Quantitative reconstruction of Holocene precipitation over Qinghai Tibet Plateau Based on sporopollen data

The surface palynological data in this dataset are from the East Asian palynological database( http://eapd.sysu.edu.cn/database/ And the surface pollen data of the northeastern margin of the Qinghai Tibet Plateau. The precipitation data of surface soil palynological points were obtained from the annual average precipitation data of 126 meteorological stations in the Qinghai Tibet Plateau and its surrounding areas (Xinjiang, Gansu, Sichuan) from 1950 to 1980 (the data came from China Meteorological Science Data Sharing Service Network) http://www.data.ac.cn/xiazai/ )Because topography has a great impact on climate change, Therefore, in ArcGIS, the uneven distribution of annual precipitation data of meteorological stations is transformed into grid data on the surface of the Qinghai Tibet Plateau by Kriging spatial interpolation method, and the precipitation grid data of the surface palynological point can be regarded as the actual precipitation data of the point. By using the method of transformation function, the representative surface palynological types are selected, and the linear regression between them and modern climate is established. The fossil Palynological Assemblages are substituted into the regression equation to obtain paleoclimate parameters. Using the modern analogy method (MAT), assuming that the relationship between vegetation types and climate in the past is corresponding, we can compare the sporopollen spectrum of the strata indicating vegetation types with that of the present representative soil to reveal the similarity between them. Then we can get the corresponding precipitation data of the strata sporopollen by matrix operation with the modern precipitation data of the corresponding points.

0 2021-04-29

A list of Cenozoic plant fossils in the Qinghai Tibet Plateau (2019-2020)

The data include the Cenozoic plant fossils collected from Gansu, Qinghai and Yunnan by the Department of paleontology, School of Geological Sciences and mineral resources, Lanzhou University from 2019 to 2020. All the fossils were collected by the team members in the field and processed in the laboratory by conventional fossil restoration methods and cuticle experiment methods. The fossils are basically well preserved, some of which are horned The study of these plant fossils is helpful to understand the Cenozoic paleoenvironment, paleoclimate, paleogeographic changes and vegetation features of the eastern Qinghai Tibet Plateau.

0 2021-01-13

Pollen data of DHG Section in Qaidam Basin (20201208)

We have completed the pollen analyses of 252 sedimentary samples from Dahonggou section in Qaidam Basin covering the Cenozoic. Palynomorph extraction followed the routine process with HCl and HF treatments during the extraction. Airborne pollen-charcoal traps and surface-sediment samples from soils were collected to evaluate the relationship between pollen-charcoal contents and vegetation structure, and effect of sedimentary environment conditions on the pollen dispersal and deposition. Combined with pollen-charcoal data from other sections, we are going to establish the fire history spanning the last 30 Ma years, and to discuss the responds and feedbacks of the vegetation and fire to the climate changes. Our work is beneficial to the knowledge of the processes of aridification in Inner Asia and its mechanism. The submitted pollen data set is according to the proposal, and in order to guarantee data accuracy, 20% of the data have been examined in our lab by random sampling method. Data collection and analysis are continued, we hope our work can contribute more to the project in the next few years.

0 2020-12-10

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0 2020-07-23

Palaeogeographic distribution of Early, Middle and Late Triassic lithofacies in Pan-Third Pole area

Guided by plate tectonics, palaeogeography, petroleum basin analysis and sedimentary basin dynamics , a large number of data and achievements in recent years of geological and petroleum geology research in Pan-Third Pole have been collected, including basic materials such as strata, sediments, palaeontology, palaeogeography, palaeoenvironments, palaeoclimate, structure, petroleum (sylvine) geology, especially Palaeomagnetism and palaeozoic. On the basis of material, detrital zircon and geochemical data, and combined with the results of typical measured stratigraphic profiles, the lithofacies and climatic palaeogeographic pattern of the Triassic period were restored and reconstructed, and the Palaeogeographic distribution of Early, Middle and Late Triassic lithofacies in Pan-Third Pole area as well as the paleoclimatic distribution maps were obtained, aiming at discussing the control and influence of palaeogeography, palaeostructure and Palaeoclimate on hydrocarbon (potassium-bearing) resources In order to reveal the geological conditions of oil and gas formation and the law of resource distribution, and provide scientific basis and technical support for overseas and domestic oil and gas exploration and deployment in China. The boundary line between different lithofacies and climate is clear, which better reveals the paleogeographic pattern of lithofacies and climate in the Triassic period, which is of certain indicative significance for the study of the control and influence of paleogeography, paleostructure and paleoclimate on oil and gas (including potash) resources, as well as the geological conditions for the formation of oil and gas and the distribution of resources.

0 2020-05-29

Grain size data of Ganzi loess(Last Glacial)

This data is the grain size data set of the XS loess section at Ganzi in the east of Qinghai Tibet Plateau. The whole section is 10 meters thick, and the grain size analysis is carried out according to the interval of 2.5cm. A total of 398 groups of grain size data are obtained. The grain size analysis was carried out at the Key Laboratory of Western China's Environmental Systems(Ministry of Education), Lanzhou University. Before the measurement, the organic matter and carbonate in the sample were removed by H2O2 and hydrochloric acid, then adding the sodium hexago-hydrophosphate and vibrating for about 10 min to disperse samples by using ultrasonic apparatus. All measurements are conducted by using the Mastersizer 2000. This data reflects variations of the loess grain size since the last interglacial, which is of great importance for understanding past evionroment changes in the eastern Tibet Plateau.

0 2020-04-20

Tree age data sampled from different glacier moraines in the central Himalayas

Data set contains tree age of trees growing at different glacier moraines in the central Himalayas. The data were obtained using tree ring samples. Cores samples were collected (almost near to the ground level to estimate the minimum age of the related moraine) using an increment borer. Samples were processed by using standard dendrochronological techniques.

0 2020-03-20

Magnetic susceptibility data the Ganzi loess (last ice age)

This magnetic susceptibility data set of the XS loess section at Ganzi in the eastern Tibet Plateau. We analyzed the magnetic susceptibility of the top part of the loess sequence at 5cm intervals, and obtained 200 sets of magnetic susceptibility data. The experimental analysis was completed in the Key Laboratory of Western China's Environmental Systems(Ministry of Education), Lanzhou University. Air-dried and grind the samples were put it into a non-magnetic cubic box, and measured by the British Bartington MS2. The result indicates the varations of the low frequency magnetic susceptibility of the Loess sequence since the Last Interglacial at Ganzi area, which is of great importance for understanding past environment changes in the eastern Tibet Plateau.

0 2020-03-10

0 2019-12-12

Grain Size Data Set of Luanhaizi Lake (0-859 cm)

Luanhaizi Borehole (LHZ18) was acquired by Huang Xiaozhong Research Group of Lanzhou University in August 2018. This data is 0-859 cm grain size data of the core of Luanhaizi Lake in Qilian Mountains. Grain size analysis was carried out at 0-4 m according to one sample, and grain size analysis was carried out at on ssample interval at the depth of 4-8.6 m, totaling 390 data were obtained. The experiment was completed in the Key Laboratory of the Ministry of Environmental Education of Lanzhou University, and grain size analysis was carried out with Mastersizer 2000 instrument. The data reflected the grain size change of the lake sediment, which is very important for the study of long-time series eolian activities in the Qinghai-Tibet Plateau.

0 2019-10-28