scholarly journals The ore prospecting prediction model for the Huili copper orefield in Sichuan Province, China

2021 ◽  
Vol 44 (4) ◽  
pp. 417-432
Author(s):  
Lujun Lin ◽  
Hui Chen ◽  
Zhenshan Pang ◽  
Zhizhong Cheng ◽  
Jianling Xue ◽  
...  
Keyword(s):  
Volcanic Rocks ◽  
Geological Model ◽  
Geological Body ◽  
Geological Conditions ◽  
Depth Study ◽  
Ore Prospecting ◽  
Peripheral Areas ◽  
Internal And External Factors ◽  
Prospecting Prediction ◽  
Metallogenic Characteristics

The prediction theory and methodology of ore prospecting were developed from an in-depth study of 129 typical deposits in China. It has been verified to be an effective method that is particularly suitable for the initial ore prospecting. In this method, the internal and external factors of metallogenesis are combined together to construct a geological model of prospecting prediction, which consists of metallogenic geological body, metallogenic structure, metallogenic structural plane and metallogenic characteristics. The Huili area is located in the western margin of the Yangtze Plate, where the regional metallogenic geological conditions are superior, and a series of unique iron-copper deposits were formed. In recent years, great breakthroughs and progress have been made in the deep and peripheral areas of the Huili copper orefield. Herein, we take the Huili copper orefield as a typical example to illustrate the specific application of this method in deep ore prospecting of hydrothermal deposits. The metallogenic geological body is the ore-hosting volcanic rocks (albitite in the Hekou Group), and the main metallogenic structure and structural planes are interfaces between basic (intermediate) volcanic rocks and sedimentary rocks and the possible volcanic vent. Combined with the summary of metallogenic characteristics, we constructed a geological model for ore prospecting in the Huili copper orefield.

scholarly journals Pedogenesis on volcanic rocks in protected landscape areas in Central and North Bohemia

2014 ◽  
Vol 9 (No. 4) ◽  
pp. 153-160 ◽  
Author(s):  
A. Žigová ◽  
M. Šťastný
Keyword(s):  
Soil Cover ◽  
Developmental Process ◽  
Volcanic Rocks ◽  
Clay Fraction ◽  
Chemical Properties ◽  
Parent Material ◽  
Soil Profiles ◽  
Pedogenic Process ◽  
Geological Conditions ◽  
Swelling Clay Minerals

The development of soil cover on volcanic rocks in Central and North Bohemia was analyzed. The study was performed in the protected landscape areas on basalt, andesite, and dolerite. Parent material was characterized on the basis of thin-section study. Petrography of the parent material makes it possible to document the differences in the texture, character, and amount of rock-forming minerals. All the studied sequences exhibit the same configuration of soil profiles but various thicknesses. The soil profiles were evaluated on the basis of particle size distribution, chemical properties, soil organic matter parameters, and mineral composition of clay fraction. The major specific pedogenic process in soils developed on volcanic rocks is weathering of parent material and development of the Bw horizon with the formation of mainly smectite from the group of swelling clay minerals. The results revealed differences in the formation of the Bw horizon which is significantly affected by the petrography of the parent material and local geological conditions. According to the type of volcanic rocks, the intensity of the developmental process of the Bw horizon is as follows: andesite (Týřovické skály) > dolerite (Záhrabská) > basalt (Březina).

scholarly journals Theoretical substantiation of the layout decisions of station complexes of the underground of medium depth (up to 40 m) in the engineering and geological conditions of Saint Petersburg

2019 ◽  
Vol 6 (3) ◽  
Author(s):  
Alexander Ledyaev ◽  
Dmitry Boytsov ◽  
Natalia Ledyaeva
Keyword(s):  
Large Scale ◽  
Transport Infrastructure ◽  
Underground Structures ◽  
Vast Number ◽  
Theoretical Substantiation ◽  
Geological Conditions ◽  
Peripheral Areas ◽  
Time Required ◽  
Water Saturated ◽  
The City

