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the mesoproterozoic
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  中元古代
     However there are clearly stratigraphic boundaries in1. 6 Ga, 1. 4 Ga and 1. 2 Ga, so the Mesoproterozoic may be able to subdivide into four Periods.
     然而,中元古代内位于1.6Ga、1.4Ga和1.ZGa均有明确的地层界线,所以有可能进一步划分为四个纪。
短句来源
     Granitoids in the late stage of the Mesoproterozoic along the north margin of the North China plate, are composed of biotite granites, tonalites, granodiorites and monzonitic granites. They exhibit the features of peraluminous granites, A/CNK>1.1, and are characterized by higher SiO2, K2O and low FeO, MgO, CaO, TiO2, also higher Rb, K, Ta, Nd, Hf and low Nb, Sr, P, Ti in trace and minor elements.
     华北板块北缘出露的中元古代晚期花岗岩主要为黑云母花岗岩和二长花岗岩,化学上富SiO2和K2O,贫FeO、CaO、MgO和TiO2,A/CNK平均大于1.1,具过铝质花岗岩特征。 微量元素Nb、Sr、P、Ti相对亏损,而Rb、K、Ta、Nd相对富集;
短句来源
     According to the features of deformation and metamorphism and isotope ages ,the Huanglongtan and Shimenguan Formation Complexes may be merged into the Paleoproterozoic Goutouqing Group Complex(with a zircon U Pb age of 2000 Ma),the Longquanfeng ,Zhonghesi and Mangyongxi Formation Complexes are merged into the Mesoproterozoic Cangshan Group Complex (with Sm Nd model ages of 1000 1400 Ma),and the Luopingshan Formation Complex has been determined to be of Late Proterozoic age (with a Rb Sr isochron age of 698 Ma).
     据其变形、变质特征和同位素年龄,将黄龙潭、石门关岩组归并为古元古代沟头箐岩群(锆石U-Pb年龄2000Ma),龙泉峰、中和寺、茫涌溪岩组归并为中元古代苍山岩群(Sm-Nd模式年龄1000—1400Ma),罗坪山岩组则确定为晚元古代(Rb-Sr等时线年龄698Ma)。
短句来源
     A high-quality paleomagnetic pole with positive fold and reversal tests at 190.4°E, 2.4°N has been acquired from the Mesoproterozoic Yangzhuang Formation in North China Block.
     华北地块中元古代杨庄组的古地磁研究提供了一个同时通过褶皱检验和倒转检验的古地磁极,极位置为经度190.4°、纬度2.4°。
短句来源
     The greenschist-facies metamorphism along with the Mesoproterozoic Wandongguo Group at ~1.0 Ga corresponds to the assembly event of the Rodinia supercontinent.
     随后又与中元古代万洞沟岩群一道于~1.0Ga发生绿片岩相变质作用,共同响应了全球Rodinia超大陆汇聚事件;
短句来源
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  元古界
     CHARACTERISTICS AND GEOLOGICAL SIGNIFICANCE OF THE DUNZIGOU GROUP OF THE MESOPROTEROZOIC IN THE WESTERN EDGE OF THE NORTH CHINA PLATFORM
     华北地台西缘中元古界蓟县系墩子沟群特征及其地质意义
短句来源
     The Mesoproterozoic Wumishan Formation at the Jixian section of Tianjin is a succession of 3300-m-thick carbonate strata formed in a period of about 100 Ma (1310 ±20~1207 ±10 Ma). In this succession of strata, the carbonate meter-scale cyclic sequences belong to peritidal type with an approximately symmetrical lithofacies-succession are best developed.
     天津蓟县剖面的中元古界雾迷山组,是一套厚3300m 的碳酸盐岩地层,其形成时限大致为100Ma (1310 ±20~1207 ±10 Ma),其中具近似对称相序组构的环潮坪型碳酸盐米级旋回层序特别以育。
短句来源
     The geological and geochemical characteristics of these stratiform deposits are notably different from those of both the MVT-type Pb-Zn deposits hosted in the cover carbonate rocks and VMS-type Pb-Zn deposits hosted in the Mesoproterozoic metamorphic basement rocks of the Huili Group in the regional Pb-Zn ore belt.
     矿床中发育层状、纹层状、条带状、同沉积角砾状、层间揉皱等构造,沉积特征明显。 矿床的地质、地球化学特征显著区别于区域上以往发现的产于地台盖层碳酸盐岩中具有明显后生成因特点的密西西比河谷型(MVT型)铅锌矿床,也有别于产于中元古界褶皱基底中的火山沉积块状硫化物型(VMS型)铅锌矿床。
短句来源
     The Mesoproterozoic and Neoproterozoic strata in the Shengongcun area, Fuyang, northern Zhejiang, are intruded by a monzogranite-porphyry dike. Samples taken from the dike have high-resolution zircon SHRIMP U-Pb ages of 117.7±2.7 Ma.
     浙北富阳神功村地区二长花岗斑岩脉侵入于中新元古界地层中,采自该岩脉样品的锆石离子探针(SHRIMP)U-Pb同位素年龄为117.7Ma±2.7Ma。
短句来源
     The Nd model ages of high-grade meta-morphic surrounding rocks range between1435and1580Ma ,being equivalent to the Mesoproterozoic Changchengian Period,which suggests that the Xemirxek Group formed in the Mesoproterozoic.
     深变质围岩的Nd模式年龄为1435~1580Ma,相当于中元古代长城纪,代表了阿尔泰地区下—中元古界克木齐群形成的时代。
短句来源
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  “the mesoproterozoic”译为未确定词的双语例句
     Discussion on Some Problems in the Mesoproterozoic and Neoproterozoic Stratigraphical Study in China
     我国中新元古代地层研究中若干问题的探讨
短句来源
     Sixty-four duplicate composite samples of stream sediments taken during 1∶200000 geochemical prospecting in eastern Yunnan Province were recombined according to an area of 8 km × 8 km, and their Pt and Pd contents were measured by the C-OES method. On that basis, four types of Pt and Pd anomalies are recognized: ① Pt and Pd anomalies related to black shale formations of the Mesoproterozoic Kunyang Group;
     利用滇东地区1∶20万水系沉积物化探的组合副样,按8km×8km面积重新组合,采用C-OES法定量分析其Pt、Pd含量,在此基础上圈定了4种主要类型Pt、Pd异常:①与中古元古代昆阳群黑色页岩建造有关的Pt、Pd异常;
短句来源
     Sm-Nd Isotope Dating and Geological Implications for the Mesoproterozoic Mamianshan Group in Fujian Province
     福建马面山群Sm-Nd同位素年龄及其地质意义
短句来源
     The Dongyan Formation of the Mesoproterozoic Mamianshan Group, Central Fujian Province, comprises mainly greenschist, marble, quartz schist and felsic rocks.
     闽中地区马面山群东岩组地层主要为绿片岩为主的一套古火山沉积建造。
短句来源
     4. The study on the regional geochemical setting suggests that Au-Pb-Zn assemblywas enriched in the Paleoproterozoic base period in Alashan area; Au-Zn-Pd-Niassembly was enriched in the Mesoproterozoic Era in the covering bed period; Pd-Pt-Niassembly enriched in the Neoproterozoic Era;
     4、通过区域地球化学背景研究,提出区内基底时期Au-Pb-Zn富集;
短句来源
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  the mesoproterozoic
A wide size range of rod-shaped, ellipsoidal akinites assignable to Archaeoellipsoides are reported from the Newari locality of the Mesoproterozoic Kheinjua Formation of the Semri Group, Vindhyan Supergroup.
      
