(2515±4)Ma和2500~2400Ma。
短句来源
     Precambrian basement age and characteristics of Southwestern Tianshan: Zircon U Pb geochronology and Nd Sr isotopic compositions.
     西南天山前寒武纪基底时代和特征:锆石U-Pb年龄和Nd-Sr同位素组成
短句来源
     The Bainhalatu suits, however, have strong contrast between LREE and HREE, an important negative Eu abnormality and a single zircon U Pb age of 363Ma, and are typical of high SiO 2, K 2O, Rb and low CaO, FeO, MgO, Co, Sr.
     后者主要由花岗闪长岩、二长花岗岩和钾长花岗岩组成,化学成分以富SiO2、K2O、Rb和贫CaO、FeO、MgO、Co、Sr为特征,轻重稀土较强分馏,负铕异常明显,单颗粒锆石U-Pb同位素年龄为363Ma。
短句来源
     The Geladandong intrusive body mainly consists of monzonitic granite, with the single zircon U_Pb age being 40±3 Ma, the Rb_Sr isochron age of the rock being 47±0.4 Ma, and the K_Ar ages of plagioclase, hornblende and biotite being 37.1 Ma, 45.8 Ma, 48 Ma, respectively. The rock body was formed in Eocene.
     羌塘中部各拉丹冬岩体主要由二长花岗岩组成,其单颗粒锆石U-Pb年龄为40±3Ma,Rb-Sr等时线年龄为47±0·4Ma,斜长石、角闪石、黑云母K-Ar年龄分别为37·1Ma、48Ma和45·8Ma,形成于始新世。
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  “锆石u”译为未确定词的双语例句
     Zircon U-Pb age is 274+4Ma.
     锆石U-Pb法同位素年龄为274+4Ma。
短句来源
     The Zircon U-Pb dating gives results of 226.5±2.9 - 234.2±2.3 Ma, indicating that it belongs to Late Triassic.
     其锆石U-Pb年龄为226. 5±2. 9~234. 2±2. 3Ma,为晚三叠世。
短句来源
     The zircon U-Pb SHRIMP dating yields an age of 281±4Ma, and ~(40)Ar-~(39)Ar isochron age is 236.1±1.2Ma.
     其锆石U-PbSHRIMP年龄为281±4Ma,黑云母40Ar-39Ar等时线年龄为236.1±1.2Ma。
短句来源
     U-Pb age of Zircon is 267.1 Ma.
     同位素测年(锆石U-Pb法)为267.1Ma。
短句来源
     Zircon U-Pb dating yields 219. 6±0. 9Ma, which suggests that it was produced in the Indosinian magmatism event.
     单颗粒锆石U-Pb定年结果为219.6±0.9Ma, 属于印支期岩浆活动产物。
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  相似匹配句对
     Zircon not equal to diamond
     锆石≠钻石
短句来源
     A STUDY ON THE CODING OF ZIRCON CRYSTAL FORMS
     锆石晶形的编码研究
短句来源
     Preliminary Analysis of Discordant Reason of Zircon U-Pb Dating
     锆石U-Pb年龄不一致原因浅析
短句来源
     THE SINGLE ZIRCON U-Pb DATING METHOD
     微量及颗粒锆石U-Pb定年方法
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  zircon u
Geochemical characteristics and zircon U-Pb isotopic ages of island-arc basic igneous complexes from the Tianshui area in West Q
      
By means of the single-zircon U-Pb isotopic method, the intrusion age is reported in this paper, which is (151.7±1.6) Ma for a patched granite body (the source granite for Nb-Ta).
      
2 700 Ma, which well agrees with zircon U-Pb dating of previous studies.
      
Conventional single-zircon U-Pb dating: Comparison with shrimp technique applied to proterozoic rocks of the Zhongtiao Mountains
      
Zircon U-Pb geochronology of the Dabie-Sulu orogenic belt
      
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This paper brings about U-Pb and Rb-Sr isotopic age datawhich are known as the oldest geological ages in this province.The author interpreted the data on the basis of isotopic chro-nology integrating with the study of mineralogy.It is thoughtthat the model age of zircon given by the lower intersection pointon U-Pb coincident curve reprecents the age of sedimetation (643 m·y),while the isotime age of the whole rock given by Rb-Srmeasurement(606 m·y) is the result of recrystallization duringdiagenesis.This conclusion...

