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good outcrops
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  出露良好
     The Tianshan region, one of the regions in China and even in the world with development of non-marine Permian-Triassic sediments of complete sequence, continuous sedimentation, rich fossils and good outcrops is a ideal place to study and set up strato-type section of non-marine Permian-Triassic boundary.
     天山地区二叠─三叠系地层发育齐全、沉积连续、化石丰富、出露良好,是研究和建立非海相二叠─三叠系界线层型剖面的理想地区之一。
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  相似匹配句对
     Good Friends
     好朋友
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     The Good Wife
     好老婆
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     the fault outcrops to the surface;
     断面出露地表;
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     Recognition and division of carbonate cyclic sequence in outcrops.
     露头碳酸盐岩旋回层序的识别与划分
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     Geophysical Characteristics of Ordovician Reef Outcrops in Tarim B asin
     塔里木盆地奥陶系生物礁露头的地球物理特征
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  good outcrops
To date the company has excavated test pits in seams 6 and 7, which have exposed good outcrops of the seams.
      


The Tianshan region, one of the regions in China and even in the world with development of non-marine Permian-Triassic sediments of complete sequence, continuous sedimentation, rich fossils and good outcrops is a ideal place to study and set up strato-type section of non-marine Permian-Triassic boundary.By study of magnetism of north limb and south limb sections of Dalongkou anticline in Santai of Jimsar, and of Permian-Triassic boundary section in Lucaogou of Urumqi county, magnetic proofs are supplied...

The Tianshan region, one of the regions in China and even in the world with development of non-marine Permian-Triassic sediments of complete sequence, continuous sedimentation, rich fossils and good outcrops is a ideal place to study and set up strato-type section of non-marine Permian-Triassic boundary.By study of magnetism of north limb and south limb sections of Dalongkou anticline in Santai of Jimsar, and of Permian-Triassic boundary section in Lucaogou of Urumqi county, magnetic proofs are supplied for the division of Permian-Triassic boundary.Frequent polar inversions, also called Illawarra polar interval, occur in the non-marine section as in marine sections in China. It supplies a basis for the worldwide division and correlation of Permian-Triassic boundary.

天山地区二叠─三叠系地层发育齐全、沉积连续、化石丰富、出露良好,是研究和建立非海相二叠─三叠系界线层型剖面的理想地区之一。通过对吉木萨尔县三台大龙口背斜北翼、南翼剖面及乌鲁木齐县芦草沟二叠─三叠系界线剖面古地磁特征研究,提供了二叠─三叠系界线划分的古地磁依据。国内二叠─三叠系海、相非海相剖面研究表明,在海相或非海相二叠─三叠系界线附近均有频繁极性倒转,即伊拉瓦次(Illawarra)极性间隔的存在,为全球性二叠─三叠系界线划分与对比奠定了基础。

The Carboniferous strata extensively distributes in Sichuan,Yunnan,Guizhou and Guangxi provinces. It has the characteristicse of clear stratigraphic division and correlation, plentiful sediment types and better outcrops. It is suitable to have the sequence stratigraphy research in these areas. This paper has focused on the accurate researches of the exposure sequence stratigraphy of the Carboniferous strata based on the detailed sedimentological study and accurate stratigraphic division and correlation...

