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regional ore controlling
相关语句
  区域控矿
     REGIONAL ORE CONTROLLING CHARACTERISTICS OF GOLD AND ANTIMONY DEPOSITS IN CENTRAL HUNAN
     湘中金、锑矿床区域控矿特征研究
短句来源
     The paper comprehensively and deeply study and deal with regional geological setting,regional ore controlling conditions and rules in East Hunchun District of Jilin Province for the first time. Author set up the regional metallogenetic model of gold deposits finally.
     首次系统深入研究了吉林省珲春东部金矿区的成矿地质背景、区域控矿条件和控矿规律 ,建立了金矿区域成矿模式
短句来源
  相似匹配句对
     REGIONAL ORE-FORMING BACKGROUND
     区域成矿地质背景
短句来源
     It is important to exploit the regional gold ore.
     对区域金矿的开发利用具有重要借鉴意义
短句来源
     TUNGSTEN DEPOSITS RELATED TO REGIONAL METAMORPHISM AND ORECONTROLLING FACTORS
     与区域变质作用有关的钨矿床及控矿因素
短句来源
     The Gold in the Ore
     矿藏里的金子
短句来源
     regional blockade;
     地区封锁;
短句来源
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Based on the accumulation of the geological and geophysical data for many years, the geological interpretation on the regional gravity and magnetic anomalies in Nanling area of southern China is put forward in this paper as follow: Ⅰ. There are distinct gravity and magnetic anomalies indicating the fracture tectonics, and the enormously extensive gravity gradient indicating the large fracture zone at depth. On these grounds, in accordance with the extension and distribution of the fractures, they can...

Based on the accumulation of the geological and geophysical data for many years, the geological interpretation on the regional gravity and magnetic anomalies in Nanling area of southern China is put forward in this paper as follow: Ⅰ. There are distinct gravity and magnetic anomalies indicating the fracture tectonics, and the enormously extensive gravity gradient indicating the large fracture zone at depth. On these grounds, in accordance with the extension and distribution of the fractures, they can be classified into four fracture series, namely, (1) Wuling Mount fracture series; (2) Hunan—Guangxi fracture series; (3)Wuyi Mount fracture series; (4)Pearl River—Chaozhou—Shantou fracture series. And they are specifically divided into 41 fracture zones to provide geophysical basis for the investigation of fracture tectonics in Nanling area. Ⅱ. It is capable to lay stress on the effect of the geological factors at depth, and reduce the interferences resulted in the complex geological features on the surface in dividing the geotectonic elements by regional gravity and magnetic anomalies. Due to the inadequate details of the current gravity and magnetic data, the geotectonic elements are divided up to third order in this paper. It would not be favorable to advance the more detail classification until much more informations would have been accumulated. Ⅲ. The regional ore-controlling fraetors for some endogenetic metallic deposits can be distinguishedly reflected by the regional gravity and magnetic anomalies: 1. All the large ore fields are located on the gravity gradient zone, and in many cases associated with clear negative gravity anomalies. This characteristic of the gravity field represente two types of geological features: (1) The gravity gradient zone indicates the occurrence of large fracture at depth. (2) The local negative gravity anomalies are in many cases caused by hidden and semi-hidden granite masses. Both geological features mentioned above play an important role in ore formation. 2. Covering almost all the large endogenetic metallic deposits there are distinct local aeromagnetic anomalies. 3. Aeromagnetic "high magnetization zone", indicating the large extention of mineralization and alteration, is an important criteria for minerogenetic prognosis. 4. The hidden rock mass and granitic contact alteration zone which are reflected by the gravity and magnetic anomalies can afford the favorable spatial position of ore formation for minerogenetic porgnosis. 5. Being able to sieve the mineralized and altered fracture zones out of the numerous ones on the surface, the chain of the short-axis aeromagnetic anomalies are of great significance for minerogenetic prognosis. In general, the specific geological conditions are needed for the formation of large-scale ore deposits. It follows that the geophysical anomalies will correspondently be induced by the specific variations of the geological factors. On the basis of the regional gravity and magnetic anomalies we obtained reflecting some regional ore-controlling factors, on which a rather detailed demonstration has been given, and a viewpoint on minerogenetic prognosis has also been proposed in this paper. Therefore, it is worth for reference in reconnaissance survey and prospecting in Nanling area henceforth.

