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isotopic model age
相关语句
  同位素模式年龄
     Re Os isotopic model age of molybdenite and Rb Sr isochron dating identify mineralization epoch of Tongchang copper deposit were 889 Ma and 359 Ma, which correspond with post magmatic hydrotherm and regional dynamic metamorphism respectively.
     根据铜厂铜矿床辉钼矿ReOs同位素模式年龄和黄铜矿RbSr同位素等时线年龄分别为889Ma和359Ma,并依据其地质特征和与铜厂岩体之间时空关系,认为早期铜矿化发生在889Ma左右,与铜厂岩体岩浆期后热液有关; 晚期铜矿化则发生在359Ma左右,是伴随区域动力变质作用发生的;
短句来源
     Consistence between isotopic model age of lead ore and intrusion age of quartz porphyry shows close relations among structure movements,magmatism and mineralization in Stage of Yenshan.
     矿石铅同位素模式年龄和石英斑岩体侵入年龄的一致性反映燕山期构造、岩浆和成矿作用的密切关系。
短句来源
  “isotopic model age”译为未确定词的双语例句
     According to the Sm\|Nd isotopic model age for the quartz albitophyres and the formation of the subvolcanic rocks synchronogenic with or a little later than the volcanic rocks in this area, it is well defined that the volcanic rocks were formed in the Mid\|Cambrian period.
     第二期成岩年龄为 395 .80~ 40 2 .97Ma,形成时代为早泥盆世 ,依据石英钠长斑岩的 Sm- Nd模式年龄 ,并结合次火山岩的形成时代与该区火山岩同期或稍晚的关系 ,可确定该区火山岩的形成时代为中寒武世。
短句来源
  相似匹配句对
     model.
     模型。
短句来源
     Model.
     模型的适用范围。
短句来源
     Backstage Model
     后台模特
短句来源
     the isotopic method;
     古地磁法;
短句来源
     A CONTRIBUTION TO THE THREE-STAGE MODEL OF U-Pb ISOTOPIC SYSTEM
     U-Pb同位素体系的三阶段模式研究
短句来源
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Detailed geochemical studies of the Xi 'an tungsten ore deposit in west Hunan have been conducted with a diversity of geochemical approaches. As deduced from analyses of more than twenty kinds of trace elements and isotopie characteristics of C, 0 and Pb, the Banxi Group slate of great thickness is the source bed of the deposit. H and 0 isotopie compositions of water isolated from fluid inclusions show that the water in ore-forming hydrothermal solutions was derived mainly from heated formation water. Various...

Detailed geochemical studies of the Xi 'an tungsten ore deposit in west Hunan have been conducted with a diversity of geochemical approaches. As deduced from analyses of more than twenty kinds of trace elements and isotopie characteristics of C, 0 and Pb, the Banxi Group slate of great thickness is the source bed of the deposit. H and 0 isotopie compositions of water isolated from fluid inclusions show that the water in ore-forming hydrothermal solutions was derived mainly from heated formation water. Various phy-sico-chemical parameters for the hydrothermal solution have also been obtained from fluid inclusion studies.As deduced from Pb isotopic model age and whole-rock K-Ar age, the age of ore formation falls within the range of 500-600 Ma, suggesting that the Caledonian move-ment is a tectonic movement which had the greatest influence on the studied region. The principal ore-controlling factors are: stratum (source bed), lithologic character (carbo-nate host rock), and tectonics (Caledonian tectonic movement). The available evidence suggests that this deposit is a sedimentary-reworked strata-bound deposit.

使用微量元素、同位素和矿物包裹体等方法对湘西西安白钨矿矿床进行了较详细的地球化学研究。认为该矿床属于沉积-改造型层控矿床,并阐述了矿床的矿源层、成矿时代、成矿条件及控矿因素等问题。

The Shaoxing-Longquan oreforming zone of Zhe Jiang Province is one of the noble metalmetallogenic belts in southeastern China. In this belt, there are three types of gold depositts: (1)Zhilingtou (major ore-veins in early period) and Luoshan deposits related to the meta-sedimentaryrocks of Chencai Group; (2) Zhongao and Huangshan deposits related to the meta-volcanic rocks ofShuangxiwu Group and itscomagmatic or palingenetic magmatic rocks (also metamorphosed); (3)Babaoshan and Zhilingtou (minor ore-veins in...

