This data is the U-Pb ages of zircon and niobium tantalite. Five samples (T-5 is gneissic syenogranite, T-1 is orthogneiss, T-3 and T-5 are biotite monzogranite, and T-9 is Li be mineralized pegmatite) were collected. After crushing, heavy sand minerals were separated by manual elutriation. After magnetic and electromagnetic separation, columbite-tantalite (about 500 grains) and zircon (more than 1000 grains) were picked out under binocular lens. After selecting representative columbite-tantalite and zircon as targets, the internal structure of columbite-tantalite was studied by BSE through microscope transmission light and reflection light photography. Zircon U-Pb chronology was conducted on the 193 nm laser ablation system (new wave) and multi receiver inductively coupled plasma mass spectrometer in Xi'an Geological Survey Center. The U-Pb geochronology test of columbite-tantalite was conducted on the s155 laser ablation system and multi receiver inductively coupled plasma mass spectrometer in Chinese Academy of Geological Sciences. The weighted average age of 15 spots of T-5 zircon is 900 ± 9 Ma; The weighted average age of 20 spots of T-1 zircon is 899 ± 7 Ma; The weighted average ages of zircon 21 and 14 spots of T-3 and T-5 samples are 482 ± 5 and 475 ± 5 Ma, respectively. The weighted average age of 12 spots of T-9 columbite-tantalite is 472 ± 8 ma. The data clarify the metallogenic age of Li-Be in Altun orogenic belt and provide direction for Li-Be prospecting in this area in the next step.
GAO Yongbao, GAO Yongbao, ZHANG Jiangwei ZHANG Jiangwei
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 is the U-Pb age of cassiterite. The samples were collected from cassiterite minerals in skarn type and quartz vein type ores in Songshan tin mine, western Yunnan. The U-Pb geochronology of cassiterite was studied by laser denudation inductively coupled plasma mass spectrometry. The 207Pb / 206Pb - 238U / 206Pb harmonic ages of the two cassiterite samples were 76.6 ± 1.5 Ma and 79.6 ± 3.6 Ma respectively, It shows that the tin mineralization of the Songshan tin deposit mainly occurred in the Late Cretaceous, which is obviously different from the emplacement time of Lincang granite (Triassic). Combined with geological characteristics and previous chronological results, this paper believes that there is an obvious tin mineralization event in the Late Cretaceous in this area. The next prospecting work in this area should focus on the contact zone between rock mass and surrounding rock, as well as the faults in the rock mass and surrounding rock.
This data set includes whole-rock major trace and isotopic geochemical data, monazite, and zircon radioisotope dating data. The samples were collected from the Laguigangri dome of the Himalayan orogenic belt in southern Tibet. The geochemical data of major elements in the whole rock are obtained by X-ray fluorescence spectrometer, the trace elements are obtained by inductively coupled plasma mass spectrometer, and the radioisotope dating of monazite and zircon is obtained by laser denudation inductively coupled plasma mass spectrometer. The data quality is high. These data show that the leucogranitic magma in the Himalayan orogenic belt was formed in multiple stages and came from different homologous areas, which provides a key limit for the magmatic formation mechanism.
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 whole-rock major and trace geochemical data, zircon major elements data, and whole-rock Sr-Nd-Hf isotopic composition data. The samples were collected from the Kangba dome in southern Tibet. The major elements in the whole rock were analyzed by X-ray fluorescence spectrometry (XRF) glass melting sheet method; The trace elements in the whole rock were dissolved by mixed acid dissolution method and tested by Quadrupole Inductively coupled plasma mass spectrometer (Q-ICPMS); The major elements of zircon were analyzed by electron microprobe; For the analysis of Sr-Nd-Hf isotopic composition of the whole rock, the accurate content of three elements is determined by quadrupole ICP-MS, and then the isotopic ratio is determined by MC-ICP-MS. The data obtained show that Kangba leucogranite is crystallized from highly evolved magma that has experienced strong crystallization differentiation. Strong hydrothermal exsolution has occurred in the diagenetic process, and the isotopes of the magmatic system have migrated to varying degrees in the process of hydrothermal fluid. It is also obviously contaminated by the surrounding rock.
This data includes whole-rock major and trace geochemical data, plagioclase major element data, alkali feldspar major element data, muscovite major element data, tourmaline major element data, and monazite trace element data. The samples were collected from the Gaowu rock mass in the Yadong area, southern Tibet. The major elements in the whole rock were analyzed by X-ray fluorescence spectrometry (XRF) glass melting sheet method; The trace elements in the whole rock were dissolved by mixed acid dissolution method and tested by Quadrupole Inductively coupled plasma mass spectrometer (Q-ICPMS); The major mineral elements were analyzed by electron microprobe; The mineral trace elements were obtained by ArF excimer laser ablation system and quadrupole inductively coupled plasma mass spectrometer. The data obtained show that the Gaowu tourmaline muscovite granite shows the characteristics of high evolution magma.