The Carboniferous strata extensively distributes in Sichuan,Yunnan,Guizhou and Guangxi provinces. It has the characteristicse of clear stratigraphic division and correlation, plentiful sediment types and better outcrops. It is suitable to have the sequence stratigraphy research in these areas. This paper has focused on the accurate researches of the exposure sequence stratigraphy of the Carboniferous strata based on the detailed sedimentological study and accurate stratigraphic division and correlation of the Carboniferous strata in Sichuan,Yunnan,Guizhou and Guangxi provinces with the aid of the theory and studying means of the exposure sequence stratigraphy. Sequences are divided mainly by the characteristics of the key boundary surfaces,regional correlation,sedimentary facies sequence changes,parasequence stacking patterns,facies assemblage and sedimentary geochemistry. It has expounded in detail the outcrop signs of the sequence division and various boundary surfaces. The Carboniferous strata in the study area are divided into 10 third\|scale sequences, which are named from sequence 1 to 10, with the upper series of Carboniferous strata having 5 sequences and the lower series also. In the lower series of Carboniferous strata, Yanguan stage are composed of sequence 1 to 2, and Datang stage from sequences 3 to 5. In the upper series, Huashiban stage are composed of sequence 6 and Dala stage of sequence 7, and Maping stage from sequence 8 to 10. According to the features of the bottom boundary surface, 10 sequences are classified into two sorts of sequences, which are type Ⅰ sequence (S\-1,S\-3,S\-6,S\-9,S\-\{10\}) and type Ⅱ sequence(S\-2,S\-4,S\-5,S\-7,S\-8). The bottom boundary surfaces of type Ⅰ sequence all have clear signs including the strong paleokarst,the different thickness eluvial facies,the strata discontinutity,the immense changes of sedimentary patterns and traits,the regional revival of river,the disappearence and abrupt changes of organism evolution and the huge and sudden alternation of carbon,oxygen and strontium isotope values. On the other hand, the bottom boundary surfaces of type Ⅱ sequence are character ized by the transient exposure,the weak erosion and the lithoface texture transformation. So it is discerned more difficultly than the bottom boundary surface of type Ⅰ sequence. This paper also has expounded in detail the sedimentary features of the first transgressive surfaces and condensed sections of sequences in the different sedimentary environments and basins. It has summarized the sedimentary characteristics of the different system tracts in the different facies and basins. On the basis of these researches, this paper has probed the sequence correlation in the different sedimentary facies and basins from the ways of the sequence numbers,boundary surface traits and system tract structures and has founded the time\|space pattern diagram of the Carboniferous sequence strata in the study area.

川滇黔桂地区石炭系地层发育 ,其地层划分对比清楚 ,沉积类型丰富 ,地表露头良好 ,是进行层序地层研究的理想场所。本文运用层序地层学的理论和研究方法 ,在详细的沉积学研究和精细的地层划分对比基础上 ,对川滇黔桂地区石炭系地层进行了精细的露头层序地层研究 ,详细阐述了层序建立和各种界面的露头标志 ,探讨了川滇黔桂地区石炭系地层的层序划分、层序区域对比。在此基础上 ,建立了研究区石炭系层序地层时空格架示意图

There are two kinds of fluids in subduction zones, the aqueous fluid released by dehydration and the melt created by melting. Cycling processes and simultaneous chemical reactions of fluids in subduction zones play an important role in the evolutions of Earth crust and mantle and in the substance exchange. The geochemistry of island-arc volcanics can trace the feature and composition of fluids. High-pressure veins cutting metamorphic rocks in the orogenic belt have recorded the fluid activity directly. The composition...

There are two kinds of fluids in subduction zones, the aqueous fluid released by dehydration and the melt created by melting. Cycling processes and simultaneous chemical reactions of fluids in subduction zones play an important role in the evolutions of Earth crust and mantle and in the substance exchange. The geochemistry of island-arc volcanics can trace the feature and composition of fluids. High-pressure veins cutting metamorphic rocks in the orogenic belt have recorded the fluid activity directly. The composition and the source of fluids could be traced by the geochemical study on the high-pressure veins and related host rocks. The composition of fluids is related to the depth at which the fluids were released. The aqueous fluids have a considerably high solubility within the depth to a subduction zone (>50km). Fluids can migrate in a channel-controlled way on a large scale or in a pervasive penetration way on a limited scale. The source of fluids is external or internal respectively. The quantitative relationships between chemical composition, migration way and substance exchange mechanism of fluids in subduction zones on the one hand and the depth, thermal state and construction of subduction zones on the other will be the important subjects for future studies on the fluids in subduction zone. Southwestern Tianshan Mountains, China, show a very good outcrop of high-pressure veins. Four different types of high-pressure veins can be identified according to the mineral assemblages of veins. Variations in δ 18 O values of omphacites between the different veins is less than 0.9‰. The omphacites at different locations of a vein almost have an equal δ 18 O values(variations in δ 18 O omp ≤0.31‰).Except for one sample,the δ 18 O values of quartz separated from different veins vary between 12‰ and 13.9‰.For a certain host-vein pair, the calculated δ 18 O values of whole-rock of the host rock under the metamorphic temperature of the eclogites in the area using the δ 18 O values of quartz or omphacites of the veins, are almost the same as the analytical values. The authors suggested that, on either a large or microscopic scale, the oxygen isotope exchange between host rocks and the fluids in the ancient subduction zones nearly equilibrated during the formation of the high-pressure veins.The δ 18 O values of the fluids in the subduction zones is about +10.8 ‰.The fluids were released by host rocks-the oceanic basalts which had undergone low temperature alteration by sea water.The results of oxygen isotope of high-pressure veins and host rocks in Tianshan indicate that there were certain amounts of fluids ever released by host rocks at blueschist to eclogite transition, and the movement of the fluids was on a large scale.

