The contents include electron microprobe data and microscopic photographs of the chemical compositions of the granitic dioritic mylonites from Yunmengshan area, Beijing. The EPMA data of Mineral chemical composition were obtained by Joel jxa8230 EPMA instrument in the school of resources and environment, Hefei University of technology. The experimental conditions are as follows: accelerating voltage 15kV, testing current 20na, electron beam spot diameter 5 μ m. For smaller particles, 3 μ M beam spot. The data detection time is 10 ~ 20s, and the experimental error is 0 ± 2%。 Natural minerals were used as standard samples. A total of 5 rock samples were tested. For each matrix mineral (plagioclase, potash feldspar, amphibole) in each sample, at least 3 particles are tested, and generally 3-4 probe points are tested for each mineral particle. Electron probe microanalysis (EPMA) was also performed on the representative plagioclase and K-feldspar plagioclase plagioclase plagioclase plagioclase plagioclase plagioclase plagioclase plagioclase plagioclase plagioclase plagioclase plagioclase plagioclas. The chemical composition data of representative minerals are listed in the table. This data can provide data support for the specific temperature conditions and variation rules of ductile deformation of mylonite in Yunmeng Mountain, Beijing.
ZHANG Hui
The results show that the whole rock SR Nd isotopic composition of the basic rocks in the ophiolite of rencuo (Shenzha bange county) in the North Lake area of Tibet. The purpose of this analysis is to clarify the characteristics of magma mantle source area of basic rock unit in ophiolite, and provide key evidence for further constraining the genesis of ophiolite and clarifying its type. The data analysis and testing were completed in Wuhan Shangpu analysis and testing company, and the pre-processing was completed in the 1000 level ultra clean room equipped with 100 level operation platform. The isotope analysis was performed by MC-ICP-MS (Neptune plus) of Thermo Fisher Scientific Company in Germany, and the data acquisition was composed of 8 blocks, each block contained 10 cycles, and each cycle was 4.194 seconds. This set of data samples meet the analysis requirements with high accuracy, which can be used to further constrain the genesis and tectonic classification of Ophiolites in the central Tethys orogenic belt.
ZHAI Qingguo
The table contains 40Ar / 39Ar dating information of mylonite samples from the Korean Peninsula. At first, the samples were separated by crushing → water bleaching → sieving → magnetic separation → specific gravity liquid separation, and then the single mineral dating samples such as biotite, amphibole and Muscovite were selected by hand under binocular lens. The experimental method is 40Ar / 39Ar dating. After pretreatment, the samples were irradiated in the "swimming pool reactor" of the Chinese Academy of atomic energy. The helix MC of the Institute of geology of the Chinese Academy of Geological Sciences was used to heat the samples in stages. The isoplot program was used to calculate the plateau age and the positive and negative isochrons. This data can provide data support for understanding the eastward extension of the Dabie Sulu orogenic belt on the Korean Peninsula.
WU Yudong
This data is the whole rock geochemical composition of Cretaceous magmatic rocks in Lhasa block. Including: basalt, andesite, dacite, granite and other lithology. The age span is from Permian to late Cretaceous. Through these data, we can effectively understand the geochemical properties of magmatic rocks in Lhasa block, and further understand the geochemical composition of magmatic rocks in different periods and the evolution characteristics of corresponding source areas. The data testing was completed in Beijing Kehui Testing Co., Ltd. and the sampling was completed by LA-ICP-MS multi receiver plasma mass spectrometry. The laser ablation system was ESI NWR 193nm, and the ICP-MS was analytikjena plasmaquant MS elite ICP-MS. The off-line processing of analytical data (including the selection of samples and blank signals, calibration of instrument sensitivity drift, calculation of element content, U-Th-Pb isotope ratio and age) was completed by software icpmsdata cal.
