查询词典 Archean

The author puts forward that the forming of the Shihugold deposit is of the characteristics of multistage geotectonic evolution,multisource ore- forming materials, multiore- controlling factors,multimineralization, multigenesis typle. Controlled by the fault belt, theShihu gold deposit is a polygenetic compound ore deposits which wasformed in the Archean mesometamorphic rock and reconstructed bymixed hydrothermal in Yanshan Epoch. And a related minerogeneticmodel has been set up.

将矿床成矿作用与大地构造演化阶段联系起来，详细地阐述了石湖金矿床的成矿机理，认为矿床的形成具多大地构造演化阶段，多成矿物质来源、多控矿因素、多成矿作用和多成因类型的特点，提出石湖金矿床属产于太古代中级变质岩系、受断裂破碎带控制的燕山期岩浆改造混合热液型多因复成金矿床，并建立了与之相适应的成矿模式图。

It occurs stratigraphically within metamorphosed Archean sedimentary rocks and has many characteristics of syngenetic stratiform deposit:very regular shape of ore bodies, homogeneous distribution of gold in ore formation, large reserve and close association with beded barite.

赫姆洛金矿在太古代晚期地层中沿层产出，矿体形状规则、规模巨大，矿石品位均匀，具有同生层状矿床的特征。

Targeted at providing design and engineering services on a global basis, the Anglo-Italian collaboration is founded on a lean business model that aims at offering high quality at a very competitive cost.

提供有针对性的设计和工程服务，在全球范围内，英国与意大利的合作是建立在一个精干的业务模式 ARCHEAN.net版权所有，其目的是提供高质量和极具竞争力的成本的设计。

Now our company has managed to develop the collet chuck and guide bush of carbide with wear-resistant weld in good precision.

目前已成功研制开发了精密耐磨 ARCHEAN.net版权所有，镶嵌有硬质合金的夹头和夹套。

Such features are typical of ancient lower continental crust, e.g., Archean granulite terranes that experienced extensive U-Th loss and developed time-integrated low radiogenic Pb compositions. The occurrence of the west Ujimqin andesites indicates the existence of ancient continental lower crust beneath the NE China fold belt.4 The Mesozoic granitoids in the Zhangguangcai Range and Jiamusi block have lower Nd ε_(Nd =-3.5～+ 2.1, T_ = 1.0～1.27Ga and highly radiogenic Pb and Sr isotopic composition ~(206Pb/~(204)Pb = 18.4～18.9,~(87)Sr/~(86)Sr = 0.705～0.711, suggesting that the pelagic sediments of the Paleo-Asian Ocean or their metamorphosed derivates were an important component in the region.5 The Pb isotope mapping results show that the mafic rocks in the northern Hinggan Mountains have higher and weakly variable ~(206)Pb/~(204)Pb ratios than those from the southern Hinggan Mountains and the Liaoyuan-Yanji area.

该套岩石的出现为证明东北地区存在古老大陆下地壳提供了重要证据。4张广才岭-佳木斯地区中生代花岗岩表现出低ε_(-3.5～+2.1)、高T_(1.0～1.27Ga)和高放射成因Sr~(87Sr/~(86)Sr=0.705～0.711和Pb同位素组成~(206Pb/~(204)Pb=18.4～18.9，反映了古亚洲洋远洋沉积物或变沉积岩为区域地壳的重要组分之一。5同位素填图结果表明，大兴安岭北区基性火山岩表现出较高且变化小的~(206)Pb/~(204)Pb比值；而南兴安岭-辽源-延吉地区中生代基性火山岩整体上表现出相对北区低~(206)Pb/~(204)Pb同位素比值特征。

Based on the a series of research carried in typical gold lodes in Linglong, Jiapigou, Dongfeng and Xiaoqinling and related data, it is suggested that the deposit type is concentrated in the circumference of the North China Platform, occurring in the Archean granite-greenstone belts, being adjacent to deep-cut faults and being accompanied by the Mesozoic, remelted l-type granites. The spatial distribution features of the deposit type indicate that the deposits are closely related to the multiple evolution of the mantle plumes.

通过对玲珑、夹皮沟、东风和小秦岭等典型中深脉状金矿及相关资料的研究表明：中深脉状金矿主要分布于华北地台的周边，位于太古代花岗—绿岩带中，与深大断裂相邻，同中生代重熔I型花岗岩伴生，这种空间展布特征与地幔的多级演化有关。

The granulite xenoliths, as the product of basaltic underplating and the representative of the present-day lower crust, are different from the local Archean granulite terrains There is a systematic variation of Sr-Nd isotopes from the granulites to the pyroxenites and the peridotites, indicating the possible crust-mantle interaction beneath Hannuoba area.

麻粒岩类捕掳体所代表的年轻大陆下地壳为玄武质底垫作用的产物，与麻粒岩地体所代表的古老大陆下地壳不同。橄榄岩类捕掳体则具亏损特征，辉石岩类捕掳体的性质介于麻粒岩类和橄榄岩类捕掳体之间，但石榴子石辉石岩显示了其特殊性。

Magnetic sus- ceptibility of these formations was obviously lower than the Archean high-graded metamorphic crystalline basements, while the responding ductile shear zones created enhanced anisotropy magnetic susceptibility attributed to their penetrative mineral lineations, both of them contributed to the crustal scale NEE-NNE striking linear aeromagnetic anomalies.

不同规模的古元古代活动带彼此并不相连，以发育变质沉积-火山岩建造为主体，岩石磁化率明显低于太古宙高级变质结晶基底，与之相关的韧性剪切带则以其透入性矿物线理产生了增强的磁化率各向异性，两者共同构建了地壳尺度北东东-北北东向线性航磁异常带。

The gold lodes in the Dongwujiazi gold deposit are mainly hosted in the metamorphic complex of the Archean Xiaotazigou Formation,Jianping Group.

东五家子金矿矿脉主要围岩为太古宙建平群小塔子沟组变质杂岩，矿床距燕山期石英二长岩南约6km。

Important significance of regional tectonic regime to metallogenic capacity of Indosinian and Early Yanshanian granites in southeastern Hunan:A case study of Qianlishan and Wangxianling plutons;2. Yanshanian movement and conversion of tectonic regime s in East Asia;3. The Sm-Nd isotopic results indicate that the Archean tectonic regime and crust growth in Northern China Platform can be divided into two stages.

Sm－Nd同位素研究结果显示，华北地台太古宙构造体制与地壳生长可分为二个发展阶段：2800Ma以前，地壳以幔源物质垂向增生为主；进入2800Ma以后，地壳物质开始进入地幔，并以水平运动为主要构造体制，反映板块构造机制在太古宙晚期地质演化中具有十分重要的作用。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。