In this study, passive source seismology is used to systematically detect the metallogenic background of the ore concentration area. Therefore, 20 broadband seismic observation points are arranged in Jiama Qulong ore concentration area. The observation period is more than 12 months. The wide-band seismograph arranged in a plane is the integrated wide-band seismograph of nanomatrics horizon in Canada and cmg-3tde in the UK. The data format is minified. Before the actual field data acquisition, the seismometer, digital collector, GPS antenna and continuous power supply system used in the field data acquisition were tested before construction in Fuzhou City, Jiangxi Province, so as to ensure that the instrument can work normally in the field work. Most of the stations are located where the environmental interference is as small as possible to minimize the signal interference caused by human or other natural vibrations. However, due to the observation in the ore concentration area, some observation points cannot be avoided. Considering that the work area is located in Tibet, China, with strong light and large interference, in order to ensure high-quality and continuous waveform records on the basis of reducing instrument risks, we adopted the method of digging a pit to build a platform foundation, and established a platform foundation with unified specifications for each instrument. First, dig a large pit with a diameter of 80-90 cm and a depth of about 80 cm at the location where the station is to be arranged. Before digging the pit, ensure that the underground soil is the original soil rather than backfill. When digging the pit, it is best to dig the bedrock. Secondly, after the pit is excavated, arrange a prefabricated cement pier with a thickness of about 20cm and a diameter of about 30cm, then prepare a large plastic bucket with a volume of 200 L, dig holes at the bottom of the bucket, insert the bucket bottom after digging into the cement pier to the greatest extent, and then tamp it with cement or in-situ soil around the cement pier, And punch holes at the appropriate position where the barrel top is higher than the ground as the cable inlet and outlet. When the seismometer is put into the big bucket, a small bucket shall be buckled upside down on the seismometer to ensure that the seismometer is isolated from the small bucket. Finally, fill the inverted bucket and the upright bucket with high-strength sponge, stubborn. There are two advantages: first, it can isolate the seismometer and ensure the stability of internal temperature and pressure conditions; Second, it can ensure the stability of the environment in the barrel and reduce the background noise. Before installing the seismometer, the surface of the cement pier shall be dried first to ensure good contact between the supporting foot of the seismometer and the installation surface. Then use the geological compass for accurate orientation, mark the cement surface with plastic ruler, marker pen and other tools, and draw the pointing line. The pointing line should preferably pass through the center where the seismometer will be placed. After determining the orientation, place the seismometer on the drawn azimuth scale line, and rotate the seismometer to make the copper pointer at the bottom consistent with the pointing line (the copper pointer points to the East). It should be noted that the compass is easily affected by ferromagnetic objects during orientation. Therefore, the compass should be slightly away from sensors, iron tools, etc. Thirdly, connect the corresponding wire to the seismometer and wrap it around the instrument on the cement surface for several weeks. Finally, adjust the sensor foot screws to make the bubbles center and lock the screws. The broadband mobile seismic station observation adopts the continuous waveform recording method for data acquisition, the sampling rate is 100sps, and the GPS continuous signal receiving method is used for positioning, timing and clock calibration.
HE Rizheng
Pusangguo is a high-grade copper polymetallic deposit dominated by skarn. It is the only large copper lead zinc cobalt nickel deposit in the Gangdise metallogenic belt (GMB); There are few records of magmatic rocks related to the deposit, and its petrogenesis and geodynamic background are not clear. In order to explore these problems, we provided zircon u – Pb ages, Hf isotope, whole rock geochemistry and Sr – nd – Pb isotope data of Busan fruit biotite granodiorite (PBG) and Busan fruit diorite porphyrite (PDP) in the deposit. Entrusted the analysis and testing center of Beijing Institute of geology of nuclear industry and the State Key Laboratory of geological process and mineral resources of China University of Geosciences (Beijing); The fresh rock samples were ground to 200 mesh without pollution for analyzing the main and trace elements and Sr nd Pb isotopic values of the whole rock. Zircon U-Pb Dating: Zircon was glued to the slide with double-sided adhesive, covered with PVC ring, and then epoxy resin and curing agent were fully mixed and injected into the PVC ring. After the resin is completely cured, the sample target is stripped from the glass slide, ground and polished, and then the sample on the target is photographed by reflected light and transmitted light under microscope and cathode fluorescence photography. According to the cathodoluminescence, reflected light and transmitted light photos of zircon, the appropriate (interested) zircon dating domain is selected. The data results are good.
