This data set is the original observation data of magnetotelluric method (MT) collected by the project team in Yangyi geothermal field, Dangxiong County, Tibet. The data format is EDI and contains 36 files. The data set contains 3 MT profiles, with the distance between survey lines of about 1km and the distance between survey points of about 500m. The field data acquisition equipment adopts the new SEP ground electromagnetic detection system developed by the Chinese Academy of Sciences. At each MT measuring point, the two horizontal components ex (north-south direction) and ey (east-west direction) of the electric field are measured with a non polarized electrode, and the three components HX (north-south direction), hy (east-west direction) and Hz (plumb bob direction) of the magnetic field are measured with a magnetic sensor. The observation time of each measuring point exceeds 10 hours, and the effective frequency range is 320 hz~0.001 Hz. Through the preprocessing and inversion of the data set, the electrical structure in the depth of 10km in Yangyi geothermal field can be obtained, which provides a basis for the location and scale of deep heat sources, heat control and heat conduction structures in the investigation area.
CHEN Weiying
This data set is the original observation data of magnetotelluric method (MT) collected by the project team in Yangbajing Geothermal field, Dangxiong County, Tibet. The data format is EDI and contains 53 files. The data set contains 4 MT profiles, with the distance between survey lines of about 1km and the distance between survey points of about 500m. The field data acquisition equipment adopts the new SEP ground electromagnetic detection system developed by the Chinese Academy of Sciences. At each MT measuring point, the two horizontal components ex (north-south direction) and ey (east-west direction) of the electric field are measured with a non polarized electrode, and the three components HX (north-south direction), hy (east-west direction) and Hz (plumb bob direction) of the magnetic field are measured with a magnetic sensor. The observation time of each measuring point exceeds 10 hours, and the effective frequency range is 320 hz~0.001 Hz. Through the preprocessing and inversion of the data set, the electrical structure in the depth of 10km in Yangbajing Geothermal field can be obtained, which provides a basis for the location and scale of deep heat sources, heat control and heat conduction structures in the investigation area.
CHEN Weiying
This data set is the measured magnetotelluric data of zhaxikang ore concentration area in Tibet, with a frequency range of 320 ~ 0.001 Hz. It is used to study the electrical structure of the acquisition area less than 5000 m. The data is obtained from the actual measurement of v5-2000 instrument, and each measuring point forms a file in ". PLT" format, which includes the position of measuring point (longitude and latitude), observation time, measurement parameters and measurement results. The field pole distribution mode of all survey points is a "cross" shape from north to south to East and West. The data collection is carried out in strict accordance with the geological and mineral industry standard of the people's Republic of China Technical Specification for magnetotelluric prospecting (DZ / T 0173-1997), and all parameters (instrument parameters, inspection rate and inspection results) meet the requirements. Using this data set, the shallow electrical structure of Zaxikang mining area more than 5000m is clearly characterized, which provides an important support for mineralization in the study area.
LIANG Shengxian
This data set is the measured data of audio frequency (10400 ~ 1.02 Hz) magnetotelluric in zhaxikang ore concentration area, Tibet. It is used to study the electrical structure less than 1000 m in the acquisition area. The data is obtained from the actual measurement of v5-2000 instrument, and each measuring point forms a file in ". PLT" format, which includes the position of measuring point (longitude and latitude), observation time, measurement parameters and measurement results. The field pole distribution mode of all measuring points is a "cross" shape from north to south to East and West. The data collection is carried out in strict accordance with the geological and mineral industry standard of the people's Republic of China Technical Specification for audio frequency magnetotelluric method of natural field (DZ / T 0305-2017), and all parameters (instrument parameters, inspection rate and inspection results) meet the requirements. Using this data set, the electrical structure of zhaxikang ore concentration area is clearly described, which provides an important support for the study of mineralization and the prediction of prospecting target area.