ZHAI Qingguo
This data includes zircon U-Pb ages of Precambrian Cenozoic magmatic rocks in Lhasa block, Qinghai Tibet Plateau. The data table includes zircon U-Th-Pb ratios and corrected data results. The U-Pb age concordance diagram is also attached. The data testing was completed in Beijing Kehui Testing Co., Ltd. and the sampling was completed by LA-ICP-MS multi receiver plasma mass spectrometry. The laser ablation system was ESI NWR 193nm, and the ICP-MS was analytikjena plasmaquant MS elite ICP-MS. The off-line processing of analytical data (including the selection of samples and blank signals, calibration of instrument sensitivity drift, calculation of element content, U-Th-Pb isotope ratio and age) was completed by software icpmsdata cal.
ZHAI Qingguo
This data set includes the whole rock major and trace element geochemical data and zircon U-Pb isotope data of the Carboniferous Permian mafic intrusive rocks in Xilinhot area. The major element data of the whole rock are obtained by XRF, the trace element data of the whole rock are obtained by ICP-MS, and the zircon U-Pb isotope data are obtained by la-icp-ms. This set of data has been published in Acta Geologica Sinica (English Edition), a geoscience SCI journal. Through the analysis of this set of data, the characteristics of magma source area and regional tectonic evolution history can be effectively constrained.
WANG Ke, LI Yilong
The data include major and trace geochemical data and zircon U-Pb isotope data of Silurian xuniwusu formation, Devonian Xilinguole complex and Permian Zhesi formation in central Inner Mongolia. The major element geochemical data of the whole rock are obtained by XRF analysis, the trace element geochemical data are obtained by ICP-MS, and the zircon U-Pb isotopic data are obtained by LA-ICP-MS. This set of data has been published in Acta Geologica Sinica (English Edition), which is a geoscience SCI journal. This set of data can effectively constrain the evolution process of regional Paleozoic geological structure.
LI Yilong
Objectives: The Qiangtang Basin is the largest Mesozoic marine basin in the Xizang( Tibetan) Plateau. There have been a lot of debate about the nature and evolution of the Late Triassic Qiangtang Basin. The Zangxiahe Formation that deposited on the northern of the Qiangtang Basin and consist of sandstone and mudstone sediments,which is an significant record for the Late Triassic property of the Qiangtang Basin. The aims of this study are to constrain the nature and tectonic evolution of the Late Triassic Qiangtang Basin based on their provenance and tectonic setting of the Zangxiahe Formation sandstones.Methods: The X-ray fluorescence( XRF) and high-resolution inductively coupled plasma mass( HR-ICP-MS)are used to make the major and trace elements analysis of the Upper Triassic Zangxiahe Formation sandstones in Ganggairi area,the northern Qiangtang Basin. The major and trace elements analysis of samples were measured in the Analytical Laboratory,Beijing Research Institute of Uranium Geology,China.Results: For the Zangxiahe Formation sandstones,Si O2( 66. 9% ～ 76. 2%) and Al2O3( 10. 6% ～ 13. 2%) are the most abundant oxides. The second most abundant oxides are Fe2O3( 2. 70% ～ 4. 87%),Mg O( 0. 81% ～2. 25%),Ca O( 0. 42% ～ 3. 66%),Na2O( 1. 69% ～ 2. 36%) and K2O( 1. 63% ～ 2. 21%),while other oxides including Mn O,Ti O2 and P2O5 contents are lower than 1. 0%. Elements Si and P show slightly enrichment and other oxides show apparent depletion compared to UCC. In comparison with UCC,large-ion lithophile elements,include Sr,Cs and Ba,are depleted significantly. High field strength elements Zr and Hf have similar geochemical properties and enriched significantly. Transition trace elements,Sc,V,Cr,Co,Ni and Zn,also show apparent depletion. The total rare earth element( ∑REE) contents of the Zangxiahe Formation sandstones are 170. 3×10-6～253. 2×10-6( avg. 199. 4×10-6),which are higher than that of the UCC and have significant negative Eu anomaly.Conclusion: The CIA( 55. 0 ～ 65. 9,average 59. 1),CIW( 60. 6 ～ 74. 3,average 65. 9) and PIA( 56. 1 ～70. 6,average 61. 5) values indicate that the intensities of weathering in the source area were weak. No obvious Kmetasomatism occurred in these sandstones based on the A—CN—K diagram and low K2O contents. The relatively high ICV values reflect the source was first-cycle sediments of the active tectonic zone possibly. The Al2O3/Ti O2( 15. 4～21. 6,avg. 18. 5) values of the Zangxiahe Formation are similar to the intermediate igneous rocks,while Ti O2/Zr( 11. 9 ～ 33. 5,avg. 20. 3) values are similar to felsic igneous rocks. The Cr/Th—Sc/Th and Co/Th—La/Sc bivariate diagrams and significant negative Eu anomaly reveal that the Zangxiahe Formation sandstones were potentially derived from felsic igneous rocks,and mixed with minor intermediate igneous rocks. The( Fe2O3 T+Mg O) —Al2O3/Si O2,( Fe2O3 T+ Mg O) —Ti O2,( Fe2O3 T+ Mg O) —Al2O3/( Ca O + Na2O),Si O2—K2O/Na2O and La/Sc—Ti/Zr bivariate diagrams and La—Th—Sc,Th—Co—Zr/10,Th—Sc—Zr/10 triangular diagrams indicate that the source areas of the Zangxiahe Formation sandstones were sourced from the active continental margin and continental island arc,while also mixed with minor passive continental margin,which may be formed in the backarc foreland basin.
