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碎屑锆石
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  detrital zircon
     Six detrital zircon grains from the Proterozoic Yongning Formation were measured using this method and ~(207)Pb/~(206)Pb ages of 1965~2590 Ma were obtained.
     应用该方法测定了元古代永宁组沉积岩的碎屑锆石,获得6颗锆石的207Pb/206Pb年龄值为1 965~2 590 Ma。
短句来源
     (2) the captured sedimentary detrital zircon has an appearance 207Pb/208Pb age of 1823±68Ma, suggesting that the basal Changcheng System be younger than 1823Ma;
     (2)捕获锆石,多为原碎屑锆石,较年轻的一种捕获锆石的207Pb/206Pb表面年龄为1823±68Ma,这限定了长城系底界年龄应新于1823Ma;
短句来源
     U-Pb isotopic ages of 61 detrital zircon grains from the sillimanite-biotite-quartz schist of the Qinling Group in the North Qinling metamorphic terrane are reported in this paper. Of the 61 zircon grains, 15 were measured by SHRIMP Ⅱ, and 46 by LA-ICPMS.
     报道了北秦岭地块中秦岭岩群夕线黑云石英片岩61个碎屑锆石测点的207Pb/206Pb年龄测试结果,其中15个测点在SHRIMPⅡ上进行,46个测点来自LA-ICPMS的测定结果。
短句来源
     906±24 Ma for the granitic gneiss intrusion is, which should be the product of the global Grenville (Sibaoan) collisional orogeny occurring around 1000 Ma BP. In addition, an inherited detrital zircon age of 2702±13 Ma was also obtained, which is the oldest age in the Yunkai area and even in Cathaysia, proving the presence of Neoarchean continental crustal material in Cathaysia.
     获得花岗质片麻岩的侵入年龄为906Ma±24Ma,应为1000Ma前后发生的全球性Grenville期(四堡期)造山作用的产物,并获得2702Ma±13Ma的继承碎屑锆石年龄,这是云开地区乃至华夏古陆目前获得的最古老年龄,证明华夏古陆曾存在新太古代陆壳物质。
短句来源
     The detrital zircons from the sedimentary rocks were dated through SHRIMP and LA-ICP-MS. The result shows that the detrital zircon U-Pb ages concentrate in 1400 to 600Ma, especially 900-700 Ma,which was the most intensive crustal growth stage in western margin of the Yangtze block. But, tectonic and magmatic events of 1000-700Ma have not been identified yet in North China block.
     通过SHRIMP和LA-ICP-MS对研究区碎屑锆石进行了U-Pb定年研究,分析结果表明锆石U-Pb年龄集中于1400-600Ma,特别是900-700Ma,这一时间段正是扬子板块西缘强烈增生的主要阶段,而华北板块没有相应的年龄记录。
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  detrital zircons
     Metamorphosed detrital zircons from them yield two discordia with upper intercepts of 2.80±0.11 Ga and 2.03±0.05 Ga, respectively.
     变泥砂质岩石给出 2 .80± 0 .11Ga和 2 .0 3± 0 .0 5 Ga两组 (变质 )碎屑锆石年龄数据。
短句来源
     All the analyzed zircons retain inherited detrital cores with inherited ages (206Pb/238U age) of 313 -659 Ma, indicating that the detrital zircons of the protolith have a variety of sources, and partial loss of Pb from some zircons in the protolith.
     继承性碎屑锆石核部的年龄(206Pb/238U的年龄)为313-659Ma,表明原岩继承性碎屑锆石来源的复杂性,以及部分碎屑锆石在超高压变质过程中发生不完全重结晶,导致年龄变新;
短句来源
