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devonian hydrothermal sedimentary
相关语句
  泥盆系热水沉积岩
     On Implications of the Devonian Hydrothermal Sedimentary Facies in the Qinling Orogeny
     秦岭造山带泥盆系热水沉积岩相应用研究及实例
短句来源
     ON CLASSIFICATIONS AND CHARACTERISTICS OF THE DEVONIAN HYDROTHERMAL SEDIMENTARY FACIES IN THE QINLLING OROGEN
     秦岭造山带泥盆系热水沉积岩相的亚相和微相划分及特征
短句来源
  相似匹配句对
     On Implications of the Devonian Hydrothermal Sedimentary Facies in the Qinling Orogeny
     秦岭造山带泥盆系热水沉积岩相应用研究及实例
短句来源
     ON CLASSIFICATIONS AND CHARACTERISTICS OF THE DEVONIAN HYDROTHERMAL SEDIMENTARY FACIES IN THE QINLLING OROGEN
     秦岭造山带泥盆系热水沉积岩相的亚相和微相划分及特征
短句来源
     GEOCHEMISTRY OF HYDROTHERMAL SEDIMENTARY SILICALITE
     热水沉积硅岩的地球化学
短句来源
     The hydrothermal sedimentary rocks developed in the Devonian have higher Au contents.
     泥盆系中发育热水沉积岩,含Au较高。
短句来源
     There are many types of seafloor hydrothermal sedimentary rocks in Devonian colunm, South Qinling.
     南秦岭泥盆纪沉积柱中产有多种类型海底热水沉积岩.它们的ΣREE偏低(平均63.09×10-6),REE配分曲线平缓右倾,La/Yb=2~8,Ce亏损,总体上与海水相似。
短句来源
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It was previously considered that all of the Pb-Zn deposits in the Xicheng orefield belong to Devonian hydrothermal-sedimentary deposits or their reworked ones. Study proves that the host strata, besides the Devonian, include the Lower Proterozoic. The ultra-large Changba-Liji-agou Pb-Zn deposit occurs in the Lower Proterozoic . -The deposits in this region are not hydrothermal-exhalation sedimentary deposits or their reworked ones, but Yanshanian-Himalayan epigenetic-hydrothermal...

It was previously considered that all of the Pb-Zn deposits in the Xicheng orefield belong to Devonian hydrothermal-sedimentary deposits or their reworked ones. Study proves that the host strata, besides the Devonian, include the Lower Proterozoic. The ultra-large Changba-Liji-agou Pb-Zn deposit occurs in the Lower Proterozoic . -The deposits in this region are not hydrothermal-exhalation sedimentary deposits or their reworked ones, but Yanshanian-Himalayan epigenetic-hydrothermal deposits. The occurrence characteristics, size and position of all the deposits in the Xicheng orefield are completely controlled by the Choula (draw)-thrust sheet. Therefore the previous grounds for the model of the Qinling-type Pb-Zn deposits cannot hold good. The writers propose to use Changba-type and Bijiashan-type Pb-Zn deposits to represent the two deposit models with different characteristics which are large in size and of great economic values in the Xicheng orefield.

以往资料认为西成矿田的铅锌矿床均属泥盆纪热水—喷流沉积或它们的改造型矿床。经笔者研究证实,西成矿田容矿地层除泥盆系外,还有古元古界。超大型厂坝—李家沟矿床产于古元古界地层中。该区矿床不是热水—喷流沉积型或其改造型矿床,而是燕山—喜马拉雅期的后生热液矿床。西成矿田中所有矿床的产出特征、规模和部位完全受抽拉—逆冲岩片构造的控制。为此,原秦岭式或秦岭型铅锌矿床模式的基础已不成立,建议用厂坝式、毕家山式等名称代表西成矿田中两类规模大、经济价值高、特征不同的矿床模式。

Siderite-silver-polymetallic deposits in Yindongzi and Daxigou ,Shaanxi, Province, China, occur at the Middle Devonian hydrothermal sedimentary facies in the subbasin on the sea bed. There is a major economic orebody in Daxigou which is 2000 m long, from 10 m to more than 100 m thick, and there is the main economic orebody of silve-polymetals in Yingdongzi which is 1900 m long, from 1.0 m to 20.0 m thick. According to patterns of hydrothermal sedimentation ,based on petrology,mineralogy, petrochemistry,...

