Dongsheng Wang

Wenzhou University

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Zongqi Wang

China Geological Survey

Tao Wang

Chinese Academy of Geological Sciences

Tao Wang

Chinese Academy of Geological Sciences

Yingli Zhang

Chinese Academy of Geological Sciences

Zhen Yan

Chinese Academy of Geological Sciences

Shouxian Ma

Beijing Institute of Geology for Mineral Resources

Shuwen Liu

Peking University

Jianghua Gong

Chinese Academy of Geological Sciences

Xiao Nie

Chinese Academy of Geological Sciences

Zongqi Wang

Shandong University

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Chinese Academy of Geological Sciences

Chinese Academy of Sciences

China University of Geosciences (Beijing)

Ministry of Natural Resources

China University of Geosciences

Peking University

University of Chinese Academy of Sciences

Czech Academy of Sciences, Institute of Geology

Research Center for Eco-Environmental Sciences

China Geological Survey

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Rock Assemblages and Formation Ages of the Baishuijiang Group in the Southwest Qinling Orogenic Belt, Northwest China

Acta Geologica Sinica - English Edition (2020)

Tao Wang Zongqi Wang Dongsheng Wang Wang Ming-qian

Abstract The Baishuijiang Group, located in the southwest Qinling orogenic belt, is divided into three belts according to the characteristic of the matrix and rock blocks based on the large scale geological mapping. The north belt and south belt are composed of abyssal mudstone and siltstone, and limestone, chert and basic and ultrabasic rock blocks. The middle belt consists of a few limestone blocks and turbidites, which were formed in the trench environment. At present, in the Baishuijiang Group, many fossils were found in matrix and rock blocks, the fossils contain the Cambrian small shell fossils (Xiao, 1992; Tao et al., 1992), Silurian chitinozoas, scolecodonts and spores, and Ordovician graptolites, and middle Devonian Coral and conodonts in limestone and chert blocks (Wang et al., 2011a), and Permian radiolarians in the matrix (Wang et al., 2007). The volcanic rock blocks have undergone different degree of metamorphism. Their geochemical characteristics indicate that the rocks are similar to oceanic island arc and seamount (Wang et al., 2009), and SHRIMP U‐Pb dating yielded ages from Neoproterozoic to early Paleozoic (Yan et al., 2007; Wang et al., 2009, 2011b). Therefore, comprehensive analysis of regional data, the Baishuijiang group is an accretionary complex which was consisted of matrix and blocks, and was finally formed during Permian‐Triassic.

Siltstone

Devonian

10.1111/1755-6724.14469

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Application of Environmental Isotopes to Studies of the Origin and Recharge Mechanism of Geothermal Water

Dizhi lunping (2002)

Kun Wang Dongsheng Wang

The study of recharge mechanism includes the source and location of the recharge water, as well as the period, passage and rate of recharge. The application of environmental isotopes to problems of groundwater recharge is based on the spatial and temporal variations of the isotope compositions of water. On the one hand, some isotope compositions remain largely unaffected by physical and chemical processes during their migration from the source to the sampling site, which enables them to serve as markers or tracers. On the other hand, their sensitivity to variations in temperature and the effects of rock-water interaction, steam dispersion, dilution and mixing of water from different origins, and surface evaporation renders them suitable to be geoindicators for these processes. The radioactive isotopes most commonly used in geothermal investigations are tritium and ~(14)C. They may be used to date geothermal waters or detect the contributions from recent precipitation. In the cycling geothermal water,there is a linear correlation between the δD values and the δ~(18)O values similar to that of meteoric water. The δ~(18)O and δD values also change with the latitude and the altitude,in which the δ`(18)O values are higher than those of the local meteoric water, and the latter are lower than those of the local meteoric water. The tritium ratios of the cycling geothermal water are less than 1 as measured in the end of the 1980s. It follows that the cycling geothermal water is the age-old water (pre-bombing water). In fact, the cycling geothermal water stored in the deep aquifer in the North China plain has a ~(14)C age of over 20 ka BP. In that case, the ~2H-poor character of the cycling geothermal water denotes that the palaeometeoric water recharged at the coldwet period of over 20 ka BP. The geothermal water is a hot brine, which may either be a Cl-Ca type hot brine with hydrocarbon deposits, or Cl-Na type hot brine with salt deposits. In the Cl-Na type hot brine, the ~(40)Ar/ ~(36)Ar ratios are part of the continental values, and the δD values are close to those of crystallization water expelled from gypsum by anhydritization. In the Cl-Ca type hot brine with hydrocarbon deposits, the ~(40)Ar/~(36)Ar ratios are close to those of submarine ridges, and the δD values approach those of the plutonic water. It can thus be seen that both the hot brine and the hydrocarbons are derived from the upper mantle.