LIANG Shengxian
The field survey of 15 MT measuring points in Xianshuihe fault zone has been completed in this field observation. After subsequent integration with some old data sets, it is used to study the three-dimensional electrical structure of Daofu Shimian section of Xianshuihe fault zone. For the mtu-5a instrument used in this field observation, the recording time of each measuring point exceeds 40 hours, and each measuring point contains a TBL file, which is used to record the electrode distance, data saturation points and other information of field measurement, as well as three time series files. The file suffixes are Ts3, ts4 and ts5 respectively. Ssmt2000 software is used for data post-processing, which has reliable data quality and can be used to study the three-dimensional electrical structure of Xianshuihe fault zone.
CHEN Xiaobin
Based on the sorting of previous data and the re interpretation of geophysical data, this study identifies the concealed plutonic intrusion with the characteristics of deep rock mass, extracts the ring structure from high-precision remote sensing images, and reconstructs the regional formation model of duolong ore concentration. Since the late Jurassic, under the early arc magmatism in the southern margin of Qiangtang, arc magmatism began to occur in the duolong ore concentration area, forming OIB type basic intrusive rocks, and the deep rock mass was formed in the upper part of the crust. The continuous upward intrusion of magma led to the uplift of tiegeshan area and Jiushan area, accompanied by the formation of surface magma and the uplift of Jiushan area. With the continuous emplacement of magma, the surface brittle rocks break and form a series of ring structures around the deep body and radial structures around the intrusion center. The intersection part forms a stress weak zone, which provides spatial initial conditions for the later shallow spot magmatic position and mineralization. The geophysical and geochemical exploration contents involved in this paper are completed by the geological team, and the geophysical and geochemical data are completed by the geological team. The completion degree of the work is high and the data quality is good. It is submitted to the deep prospecting target area of duolong ore concentration area.
WANG Liqiang , SONG Yang
The data generated by the project are as follows: 1、 Zircon U-Pb age, Hf isotope and trace element data produced by third-party detection; 2、 Sr-Nd-Pb isotopic geochemical data of the whole rock generated by third-party detection; 3、 Whole rock major and trace element data generated through third-party detection; 4、 In situ major and trace element data of chlorite and epidote produced by third-party detection; 5、 Mineral EPMA data generated by third-party detection; 6、 Measured short-wave infrared spectroscopy and X-ray fluorescence element data in the field; 7、 Measured audio magnetotelluric data and broadband magnetotelluric data in the field; The above data were collected in the middle Gangdese metallogenic belt, Tibet. The geophysical data include audio-magnetotelluric (AMT) array covering the major porphyry Cu-deposits and the regional broad-band magnetotelluric (BBMT) array within Zhunuo mining area and surrounding areas, and also the three-dimensional electrical structure models obtained by the inversion of these data. These data were collected from July to October 2019. The magnetotelluric soundings (MT) use the natural electromagnetic fields with rich frequency components as the field source and are able to detect the electrical structure of the earth from near surface to hundreds of kilometers underground. Both the AMT and BBMT data were collected in accordance with the technical specification for natural field audio-magnetotelluric methods (No. DZT 0305-2017). They data acquisition works were conducted through Mtu-5A system developed by the Phoenix Co., Ltd., Canada. The collecting time for BBMT data were more than 24 hours and with period range of 0.004~3000s, while the values of AMT data were more than 1 h and 10000Hz~1s, respectively. The field stations were deployed in geographical coordinates. Standard robust estimation and remote reference processing were used to process the time series and reduce the effects of cultural noises, and finally the impedance tensors and the corresponding apparent resistivity, phase and other information were obtained after editing. Before inversion, the AMT and BBMT