本文根据多年积累的地质、地球物理资料,对中国南岭地区的区域重磁异常提出了如下地质解释:1.断裂构造有清晰的重磁异常反映,规模巨大的重力梯度带反映深大断裂带。按断裂展布特征,划分成4个断裂系,即①武陵山断裂系;②湘桂断裂系;③武夷山断裂系;④珠江潮汕断裂系,并具体划出了41条断裂带,为研究南岭断裂构造提供了地球物理依据。2.根据区域重磁异常划分大地构造单元能突出深部因素的作用,减少复杂的表层地质现象造成的干扰,由于资料所限,本文只划分到第三级大地构造单元,更细致的划分待积累更多资料后才宜进行。3.区域重磁异常能突出反映某些内生金属矿床的区域控矿因素:①大矿田都位于重力梯度带上并有明显的重力负异常伴生,这种重力场特征反映两种地质现象,a.前者标志深大断裂带的存在,b.后者往往是隐伏一半隐伏花岗岩体引起。这两者都对矿产形成有重要作用。②几乎所有的大型内生金属矿床上都有明显的航磁局部异常。③航磁“高磁区”是大范围矿化蚀变的反映,是成矿预测的一种重要标志。④重磁异常反映的隐伏岩体及花岗岩接触变质带,能为成矿预测提供有利于成矿的空间位置。⑤短轴串珠状航磁异常,能从地表众多的断裂带中筛选出有矿化蚀变的断裂带,对成矿预测有重...

本文根据多年积累的地质、地球物理资料,对中国南岭地区的区域重磁异常提出了如下地质解释:1.断裂构造有清晰的重磁异常反映,规模巨大的重力梯度带反映深大断裂带。按断裂展布特征,划分成4个断裂系,即①武陵山断裂系;②湘桂断裂系;③武夷山断裂系;④珠江潮汕断裂系,并具体划出了41条断裂带,为研究南岭断裂构造提供了地球物理依据。2.根据区域重磁异常划分大地构造单元能突出深部因素的作用,减少复杂的表层地质现象造成的干扰,由于资料所限,本文只划分到第三级大地构造单元,更细致的划分待积累更多资料后才宜进行。3.区域重磁异常能突出反映某些内生金属矿床的区域控矿因素:①大矿田都位于重力梯度带上并有明显的重力负异常伴生,这种重力场特征反映两种地质现象,a.前者标志深大断裂带的存在,b.后者往往是隐伏一半隐伏花岗岩体引起。这两者都对矿产形成有重要作用。②几乎所有的大型内生金属矿床上都有明显的航磁局部异常。③航磁“高磁区”是大范围矿化蚀变的反映,是成矿预测的一种重要标志。④重磁异常反映的隐伏岩体及花岗岩接触变质带,能为成矿预测提供有利于成矿的空间位置。⑤短轴串珠状航磁异常,能从地表众多的断裂带中筛选出有矿化蚀变的断裂带,对成矿预测有重要意义。总之,大矿的形成需要特殊的地质条件,而地质因素的特异变化就会产生相应的地球物理异常现象。本文根据区域重磁异常所显示的一些区域控矿因素作了较详细的阐述,提出了成矿预测意见,对南岭地区今后的普查找矿工作具有参考价值。

Taking the Dashiqiao ore deposit as an example, this paper deals with some of the important geological features of dolomite-hosted sparry magnesite deposits including regional ore-controlling factors, conditions governing shapes of orebodies, wall rock alterations associated with thermal halos, and contraction structures.There are three critical parameters governing the localization of magnesite deposits, i. e., dolomite containing high sili(?)eous materials and a little sedimentary megnesitic...