WANG Zhongwei
The samples are well qiangke-1, well qiangdi-17 and well qiangzi-16. The analysis and testing work was completed in the laboratory of AR, u-th-he geochronology, Institute of Geology and Geophysics, Chinese Academy of Sciences. See Wu Lin et al. (2016) for testing methods. The results are as follows: the zircon (U-Th) / He ages of 9 samples from three boreholes in the Qiangtang block in the Qinghai Tibet Plateau, except that the thermal history information of two samples from Eocene has not been reset, the rest of the samples are concentrated in Cretaceous, and the age values change little with elevation, indicating the existence of Cretaceous denudation cooling. Well qd-17 in the west of the Qiangtang block recorded denudation cooling in the early Cretaceous (about 127-114 MA), and well qz-16 in the East recorded denudation cooling in the late Cretaceous (about 92-64 MA). The denudation and cooling of the Cretaceous resulted in the statistics of regional low temperature thermochronology and the response of tectonic sedimentary events. The low-temperature thermochronological data of the Qiangtang block, Lhasa block and Himalayan block show that the Cretaceous early Eocene low-temperature thermochronological ages are widely distributed in the Northern Lhasa block and Qiangtang block (within the plateau), while the late Miocene low-temperature thermochronological ages are widely distributed in the southern Lhasa block to Himalayan block (southern margin of the plateau), This age distribution pattern suggests that the interior and southern margin of the plateau experienced different erosion cooling histories. Referring to the rapid denudation cooling process in the southern margin of the plateau since late Miocene, it is speculated that there was a Cretaceous rapid denudation cooling event in the interior of the plateau. Early Cretaceous depositional discontinuities and unconformities occurred widely in the Northern Lhasa block, Qiangtang block and its northern area, which also indicated rapid denudation during Cretaceous. Combined with the analysis of regional tectonic evolution, the Cretaceous denudation cooling may be the result of the collision between the Lhasa block and Qiangtang block after the closure of the Bangong Lake Nujiang ocean in Early Cretaceous, which indicates that there may have been obvious shortening, thickening deformation and corresponding denudation cooling in the crust of the plateau before the Cenozoic India Eurasia collision.
zheng Bo
There are 6 apatite fission track data and 2 zircon fission track data in tiekelike mountain, West Kunlun. The age error is less than 10%; The results show that the tiekelike mountains in the north of West Kunlun have undergone rapid exhumation since Miocene. There are 17 groups of detrital zircon U-Pb dating results of Cenozoic sediments from keriyang section and kashtashi section in front of West Kunlun Mountains, which are analyzed by LA-ICP-MS method, and the age concordance is less than 10%; These results indicate that the early provenance of the Piedmont sediments came from Songpan Ganzi and South Kunlun blocks, and the South Kunlun block and North Kunlun block provided provenance to the Piedmont since the Atushi formation. These results indicate that the Cenozoic uplift of the West Kunlun Mountains experienced a process of gradual northward growth. Four apatite fission track results of bedrock samples from the upper and lower walls of Tashkurgan normal fault in the Pamir orogenic belt were obtained by using the external detector method, and the age error was less than 15%; The results show that the Tashkurgan normal fault began to move about 8.5 Ma, and the footwall of the normal fault tilted westward, which may indicate that there was a structural system transformation from the previous north-south compression orogeny to the late Cenozoic East-West collapse extension in the East Pamir area.