LI Zhuang , WANG Liqiang
The amount of new copper predicted potential mineral resources in Jiama mining area consists of three parts: 1) the amount of new copper predicted potential mineral resources in skarn main ore body; 2) Copper in the mogulang anomaly area predicts the amount of potential mineral resources; 3) Copper in xiangbeishan anomaly area predicts the amount of potential mineral resources. The predicted resources of skarn type main ore body are mainly based on the original 334 level resources formed by extrapolation of the ore body controlled by drilling engineering. The data such as small weight and copper grade (0.72%) used in the estimation of ore body resources are consistent with the relevant ore characteristics of skarn type main ore body, and the estimation result is 1.99 million tons. The mogulang anomaly area is mainly the prospecting target area delineated by 1 ∶ 10000 rock geochemical survey in the northeast of the ore body. The target area is about 3km2. The element combination in the target area is cu-mo-w-bi-ag. The element anomaly is well combined and the content of Cu element is high. The estimated volume of porphyry copper mineralized body is 112922473.2m3, the standard of porphyry ore is 2.341t/m3, and the estimated ore volume is 264351509.8 tons. The average grade of copper in mineralized body is calculated as 0.3% of the average grade of Jiama porphyry ore body. It is calculated that the predicted potential mineral resources of copper in mogulang target area is 793000 tons. Xiangbeishan anomaly area is mainly the prospecting target area delineated by 1 ∶ 10000 rock geochemical survey in the South and west of the main ore body. The target area is about 2km2, the internal element combination is cu-mo-w-bi-ag, the element anomaly is well nested, the Cu element content is high, the estimated porphyry copper mineralization volume is 329733308.3m3, and the ore weight is small. The standard of porphyry ore is 2.341t/m3, The estimated ore volume is 771905674.8 tons. The average grade of copper in mineralized body is calculated as 0.3% of the average grade of Jiama porphyry ore body. It is calculated that the predicted amount of potential mineral resources of copper in mogulang target area is 2.316 million tons. The total estimated resources of three different ore (chemical) sections are 199 + 79.3 + 231.6 = 5.099 million tons. The quality of data results is good, and the goal of submitting the prediction of potential mineral resources of new copper is 5 million tons.
WANG Liqiang
Combining the revealed shallow geological and deep geophysical data in three-dimensional space for deep prediction can not only deepen the shallow understanding, but also reduce the problems caused by the multi solution of geophysics. It has become a new trend and important means of deep metallogenic prediction Taking the Wandongshan ore section of Beiya gold deposit as an example, the three-dimensional geological model of Wandongshan ore section is established in the three-dimensional modeling platform by collecting the data of drilling, exploration line section, geochemical exploration and geophysics; Based on the modeling results and integrating the surface, shallow and deep gravity data, the metallogenic geological conditions and deep metallogenic potential are studied and analyzed. Three metallogenic favorable elements of concealed fault, porphyry body and qingtianbao formation sandstone are selected, and the three-dimensional body model of metallogenic favorable area (sgrid) is established accordingly On this basis, the multi-source information synthesis method is adopted to collect the favorable metallogenic areas of three metallogenic control elements, and the deep target area within 1100 ~ 900 m above sea level in Wandongshan ore section is delineated, which provides a reference for the prediction of the deep target area of the surrounding same type of ore section
ZHOU Fang , WANG Liqiang