Taking the Dashiqiao ore deposit as an example, this paper deals with some of the important geological features of dolomite-hosted sparry magnesite deposits including regional ore-controlling factors, conditions governing shapes of orebodies, wall rock alterations associated with thermal halos, and contraction structures.There are three critical parameters governing the localization of magnesite deposits, i. e., dolomite containing high sili(?)eous materials and a little sedimentary megnesitic substances, strong compressive belt and Proterozoic migmatite. Generally speaking, the CaO/MgO ratio of most of unaltered dolomites varies from 1.5 to 1.25, while the SiO_2 content from 2.98 to 21.69%. Magnesite deposits are developed usually along three main strong compressive strike fault zones in the area, and there also exists a field of low and gentle magnetic anomalies. In the northern part of this magnetic field lie outcrops of Proterozoic migmatite which contains unevenly scattered accessory magnetites, while in the southern part, exposed magnesite deposits are seen. It is supposed that there may exist concealed migmatite below the magnesite deposits. In the eastern part of the area, if merely one or two of these three parameters are present, no orebody or only small and very lean orebodies can be discovered. The magnesite deposits have two shapes of orebodies, i. e., stratiform or stratoid and irregular. The fomer is formed in connection with impermeable phyllite barriers and bedding fractures, while the latter only with compressive-shear zones with no phyllite barrier.Five sorts of wall rock alteration are discerned, i. e., magnesitization, desilication. talcization, decolorization and dolomitization. Magnesitization known as (?)nagnesite replacing dolomite is frequently accompanied with desilication which. reduces the SiO_2 content of magnesite to the extent of being lower than that of dolomite. Talcization finds expression in the replacement of silicate rocks or minerals by talc or the formation of different-colored talc veins of various generations. The rock alterations are all associated with thermal halos whose margins show decolorization. The dolomitization is manifested by the formation of dolomite veins. The homogenization temperatures of gas-liquid inclusions in bladed magnesite are in the range of 230-300℃,whereas those of rhombohedral magnesite are around 150℃.The contraction structures, which comprise collapse breccia, tensile brecciated zones, tensional fractures and tensional network fissures, may be formed as a result of volume contraction during the replacement of dolomite by magnesite. Collapse structures and brec ciated zones result from the cementation of breccias of altered dolomite, fine-grained magnesite, talcized rocks and talcs by dolomite crystals, medium-to coarse-grained magnesite or leucocratic talc. Tensional fractures and network fissures are usually filled with magnesite or dolomite, forming veins.From the above discussion, this paper advances a polygenic hypothesis of evaporation-sedimentation followed by hydrothermal enrichment.

大石桥晶质菱镁矿产于含方柱石及微含沉积菱镁质的中元古代硅质白云岩中,受区域挤压带控制,与元古代混合岩有空间联系。受千枚岩遮挡层和层间断裂控制时,矿体成层状,否则成不规则状。围岩具脱硅化、菱镁矿化及滑石化等蚀变,具热晕。成矿温度介于240—370℃之间。因白云石变成菱镁矿时体积有收缩,故出现收缩构造,如张性角砾岩和张性断裂等。角砾岩胶结物中有菱镁矿和滑石。成矿热液为贫硅富镁碱性热液,晚期转为含硅酸性热液。矿床成因为(蒸发)沉积-热液富集。

Based on the detailed studies of the typical contact structure systems of Fengshandong, Tonglushan ,and Tieshan igneous intrusions in the working area,referred to other research results in home and abroad, the three types of contact structure systems at the different crustal levels have been suggested on the different magmatic emplacement conditions and mechanism. The regional ore-controlling model has been established combining with petrogenetic and minerogenetic series.

在详细研究了工作区内的丰山洞、铜录山、铁山岩体等代表性接触构造体系的基础上,结合国外某些地区的研究成果,以岩浆侵入的地质环境和岩体定位机制为依据,建立了浅、中、深3种不同层次接触构造体系,并结合成岩成矿系列的研究,提出该区构造控岩控矿模式。

 
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