The Shaoxing-Longquan oreforming zone of Zhe Jiang Province is one of the noble metalmetallogenic belts in southeastern China. In this belt, there are three types of gold depositts: (1)Zhilingtou (major ore-veins in early period) and Luoshan deposits related to the meta-sedimentaryrocks of Chencai Group; (2) Zhongao and Huangshan deposits related to the meta-volcanic rocks ofShuangxiwu Group and itscomagmatic or palingenetic magmatic rocks (also metamorphosed); (3)Babaoshan and Zhilingtou (minor ore-veins in late perjod) deposits related to the Mesozoic volcanicrocks. Most of the calculated lead isotopic model-ages for the gold deposits (1) and (2) range from500--750Ma close to the metamorphic age of the country rocks. Whereas, the model-ages rangingfrom 100--250Ma for the gold deposit (3) ate consistent with or olose to the forming age of thecountry rocks. In addition, most of the μ uvalues are relatively higher (≥9.5) and K(~(232)Th/~(238)U)values more than 4 in the gold (1), it is suggested that this lead mainly comes from the upper crust.In other deposits, most of the μ uvalues are lower (<9.5) and K values less than 4, it foilowsthat this lead maintl comes from the lower crust or the upper mantle. The gold deposits (1) and (2) have a relatively narrow range of δD values (-53~-62%),and positive δ~(18)O values (+1.0~+4.7‰), that indicates ore forming fluids mainly originatedfrom the syngenetic metawater. However, the gold deposit (3) has a wider range of δD values (-58~-73‰), and negative δ~(18)O values (-2.1~-4.9‰) similar to those of Mesozoic meteoricwater in southeastern China. There fore, this oreforming fluid mainly originated from the meteoricwater.

据浙江绍兴—龙泉成矿带主要金矿床中的41个铅同位素数据和28个氧、氢同位素数据资料,进行综合分析研究、着重探讨了金矿的物质来源和成矿流体的性质。

“Daoxiang Formation”,which geological time was thought to be accordant with late Sinian-Cam-brian,mainly emerges in Zhenghe,Daoxiang,Tieshan and so on.On the basis of the paragenetic associ-ation of rocks,petrochemistry,micropalaeontology,stable isotope and Sm-Nd isotopic model ages(T_(DM)~(Nd),800±50Ma.)of this set of low-grade metamorphic rock series,authors consider that “DaoxiangFormation” should belong to Dongyan Formation (intermediate-basic volcanic-fragmental sedimentaryformation) of early Sinian.According...

“Daoxiang Formation”,which geological time was thought to be accordant with late Sinian-Cam-brian,mainly emerges in Zhenghe,Daoxiang,Tieshan and so on.On the basis of the paragenetic associ-ation of rocks,petrochemistry,micropalaeontology,stable isotope and Sm-Nd isotopic model ages(T_(DM)~(Nd),800±50Ma.)of this set of low-grade metamorphic rock series,authors consider that “DaoxiangFormation” should belong to Dongyan Formation (intermediate-basic volcanic-fragmental sedimentaryformation) of early Sinian.According to the information about rare earth element and Sm-Nd isotopicgeochemistry,it can be believed that source rock of this series of metamorphic intermediate-basic vol-canic rocks is resulted from the products of crust-mantle mixing fractional crystallization and is an im-portant constitution of volcanic eruption-calcic-silica fragmental sedimentary formation of early Sinianin sea area of South China.

地质时代置于晚震旦—寒武纪的“稻香组”主要出露于政和城关南面、稻香、铁山等地。根据这套变质岩系岩石共生组合、岩石化学、微古生物和稳定同位素及其 Sm—Nd 同位索模式年龄(T_(DM)~(ND)800±50Ma,作者认为:“稻香组”应属于早震旦世中基性火山—碎屑沉积建造的东岩组。根据稀土元素和 Sm—Nd 同位素地球化学资料分析,该套变质中基性火山岩岩源来自壳幔混合分离结晶作用的产物,是早震旦世华南海域火山喷发—钙硅碎屑沉积建造的重要组成部分。

 
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