This subject takes the porphyry skarn epithermal copper polymetallic deposit in the important metallogenic belt of Tibet as the research object, and comprehensively investigates and studies the development characteristics of its deep magma, structure, fluid alteration and mineralization system based on the preliminary exploration and research results of important ore (concentration) areas, so as to effectively dissect the metallogenic system structure of key mining areas. This paper focuses on the fine anatomy of the coupling relationship between the ore controlling structure of duolong porphyry epithermal copper gold deposit and the magmatic mineralization alteration system formed from the late stage of ocean crust subduction to the stage of continental soft collision; At the same time, the formation, transformation and preservation mechanism of its metallogenic system are comprehensively studied to form a prospecting prediction demonstration. This paper dissects the three-dimensional structure of Beiya porphyry copper gold metallogenic system formed in the transformation stage of India Eurasia collision strike slip structure, so as to accurately grasp its metallogenic process and effectively realize the positioning prediction of deep ore bodies. The magma, hydrothermal evolution fluid migration metal precipitation mechanism and ore-forming fluid migration process of Jiama porphyry metallogenic system are dissected by means of traditional deposit science and non-traditional potassium and magnesium isotopes, so as to establish the magmatic fluid evolution model of the deposit and realize the prospecting prediction. Finally, based on the exploration results of Jiama Qulong ore concentration area, junuo, Xiongcun ore concentration area, zhaxikang cuonadong ore concentration area and duolong ore concentration area, the effective exploration technology and method combination of the metallogenic system of each key ore (concentration) area is integrated and formed into a demonstration.
WANG Liqiang
Based on the systematic study of deposit alteration, geological characteristics of mineralization, diagenetic and metallogenic age, source of diagenetic and metallogenic minerals, metallogenic background, geophysical survey and hyperspectral survey, a comprehensive exploration model of tiegelongnan, Jiama, Beiya, junuo and Zaxikang cuonadong deposits is established. The data involved in the geochemical model are completed by laboratories recognized in the industry, Geophysical and short wave infrared data are all completed by the entrusted geological team. The work completion degree is high and the data quality is good. The established deposit exploration model can better guide the future prospecting and exploration work, provide a theoretical basis for prospecting and exploration, and has a good application prospect.
WANG Liqiang
Taking Jiama-Qulong ore concentration area as an example, a set of active and passive source electromagnetic / seismological joint survey technologies which is suitable for deep ore prospecting less than 3km deep is constructed. The detection results of active and passive electromagnetic sources have been verified by method of borehole physical properties, log data of Jiama 3km scientific drilling and tunnel IP anomaly. In addition, based on the preliminary verification of zegulang borehole physical properties within Jiama ore concentration area, Mogulang target area and one concealed ore body area are preliminarily proposed in this study. Using passive-source electromagnetic detection and high-frequency ambient noise surface-wave tomography of short-period dense array, it is revealed that there is a high-resistance and high-velocity anomaly body (temporarily defined as unravel porphyr deposite in Muchang area) exceeding the scale of geophysical anomaly of Jiama-Qulong ore concentration area. Combined with the results of other projects, Jiama and Qulong ore concentration areas and rock geophysical models, the unravel porphyr deposite in Muchang area has the characteristics of porphyry mineralization. Several high-conductor bodies are found under 5km deep between Qulong and Jiama and provide ore-forming material sources for the upper rock mass. Therefore, Jiama-Qulong ore concentration area has the potential conditions for a large resource base. Based on the comprehensive analysis of shallow and crustal S-wave velocity structure and receiver function obtained from passive source observation, the three large rock masses (Jiama, Muchang and Qulong) have common deep metallogenic background conditions. Taking N29.5 ° as the boundary, the crustal structure in the south is complex, which have characteristics as northward diping Moho, and obvious doublet Moho. And, the crust structure in the north is clearly simple, as relatively horizontal Moho. Due to strongly northward collision of Indian platin the south, the crustal structure changes obviously. There is an obvious interface below Moho in the northern region. Combined with the existing data, it is comprehensively speculated that the Jiama-Qulong ore concentration area locates in the key position of difference decoupling between the crust and lithospheric mantle and of Indian plat northward subducted beneath Gandese zone.