The development of a modern city and the increase in the occupied territory also involves the improvement of its transport infrastructure. In accordance with the sectoral scheme of development of the subway of St. Petersburg and the current backlog of its implementation requires a new approach to the implementation of the plan for the construction of the subway network. This article proposes the concept of space-planning, structural and construction solutions for metro stations of the ring line, as well as for the peripheral areas of the city. Over the past 10 years, there has been a rapid increase in population and active high-rise development of all areas of the city, increasing congestion of both urban and suburban roads, which leads to inefficiency of public and individual transport. For a long time there has been a problem of unloading the existing subway lines and exceeding the uncovered areas by available types of urban passenger transport, the main of which is the subway. To meet the needs of the population in comfortable transportation with minimal time required a large-scale approach to the implementation of the long-term plan for the development of the subway. Engineering-geological conditions of St. Petersburg are characterized by great complexity in the design and construction of underground structures. Water-saturated unstable sandy-clay soils, often of a belt structure, serve as the host medium for the objects of the underground of small and medium depth. The thickness of Quaternary deposits within the city has a large difference of absolute marks and is characterized by great heterogeneity. Relatively favorable conditions for the construction of underground structures are the layers of Cambrian clays, the full capacity of which varies from 12–20 m to 95–126 m relative to the earth’s surface. The root soils are characterized by sufficient density and uniformity with low water flows and moisture, which led to the deep laying of the vast number of station complexes and distillation tunnels of the St. Petersburg metro.

scholarly journals Three-dimensional engineering-geological model of the soil massif: the case study of the base of a hydrotechnical building

2018 ◽  
Vol 7 (1) ◽  
pp. 45
Author(s):  
Zhanghao Ren
Keyword(s):  
Three Dimensional ◽  
Geological Model ◽  
Sound Design ◽  
Three Dimensional Model ◽  
Construction Sites ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Geological Conditions ◽  
Dimensional Models ◽  
Three Dimensional Models

In the process of engineering and geological surveys, three-dimensional engineering-geological modeling makes it possible to perform a comprehensive assessment of the state of the territory for making sound-design decisions on the placement of construction sites and their structures. Secondly, a logical conclusion of a detailed study of engineering-geological and geotechnical conditions, which is implemented to use three-dimensional modeling, is a well-grounded design with a reasonable margin of safety, which causes a reduction in the total cost of the erected or reconstructed structure. Thirdly, in comparison with traditional engineering-geological two-dimensional models (cuts, maps, etc.), three-dimensional models give more information. This is especially important, when we think about the scale of the hydraulic structures. According to archival materials, it can be noted that there are many spatial geological heterogeneities in this territory, and the engineering-geological conditions turned out to be complex. Taking into account the advantages of three-dimensional modeling, the creation of a three-dimensional model of a dispersed soil massif is an actual task for solving complex engineering-geological problems. The article analyzes a three-dimensional engineering-geological model of the soil massif under a hydrotechnical building in the Moscow region, and then calculates its stress-strain state and the coefficient of stability of the sides of the ditch.

Application of Geophysical and Geochemical Exploration Results in Prospecting Prediction: Taking Pangjiagou-Xiajinbaogou Au-Ag Polymetallic Ore in Hebei Chengde as an Example

2013 ◽  
Vol 807-809 ◽  
pp. 2192-2196 ◽  
Author(s):  
Dong Wang ◽  
Yong Feng Yan ◽  
Jiao Jiao Chen
Keyword(s):  
Binding Studies ◽  
Target Region ◽  
Quartz Veins ◽  
Indirect Sign ◽  
Geological Conditions ◽  
Characteristics Analysis ◽  
Prospecting Prediction ◽  
Polymetallic Ore ◽  
Analogy Prediction ◽  
Middle Proterozoic

Pangjiagou-xiajinbaogou Au-Ag polymetallic ore in Hebei Chengde magmatic activity is very strong, mainly Late Jurassic - Early Cretaceous of granite and Late Yanshanian alteration of acidic rocks, archean metamorphic rocks and Middle Proterozoic strata containing mainly gold seam. Studies show that the area is insignificant on main rock resistivity, and all kinds of mineral body, mineralized rocks Fs> 2.4%, gneiss containing high gold abundance, gold body, auriferous quartz veins are greater than 2.4% Fs,can be used as an indirect sign on geophysical prospecting. Sb, As, Pb, Ag, Au and other elements of the exception can be used as indirect signs on geochemical prospecting. After considering this area geophysical, geochemical characteristics analysis of, binding studies geological conditions, prospecting method using the analogy prediction target region, the success of the orebody found.