Siderite-silver-polymetallic deposits in Yindongzi and Daxigou ,Shaanxi, Province, China, occur at the Middle Devonian hydrothermal sedimentary facies in the subbasin on the sea bed. There is a major economic orebody in Daxigou which is 2000 m long, from 10 m to more than 100 m thick, and there is the main economic orebody of silve-polymetals in Yingdongzi which is 1900 m long, from 1.0 m to 20.0 m thick. According to patterns of hydrothermal sedimentation ,based on petrology,mineralogy, petrochemistry, geochemistry for the hydrothermal sedimentary facies,the hydrothermal sedimentary facies and their rocks can be classified into five subfacies, respectively,hydrothermal synsedimentary replacement-ebullitional subfacies,hydrothermal synsedimentary subfacies,hydrothermal synsedimentary-replacement subfacies,hot-brine vadose-replacement subfacies,and hydrothermal-mixing synsedimentary sub facies.First,the hydrothermal synsedimentary replacement-ebullitional subfacies consist of brecciated albite carbonate rock and ore-bearing brecciated albite siliceous rock.These brecciated rocks may have formed by the synsedimentary replacement and ebuilition of hydrothermal fluids along pouring passways (synfaults)in the subbasin on the sea bed,for hydrothermal fluids could explode and ebuilite along their passways covered by pre-existing hydrothermal sediments under the pressure of hydrothermal fluid overpassing total pressure of their overlying waterbody in the subbasin and their overlying sediments.Secondly,hydrothermal synsedimentary subfacies is made up of albite rock,sideritite, baritite. These rocks essentially stratiform with their elongation parallel to the bedding and with subfacies change and thinning-out. For examples,Bariteolites were formed by the Ba-richi sulfate hot-brine in a way of rapid chemical precipitation in the subbasin on the sea bed while sideriteolites were produced by Fe-rich carbonate hydrothermal fluid in the same way at the same subbasin.These rock layers are characterized by bedded,laminated,layer-massive structures which change regularly in the subbasin.Thirdly,the hydrothermal synsedimentary replacement subfacies include siliceous ferrodolomitite,ferrodolomite,dolomitic limeston and, siderite ferrodolomile.These hydrothermal rocks occur in the footwall rocks of the orebody or in the pinning-out layer of hydrothermal rocks.They might have been produced by the synsedimentation of the hydrothermal.At the same time, synmetasomatism between the hydrothermal fluids and soft sediments on the bed or the slope of the subbasin could take place because replacement structures are easily recognized in the field and lab study.Results of research on minerology,structures and textures of the rock and petrochemistry have suggested that SiO 2,Al 2O 3 and FeO from the hydrothermal in the subbasin has been extensively replaced in the underlying carbonate sediments on the sea bed. Fourthly,the hot-brine vadose-replacement subfacies is composed of scapolite biotite hornstone and scapolite slate. These rocks can be formed by K, Na and Cl-rich hot-brines during their diagenetic processes in the extensively geothermal environment but it is difficult for them to be formed by the processes related to magmatic activities during superimposed stage with the exception of the hornstone enclosing magmatic intrusions. Finally,the subfacies of mixing of different chemical components and physical-chemical states of the hydrothermal fluids,one of the most important subfacies,include sulfide rocks and albite chert with ore formation. These rock layers or ore layers are characterized by bedded,laminated,layer-massive, graded bedding and graded rhythmite.and chemical bedding, The most important characteristic exists in these rock layers or ore layers.The chemica lbedding is as follows: laminated albite layer→albite-sulfide layer→albite-carbonate mineral-sulfide layer→albite-barite laminated layer→lamineated barite layer→barite-albite-chert layer→ferrdolomite lamnated layer. Most silver polymetallic ore layers were accumulated by t

陕西银硐子 -大西沟特大型菱铁银多金属矿床赋存于中泥盆世吉维特期之上的热水岩相中 ,其微相可划分为热水同生沉积 -沸腾交代微相、热水同生交代微相、热水同生沉积微相、热卤水渗滤交代微相、热水混合沉积微相。热水沉积岩富Na、Si、Fe、Mg、Mn、Ba、Cu、Pb、Zn、As、Ag、B等。在热水沉积盆地中 ,由富Ba的硫酸质热水、富Fe碳酸质热水以快速化学沉淀方式发生同生沉积成矿作用形成重晶石、菱铁矿层。银多金属矿层是由不同成分、性状、富Na、B、Si的铝硅酸质、硼酸质热水与前两类热水相互混合而形成热水混合体系 ,这种非平衡体系发生了剧烈地化学反应而使矿质发生骤沉。

The Tanjiagou Au deposit has Middle Devonian hydrothermal sedimentary rocks as host rock and ore bodies were situated in structure breccia zone of the foroan dolomite silicalite. All ore veins are confined to the strike fault. It is simple that the metallic mineral assemblage were formed in the mineralizing procecess. The hydrogen and oxygen isotope data of fluid inclusions in quartz veins indicate that ore forming fluid were mainly composed of the hydrothermal brine in deep seated rock, sulfur...

The Tanjiagou Au deposit has Middle Devonian hydrothermal sedimentary rocks as host rock and ore bodies were situated in structure breccia zone of the foroan dolomite silicalite. All ore veins are confined to the strike fault. It is simple that the metallic mineral assemblage were formed in the mineralizing procecess. The hydrogen and oxygen isotope data of fluid inclusions in quartz veins indicate that ore forming fluid were mainly composed of the hydrothermal brine in deep seated rock, sulfur isotope composition of sulfides from ore veins suggest that the sulfur came from the reduction of sea water sulfate. The characteristic of ore lead isotope indicates that ore forming metal came from the crust. Fluid inclusion in quartz from ore vein are composed of Na +, K +, Mg 2+ , Ca 2+ , Cl -, SO 4 2- , F -, with average salinity of 6.86 wt% equivalent NaCl.

谭家沟金矿产于中泥盆统热水沉积岩中。矿体位于铁白云石硅质岩构造角砾带 ,是以浸染状矿化为主 ,由热水沉积铁白云石硅质岩提供矿质并基本在层内富集成矿的热水沉积改造型金矿床。铅同位素特征表明成矿金属来源于地壳 ;硫同位素组成特征表明硫主要来自海水硫酸盐的还原硫 ;氢氧同位素测试数据表明 ,成矿流体主要为原生建造水。成矿流体为SO4 2 F/Na+ Ca2 + 型 ,成矿物理化学条件为弱中等还原环境 ,成矿温度 15 0~ 170℃ ,盐度w(NaCl)为 6 .86 %。

 
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