This data set contains zircon U-Pb dating, zircon Hf isotope, whole-rock principal, and trace element data of diorite granite and andesite dacite in Xinjiang area, south of bango, Qinghai Tibet Plateau. The data results are from the Zhai Qingguo research team, Institute of Geology, Chinese Academy of Geological Sciences. The data are of good quality and can be used to study the ocean closure process of Bangong Lake Nujiang suture in the central Qinghai Tibet Plateau, the subsequent collision process of Lhasa Qiangtang block, magmatism, and the Cretaceous crustal regeneration and reconstruction of Lhasa block in the central and Northern Qinghai Tibet Plateau. At the same time, this data also provides zircon CL images and reflection photos of all samples, zircon location for reference and comparison, and also provides a basis for the chronology of magmatic rocks and zircon genesis in the study area at the same time. Zircon U-Pb age instrument: obtained from laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), zircon Hf isotope instrument: Neptune multi-collector inductively coupled plasma mass spectrometry (MC – ICP – MS), connected by a goals-193 laser ablation system. The main and trace elements of the whole rock are measured by the National Experimental Center (Academy of Geosciences), Major elements: (XRF; Axios – pw4400), trace elements: ICP-MS; PerkinElmer NexION 300D。
This data includes main and micro geochemical data of the whole rock, 40Ar / 39Ar dating data of phlogopite, and Sr-Nd isotope data of the whole rock. The samples were collected from the edge of the Ramba dome in eastern Tibet. The argon isotope of phlogopite uses the stage heating method, and the plateau age and isochron age are calculated by ArArCALC software; The major elements in the whole rock were analyzed by X-ray fluorescence spectrometry (XRF); Trace elements in the whole rock were measured by Quadrupole Inductively coupled plasma mass spectrometer (Q-ICPMS); Sr-Nd isotopic composition was obtained by MC-ICP-MS. The data obtained show that the age of the phlogopite plateau is 13.1 ± 0.18 Ma, which is consistent with the inverse isochron age; The ultrapotassic melt comes from the partial melting of lithospheric mantle in the Indian continent, and the source depth is shallow, so it should be a spinel stable area.
This data includes the main trace geochemistry and Sr-Nd isotope data of the whole rock. The samples were collected from four rock bodies in the West Kunlun Pamir area. The main geochemical data of the whole rock are obtained by X-ray fluorescence spectrometer, the trace elements are obtained by inductively coupled plasma mass spectrometer, and the Sr-Nd isotopic data of the whole rock are obtained by multi-collector inductively coupled plasma mass spectrometer. Through the obtained data, the magma source areas are defined as the mixing of Mesoproterozoic ancient basement rocks and juvenile crustal materials, the mixing of meta-igneous rocks, and meta-sedimentary rocks, and Mesoproterozoic ancient basement rocks, which help understand regional magmatism and tectonic evolution.
Qiangtang Basin is located between the Hoh Xil-Jinsha River tectonic belt and the Bangong-Nu River tectonic belt, is an important petroleum-bearing basin in the Qinghai-Tibet region of China. The basin has multiple sets of source rocks developed in the Mesozoic. The Triassic strata are widely distributed in the basin. Among them, the Upper Triassic has a large thickness and is considered as an important source rock, however, there is still a lack of understanding of its distribution, hydrocarbon generation potential, and major controlling factors. In this paper, the Upper Triassic source rocks in the Qiangtang Basin were studied, and the key samples were taken in the Quemo Co area of the Northern Qiangtang Basin, which was less studied previously. The source rocks were evaluated based on the geochemical characteristics of the samples, and the provenance input and depositional environment of the source rocks were analyzed according to the characteristics of their biomarkers. Combining the results of previous studies on the source rocks of the Upper Triassic Xiaochaka Formation in the Qiangtang Basin, the distribution characteristics, hydrocarbon generation potential, and the controlling factors of the source rocks of the Upper Triassic in the Qiangtang Basin were studied. The analysis results of the samples of the Upper Triassic Bolila Formation and the Bagong Formation source rocks collected in the Quemo Co area of the Northern Qiangtang Basin indicate that the TOC range of the Bolila Formation limestone is 0.03%~0.53% with an average of 0.20%, and the TOC range of the Bagong Formation mudstone is 0.57%~1.78% with an average of 1.04%. Both have reached the effective source rock grade, The source rocks of the Bolila formation reaches the level of medium source rock grade, and the organic matter abundance of the source rocks of the Bagong Formation is higher than that of the