HE Rizheng
The study of magmatic mixing is of great significance to reveal the interaction between crust and mantle and to explore the process of diagenesis and mineralization. Jiama mining area is located in the eastern section of Gangdise metallogenic belt. It is a super large porphyry skarn type copper polymetallic deposit. Dark inclusions are widely developed in the medium acid magmatic rocks in the mining area. Detailed petrography, rock geochemistry, Sr Nd isotope geochemistry and U-Pb isotope geochronology are carried out for the diorite inclusions in the dark inclusions in order to find out the genesis of the rocks, It provides enlightenment for magmatic mixing and mineralization, and improves the Jiama diagenesis and mineralization model. The analysis and testing of major and trace elements in rocks were completed in Beijing Institute of geology of nuclear industry. Zircon U-Pb isotopic dating was completed in the deposit geochemical microanalysis room of the State Key Laboratory of geological processes and mineral resources of China University of Geosciences (Beijing). The laser denudation system used for isotopic dating is the geolas193 excimer solid injection system made in the United States, ICP-MS is a Thermo Fisher X Series II quadrupole plasma mass spectrometer produced in the United States. Good data quality.
ZHANG Zebin , WANG Liqiang
1) Data content: the data in this report is the EPMA data and calculation results of different types of biotite in Bangpu deposit, which is a systematic summary of the geochemical characteristics of biotite in porphyry metallogenic system. 2) After drilling, the sample is processed, and the source of the sample and the relevant data are calculated by combining the chemical probe and the experience. 3) Data quality review: the samples are collected according to typical samples, and the sample test refers to the laboratory analysis specifications and technical requirements. The data results are finally published in the form of papers and peer review. 4) Data application achievements and prospects: the systematic summary of the mineralogical and geochemical characteristics of biotite in Bangpu mining area preliminarily reveals the exploration indication significance of biotite, which is helpful to finally construct the index mineral exploration evaluation model.
LIN Bin , TANG Pan
1) Data content: the data in this report is the electron probe data and calculation results of different types of pyrrhotite in Jiama mining area. It is a systematic summary of the mineralogical and geochemical characteristics of pyrrhotite in different output states of porphyry metallogenic system. 2) After drilling, the sample is processed, and the source of the sample and the relevant data are calculated by combining the chemical probe and the experience. 3) Data quality review: the samples are collected according to typical samples, and the sample test refers to the laboratory analysis specifications and technical requirements. The data results are finally published in the form of papers and peer review. 4) Data application achievements and prospects: a systematic summary of the mineralogical and geochemical characteristics of pyrrhotite in Jiama mining area, which preliminarily reveals the coupling relationship between pyrrhotite and gold mineralization and the significance of exploration indication, which is conducive to the final construction of the index mineral exploration and evaluation model.
LIN Bin , YANG Yang
1) Data content: the data in this report involves the structural anatomy of Jiama porphyry metallogenic system and the geological logging information of key boreholes, the detailed alteration and mineralization characteristics of each ore body, as well as the technical methods of scientific deep drilling and deep resource exploration. It is the summary and refinement of deep resource exploration technology and methods, and has passed the expert review and acceptance. 2) Data source and processing: among them, the geological information of construction boreholes is mainly from the detailed geological logging in the field. Accurate mineralization information of boreholes comes from basic rock analysis data. CSAMT data comes from the measured data of other topics. It refers to the laboratory analysis and detection of mineral sources. 3) Comment on data quality: among them, the geochemical analysis data of borehole rocks are subject to the quality inspection of internal and external inspection in the laboratory and meet the relevant technical requirements. Other indoor research data (EPMA data) strictly refer to the test requirements and specifications and meet the quality requirements. 4) Data application achievements and prospects: the positioning and prediction method of deep resources in Jiama mining area can effectively predict deep high-grade resources. At the same time, it provides theoretical support for the breakthrough of deep and peripheral prospecting in the mining area and provides a reference basis for regional exploration and evaluation.