LIN Xiubin
The data set includes garnet, pyroxene, amphibole, muscovite, zoisite and epidote geochemical data of eclogites in the Donghai and Rongcheng area, as well as major data of whole rock. The whole set of data was tested at the VU University Amsterdam, the Netherlands. The single mineral geochemical data were obtained by using jeol8800m electron microprobe analysis, and the main elements of the whole rock were obtained by XRF analysis. The above data have been published in SCI Journal of Earth Science, and the data are authentic. Through the analysis of this set of data, the regional metamorphism process can be effectively constrained, and the subduction denudation history of the terrane can be analyzed.
LI Zhuoyang, LI Yilong
This data set includes major and trace data of whole rock, chemical data of amphibole plagioclase, zircon u-pb-hf isotope data and amphibole Ar isotope data of amphibolite and epidote amphibolite in Xilinhot area, Inner Mongolia. The major element data of the whole rock were obtained by XRF analysis, the trace element data by ICP-MS analysis, the chemical data of hornblende plagioclase minerals by EPMS analysis, the zircon U-Pb isotope data by LA-ICP-MS analysis, the zircon Hf isotope data by mc-la-icp-ms analysis, and the hornblende ar Ar isotope data by gv-5400 mass spectrometer. The above data were obtained in 2017 and published in gsab, a top international geoscience journal. The data are true and reliable. Through this set of data, we can analyze the characteristics of magma source area, understand the regional metamorphism events, and improve the Paleozoic tectonic evolution framework of the Central Asian orogenic belt.
LI Yilong
Electron microprobe data analysis of tourmaline in tourmaline leucogranite of cuonadong dome in North Himalayan dome belt Data source and processing: EPMA testing, testing laboratory: EPMA laboratory, Key Laboratory of orogenic belt and crustal evolution, Ministry of education, Peking University; The element abundance of tourmaline in the probe slice was measured; Data quality: element abundance error < 0.1% Application of the data in the future: analysis of the source areas of leucogranite and their differences, and discussion of the transformation of fluid action.
ZHANG Jinjiang
The data of major and trace elements were analysed by ICP-MS at the State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences. Zircon U-Pb ages and trace elements were analysed by LA-ICP-MS at the Key Laboratory of Mineralogy and Metallogeny of CAS, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences. The international standard samples and reference values measured in the same batch are consistent within the error range, with low blank in the whole process. The samples of YMS and FS batholiths range from diorite to granite (52‒75 wt. % SiO2), and both show the higher bulk rock Fe3+/ΣFe ratios (between 0.3 and 0.6). The Fe3+/ΣFe of low silica (SiO2<65 wt. %) samples of Dabie are consistent with YMS and FS, but the high SiO2 samples show the low ratios (between 0.1 and 0.3) . Compared with MORB, all the samples show the high ƒO2.Majority of zircons Ce4+/Ce3+ and Eu/Eu* ratios are mostly in range of 100-1000, and consistent with ore-bearing porphyries in Chile and China (e.g., Dexing), indicating the high ƒO2. Conversely, the inherited zircon (~2.5 Ga) Ce4+/Ce3+ ratios of Liguo and FS plutons range from 10 to 200, similar to those of ore barren porphyries in Chile, i.e. low ƒO2 .That adakitic rocks with high oxygen fugacity are very widespread in the NCC. Those magmas were derived from partial melting of thickened lower continental crust with the mixing of mantle materials, and the high ƒO2 characteristic inherited from an oxidized mantle source that has been modified by fluids and/or melt derived from (Paleo)-Pacific plate.