     Most detrital zircons show heavy Pb loss. Five data points near the upper intercepts yield a weighted mean 207Pb/206Pb age of 3399±8 Ma, representing the age of the sedimentary source.
     碎屑锆石普遍存在强烈铅丢失,靠近上交点的5个数据点207Pb/206Pb加权平均年龄为3399Ma±8Ma,代表了物源区组成的时代。
短句来源
     SHRIMP U-Pb Geochronological Research on Detrital Zircons from the Beidahe Complex-Group in the Western Segment of the North Qilian Mountains, Northwest China
     北祁连山西段北大河岩群碎屑锆石SHRIMP U-Pb年代学研究
短句来源
     Some zircons from paragneiss retain inherited cores with inherited ages of 345~743 Ma, indicating the complexity of the detrital zircons in protoliths.
     其中副片麻岩锆石核部记录了345~743 Ma的继承性锆石年龄,标志着原岩碎屑锆石来源的复杂性;
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  “碎屑锆石”译为未确定词的双语例句
     The age of 2142—2589 Ma for the elastic zircon from the volcanic rocks indicates that there possibly exist an early Proterozoic or Archean basement in the surveyed area and adjacent region, which is of important significance for recognizing the basement of southeastern continental margin in China.
     火山岩中2142—2589Ma的碎屑锆石年龄表明,本区或邻近地区有更老的早元古代甚至太古宙基底岩石,这对于认识中国大陆东南缘基底具有重要意义。
短句来源
     The results indicate that 51 zircon grains were derived predominantly from late-Palaeoproterozoic to early Mesoproterozoic continental crust, with ages ranging from 1.5 to 1.9 Ga. One zircon grain yielded a Neoarchean age, 5 grains derived from the erosion of the late-Mesoproterozoic rocks, and 4 grains yielded ages of about 0.9-1.0 Ga.
     61个年龄值显示锆石主要来源为1·5~1·9Ga(共51个测点,占所有测点的83·6%)的古元古代末至中元古代早期的大陆地壳,1粒碎屑锆石来自新太古代岩石,5粒来自中元古代晚期的蚀源区,4个测点为0·9~1·0Ga。
短句来源
     The U-Pb age of clastic zircons from ore-bearing sandstone is 283±67Ma, which is corresponding to the age of gneissic granite of the provenance area indicating the material source of uraniferous sandstone.
     赋矿地层西山窑组(J_(2x))砂体碎屑锆石U-Pb等时线年龄为283±67Ma,证实花岗岩侵入体是含矿砂体的主要物质来源。
     The CL images reveal that prismatic and oscillatory-zoned zircons with Th/U>0.38 are dominant in the leucoleptite of the Wanzi Group and interpreted as detrital magmatic zircons with igneous rocks as their protoliths.
     阴极发光 (CL )图像显示浅粒岩中的锆石主要为具有震荡环带的岩浆型碎屑锆石 ,其 Th/ U >0 .38,表明原岩主要为火成岩。
短句来源
     The facts that the youngest U-Pb age (725Ma) of detritus zircons from the biotite-granulitite and that metamorphism occurred at the Caledonian or earlier than the Caledonian Period suggest that the original sedimentary rocks of metamorphic rocks may have deposited at Early paleozoic.
     根据黑云母变粒岩中单颗粒碎屑锆石最小U-Pb年龄为725Ma以及加里东期或早于加里东期变质的事实,原岩的沉积时间为早古生代。
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  detrital zircon
Fission-track dating of zircon showed that sandstones from this zone contain detrital zircon of several different-age populations.
      