This paper brings about U-Pb and Rb-Sr isotopic age datawhich are known as the oldest geological ages in this province.The author interpreted the data on the basis of isotopic chro-nology integrating with the study of mineralogy.It is thoughtthat the model age of zircon given by the lower intersection pointon U-Pb coincident curve reprecents the age of sedimetation (643 m·y),while the isotime age of the whole rock given by Rb-Srmeasurement(606 m·y) is the result of recrystallization duringdiagenesis.This conclusion is in accordance with previous geolog-ical inferrence.According to the geological and isotopic datingdata obtained,the author also correlated this suit of strata withthose in other parts of the same province and the typical sectionof Sinian system in East Gorges area of Yangtze River,anddiscussed the chronological attribution of it.It is consideredreasonable to put the Late precambrian strata of volcanic rock,pyroclastic rock and the intercalated beds of argillosilic-ferriccarbonate rock in this province to the position of upper Sinianseries as for more preciseness.The recognition of the indicativeassociation of pyrite,marble and silicilith provided reliablefoundation for the division and correlation of this suit of strata.

本文应用 U—Pb、Rb—Sr 同位素测定年龄手段,获得了迄今为止我省最大的同位素地质年龄。作者应用同位素地质年代学原理并结合矿物学方面的研究,对所获得的同位素数据进行解释,认为所获得的锆石 U—Pb—致曲线法下交点模武年龄(643百万年)为该地层沉积年龄,而全岩 Rb—Sr 法给出的等时线年龄(606百万年)为该地层晚期成岩重结晶年龄。这一成果的解释与地质上推断的时代相当吻合。从所获得的地质资料并以同位素年龄作为时代划分依据,对省内区域上地层对比并与峡东震旦系标准剖面比较,讨论了该套地层的时代归属。作者认为本省晚前寒武系这套火山岩、火山碎屑岩及其所夹的泥硅铁质、碳酸盐岩沉积,其时代归属为震旦系上统为宜。该套地层中部的黄铁矿层、大理岩、硅质岩三者相伴生的标志层位的建立,为该地层的划分对比提供可靠的依据。

The Archaean Jining Group, of dominant granulite fades metamorphism, is stratigraphically the oldest metamorphic rock series in the south Nel Mongol of China.According to the metamorphic rock assemblages and rock chracteristics, the Jining Group can be subdivided into two rock formations.The lower part of the lower formation is mainly composed of pyroxene-plagioclase-granulite, intercalated with biotite hypersthene-plagioclase-gneis-ses, pyroxene-bearing plagioclase-amphibolite and pyroxenite, the upper part...