ZHANG Zhekun
The data are the typical landscape, geomorphology and sedimentary strata photos obtained by the thematic group in the lower reaches of Yajiang River and Niyang River Basin from July to August 2019, as well as the physical and chemical indexes of loess and river sediments, mainly including: (1) 14C sample sampling and age in the lower reaches of Niyang River; (2) Chronological results of OSL in the lower reaches of Niyang River; (3) XRF of lacustrine sediments and Langou loess in the lower reaches of Niyang River; (4) Magnetic susceptibility of Lamawan lacustrine sediments and Langou loess in the lower reaches of Niyang River; (5) Grain size of Langou loess in the lower reaches of Niyang River; (6) Elements in the lower reaches of Yarlung Zangbo River and Niyang River Basin. The photos mainly show glaciers, rivers, lakes and other landscapes, as well as landslide surface, glacier shear surface and sedimentation.
CAO Bo, GAO Hongshan
The growth process of the Tibetan Plateau has always been the focus of debate at home and abroad, which is of great significance for evaluating different growth models. In recent years, one of the focuses of debate is whether the "original Tibetan Plateau" exists and its scope. Sedimentological evidence and provenance analysis show that the topographic growth occurred in Qiangtang terrane and North Lhasa terrane as early as Cretaceous. However, paleontological and PALEOELEVATION evidences show that the topographical height of the central part of the plateau was formed in the Eocene Miocene. In order to solve this problem, we conducted apatite fission track studies in the Qiangtang terrane in the hinterland of the Qinghai Tibet Plateau. Because crustal thickening usually leads to topographic uplift and relief changes, thus accelerating denudation, the cooling events recorded by fission track are often strong indirect evidence of crustal thickening. The median apatite fission track age of Mesozoic sandstone samples is 40.1 ± 2.6 to 129 ± 3 Ma, with peak ages of ~ 45 Ma and 100-120 ma; The fission track age of the Eocene granite is 38.3 ± 1.3 Ma and 27.4 Ma respectively ± 1.6 Ma。 The uncorrected closed track length is 9.26 ± 39 to 14.11 ± zero point two four μ m. The corresponding relationship between age and age presents a typical "boomerang" trend, which reveals that the regional cooling time is earlier than 100 mA. The results of hefty thermal history inversion reveal that the growth process of the central part of the plateau can be divided into two stages: the first stage, the early Cretaceous (140-100 MA) cooling process reveals the crustal thickening in the central part of the plateau, which may be caused by the horizontal subduction of Bangong Nujiang Tethys ocean. At this time, the prototype of the plateau was formed in the middle and south of Qiangtang terrane; In the second stage, the former Tibet Plateau was gradually formed in the middle of the plateau from Eocene to Oligocene. The spatial distribution characteristics of Cenozoic low temperature thermochronology data in the central plateau show that there is no obvious East-West change, so the lower crustal flow model may be difficult to explain the growth process of the central plateau. On the contrary, the discrete and uniform distribution pattern of low temperature thermochronology data is consistent with the model of continental subduction and lithospheric mantle delamination. Combined with the regional deformation characteristics, the formation mechanism of the former Tibet Plateau includes upper crust shortening, continental crust subduction and deep mantle delamination.
ZHANG Jiawei, LI Yalin, HAN Zhongpeng
The subsidence and exhumation histories of the Qiangtang Basin and their contributions to the early evolution of the Tibetan plateau are vigorously debated. This paper reconstructs the subsidence history of the Mesozoic Qiangtang Basin with eleven selected composite stratigraphic sections and constrains the first stage of cooling using apatite fission track data. Facies analysis, biostratigraphy, paleo-environment interpretation, and paleo-water depth estimation are integrated to create eleven composite sections through the basin. Backstripped subsidence calculations combined with previous work on sediment provenance and timing of deformation, show that the evolution of the Mesozoic Qiangtang Basin can be divided into two stages. From Late Triassic to Early Jurassic times, the North Qiangtang was a retro-foreland basin. In contrast, the South Qiangtang was a collisional foreland basin. During Middle Jurassic to Early Cretaceous times, thrust belt loading from the Jinsha River suture drove development of the combined retro-foreland basin. Detrital apatite fission track ages concentrate in late Early to Late Cretaceous (120.9-84.1 Ma) and Paleogene-Eocene (65.4-40.1 Ma). Thermal history modelling results record Early Cretaceous rapid cooling; the termination of subsidence and onset of exhumation of the Mesozoic Qiangtang Basin suggest that the accumulation of crustal thickening in central Tibet probably initiated during Late Jurassic-Early Jurassic (150-130 Ma), involving underthrusting of both the Lhasa and Songpan-Ganze terranes beneath the Qiangtang terrane, or the collision of Amdo terrane.