The Mesoproterozoic diamondiferous Majhgawan pipe of central India is re-examined in the light of new and recently published petrological, geochemical and isotope data.
      
A petrological and geochemical reappraisal of the Mesoproterozoic diamondiferous Majhgawan pipe of central India: evidence for t
      
?Part of the Mesoproterozoic (1.6?Ga) Gawler Range Volcanics in South Australia is composed of mingled feldspar- quartz- phyric dacite, rhyodacite and rhyolite lavas.
      
In the Yamantau anticlinorium, the greenschist-facies metamorphism of the Mesoproterozoic siliciclastic rocks is of Early Neoproterozoic origin (about 970?Ma) and the S1 cleavage formation of Late Neoproterozoic (about 550?Ma).
      
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Neoproterozoic strata in South China can be correlated with similar-aged rocks in Australia, especially in the Amadeus,Kimberley and Savory basins and the Adelaide geosyncline. Three or four shallowing-upward sequences and several intra-sequence boundaries can be recognised by means of sedimentary environments and relationships of bounding surfaces,as well as by correlation using distinctive marker horizons, such as diamictite, tillite,ironstone,manganese-bearing argillite of marl,dolomite and volcanic rocks....

Neoproterozoic strata in South China can be correlated with similar-aged rocks in Australia, especially in the Amadeus,Kimberley and Savory basins and the Adelaide geosyncline. Three or four shallowing-upward sequences and several intra-sequence boundaries can be recognised by means of sedimentary environments and relationships of bounding surfaces,as well as by correlation using distinctive marker horizons, such as diamictite, tillite,ironstone,manganese-bearing argillite of marl,dolomite and volcanic rocks. Comparison of the sequences indicates that the Pualco and Appila tillites.of the Sturtian glacial interval can be correlated with the Changan diamictite and Nantuo tillite,respectively, but that there is no correlate of the Marinoan tillite in South China. Reconstruction of the paleogeography suggests that during the Neoproterozoic the southeastern margin of South China was probably located adjacent to the northeastern margin of Australia, Both areas underwent deformation and metamorphism towards the end of the Mesoproterozoic as they were amalgamated the Rodinian supercontinent. This was followed by extension and subsidence, and led to separation from Laurentia in the Mid-Neoproterozoic. During the same interval, the western margin of South China was undergoing extension with accumulation of mafic volcanics, in graben. By contrast, the northern margin of South China was a subducting margin in the Early Neoproterozoic, with accumulation of atc-volcanics, and in the Late Neoproterozoic was transformed into a passive margin with accumulation of deep-water carbonates.The evidence suggests that South China was connected to Australia in the Neoproterozoic until the end of the Sturtian glacial interval(~700Ma),broke away before the Marinoan glaciation(~610Ma), but was sufficiently dose to Australia in the Early Cambrian to share the same trilobite faunal province.