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Unraveling the early Paleozoic tectonic history of the South Qinling Belt: Evidence from geochronology, geochemistry, and Sm-Nd isotopes of meta-sedimentary rocks

Journal of Geochemical Exploration (2023)

Dongsheng Wang Zongqi Wang Tao Wang Xuanyu Liu

Protolith

Petrogenesis

Geochronology

10.1016/j.gexplo.2023.107362

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Burial and Exhumation History of the Lujing Uranium Ore Field, Zhuguangshan Complex, South China: Evidence from Low-Temperature Thermochronology

Minerals (2021)

Yue Sun Barry P. Kohn Samuel C. Boone Dongsheng Wang Kai‐Xing Wang

The Zhuguangshan complex hosts the main uranium production area in South China. We report (U-Th)/He and fission track thermochronological data from Triassic–Jurassic mineralized and non-mineralized granites and overlying Cambrian and Cretaceous sandstone units from the Lujing uranium ore field (LUOF) to constrain the upper crustal tectono-thermal evolution of the central Zhuguangshan complex. Two Cambrian sandstones yield reproducible zircon (U-Th)/He (ZHe) ages of 133–106 Ma and low effective uranium (eU) content (270–776 ppm). One Upper Cretaceous sandstone and seven Mesozoic granites are characterized by significant variability in ZHe ages (154–83 Ma and 167–36 Ma, respectively), which show a negative relationship with eU content (244–1098 ppm and 402–4615 ppm), suggesting that the observed age dispersion can be attributed to the effect of radiation damage accumulation on 4He diffusion. Correspondence between ZHe ages from sandstones and granites indicates that surrounding sedimentary rocks and igneous intrusions supplied sediment to the Cretaceous–Paleogene Fengzhou Basin lying adjacent to the LUOF. The concordance of apatite fission track (AFT) central ages (61–54 Ma) and unimodal distributions of confined track lengths of five samples from different rock units suggest that both sandstone and granite samples experienced a similar cooling history throughout the entire apatite partial annealing zone (~110–60 °C). Apatite (U-Th-Sm)/He (AHe) ages from six non-mineralized samples range from 67 to 19 Ma, with no apparent correlation to eU content (2–78 ppm). Thermal history modeling of data suggests that the LUOF experienced relatively rapid Early Cretaceous cooling. In most samples, this was followed by the latest Early Cretaceous–Late Cretaceous reheating and subsequent latest Late Cretaceous–Recent cooling to surface temperatures. This history is considered as a response to the transmission of far-field stresses, involving alternating periods of regional compression and extension, related to paleo-Pacific plate subduction and subsequent rollback followed by Late Paleogene–Recent India–Asia collision and associated uplift and eastward extrusion of the Tibetan Plateau. Thermal history models are consistent with the Fengzhou Basin having been significantly more extensive in the Late Cretaceous–Early Paleogene, covering much of the LUOF. Uranium ore bodies which may have formed prior to the Late Cretaceous may have been eroded by as much as ~1.2 to 4.8 km during the latest Late Cretaceous–Recent denudation.

Fission track dating

Thermochronology

10.3390/min11020116

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Zircon U–Pb geochronology and in situ Hf isotopic compositions of the Madao migmatite: Constraints on the Mesozoic orogeny in the South Qinling belt

Geological Journal (2020)

Dongsheng Wang Zongqi Wang Tao Wang Xiao Nie Jianghua Gong

To understand the crustal growth of the Qinling orogenic belt and the Mesozoic continental interaction between the North China and Yangtze blocks, it is critical to study the South Qinling accretionary complex belt, which is an important part of the Qinling orogen. Based on detailed zircon U–Pb geochronology and Hf isotopic compositional analyses of the Madao complex, this study presents constraints on the migmatization and tectonic evolution of the South Qinling orogenic belt during the Mesozoic. Zircons from leucosome samples of migmatites were found to have weak oscillatory zoning, and one sample yielded a weighted mean age that reflects the time at which the regional tectono‐thermal event initiated the anatexis (210–217 ± 2 Ma). The Hf isotopic compositions indicate that the Madao migmatites were derived from the ancient middle–Late Palaeoproterozoic crust. Zircons from mesosome samples of the migmatites that varied in age from the Palaeozoic to Neoproterozoic exhibited core‐rim textures with magmatic cores (256–1,329 Ma), indicating that they were derived from multiple sources with sedimentary protoliths. Of the 55 analysis spots on the overgrowth rims that yielded 206 Pb/ 238 U ages of 200–233 Ma, 40 analyses yielded a weighted age of 211.5 ± 1.0 Ma, indicating the time of anatexis due to the regional tectono‐thermal event. Combined with previously reported Mesozoic data from the South Qinling belt, these results suggest that the migmatites were probably controlled by post‐orogenic extension driven by Mesozoic orogenesis and a prolonged melting episode (from ~200 to 233 Ma). This study reinforces the interpretation that the continental crust in the South Qinling belt may have experienced complex interactions with asthenospheric mantle material during the Mesozoic.