ZHANG Jiawei, LI Yalin, HAN Zhongpeng
The collision of Lhasa Qiangtang terrane and its subsequent tectonic evolution are considered to be the most important event in the Tibetan Plateau before the Cenozoic India Asia collision. In view of this scientific problem, through the study of the late Cretaceous granite in Anduo area of Qiangtang terrane, the following achievements and understandings have been obtained. Zircon U-Pb geochronology, major and trace geochemistry and Sr Nd isotopic analysis have been carried out for the chuburi granite. The zircon U-Pb results of the two samples show that they were formed at 73-74 ma. The geochemical data show that the magmatic rocks have high contents of SiO2, K2O, Na2O, Al2O3 and total alkali, belonging to the high-k calc alkaline granite series. The normalized REE map of chondrite and the normalized trace element map of primitive mantle show that the magmatic rocks are characterized by enrichment of LREE and hree, enrichment of large ion lithophile elements and depletion of high field strength elements. Based on the analysis of petrological, petrographic and geochemical data, combined with the regional geological data, it is considered that the chuburi magmatic rock was formed by different degrees of mixed melt of mantle derived magma and lower crust derived melt, and then experienced the obvious separation and crystallization process of potash feldspar, plagioclase and other minerals. The formation of chuburi magmatic rocks is related to the delamination of lithosphere after the collision of Lhasa Qiangtang terrane
HE Haiyang
The late Mesozoic Magmatic arc of the South Qiangtang terrane is related to the long-term subduction of Bangong Lake Nujiang Tethys ocean and the subsequent collision of Lhasa Qiangtang terrane. However, the geological evolution from oceanic lithosphere subduction to continental collision is not clear. In view of this scientific problem, through the study of volcanic rocks in mudijiangya area of South Qiangtang terrane, the following achievements and understandings have been obtained（ 1) Zircon U-Pb dating data of two groups of volcanic rocks in mudijiangya area, Shuanghu County, central Qinghai Tibet Plateau show that the volcanic rocks of qushenla formation were formed at 114 Ma and those of abushan formation were formed at 76-75 ma（ 2) The original magma of the volcanic rocks in the qushenla formation may be derived from partial melting of mantle peridotite contaminated by crustal materials, which is related to the plate rotation of the northward subducted Bangong Nujiang Tethys oceanic crust（ 3) The original magma of volcanic rocks in the abushan formation may be a mixture of crustal melt and asthenospheric mantle, which is related to the lithospheric delamination in the Lhasa Qiangtang collision area.
HE Haiyang, LI Yalin
The Qiangtang terrane preserves an important record of the growth of the Tibetan Plateau since the Mesozoic; however, its deformation and cooling history remain poorly understood. To unravel this issue, we conducted geological mapping in the Esima area and detrital apatite fission-track and (U–Th)/He analyses of the Esima–Rongtang region in the east segment of Central Qiangtang terrane. Our results indicate that the east segment underwent two stages of structural deformation and rapid cooling during 120–110 Ma and 55–38 Ma. By combining our results with those of previous studies of the deformation and cooling history in the west segment, we reconstructed the early spatial and temporal geological evolution of the Central Qiangtang terrane since the Late Jurassic–Early Cretaceous. The structural deformation and cooling of the west segment at 150–130 Ma was related to northward flat subduction of the Bangong–Nujiang oceanic slab. The structural deformation and cooling of the east segment at 120–110 Ma and the west segment at 110–70 Ma was controlled by oblique convergence between Lhasa and Qiangtang. The structural deformation and cooling of the west and east segments at 55–38 Ma was associated with northward intracontinental subduction beneath the Qiangtang terrane induced by the Indo–Asian collision.
BI Wenjun, HAN Zhongpeng, LI Yalin
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