Bolila Formation and reach the medium-good source rock grade. The organic matter types of the source rocks are type II 1 , and the Tmax of the organic matter are all higher than 455°C, R O of all samples are 1.3% to 2.0%, the organic matter maturity achieve high mature stage. The organic matter of the source rocks is both the marine aquatic organism and the terrestrial plant, which is a mixed source. The source rocks sedimentary environment should be a reducing environment. The salinity of water body may be the salt water environment. Combining with previous research results, the authors evaluated the source rocks of the Upper Triassic Xiaochaka Formation in the Qiangtang Basin. The organic matter abundance of the argillaceous source rocks can basically reach the medium-good source rock level, carbonate source rocks organic matter abundance basically reach the poor source rock level. The types of the organic matter in carbonate source rocks are mainly Type II 1 and individually Type I. The organic matter types of the argillaceous source rocks are Type II 2 and Type III, and a small amount of the Type II 1 source rocks. The maturity of the source rocks is generally high-mature and over-mature stage, with only a few areas showing mature stage. The argillaceous source rocks are distributed in the Tumen-Sewa area, Zaxiahe-Ganggairi and Woruo Moutain-Geladandong area in the North and South Qiangtang Depression. Carbonate source rocks are mainly distributed in the South Qiangtang Depression. Affected by the regional tectonic movements, the main source rock beds in the Qiangtang Basin have undergone two oil and gas generation processes during the burial process. The Upper Triassic Xiaochaka Formation entered the hydrocarbon generation threshold in in the late Lower Jurassic to early Middle Jurassic and entered the first oil generation period. The basin experienced the last period of intense deformation and shrinkage in the Late Oligocene-Early Miocene and entered the second hydrocarbon generation period.
Apatite (U-Th)/He data from the Nuomuhong region of the East Kunlun Shan. Apatite (U-Th)/He analysis was conducted at the State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration using the Australian Scientific Instruments (ASI) Alphachron noble gas mass spectrometer and Agilent 7900 inductively coupled plasma mass spectrometry. Reproducibility within each sample were reasonably good. We determine the paleodepth of each sample by measuring the distance perpendicularly from the erosion surface to the sample. All new and published ages are plotted against their paleodepth. The age-paleodepth relationship shows a break in slope at ~25 Ma, which is interpreted to initiation of thrusting at northern margin of the East Kunlun Shan.
LI Chaopeng, ZHENG Dewen
This data set includes cathodoluminescence images (CL images) of detrital zircons from sandstone of Late Carboniferous-Late Permian strata in the Southern Qiangtang terrane and Early Cretaceous Hauterivian-Albian strata in the Bangong‐Nujiang suture zone, Tibetan Plateau. The sampling and shooting time is 2018-2019. The sampling areas of Late Carboniferous-Late Permian strata are Jiaco and Ritu areas of the Southern Qiangtang terrane. The sampling areas of Early Cretaceous Hauterivian-Albian strata are Baerqiao, Mabujiaco, Duochang and Kama areas of the Bangong‐Nujiang suture zone. CL images were taken in the Continental Dynamics Laboratory, Chinese Academy of Geological Sciences, Beijing, China These data provide a key limit for understanding the closing of the Bangong‐Nujiang suture zone. The opening time of Bangong‐Nujiang Ocean is limited to 300-279Ma, and the closing time is limited to 110-100 Ma, which is of great significance to explore the tectonic evolution of Tethys Ocean. The related articles of the data set have been published in the well-known journals《Palaeogeography, Palaeoclimatology, Palaeoecology》,《Tectonics》,《Geoscience Frontiers》, and the data results are true and reliable.
13C and 18O isotopic test results of late Pleistocene lacustrine mudstone deposits in Dunhuang basin and some horizons in Jiuxi basin since Miocene. The testing unit is the Key Laboratory of mineralization and resource evaluation, Institute of mineral resources, Chinese Academy of Geological Sciences, and the instrument used is mat 253 gas isotope mass spectrometer. The data quality is good and within the error range. The 13C and 18O isotopic data of Dunhuang basin indicate that the lacustrine sediments in Dunhuang basin were in the late Pleistocene, and the overall climate was arid. The 13C and 18O isotopic data of Jiuxi basin indicate that although there are slight differences in different regions of Jiuquan Basin since Miocene, the climatic conditions are basically the same. It has been under relatively dry climatic conditions for a long time, while the Holocene profile shows an obvious change trend due to a short time range, which may indicate that the climate has fluctuated greatly since Holocene.