Migmatite

Anatexis

Protolith

Geochronology

Orogeny

Metamorphic core complex

10.1002/gj.4006

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Tracing terrane origin through petrographic and geochronologic proxies: Insights from the Devonian deposits of the Bainaimiao arc terrane in the Central Asian Orogenic Belt

Gondwana Research (2024)

Shouxian Ma Yingli Zhang Dongsheng Wang Zongqi Wang

The Bainaimiao arc terrane (BAT) is a major subduction-accretionary system in the southeastern Central Asian Orogenic Belt, and its tectonic origin is a hotly debated topic. In this paper, we used petrography and zircon U-Pb-Hf isotopes to determine the provenance of the Chaganhebu Formation. We utilized the detrital zircon U-Pb ages of sandstone cobbles from Lower Chaganhebu to trace tectonic origin of the BAT. The presence of a south-directed paleocurrent, arc granitic cobbles during 457–430 Ma, and detrital zircon age populations of 1.6–0.4 Ga, indicate that the Chaganhebu Formation was sourced from the BAT. The cobble lithologies of conglomerates from the Lower Chaganhebu Formation indicate that the source rock assemblage comprises sedimentary rocks, granite, volcanic elements, and vein quartz. The Chaganhebu Formation exhibits a progradational sequence with matrix-supported conglomerates at its base, along with an upward increase in metasedimentary clasts and Precambrian recycled zircons. The above evidence indicates that the BAT experienced considerable uplift and exhumation in a retroarc foreland system. The sandstone cobbles from the Lower Chaganhebu are characterized by Grenville Orogen sources of 1.6–1.0 Ga age populations, and resemble the Upper Bayan Obo Group in the North China Craton. This similarity suggests that the BAT encompasses a Precambrian sedimentary basement in the Damaoqi region. Furthermore, the detrital zircon U-Pb ages of the sandstone cobbles, and the findings of previous studies on the crystalline basement and geomagnetic pole, demonstrate that the BAT represented a fragment that rifted from NW Laurentia during the breakup of the Rodinia supercontinent.

Paleocurrent

Basement

Laurentia

Devonian

Detritus

10.1016/j.gr.2024.01.011

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庐山玉京山岩体成因及其对构造体制转换的约束

Earth Science-Journal of China University of Geosciences (2024)

Jiawei Wang Dongsheng Wang Gang Wang Yudong Wu

10.3799/dqkx.2024.105

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Provenances and tectonic implications of Paleozoic siliciclastic rocks from the Baishuijiang Group of the southern Qinling belt, central China

Journal of Asian Earth Sciences (2017)

Tao Wang Zongqi Wang Zhenhui Ma Dongsheng Wang

Siliciclastic

Detritus

Continental arc

Continental Margin

Lithic fragment

10.1016/j.jseaes.2017.02.039

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Citations (7)

Geochronological and Geochemical evidence of amphibolite from the Hualong Group, northwest China: Implication for the early Paleozoic accretionary tectonics of the Central Qilian belt

Lithos (2016)

Tao Wang Zongqi Wang Zhen Yan Zhenhui Ma Shengfei He

Greenschist

Island arc

10.1016/j.lithos.2016.01.012

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Citations (44)

Decomposition Processes and Characteristics of Wetland Plant Residues: Impacts of Biomass, Sediment, Living V. spinulosa Yan

Water (2025)

Dongsheng Wang Enqi Liu Yunhua Huang Mengyang Zhang Haiming Wu

The decomposition of submerged plants is an important factor affecting water quality and microbial community structure of aquatic ecosystems. This study aims to investigate the effects of the decomposition process of V. spinulosa Yan residues on the water quality and microbial community of the receiving water under different conditions, including biomass weight, sediment component, and living V. spinulosa Yan. The results showed that the optimal biomass for the decomposition of residues was 0.3 g/L. The sand–soil mixture (3:7) showed the lowest decomposition rate (90.4%) due to the poor moisture retention of sand and lack of organic matter and minerals, which slowed down the decomposition process. N and P could be released into the water rapidly through decomposing the residues, and the concentrations of TP, TN, and PO43−-P were positively correlated with the biomass of the residues. The decrease in TN and TP concentrations observed with bioceramic and Fe-C ceramic was partly due to their porous structures promoting microbial attachment and the adsorption of N and P, possibly also through an increase in Firmicutes. After planting living V. spinulosa Yan, TP and PO43−-P concentrations, as well as dissolved oxygen levels, were lower in the sediment groups compared to those in the control group without living V. spinulosa Yan. This suggests that living V. spinulosa Yan effectively purifies water by absorbing nutrients and promoting nitrification–denitrification processes. These differences underscore the active role of living plants in nutrient removal. This study provides a scientific basis for the management of submerged plants.

10.3390/w17020135

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