LIN Bin
1) Data content: the data in this report mainly includes the thermal infrared and short wave infrared spectrum data of typical boreholes in Jiama mining area. It is the systematic hyperspectral measurement data of the typical section of Jiama porphyry metallogenic system. 2) Data source and processing: the data source is the direct measurement of field front-line instruments. Among them, the short wave infrared spectrum data is measured by fieldspec4 spectrometer produced by American ASD company, and the thermal infrared spectrum is measured by American Agilent 4300 thermal infrared spectrometer. 3) Data quality review: among them, the spectral data measurement is carried out according to the design requirements, and the spectral geologist is adopted ™ (TSG spectral geology expert) analysis software combined with microscopic identification, analysis and processing. 4) Data application achievements and prospects: the hyperspectral data of Jiama mining area is a systematic summary of the spectral data of Jiama thick and large skarn ore body, and a typical spectral exploration model is established, which is helpful to be applied to the exploration and evaluation of similar skarn deposits.
LIN Bin , DAI Jingjing
1) Data content: the geological, structural and alteration information of Jiama mining area is a map drawn based on the typical geological information exposed by the open pit in Jiama mining area. 2) Data source and processing: the geological data source is the field first-line geological mapping. The specific mapping content involves a variety of information, such as structural interpretation, alteration zoning, mineral zoning, fracture occurrence drawing and so on. Finally, it can well reveal the coupling relationship between alteration and mineralization of Jiama porphyry metallogenic system. 3) Data quality review: the data has been reviewed indoor and rearranged. 4) Data application achievements and prospects: Nankeng ore block reveals in detail the control mechanism of multi-stage fold deformation on skarn type alteration and mineralization in the sliding nappe structural system. The Qianshan ore block focuses on revealing the spatial distribution relationship of skarn at the contact boundary of different lithostratigraphic units and the control mechanism of fold deformation and rock mass emplacement.
LIN Bin , TANG Pan
1) Data content: the data in this report is the rock geochemical analysis data of Jiama 3000m scientific deep drilling (main quantity + micro quantity), which is the data disclosure of detailed mineralization information of 3000m scientific deep drilling. 2) Data source and processing: data source: direct sample collection, cutting, crushing and rough grinding of field drilling, and final analysis in the laboratory. 3) Data quality review: the sample collection fully meets the relevant technical requirements. The sample test refers to the national geochemical analysis specifications and technical requirements, passes the internal and external inspection, and the final report passes the expert review and acceptance. 4) Data application achievements and prospects: the geochemical analysis data of Jiama mining area is a systematic summary of Jiama scientific deep drilling data, which is helpful to establish a typical geochemical exploration model.
LIN Bin
1) Data content: this data mainly refers to the 3000m scientific deep drilling construction in Jiama mining area, Tibet, involving various equipment and technical parameter information, including construction design, drilling structure, construction process, quality and safety assurance, etc. This data is the first field first-line data of 3000m scientific deep drilling for solid mineral exploration in the Qinghai Tibet Plateau. It is the first-line data to summarize and improve the construction technology of scientific deep drilling in alpine and anoxic areas, and supports the implementation of other scientific deep drilling in deep exploration projects. 2) Data source and processing method: the data in this report is summarized and condensed under the close cooperation and discussion between the Institute of mineral resources of the Chinese Academy of Geological Sciences, the project leader, and the Third Geological Brigade of Shandong Geological and mineral exploration and Development Bureau, the implementation unit of deep drilling, combined with the actual geological conditions of Jiama mining area and the first-hand data in the actual construction process from 2019 to 2020. 3) Data quality review: the data in this report are all from the field front-line data, and have passed the review and acceptance of the project team and experts. 4) Data application achievements and prospects: the achievements of Jiama scientific deep drilling construction technology are a fine summary of the first 3000m scientific deep drilling construction technology of solid minerals in the Qinghai Tibet Plateau, and also a reference standard for the implementation of deep drilling in other deep projects. At the same time, it also provides solid technical support for subsequent deep resource exploration.
LIN Bin , TANG Juxing
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