扬子古大陆与澳大利亚古大陆的新元古界均由3~5个向上变浅的层序组成,层序与构造地层结构转换面的特征对比和古陆拼合表明,新元古代时期扬子古大陆位于澳大利亚古大陆北侧,其东南边缘与澳大利亚古大陆东缘可能处于同一被动大陆边缘构造环境,它们所经历的挤压、拉张、沉降过程与晚元古代Rodinia超级古大陆的形成、分裂、移离有密切关系。

The geologic ages of Middle-Upper Proterozoic in North China are obtained mainly from isotopic dating of sedimentary rocks and dykes, because there are few volcanics in that period. Recent works have recognized basalts from the Mesoproterozoic Fanhe Group (PFG) with classic continental rift sequence which is composed of shallow water elastics and carbonate rocks with gabbro sills and dykes. The isotopic dating of PFG basalts gives a Sin-Nd isochronic age of 1199 ± 39 Ma and , which suggests that there...

The geologic ages of Middle-Upper Proterozoic in North China are obtained mainly from isotopic dating of sedimentary rocks and dykes, because there are few volcanics in that period. Recent works have recognized basalts from the Mesoproterozoic Fanhe Group (PFG) with classic continental rift sequence which is composed of shallow water elastics and carbonate rocks with gabbro sills and dykes. The isotopic dating of PFG basalts gives a Sin-Nd isochronic age of 1199 ± 39 Ma and , which suggests that there did exist volcanism within NCP ca 1200 Ma. Geochemical diagrams of FeO (total)-Al2O3-MgO,TiO2-K2O-P2O5, Ti/100--Zr-Y·3,TiO2-T/Nd and TiO2-Zr indicate that the PFG basalts erupted in the continental rift environment. The Archaean crust-like REE pattern with enrichment of LREE and no negative Eu anomaly and not only demonstrate that the PFG basalts came from the Archaean continental contamination of the partial melting of the crust,but also indicate that there might exist a reworking of crustal structure ca 1200 Ma. From the above information and regional geology,it can be inferred that NCP developed a large NNE-SSW continental rifting system which rifted gradually from S to N and that Fanhe area was just located at the north end of the rifting system during Meso-Neoproterozoic.

由于缺乏合适的测年对象,华北地区中上元古界的年龄值主要是从沉积岩及脉岩中获得。该文据近来从辽北中元古界凡河群中识别出的一套同期喷发玄武岩,获得其Sin-Nd等时线年龄为1199±39Mr。FrO(全)-Al2O3-MgO,Ti/100-ZI-Y·3,TiO2-K2O-P2O5,TiO2-Y/Nb和TiO2-Zr图解指示了其大陆内部的裂谷构造环境。87Sr/86Sr=0.7030,=-9.5~-11,及无Eu负异常的轻稀土富集型配分模式表明岩浆源于上地幔及太古界地壳的重熔。综合分析华北板块内中晚元古代沉积层序及火山作用,推测中晚元古代时凡河地区是位于华北板块内部近北北东向裂陷槽北部末端部位的裂谷盆地,该裂陷槽由南向北渐次开裂呈楔形。

By using the structural analysis and the new method of tectono rock stata mapping ,the Cangshan metamorphic rocks may be divided into the Huanglongtan,Shimenguan,Longquanfeng,Zhonghesi,Mangyongxi and Luopingshan Formations Complexes.According to the features of deformation and metamorphism and isotope ages ,the Huanglongtan and Shimenguan Formation Complexes may be merged into the Paleoproterozoic Goutouqing Group Complex(with a zircon U Pb age of 2000...

By using the structural analysis and the new method of tectono rock stata mapping ,the Cangshan metamorphic rocks may be divided into the Huanglongtan,Shimenguan,Longquanfeng,Zhonghesi,Mangyongxi and Luopingshan Formations Complexes.According to the features of deformation and metamorphism and isotope ages ,the Huanglongtan and Shimenguan Formation Complexes may be merged into the Paleoproterozoic Goutouqing Group Complex(with a zircon U Pb age of 2000 Ma),the Longquanfeng ,Zhonghesi and Mangyongxi Formation Complexes are merged into the Mesoproterozoic Cangshan Group Complex (with Sm Nd model ages of 1000 1400 Ma),and the Luopingshan Formation Complex has been determined to be of Late Proterozoic age (with a Rb Sr isochron age of 698 Ma).

运用构造解析和构造—岩层填图新方法,将苍山变质岩划分为黄龙潭、石门关、龙泉峰、中和寺、茫涌溪和罗坪山6个岩组。据其变形、变质特征和同位素年龄,将黄龙潭、石门关岩组归并为古元古代沟头箐岩群(锆石U-Pb年龄2000Ma),龙泉峰、中和寺、茫涌溪岩组归并为中元古代苍山岩群(Sm-Nd模式年龄1000—1400Ma),罗坪山岩组则确定为晚元古代(Rb-Sr等时线年龄698Ma)。

 
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