The data are monazite and zircon U-Pb ages. Three samples of carbonatite and pegmatite were collected (2018kl06 is carbonatite, 2018kl101 is tourmaline bearing pegmatite near carbonatite, 2018kl08-2 is beryl bearing pegmatite). After crushing, heavy sand minerals were separated by manual elutriation. After magnetic and electromagnetic separation, monazite (about 500 grains) and zircon (more than 1000 grains) were picked out under binocular lens. After selecting representative monazite as target, the internal structure of monazite was studied by BSE through microscope transmission light and reflection light photography. U-Pb chronology was completed on the 193 nm laser ablation system (new wave) and multi receiver inductively coupled plasma mass spectrometer in the laboratory of Tianjin Institute of Geology and mineral resources. In 2018kl06 carbonatite, the intersection age of the reverse inconsistency line of 17 test points is 18.2 ± 0.3 Ma, while the average age of 9 test points with complete harmony is 18.15 ± 0.22 Ma; The monazite of sample 2018kl101 obtained 15 measuring points with concordance greater than 90%, and the average age is 19.39 ± 0.36 Ma; The average age of 20 zircon sites of sample 2018kl08-2 is 197.5 ± 1.4 ma. They are Cenozoic and Mesozoic (19 ~ 18 Ma and 200 MA), respectively. The early beryl bearing pegmatite was formed in the extension stage after the closure of the paleoTethys ocean, while the Cenozoic bastnaesite carbonatite pegmatite assemblage is related to the Cenozoic intracontinental strike slip extension event, indicating that the extension strike slip of Pamir structural junction may start at 19 ma. Combined with the characteristics of regional geochemical anomalies, it shows that a breakthrough in rare and light rare earth prospecting is expected in Pamir area.
This data is monazite U-Pb age. The samples are collected from the light colored veins closely associated with the lead-zinc ore. after crushing, the heavy sand minerals are separated by manual elutriation. After magnetic separation and electromagnetic separation, monazite (about 500 grains) are picked out under binocular lens. After selecting representative monazite as target, the internal structure of monazite was studied by BSE through microscope transmission light and reflection light photography. U-Pb chronology was completed on 193 nm laser ablation system (new wave) and multi receiver inductively coupled plasma mass spectrometer (MC-ICP-MS, Neptune) in the laboratory of Tianjin Institute of Geology and mineral resources. The average 206Pb / 238U surface age obtained from 21 survey points is 99.25 ± 0.78 MA (mswd = 1.60). This age represents the crystallization age of light vein closely related to lead-zinc mineralization. It is determined that the formation of the deposit is related to the hydrothermal solution in the late evolution of Cretaceous magmatic rocks. According to the comprehensive analysis of regional geochemical exploration and regional geological background, it is considered that the giant lead-zinc ore belt distributed in Tianshuihai Karakoram is controlled by Jurassic Cretaceous volcanic sedimentary basin and Cretaceous magmatic rocks. This metallogenic belt has great prospecting potential.
This data includes the main trace geochemical data of the whole rock. The samples were collected from lalitoushan rock mass at the north end of the Changning-Menglian junction zone in western Yunnan. The main geochemical data of the whole rock are obtained by X-ray fluorescence spectrometer, and the trace elements are obtained by inductively coupled plasma mass spectrometry. Based on the obtained data, it is considered that the initial magma is mainly composed of continental crust and the addition of mantle-derived components. The rock mass belongs to S-type granite, which originates from the partial melting of ancient crustal materials and is mixed with mantle-derived magma. It represents the product under the dynamic background of transformation from compression to extension in the post continental collision stage of Baoshan Simao block and has the material basis for mineralization, It has certain prospecting potential.
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.
Southern Xizang represents a most important part of the Neo-Tethys. Neo-Tethyan deposits in this region can be divided into two types in general: a deep water oceanic represented by the Yarlung Zangbo suture zone and the other shallow marine one in the south of the suture. The main history of the Neo-Tethys is seen in the Triassic to Paleogene sequence, which destines the work of building a complete sedimentary sequence of the Neo-Tethys a basic goal of this scientific expedition. This dataset packages all the fossiliferous profiles that have been explored in the field by the Mesozoic and Cenozoic expedition group of the Nanjing Institute of Geology and Palaeontology of the Chinese Academy of Sciences on the Yarlung Zangbo suture zone and Tethys Himalayan Triassic to Paleogene in southern Xizang. There are 12 column profiles, compiled in an order of age from old to young.
LI Jianguo, LI Xianghui, LUO Hui, WANG Bo, LI Xin
Southern Xizang represnts a most important part of the Neo-Tethys. Neo-Tethyan deposits in this region can be divided into two types in general: a deep water oceanic represented by the Yarlung Zangbo suture zone and the other shallow marine one in the south of the suture. The main history of the Neo-Tethys is seen in the Triassic to Paleogene sequence, which destines the work of building a complete sedimentary sequence of the Neo-Tethys a basic goal of this scientific expedition. This dataset lists all the fossils that have been collected or obtained in laboratory by the Mesozoic and Cenozoic expedition group of the Nanjing Institute of Geology and Palaeontology of the Chinese Academy of Sciences on the Yarlung Zangbo suture zone and Tethys Himalayan Triassic to Paleogene sequences in southern Xizang. The list includes 12 sections, compiled in an order of age from old to young.
LI Jianguo, LUO Hui, WANG Bo, LI Xin
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.