俯冲带流体包括俯冲带岩石脱水形成的水流体和熔融作用产生的熔体。俯冲带流体循环及伴随的化学作用是壳幔演化和物质交换的重要机制。岛弧火山岩地球化学研究可以示踪流体的性质、成分。造山带变质岩内高压脉是俯冲带流体活动的直接记录。通过高压脉及其主岩地球化学研究 ,可以示踪流体成分和来源。俯冲带水流体成分与流体释放深度有关 ,俯冲带深处 ( >5 0km)形成的水流体内溶质相当可观。水流体流动方式有大规模沟道式和小规模弥散式 ,与其相应的流体来源分别为外来的和内部的。俯冲带流体组分、流动方式、物质交换机制与俯冲带深度、热状态、物质结构的定量关系 ,以及矿物 /水流体间元素分配系数的高压实验可能将是俯冲带流体今后研究的重要课题。中国西天山高压变质带榴辉岩及蓝片岩中广泛发育高压脉 ,根据脉的矿物组合 ,高压脉可分成 4种类型。高压脉氧同位素研究表明 ,脉体与流体间氧同位素交换宏观与局部平衡 ,流体活动为大规模的 ;流体活动方式既有沟道式 ,又有渗透式 ;流体的δ18O值为 + 10 .8‰左右 ,流体来源于主岩经过海水低温蚀变的大洋玄武岩。西天山广泛发育的高压脉 (尤其是蓝片岩中的高压脉的发现目前在世界范围尚属首例 ) ,是...

俯冲带流体包括俯冲带岩石脱水形成的水流体和熔融作用产生的熔体。俯冲带流体循环及伴随的化学作用是壳幔演化和物质交换的重要机制。岛弧火山岩地球化学研究可以示踪流体的性质、成分。造山带变质岩内高压脉是俯冲带流体活动的直接记录。通过高压脉及其主岩地球化学研究 ,可以示踪流体成分和来源。俯冲带水流体成分与流体释放深度有关 ,俯冲带深处 ( >5 0km)形成的水流体内溶质相当可观。水流体流动方式有大规模沟道式和小规模弥散式 ,与其相应的流体来源分别为外来的和内部的。俯冲带流体组分、流动方式、物质交换机制与俯冲带深度、热状态、物质结构的定量关系 ,以及矿物 /水流体间元素分配系数的高压实验可能将是俯冲带流体今后研究的重要课题。中国西天山高压变质带榴辉岩及蓝片岩中广泛发育高压脉 ,根据脉的矿物组合 ,高压脉可分成 4种类型。高压脉氧同位素研究表明 ,脉体与流体间氧同位素交换宏观与局部平衡 ,流体活动为大规模的 ;流体活动方式既有沟道式 ,又有渗透式 ;流体的δ18O值为 + 10 .8‰左右 ,流体来源于主岩经过海水低温蚀变的大洋玄武岩。西天山广泛发育的高压脉 (尤其是蓝片岩中的高压脉的发现目前在世界范围尚属首例 ) ,是研究古俯冲带流体作用良好的野外天然实验室。

 
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