impedance data need to be analyzed in detail for dimensionality and strike information. Error floors of 7.5-10 per-cent of the absolute values of both the unrotated diagonal and off-diagonal impedances (i.e., Zxx & Zyy and Zxy & Zyx components) were applied for the 3-D inversion. The short wave infrared spectrum and X-ray fluorescence elemental analysis data are collected from Beimulang and Cimabanshuo deposits in the Zhunuo ore concentration area. The infrared spectrum data were obtained by TerraSpec® Halo of American ASD company that is full spectral range infrared mineral analyzer. The X-ray fluorescence data were obtained by the new generation NITON xl3t 950 portable XRF element analyzer of Thermo Scientific NITON. The collection time is 2018-2021. The chlorite, epidote and rock mass samples for integrated study are all collected from Beimlang, Cimabanshuo, Rmujucuo, Luobugangmu, Yawajiage and other deposits in the middle Gangdese. The trace element data of chlorite and epidote, whole rock major and trace element data and Sr-Nd-Pb isotopic data, zircon U-Pb dating and trace element data, zircon Hf isotopic data and mineral electron microprobe data for comprehensive study were completed in laboratories with relevant qualifications at home and abroad, mainly including the Centre for Ore Deposits and Earth Sciences (CODES), University of Tasmania, Australia, China University of Geosciences (Beijing), Analytical Laboratory of Beijing Research Institute of Uranium Geology, Geological Experiment and testing center, Hubei, Wuhan SampleSolution Analytical Technology Co., Ltd, and Beijing Createch Testing Technology Co., Ltd. All the data have reliable quality. The instruments used include AnalytikJena PQMS Elite ICP-MS instrument with a RESOlution 193 nm laser ablation system, laser ablation multi receiver cup plasma mass spectrometer (LA-MC-ICP-MS), X-ray fluorescence spectrometer, ICP-MS, multi receiver inductively coupled plasma mass spectrometer (MC-ICPMS), ISOPROBE-T thermal ionization mass spectrometer (TIMS) and EPMA-1600. The collection time is 2018-2021. The data set of deep prediction evaluation and prospecting demonstration of porphyry mineralization system in the middle Gangdese provides data support for researchers to study the genetic mechanism and exploration model of the porphyry copper deposit in the Gangdese belt, which show a good application prospect in guiding the prospecting breakthrough in the middle Gangdese.
ZHENG Youye , WU Song , YIN Yaotian
The data set is the original observation data of electrical source transient electromagnetic method collected by the project team in Yangbajing Geothermal field, Dangxiong County, Tibet. The data format is excel and contains 6 files in total. The observation instrument is V8 multifunctional electrical method workstation produced by Phoenix company of Canada, and the field value is vertical induced electromotive force (dBz/dt). The information contained in each excel file includes: measuring point coordinates (geodetic projection coordinates, Beijing 54 Coordinate System), coordinates of transmitter , terrain control points, observation time channel, induced electromotive force and error bar. Through the preprocessing and inversion of the data set, the electrical structure in the depth of 2km in Yangbajing Geothermal field can be obtained, which provides a basis for investigating the location and scale of heat control and heat conduction structures in the investigation area.
CHEN Weiying
The dataset includs borehole core lithology, altitude survey, soil thickness and slop measurement, hydrogeological survey, and hydrogeophysical survey in the Maqu catchment of the Yellow River source region in the Tibetan Plateau. The borehole lithology data is from the 2017 drilled borehole ITC_ Maqu_ 1; altitude survey was carried out using RTK in 2019; Soil thickness and slope data were collected by auger and inclinometer in 2018 and 2019; hydrogeological survey includes groundwater table depth measurements in 2018 and 2019, and aquifer test data obtained in 2019; hydrogeological survey includes Magnetic Resonance Sounding (MRS) , Electrical Resistivity Tomography (ERT) , Transient Electromagnetic (TEM) , and magnetic susceptibility measurements. MRS and ERT surveys were conducted in 2018. TEM and magnetic susceptibility measurements were carried out in 2019.
LI Mengna, ZENG Yijian, Maciek W. LUBCZYNSKI, BOB Su, QIAN Hui
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