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The characters of geochemistry are rich alkali. And at the same time the content of calcium is high. They are rich in alkali, high in Potassium, enriched in LILE, LREE and Pb, depleted in HFSE and have a small Sr, Nd, Pb isotope range. Their source is probably a kind of even metasomatic mantle. This is consistent with the fact that there is kimberlite containing flogopite in the deep-source enclosure of Cenozoic super-K alkali lava in the southern part of this rock zone.
组成这些钾质碱性岩带的岩石:在岩相上,包括深成相、浅成相和喷溢相等不同岩相;在岩性上,从超基性、基性、中性到酸性岩石;造岩矿物,从超基性到酸性岩石中均有透辉石,在基性、超基性岩中有霞石;在岩石化学成分上,所有岩石均表现出富碱高钾富钙,微量元素富集Rb、Sr、Ba等大离子亲石元素和Th、U等放射性元素,贫Nb、Ta、Zr、Hf等高场强元素;稀土元素富集轻稀土,铕负异常不明显;Sr、Nd、Pb同位素组成,显示了物质来源于富集地幔源区。
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Based on field work in fourteen typical ore districts of China, the author made experiments on contact metasomatism of ultrabasic-acid intrusive rocks with carbonate rocks, interaction between volcanic pneumatolyto-hydrothermal solution and volcanic rocks, and metasomatism in the process of sedimentary metamorphism and migmatizatiun.
本文作者在全国14个典型矿区的野外工作基础上,进行了超基性-酸性侵入岩与碳酸盐岩的接触交代实验;火山气热液与火山岩的相互交代实验;区域沉积变质和混合岩化过程中的交代作用实验。
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In this paper, the petrology, mineralogy and geochemistry of basic-ultrabasic volcanic rock, granite and skarn related to the Sn-Cu skarn-type ore and the vein-type ore in Laochang ore field have been researched systematically, some conclusions are summarized as follows:In Gejiu tin-polymetallic district, the middle Triassic volcanic rocks belonging to calc-alkaline basalt-tholeiite serie, mainly consist of pyroxene, hornblende, feldspar, chlorite and phlogopite; All the granites are peraluminous granites related to the Yanshanian collision-orogeny. Laoka granite closely related to the tin-polymetallic deposits emplaced in the post- orogenic.The metal elements show obviously vertical zones with the variety of skarn types in dimensional extension; The occurrence of garnet skarn and diopside skarn alternately developed in the horizontal zones of the contact between granite and carbonatite are mainly related to two factors: one factor is the infiltration metasomatism of post-magmatic hydrothermal solution, the another is the metrical strata of marble and calcic-dolomite developed in country rocks.
本文重点以老厂矿田中的接触带锡铜矿床和脉状矿床为研究对象,采用化学分析、ICP-MS、X射线粉晶衍射分析、电子探针等测试手段,对本区与成矿相关的基性-超基性火山岩、花岗岩、夕卡岩、电气石-石榴石等进行了系统的地质地球化学研究,研究表明:个旧矿区中三叠纪个旧组地层中的火山岩为钙碱性玄武岩-拉斑玄武岩系列,岩石为辉石-角闪石-长石-绿泥石-金云母组合;本区的花岗岩为过铝质花岗岩,主要与燕山期碰撞造山作用有关,锡多金属成矿与形成时代最晚、分异较好的花岗岩关系密切;本区夕卡岩中的有用共生组份随着夕卡岩类型及其矿物组合的不同具有明显的分带性。
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The shapes, occurences, rock types, mineral components and Petrochemical components of three ultrabasic rock groups all have different characteristics and show certain regularities. K-Ar and Sin-Nd iso...
各岩群的形态、产状、岩石类型、矿物成份、化学成份各有特点,表现出一定的规律性。K-Ar及Sm-Nd同位素年龄表明,这些超基性告形成于中元古宙、海西期及印支期。
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The two volcanic materials are similar but are also different ①the partition mode of rare-earth element is similar to that of the basalt.②the increase content of the rare-earth element content in transitional layer shows that it enrichs in this segment due to the volcano events. Moreover, the comparability of the partition mode shows that the volcano-genic materials and the basalt are of the same source.③low Eu anomaly different from the high Eu anomaly of medium-acidic tuff in Meishan section, that show that their formation is different④there are plentiful basalt detritus.⑤there are enrichment of the Ti element.⑥the lower content of siderophile element of Ni and Co, especially in the transitional layer, show that there were not extraterrestrial events and big scale basic or ultrabasic volcano eruption events in this area. These characteristics show that the sedimentary source of Xuanwei Formation and Kayitou Formation is basalt.