This data set is the zircon cathodoluminescence image data (CL image) and chronology data set of rencuo ophiolite in the central Qinghai Xizang Plateau. The lithology of the sample includes gabbro, diabase and plagioclase granite. The formation age is about 160-150ma, and the sampling and shooting time is 2019-2020. The separation of zircon was completed in Hebei Regional Geological Survey Institute. Conventional heavy liquid and magnetic separation methods were used for separation, and finally pure zircon was selected under binocular microscope. The sample target was prepared in the Institute of geology, Chinese Academy of Geological Sciences. The diameter of the sample target was 25 mm. The cathode fluorescence image analysis of zircon was completed on the cathode fluorescence analysis system of Institute of geology, Chinese Academy of Geological Sciences (Hitach s-3000n field emission environmental scanning electron microscope and chroma cathode fluorescence spectrometer of Gatan company). Zircon U-Pb dating data were obtained by shrimp II ion probe of Beijing ion probe center, and the data accuracy was ~ 0.5-1ma. These data provide a key limit for understanding the formation and evolution of the Tethys ocean in the Qinghai Tibet Plateau, and have comparative significance for the study of oceanic zircons. The data association results have been published in the Geological Society of America Bulletin. The data results have been peer reviewed and the data quality is true and reliable.
Data content: A large number of strongly deformed quartz veins are developed in the Ramba Dome, which records the fluid activity information in the extensional structure. Raman analysis of inclusions in quartz veins in the footwall and hangingwall of the STDS show that the main liquid phase component of inclusions is H2O and the gas phase components are CO2 and CH4. The existence of CO2 and CH4 represents the contribution of deep source fluids. The main source of CO2 is related to regional and contact metamorphism in the Ramba Dome. This data set has been published in the geological journal. Data source and processing method: The experimental work is mainly studied by WiTEC GmbH micro confocal Raman spectroscopy imaging system (alpha300R). The Raman experimental data analysis is completed in the laboratory of WiTEC Beijing demonstration center, using 532 nm laser as excitation light source, and the Raman spectral data is processed by WiTEC Project Five software. Data quality: The scanning area is 8 µm × 7 µ m, including 504 pixels, the integration time of each pixel is 1s, the spatial resolution is 350 nm, the data quality is high and the reliability is strong. Data application achievements and prospects: Through the analysis of mineral facies of inclusions, we observed the spatial distribution, correlation and chemical differences of different components of gas-liquid phase in quartz vein inclusions in Ramba Dome. The experimental method is based on the fast Raman imaging technology with high sensitivity and high resolution, which solves many difficult tests pain points in the geological field. At the same time, WiTEC Raman system provides excellent expansion performance for many scientific research workstations with its open structure, which greatly reduces the difficulty of realizing various in-situ experiments such as high and low temperature, high pressure, and reaction process.
LI Xiaorong, ZHANG Bo
This data set contains zircon U-Pb dating, zircon Hf isotope, whole rock principal and trace elements, and whole rock SR Nd isotope data of Cambrian and cryogenian granites in Anduo area, Qinghai Tibet Plateau, from Zhai Qingguo team of Institute of geology, Chinese Academy of Geological Sciences. The data are of good quality and can be used for the study of the early formation and evolution of the Qinghai Tibet Plateau and the paleogeographic reconstruction of the Precambrian supercontinent. The main analytical instruments used include: Zircon U-Pb age is obtained by laser ablation – inductively coupled plasma – mass spectrometry (LA-ICP-MS), and zircon Hf isotope is obtained by a NWR 213nm laser ablation microprobe attached to a multicollector ICP – MS (Neptune plus), The major and trace elements in the whole rock were obtained by X-ray fluorescence Shimadzu (xrf-1800) and analyticjena pqms elite ICP – Ms.
This data set contains zircon U-Pb dating, zircon Hf isotope, whole rock major and trace elements, and whole rock SR Nd isotope data of Cambrian magmatic rocks in the central Qinghai Tibet Plateau, from Zhai Qingguo research team, Institute of geology, Chinese Academy of Geological Sciences. The data quality is excellent, which can be used for the study of the early formation and evolution of the Qinghai Tibet Plateau and the paleogeographic reconstruction of the Precambrian supercontinent, as well as the reconstruction of global ancient plates and paleogeographic restoration. This provides key information for understanding the early evolution of the Qinghai Tibet Plateau. Zircon U-Pb dating data were obtained by shrimp II ion probe, and zircon HF isotopes were obtained by Neptune multicollector (MC) ICP-MS equipped with a geolas 200 m ARF exciter 193 nm laser ablation system.