Application of Geophysical Exploration Results in Prospecting Prediction at Xiayingfang Silver Polymetallic Deposit in Chengde, Hebei Province

2013 ◽  
Vol 405-408 ◽  
pp. 607-610
Author(s):  
Chun Zhong Ni ◽  
Dong Wang
Keyword(s):  
North China ◽  
Mining Area ◽  
North China Platform ◽  
Northern Margin ◽  
Ore Bodies ◽  
Metallogenic Belt ◽  
Geological Conditions ◽  
Group A ◽  
Fault Belt ◽  
Prospecting Prediction

Xiayingfang mining area in the structure of the earth is part of north China platform of Inner Mongolia axis and yanshan fold belt, which belong to the northern margin of north China platform polymetallic metallogenic belt. Give priority to with silver polymetallic minerals, in the area are mainly distributed at Xiayingfang - Dongshan fault belt and its two side. Ore bodies occur mainly in group a bar at the bottom of the Tuanshanzi group banded dolomite and dolomitic limestone. After analyzing the characteristics of geophysical prospecting in the area, combined with the study of geological conditions, it is good for further prospecting.

scholarly journals Groundwater quality in Ponjong Karst, Gunungkidul Regency, Special Region of Yogyakarta

2020 ◽  
Vol 1 (1) ◽  
pp. 7-11
Author(s):  
Avellyn Shintya Sari ◽  
Sari Bahagiarti K ◽  
Suharsono Suharsono ◽  
C Prasetyadi
Keyword(s):  
Volcanic Rocks ◽  
Active Volcano ◽  
Research Area ◽  
Geological Structure ◽  
Groundwater Exploration ◽  
Geological Mapping ◽  
Karst Area ◽  
Aquifer System ◽  
Aquifer Systems ◽  
Geological Conditions

The hydrogeological condition of a region is determined by the type of lithology, morphology, and subsurface conditions where the condition is very helpful in the study of groundwater exploration. Especially when we encounter interesting geological conditions when the groundwater exploration in the karst area in which volcanic rocks are resulting from the activities of the active volcano in the past. Groundwater exploration at Ponjong area and surrounding does have its special characteristics, because it has 2 different rock characteristics where the northern part of the research area in the form of a karst area (limestone of Wonosari Formation) while the southern part is an area of ancient volcanoes with dominant volcanic rocks from Wuni Formation, As for the research on the above and subsurface research area where the research is conducted based on surface geology mapping, geoelectric data collection, and groundwater sampling. Geological mapping includes geomorphological data, stratigraphy, and geological structure. The aquifer system of the research area can be divided into two systems, inter-grain aquifer systems, and fracture aquifer systems. Overall quality groundwater in the research area is quite good. Ponjong District there are mining activities that have resulted in changes in the land use system in the area. This can cause changes in the water surplus in the area due to the changing catchment area.

scholarly journals Characteristics of the Roof Behaviors and Mine Pressure Manifestations During the Mining of Steep Coal Seam

2017 ◽  
Vol 62 (4) ◽  
pp. 871-891 ◽  
Author(s):  
Tu Hong-Sheng ◽  
Tu Shi-Hao ◽  
Zhang Cun ◽  
Zhang Lei ◽  
Zhang Xiao-Gang
Keyword(s):  
Coal Seam ◽  
Field Measurement ◽  
Main Roof ◽  
Mine Pressure ◽  
Steep Seam ◽  
Working Face ◽  
Geological Conditions ◽  
Depth Study ◽  
Dip Angle ◽  
Similar Simulation