1稀土元素配分模式与玄武岩类似;(2)稀土元素含量在异常层的增加反映了火山事件导致了它在该段地层中的富集,而配分模式的相似性反映了火山物质来源与玄武岩具有同源性;(3)低"Eu"异常区别于煤山剖面的中酸性凝灰岩高"Eu"异常模式,说明界线粘土岩成因也不同于煤山剖面的界线粘土;(4)大量的玄武岩岩屑;(5)Ti元素的富集;(6)亲铁元素Ni和Co含量较低,特别是在界线异常层含量降低,表明本区在界线处可能并不存在地外事件和大规模基性、超基性火山喷发事件,这些特征反映本区宣威组和卡以头组物质来源主要为玄武岩。
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These processes resulted i n the formation of peculiar dunites in the hyperbasite complexes ,development of low-sulfide horizons and hortonolite dunites in the basite-hyp erbasite layered intrusions (platinum-group metal deposits),and specific proces ses of transmagmatic sulfurization of the iron-rich igneous differentiates (Cu -Ni sulfide and Cu-Zn-Pb sulfide ores).
这些作用导致产在超基性杂岩中的特殊纯橄榄岩、基性超基性层状侵入体中的低硫层和铁镁橄榄石纯橄榄岩的形成,以及富铁火成分异岩的透岩浆硫化作用(Cu-Ni硫化物和Cu-Zn-Pb硫化物矿石)。
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Mafic, ultramafic and/or alkaline volcanic rocks and their entrained mantle peridotitic xenoliths and xenocrysts are known as samples directly from the lithospheric mantle.
基性、超基性火山岩捕获的地幔橄榄岩捕虏体和捕虏晶是直接源自岩石圈地幔的样品。
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Focusing on the PGE enrichment mechanism in the basic-ultrabasic intrusions in the Panxi rift, firstly, through the interpretation of TM photograph, data processing of regional geochemical exploration and geophysical prospecting results of gravity, magnetic force and seism, we analyzed the controlling effect of structure and magmatic movement on the PGE mineralization; Secondly, through the study of volcanic apparatus, petrography, measurement of comprehensive geochemical section, isotope tracing and dating of typical PGE-rich melanocratic rock series, we discussed the sources of the PGE-bearing mafic-ultramafic intrusions and basalts, their timing, evolvement sequences, the geochemical processes of magma crystallization and fractionation, and the relationship between magma evolution and structural development; Finally, through the analysis of PGE and chalcophile elements concentrations in the melanocratic rock series and the contrastive study with the Noril''sk magmatic Ni-Cu-PGE sulfide deposit, its related continental flood basalts and Siberia Traps, we discussed PGE mineralization characteristics and its enrichment mechanisms in the melanocratic rock series in the Panxi rift.
本项目首先围绕川西地区主要的PGE矿床及伴生矿的地质环境和有关的地质构造背景,通过TM卫片解译、区域化探和重、磁及地震物探资料分析,总体把握构造及岩浆活动对PGE成矿的控制作用;然后通过对典型富PGE暗色岩套的火山机构地质构造、岩石岩相学、地球化学、同位素定年和示踪等方面的工作,分析本区基性-超基性含矿岩体与喷出岩之间的成岩物质来源、侵入时代及演化序列,研究该区同一岩浆房分异结晶的地球化学过程及其随构造发展的耦合关系;最后通过对暗色岩套PGE地球化学剖面分析以及与俄罗斯诺里尔斯克陆内裂谷溢流型玄武岩中PGE矿化的岩石-构造环境对比研究,探讨该区暗色岩套中的矿化特点和富集部位及其PGE富集机制。
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And in the 19 century alkali rocks are often associated with Pacific style natric alkali rocks and mediterranean style potassic alkaic rocks. They were usually generated in deep-large-fault zone and closely connected with basic/ultra basic rocks in space.
在十九世纪九十年代就将碱性岩分为大西洋型的钠质碱性岩和地中海型的钾质碱性岩,到二十世纪九十年代将碱性岩分为超基性碱性岩、基性碱性岩、中性碱性岩和碱性岩。
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The orogenic strata have following characteristics: During the subduction and intracontinental orogeny, the strata experienced dramatic tectonic migration and mixing, resulting in various tectonic features. A short sequence usually composed of tectonic slices of various origins, times, deformations and metamorphisms, and scales. The original sequence was badly destroyed. The extant fragments of orogenic belt usually took form as melanges, especially the accretion complex wedge generated in subduction zone, which is contrary to the Law of Superposition. The original location of the accretion is also contradicted with the Law of Original Horizonality, because the accretion is oblique with high degree. Marine rocks, volcanic rocks of continental margin and metamorphic rocks were well-developed in the orogenic belt, especially ultra-basic, basic rocks were wide spread and were intensely metamorphosed, accompanied by metamorphic slices returned from hundred kilometers underground with ultra-high pressure and magma movements during syn-orogeny and post-orogeny, thus formed the colorful landscapes.