Data content: This data set is the quantitative comprehensive mineral facies analysis data of tectonite from RAMBA gneiss dome obtained by the Tescan Integrated Mineral Analyzer. The data includes the type, content, structural characteristics, distribution characteristics of the whole mineral facies in the tectonite, as well as the type, abundance and main hosted mineral facies information of the full spectrum elements. Data source and processing method: The data were obtained by four high spatial and temporal resolution EDAX energy spectrometers mounted on a Tescan field emission scanning electron microscope. The electrons outside the atomic nucleus of a measuring point on the mineral surface are bombarded by a high-energy electron beam, the transition between different energy levels or excited to escape into free electrons and release photons with a certain energy. The type and content of the mineral element can be accurately calibrated by the signals captured by different energy channels of the energy spectrum detector. Then, automatic comparison and matching are carried out in the database with nearly 5000 mineral phases, so as to fulfill the accurate determination of mineral phases and the element abundance mapping. The voltage is 25 kV, the working distance is 15mm, and the spot size is 100nm. Data quality description: Due to four energy spectrum detectors being equipped, the data acquisition time is short, the accuracy is high, the requirements for sample morphology are low, the detection limit is low, the data quality is very high and strongly reliable. Data application achievements and prospects: Sample size is 27mm x 47mm standard optical thin section, scanning area is full slice scanning with High-resolution scanning mode, and the step size is set to 1μm. Through data analysis, we have obtained the mineral assemblage characteristics of each structural unit of the Ramba gneiss dome, completed the metamorphic grade and metamorphic facies zoning, and put forward the structural thermal evolution model of the Ramba gneiss dome. This technic has been widely recognized and used in structural geology, petrology, geochronology, ore selecting, metallurgy, metal processing and manufacturing, and other disciplines and industries.
This data includes zircon U-Pb dating of metamorphic rocks and basalts in the Precambrian continental crust remnant in the northwest of the North Qilian orogenic belt measured from 2019 to 2021, major and trace and Sr nd Hf isotopic geochemical test results of the whole rock, and major and trace geochemical test results of minerals. The main instruments used are Aglient 7500a ICP-MS, X-ray fluorescence (XRF), inductively coupled plasma mass spectrometry (ICP-MS), thermo Finnigan Triton thermal ionization mass spectrometer (TIMS), Neptune MC ICPMS and electron microprobe (EMPA). The data quality is high and within the error range. According to the data, the Precambrian continental crust fragments can be divided into three stages: Paleoproterozoic (1.7 GA), early Mesoproterozoic (1.6 GA) and middle Mesoproterozoic (1.5-1.2 GA), which were formed in the continental margin arc, intracontinental rift and initial ocean basin environment respectively. It is revealed that the Qilian block is located in the southwest of the core of the ancient lombia supercontinent.
This data is the detrital zircon data of the upper Shihezi Formation of the middle and Late Permian on the southwest margin of the North China plate, which is the experimental data. More than 5kg sandstone samples were collected in the field. Zircon was separated from the samples and made targets by heavy liquid and magnetic separation technology. Single grain zircon LA-ICP-MS microanalysis was carried out in the State Key Laboratory of continental dynamics of Northwestern University. The sample collection, pretreatment and experimental process are carried out according to strict standards, and the data quality is reliable. The results show that the zircon ages range from 254 to 2700 Ma, and the main peak ages are ~ 320 Ma, ~ 1765 Ma and ~ 2495 Ma, respectively. Combined with the regional geological background and sedimentological data, it is considered that the peak age of ~ 320mA can come from the northern margin of the North China plate; This also suggests that the paleotopography of the upper Shihezi Formation was high in the north and low in the south. The provenance information reflected by the middle Late Permian detrital zircon data on the southwest margin of the North China plate can provide data support for reconstructing the paleogeography of the North China plate at that time.
Based on 12.5m DEM and remote sensing image interpretation, we can clearly identify the scarps, staggered rivers, gate ridges, compression ridges and other structural landforms along the Honghe fault, Nanting River fault and Lancang Gengma fault, which provides basic data for further field verification. Through the analysis of the landform along the fault and the fine structural analysis of the Quaternary fault outcrop, the kinematic characteristics of the fault are determined. The deflections of the drainage system and the geological and geomorphic units of the fault indicate that the amount of dextral dislocation of the HONGHE FAULT ranges from tens of meters to 50 km. A series of structural landforms such as sinistral dislocations of large gullies, fault troughs, fault triangles and scarps developed along the Nanting River fault. The Lancang Gengma fault is dominated by dextral strike slip.