Abstract A steep seam similar simulation system was developed based on the geological conditions of a steep coal seam in the Xintie Coal Mine. Basing on similar simulation, together with theoretical analysis and field measurement, an in-depth study was conducted to characterize the fracture and stability of the roof of steep working face and calculate the width of the region backfilled with gangue in the goaf. The results showed that, as mining progressed, the immediate roof of the steep face fell upon the goaf and backfilled its lower part due to gravity. As a result, the roof in the lower part had higher stability than the roof in the upper part of the working face. The deformation and fracture of main roof mainly occurred in the upper part of the working face; the fractured main roof then formed a “voussoir beam” structure in the strata’s dip direction, which was subjected to the slip- and deformation-induced instability. The stability analysis indicated that, when the dip angle increased, the rock masses had greater capacity to withstand slip-induced instability but smaller capacity to withstand deformation-induced instability. Finally, the field measurement of the forces exerted on the hydraulic supports proved the characteristics of the roof’s behaviors during the mining of a steep seam.

Research on Technology of Building Three-Dimensional Geological Simulation Model by Octree Algorithm Method

2013 ◽  
Vol 456 ◽  
pp. 591-594
Author(s):  
Shuo Mei Wu ◽  
Yan Kun Wang ◽  
Jian Wei Song ◽  
Xu Ning Liu
Keyword(s):  
Three Dimensional ◽  
Geological Structure ◽  
Volume Element ◽  
Structure Modeling ◽  
Geological Modeling ◽  
Geological Body ◽  
Multi Scale ◽  
Modeling Problem ◽  
Geological Conditions ◽  
Subdivision Algorithm

Accurate terrain data should be obtained in order to research geological structure modeling problem, and it is difficult to truly reflect the form of three-dimensional geological body by traditional three-dimensional spatial data model method. By taking geological structure modeling problem as research object, this paper analyzes geological modeling principles, builds the volume element model of octree subdivision algorithm, proposes to build a three-dimensional geological body by octree subdivision algorithm based on multi-scale, meets the needs of multi-scale organization of data as well as multi-scale division of geological bodies and attributes based on the geological object expression of octree subdivision algorithm, establishes the links between various geological objects through spatial volume element, lays a good foundation for spatial analysis and provides data support for the three-dimensional visualization of geology. The results of simulation experiment show that the proposed geological modeling method through octree subdivision algorithm is accurate and efficient, and it can adapt to the construction of three-dimensional complex geological model under common complex geological conditions and reflect the true form of three-dimensional geological body.

scholarly journals Life-Cycle Performance Assessment and Distress Prediction of Subgrade Based on an Analytic Hierarchy Process and the PSO–LSSVM Model

2020 ◽  
Vol 10 (21) ◽  
pp. 7529 ◽  
Author(s):  
Qi Li ◽  
Yimin Wang ◽  
Kunbiao Zhang ◽  
Zhiyuan Cheng ◽  
Ziyu Tao
Keyword(s):  
Life Cycle ◽  
Analytic Hierarchy Process ◽  
Performance Assessment ◽  
Cycle Performance ◽  
Support Vector ◽  
Analytic Hierarchy ◽  
Geological Conditions ◽  
Internal And External Factors ◽  
Whole Life Cycle ◽  
Hierarchy Process

The subgrade performance assessment and targeted maintenance of a highway during operation is very important and challenging. This paper focuses on the performance of the whole life-cycle of a highway subgrade during the operational period. Four roads with different traffic volume and geological conditions were selected; 20 test sections of these 4 roads were examined for a three-year distress survey, and 18 specific subgrade distresses of the 5 assessment objects were tracked and collected. First, based on the analytic hierarchy process (AHP), the subgrade performance of the selected section is evaluated, and the subgrade performance index (SPI) at different time periods is obtained. Then, based on the internal and external factors which affect the subgrade, three algorithms to determine the optimal support vector machine (SVM) model were proposed to train and predict the SPI. The results show that the SPI predicted results based on the data time series and particle swarm optimization–least squares SVM (PSO–LSSVM) model are better than those based on grid search (Grid-SVM) and genetic algorithm (GA-SVM) models. Finally, this paper provides a detailed idea for the rational layout of subgrade life-cycle assessment and decision-making by establishing a subgrade performance assessment–prediction–maintenance–management architecture system.

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