Thus, results of dating of detrital zircon grains from sandstones, which did not experience heating above 215-240°C, indicate that this method is appropriate for dating fossil-free terrigenous sequences.
      
SHRIMP U-Pb analyses of detrital zircon: a window to understanding the Paleoproterozoic development of the Tanami Region, northe
      
Dating of detrital zircon from six of the principal sedimentary units shows that deposition spanned at least the period ~1.84-1.77?Ga.
      
Collectively, the detrital zircon ages reveal a progression in provenance that is a record of the development of the orogen.
      
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  detrital zircons
Age of Detrital Zircons from Sandstones of the Mesozoic Flysch Formation in the South Anyui Suture Zone (Western Chukotka)
      
This work presents first data on age estimates of detrital zircons from Upper Mesozoic terrigenous sequences of the South Anyui suture zone obtained by the fission-track method.
      
The fission-track dating showed that sandstones from the flysch sections contain detrital zircons of two different-age populations.
      
The U-Pb dating of zircons from the metadacites and detrital zircons from the metagraywackes of the Kalikorva structure yielded similar ages of 2785 ± 13 and 2766 ± 21 Ma, respectively.
      
This paper presents the results of structural, lithologic, and geochronological (K-Ar, Rb-Sr) studies of the Carnian terrigenous rocks in the sedimentary cover of the Chukchi microcontinent and U-Pb dating of detrital zircons.
      
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During 1984-1986, the authors discovered a suite of slightly metam-orphosed rock series overlying the Zhoujiahe Formation of Shuiyuesi Group of Lower Proterozoic Erathem with angular unconformity around the Xiongjiapo-Kongzihe and Shashuya-Xichahe on the northern margin of Huangling faulted dome. The intersection acute angle of the stratig-raphical strikes is 22°and the dips are opposite. On the unconformity interface the metamorphosed sandy conglomerates and de-metamorphism-superposition schistosity belt are...

During 1984-1986, the authors discovered a suite of slightly metam-orphosed rock series overlying the Zhoujiahe Formation of Shuiyuesi Group of Lower Proterozoic Erathem with angular unconformity around the Xiongjiapo-Kongzihe and Shashuya-Xichahe on the northern margin of Huangling faulted dome. The intersection acute angle of the stratig-raphical strikes is 22°and the dips are opposite. On the unconformity interface the metamorphosed sandy conglomerates and de-metamorphism-superposition schistosity belt are seen. In the lower part of this suite of slightly metamorphosed rock series, the chlorite-sericite quartzose schist is interbedded with chlorite-sericite schist. The protolith(pro-tolyte) is flych-like formation metamorphosed by regional dynamic ac-tion, and the metamorphic rank is low-greenschist facies, 1045 meters thick, in the upper, part, the metamorphosed feldspar-quartz-sandy conglomerate and sandstone are interbedded with sericitic phyllite, with slightly dynamic metamorphism. The protolith is the sediments of con-tinental clastic shallow-sea facies, more than 1225 meters thick. the lower part of this suite of slightly metamorphosed rock series is named Xichahe Formation and the upper part, Kongzihe Formation, which comprise the basement of Pre-Sinian Period in the present area. Intruded by a few intermediate-basic dikes and not having undergone regional migmatization, the morphology of the structure is simple, containing rich micropalaeobotany, especially the members often seen in lower-subgroup of Shennongjia Group: Asperatopsophosphaera umishanen-sis Trachysphaeridium sp., etc. in Wudangshan Mt. By the uniformity curve method of U-Pb in zircon, the geological age reflected by the first heat event of accretion-clastic zircon of Xichahe Formation is da- ted 1683 Ma, thus, Xichahe Formation and Kongzihe Formation belong to Middle Proterozoic Era and their horizons are at the bottom of lower subgroup of Shennongjia Group. Their angular unconformity relationsh-ip to the underlying Shuiyuesi Group is named Xingshan movement with time range from 2000 to 2500 Ma, representing an orogeny of miogeosyn-cline caused by regional. metamorphism and folding in Huangling-Shen-nong area during Early Proterozoic Era.

黄陵断隆北缘发现一套浅变质岩系,以角度不整合覆于下元古界水月寺群中深变质岩系之上,该浅变质岩系原岩为陆源浅海相沉积,自上而下新建两个组,分别命名为孔子河组和西汊河组,均含较丰富的微古植物化石,共13属17种,如:雾迷山糙面球形藻Asperatopsophos-phaera umishanensis,粗面球形藻Trachysphaeridium sp.等为神农架群下亚群的常见分子,西汊河组获得碎屑锆石最早变质年龄为1683ma,地质时代归属中元古代早期。层位置于神农架群下亚群下部,与下元古界呈角度不整合关系,命名为兴山运动,时限2000ma左右,代表黄陵——神农地区早地槽阶段的一次重要褶皱运动。

This paper reports on the geochronological study of Precambrian metamorphic basement in Northern Fujian, in which the single zircon U-Pb dilution method, hornblende ~(40)Ar/~(39)Ar and whole rock Sm-Nd methods are used and many significant geochronological data are gained from the Mayuan Group and Mamianshan Group (Precambrian). It is inferred that the intensive magma tectonothermal events occurred for 1 850 Ma in the Fujian-Zhejiang metamorphic basement, which result in the emplacement of granitic magma. The...