The development history of high topography in the northeastern (NE) Tibetan Plateau is essential to test various plateau growth models and understand plateau construction. We present integrated provenance data from the NE Qaidam Basin, south of the Qilian Shan. Results show an increase in carbonate lithics, an increase in Al2O3/SiO2 ratios, a negative shift in εNd values and an appearance of large amounts of Precambrian zircon grains in the period of ~13 to ~8 Ma, arguing that the sediment source of the NE Qaidam Basin may have shifted from the East Kunlun Shan to the Qilian Shan during this time interval. We infer that significant topographic growth of the southern Qilian Shan occurred during the middle-late Miocene. Along with widespread middle to late Miocene deformation records across the Qilian Shan and abruptly shifts on provenance, sedimentary facies and climate indexes in its surrounding basins, present high topography of the NE Tibetan Plateau may have been established since the middle-late Miocene.
LI Chaopeng, ZHENG Dewen
The data coverage area is Sichuan Tibet traffic corridor, which is vector line data. The data defines its active period and names it. The strike, nature, active period and exposure of the fault are described. However, the content is missing, and the secondary fault zone is not named. There are 590 linear elements within the Sichuan Tibet traffic corridor in this data set, but some linear elements are multiple elements of the same fault zone. The active fault zone is often the combination zone of different plates and different blocks. It is a relatively weak zone of the crust, which is easy to induce extremely serious earthquake disasters. It is also a concentrated development zone of geological disasters such as collapse, landslide and debris flow. The judgment of the location and nature of fault zone is of great significance to the risk susceptibility evaluation of geological disasters, and it is the key factor to study geological disasters.
This set of data is used to reconstruct the magnetostratigraphy of the Hoh Xil basin in the interior of the Qinghai-Tibet Plateau and the Sichuan Basinaround the eastern margin of the plateau, and then combined with other chronological methods to establish high-precision chronological scales of the two basins. All the data are thermal demagnetization data, including two parts: one is the paleomagnetic data of the strata about 1000 meters in the top of the Hoh Xil basin; The second is the paleomagnetic data of the bottom strata in Sichuan Basin. The data were measured or obtained in the State Key Laboratory of continental dynamics, Northwestern University and the laboratory of paleomagnetism and geochronology, Institute of Geology and Geophysics, Chinese Academy of Sciences. The preliminary processing results show that the data quality is high.
This data belongs to zircon U-Pb geochronology data of Jurassic strata in Yanshan tectonic belt, including Pb, 232Th, 238U contents, 207Pb / 206Pb, 2upb geochronology data of early Mesozoic strata in Yanshan technological belt (230-225ma). Docx07pb / 235U, 206Pb / 238U ratio and error, 207Pb / 235U, 206Pb / 238U age and error data, etc. Zircon U-Pb dating was performed in the ion probe Laboratory of Institute of Geology and Geophysics, Chinese Academy of Sciences using cameca ims-1280hr. The U-Th-Pb isotopic ratios were determined by standard zircon pl é Sovice correction was achieved. The U content was obtained by standard zircon 91500 correction. Simultaneous interpreting of the standard deviation and the internal accuracy of the single point test was achieved by the standard sample of long term monitoring, and the single point error was obtained. The accuracy of the standard sample Qinghu was used as the unknown sample monitoring data. The measured 204Pb value is used for ordinary Pb correction. The error of isotope ratio and age is 1 σ。 The harmonious age and average age were calculated by using the isoplot software. The results of geochronology are published in Tectonophysics, and the data quality is reliable. It plays a key role in determining the Middle Jurassic stratigraphic age and tectonic deformation age of Yanshan structural belt, and has a good application prospect.
This data belongs to zircon U-Pb geochronology data of early Mesozoic strata in Yanshan tectonic belt, including Pb, 232Th, 238U contents, 207Pb / 206Pb, 207Pb / 235U, 206Pb / 238U ratios and errors, 207Pb / 235U, 206Pb / 238U ages and errors, etc. Zircon U-Pb dating was performed in the ion probe Laboratory of Institute of Geology and Geophysics, Chinese Academy of Sciences using cameca ims-1280hr. The U-Th-Pb isotopic ratios were determined by standard zircon pl é Sovice correction was achieved. The U content was obtained by standard zircon 91500 correction. Simultaneous interpreting of the standard deviation and the internal accuracy of the single point test was achieved by the standard sample of long term monitoring, and the single point error was obtained. The accuracy of the standard sample Qinghu was used as the unknown sample monitoring data. The measured 204Pb value is used for ordinary Pb correction. The error of isotope ratio and age is 1 σ。 The harmonious age and average age were calculated by using the isoplot software. The results of geochronology data are published in Earth Science Reviews. The data quality is reliable. It plays an important role in establishing the early Cenozoic geochronology framework and regional stratigraphic correlation of Yanshan structural belt, and lays a foundation for further analysis of Mesozoic basin evolution history, which has a good application prospect.