The Archaean Jining Group, of dominant granulite fades metamorphism, is stratigraphically the oldest metamorphic rock series in the south Nel Mongol of China.According to the metamorphic rock assemblages and rock chracteristics, the Jining Group can be subdivided into two rock formations.The lower part of the lower formation is mainly composed of pyroxene-plagioclase-granulite, intercalated with biotite hypersthene-plagioclase-gneis-ses, pyroxene-bearing plagioclase-amphibolite and pyroxenite, the upper part of the same formation mainly consists of hypersthene-(garnet ±) biotite-pla-gioclase-gneisses, intercalated with pyroxene-plagioclase granulite, and occasionally also thin-beded pyroxene-bearing magnetite-quartzite. The protoliths correspord to those of a basic-intermediate (-acidic) volcanic-sedimentary formation. The upper formation of this group is mainly composed of sillimanite-garnet-K-feldspar- (or two feldspars) gneisses, biotite-plagioclase-gneisses, garnet-quartzite, diopside-marble, and leuco-leptite, intercalated with pyroxene plagioclase-granulite in the lower part and with a graphite ore bed of several meters thick, in the basal part. The protoliths are those of a graphite-bearing semipelitic-cart onate formation, which is similar to these of the Khondalitic rocks of India.The U-Pb zircon and Rb-Sr whole rock iscchron method have been applied to dating this group.Cn the six U-Pb zircon and two Rb-Sr whole rock isochion results, con-bired with geologic features of this group, conclusions have been made as follows:★★★1. Zircon discordent dating for biotite-bearing hornblende-plagioclase-gne-iss of this group gives an age of 2467-35+54Ma. It is the oldest dating that has been obtained so far in this group. This result can be interpreted as the minimum age for late Archaean metamorphic event which may be correlated with the same event recognized in the Qianxi Group, eastern Hebei.★★★2. The lower limit of metamorphic age for the upper formation of the Jining Group seems to be older than 2316 Ma. (Rb-Sr) or 2359 Ma (U-Pb, allanite).★★★3. The other three zircon discordent data for gneisses and amphibolite of the upper formation from this goup give the ages of 1821, 1962 and 1957 Ma. They are interpreted as the age of early Proterozoic metamorphic event which is super-imposed on the late Archaean metamorphic event. The formation of the rather widespread pegmatites in this terrain is closely related to this metamorphic event.★★★4. The age of protolith of Jining Group should be older than 2500 Ma.

集宁群变质岩系按其岩性共分上、下二个岩组;下岩组以二辉斜长麻粒岩,紫苏斜长片麻岩为主,原岩为基性-中酸性火山岩-沉积岩建造;上岩组主要由硅线石榴钾长片麻岩,透辉石大理岩等组成,原岩为含碳半粘土质岩及碳酸盐建造。变质程度已达麻粒岩相,形成温度800—900℃,压力(8-10)×10~8Pa。采用锆石U-Pb法和全岩Rb-Sr法进行变质岩的年龄测定文中介绍了集宁群上、下岩组锆石原岩样和锆石的特征以及年龄的测定方法、测定的原始数据并对测得结果进行了讨论。得出集宁群的最大年龄值为2467±_(25)~(54)Ma(下岩组),经综合分析,集宁群可有二个明显的变质期:晚太古期和早元古期二期变质作用、岩浆活动与华北克拉通其他地区可进行对比。

The Shipaihe "metadiorite mass" occurring in Dengfeng County, Henan Province, is a complex igneous mass which has been comtaminated with old rocks at depths and has undergone alkaline metasomatism after emplacement. Its petrochemical composition varies from monzonite to diorite. The total content of REE (3 sample)ranges from 378.43 to 488.05, and no Eu anomaly is shown. Eu/Eu = 0.77-0.88.The chondrite-normalized REE distribution of the rocks shows a high fractionated pattern. LREE is predominant. The age of...

The Shipaihe "metadiorite mass" occurring in Dengfeng County, Henan Province, is a complex igneous mass which has been comtaminated with old rocks at depths and has undergone alkaline metasomatism after emplacement. Its petrochemical composition varies from monzonite to diorite. The total content of REE (3 sample)ranges from 378.43 to 488.05, and no Eu anomaly is shown. Eu/Eu = 0.77-0.88.The chondrite-normalized REE distribution of the rocks shows a high fractionated pattern. LREE is predominant. The age of emplacement of this igneous mass is about 2520 + 17Ma, (zircon U-Pb) belonging to the Late Archaean.

本文主要对河南登封石牌河“变闪长岩体”的岩石学、岩石化学、稀土元素地球化学和同位素年代学进行了初步研究和讨论。初步认为该岩体不是一个成分单一的岩体,而是由二长岩—闪长岩组成的较复杂岩体、并曾受到后期钾化。三个稀土元素模式图十分一致,说明属同一系列的岩体。图上显示轻稀土明显富集,无负Eu异常,∑REE为378.43—488.05。Eu/Eu~*=0.77—0.88。岩石中锆石的U-Pb一致曲线上交点年龄为2520±17Ma,代表了岩体侵位和结晶的时代。

 
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