This paper reports on the geochronological study of Precambrian metamorphic basement in Northern Fujian, in which the single zircon U-Pb dilution method, hornblende ~(40)Ar/~(39)Ar and whole rock Sm-Nd methods are used and many significant geochronological data are gained from the Mayuan Group and Mamianshan Group (Precambrian). It is inferred that the intensive magma tectonothermal events occurred for 1 850 Ma in the Fujian-Zhejiang metamorphic basement, which result in the emplacement of granitic magma. The age 1 850 Ma can be defined as the upper limite age of the Mayuan Group. The age of Mamianshan Group is 1100—1430 (?) Ma and its metamorphic age is less than 1100Ma. During 774—870 Ma and 426—458 Ma (equivalent to Jinning Movement and Caledonian Movement, respectively)there occurred the two superimposed tectonothermal events in the Northern Fujian metamorphic basement, which show up the reformation of basement rocks by the migatization and/or deformation and magmatic activity. The age of 2142—2589 Ma for the elastic zircon from the volcanic rocks indicates that there possibly exist an early Proterozoic or Archean basement in the surveyed area and adjacent region, which is of important significance for recognizing the basement of southeastern continental margin in China.

本文在对闽北前寒武纪基底岩石进行较详细研究的基础上,以单颗粒锆石U-Pb稀释法为主,配合角闪石~(40)Ar/~(39)Ar法和全岩Sm-Nd法,获得了麻源群和马面山群及其有关岩石的大量年代学信息。研究表明,闽浙变质基底于1850Ma左右发生了强烈的岩浆构造热事件,导致花岗质岩浆的侵位,这一年龄可做为麻源群岩石的年龄上限。马面山群的年龄为1100—1438(?)Ma,变质年龄略小于1100Ma。测年结果表明,闽北变质基底在774—870Ma和426—458Ma时曾发生过两次叠加构造热事件,表现为岩石的混合岩化作用和/或变形作用以及岩浆活动等基底岩石的改造作用,这两个时期分别相当于晋宁运动和加里东运动。火山岩中2142—2589Ma的碎屑锆石年龄表明,本区或邻近地区有更老的早元古代甚至太古宙基底岩石,这对于认识中国大陆东南缘基底具有重要意义。

Ion microprobe U- Pb analyses of zircons from the Sino-Korean craton have identified remnants of≥3800 Ma crust at two localities-near Caozhuang east of Beijmg,and near Anshan,northeast China,Near Caozhuang,the detrital zircons in an Archean metaquartzite are 3550 Ma or older;about one-fourth have ages beween 3 800 and 3 850 Ma.The ages for detrital zircons with concor-dant U-Pb ages form a polymodal distribution, interpreted to show that the detritus that formed the quartzite was derived from a terrane containing...

Ion microprobe U- Pb analyses of zircons from the Sino-Korean craton have identified remnants of≥3800 Ma crust at two localities-near Caozhuang east of Beijmg,and near Anshan,northeast China,Near Caozhuang,the detrital zircons in an Archean metaquartzite are 3550 Ma or older;about one-fourth have ages beween 3 800 and 3 850 Ma.The ages for detrital zircons with concor-dant U-Pb ages form a polymodal distribution, interpreted to show that the detritus that formed the quartzite was derived from a terrane containing early Archean rocks of several ages.Near Anshan,sheared gneiss is present in a complex containing ca.3300 and 3000 Ma granites,Some ̄(207)Pb/ ̄(206)Pb age of 3 804±5 Ma(2σ),interpreted to be the age of the protolith of the gneiss.

用离子探针质谱测定锆石微区年龄方法,发现了中国冀东铬云母石英岩小碎屑锆石年龄为3.35-3.85Ga;鞍山地区花岗质糜棱岩中锆石年龄为3.8Ga。

 
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