造山带非史密斯地层构成具如下独特性和复杂性:造山带在俯冲碰撞和陆内造山阶段,发生过强烈的构造搬运和构造混杂,构造形迹多样化,垂直不长的地层体往往是众多不同来源、不同时代,不同变形变质程度,不同大小的各种构造岩片拼贴体,地层原始层序被严重肢解、破坏;尤以产于俯冲带的俯冲增生杂岩楔的原始形成方式与史密斯地层学的&层序叠覆律&老下新上的顺序正好相反,其混杂岩增生方式是老的&片体&在上,新的&片体&阶段性拼贴在老的&增生片体&的斜下方,这种增生片体的原始位置亦与&原始水平律&相悖,即增生片体一般保持较高角度倾斜;在岩石类型和变质程度上,造山带海相和古陆缘火山岩以及变质岩普遍发育,尤其是超基性、基性岩系分布广泛,变质作用较强,伴有从百余公里以下深部超高压变质岩片的折返和同造山期与造山后期岩浆活动,构成极为复杂的地质景观。
- 更多网络解释与超基性的相关的网络解释 [注:此内容来源于网络,仅供参考]
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biotite:黑云母
方解石(calcite) 碳酸钙矿物. ...橄榄岩(dunite) 主要由橄榄石和辉石组成的深成超基性岩浆岩. ...黑云母(biotite) 含铁、镁的云母.
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diopside:透辉石
透辉石(diopside)是辉石的一种,属单斜晶系,它属于硅酸盐矿物.透辉石无色至浅绿色,具有玻璃光泽.长柱体、粒状或片状.成因产状:透辉石和次透辉石是矽卡岩矿物之一,一些基性和超基性火成岩中亦有它们的产出.在高级区域变质作用和热变质作用中,
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dunite:纯橄榄岩
自然铂主要产在基性和超基性的火成岩中,尤其是纯橄榄岩(Dunite)内较为常见. 它的化学性质极不活泼,在自然界中以自然金属状态产出,其耐酸碱的能力特别强,除了热王水外,不溶于任何酸中. 自然铂结晶成等轴晶系,具金属光泽,
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dunite:橄榄岩
方解石(calcite) 碳酸钙矿物. ...橄榄岩(dunite) 主要由橄榄石和辉石组成的深成超基性岩浆岩. ...黑云母(biotite) 含铁、镁的云母.
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ultrabasic:超基性的
ultrabasic rock 超基性岩 | ultrabasic 超基性的 | ultracentrifugal method 超离心法
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ultrabasic rocks:超基岩性
超基性 ultrabasic | 超基岩性 ultrabasic rocks | 超碱的 ultrahaline
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lamprophyre:煌斑岩
可根据粒度再细分为粗粒方煌斑岩类 岩石包括了煌斑岩(lamprophyre)和钾镁煌斑岩(lamproite),b) 拉辉 煌斑岩(odinite)与闪斜煌斑岩矿物组合相似,但更基性些主要由板条状斜长石和褐色或绿金伯利岩(kimberlite)是一种不含长石的偏碱性超基性浅成一超浅成岩石.
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magmatic rock:岩浆岩
岩浆岩(magmatic rock) 由岩浆冷凝而形成的岩石. 变质岩(metamorphic rock) 原有的岩石经变质作用后形成的岩石. 橄榄岩(dunite) 主要由橄榄石和辉石组成的深成超基性岩浆岩. 辉长岩(gabbro) 主要由基性斜长石和单斜辉石组成的深成基性岩
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odinite:拉辉煌斑岩
可根据粒度再细分为粗粒方煌斑岩类 岩石包括了煌斑岩(lamprophyre)和钾镁煌斑岩(lamproite),b) 拉辉 煌斑岩(odinite)与闪斜煌斑岩矿物组合相似,但更基性些主要由板条状斜长石和褐色或绿金伯利岩(kimberlite)是一种不含长石的偏碱性超基性浅成一超浅成岩石.
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ultrabasite:异辉锑铅银矿
ultrabasic /超基性的/ | ultrabasite /异辉锑铅银矿/ | ultracentrifugal /超速离心的/高速离心的/