Located in Xilin Gol League of Inner Mongolia Autonomous Region,the Xilinhot-Abaga volcanic cluster is in the centre of the Daxing’anling-Datong volcanic eruption belt.More than 300 Quaternary basaltic volcanoes of d...Located in Xilin Gol League of Inner Mongolia Autonomous Region,the Xilinhot-Abaga volcanic cluster is in the centre of the Daxing’anling-Datong volcanic eruption belt.More than 300 Quaternary basaltic volcanoes of different types are developed in the volcanic eruption belt.Maars are found for the first time in the study area,with those in Haotewula in the southeast of Abagaqi,and Chelewula and Esigewula in the northwest of Abagaqi to be the most representative.They all are large in scale,with cone diameters generally 3~4km,with the largest up to 6.5km.The maars show intact structure,a similar two-ringed mountain landscape and obviously phased eruption which contained a vigorous phreatomagmatic explosion at the earlier stage,and weak magmatic explosion at the later stage,and basaltic lava effusion in the last stage.The eruption sequence reflects the interaction between magma and water,the change of intrusive speed and outflow rate of magma.The Middle Pleistocene deposits of sand and gravel in the valley are covered by basal surge deposits.The TL age of sandstone-shale 'xenolith'which was found in the spatter deposits close to the crater is( 0.112 ± 0.0096) Ma,indicating that the eruption time of the Maars was the early Late Pleistocene.展开更多
Based on the population and economic data of the Wumeng Mountain Area from 2000 to 2020,this study explored the imbalanced spatiotemporal patterns of population and economy in the area using methods such as the geogra...Based on the population and economic data of the Wumeng Mountain Area from 2000 to 2020,this study explored the imbalanced spatiotemporal patterns of population and economy in the area using methods such as the geographic concentration,gravity model,imbalance index,and inconsistency index.The study also analyzed the influencing factors using geodetectors and spatiotemporal geographically weighted regression models.The results show four key aspects of this phenomenon.(1)The spatial distributions of the population and economic geographic concentrations deviate from their ideal distributions.The population distribution shows a spatial pattern of being higher in the northeast and lower in the southwest,while the economic distribution shows a spatial pattern of being higher in the south and lower in the north.(2)The population and economic gravity centers have shifted toward the northeast and south relative to the geometric center of the mountain area,respectively,and the economic center has shifted more than the population center.(3)The degree of imbalance between the population and economic distributions is decreasing,but regional development disparities still exist.The region with inconsistent spatial distributions between population and economy remains stable,showing a"north high,south low"pattern,with an increase in the number of counties dominated by the economy and reductions in the numbers of counties in other categories.(4)Economic power,social consumption level,industrial structure,urban development level,government regulation capacity,and health care infrastructure are the main factors affecting the inconsistent distributions of population and economy in Wumeng Mountain Area,and the effects of these factors are reflected in the promotion of economic development.展开更多
A new family, Grammolingiidae of fossil lacewings is erected, of which 3 new genera and 6 new species are described and illustrated: Grammolingia boi. gen. nov. et sp. nov., Litholingia rhora gen. nov. et sp. nov., Li...A new family, Grammolingiidae of fossil lacewings is erected, of which 3 new genera and 6 new species are described and illustrated: Grammolingia boi. gen. nov. et sp. nov., Litholingia rhora gen. nov. et sp. nov., Litholingia eumorpha gen. nov. et sp. nov. and Litholingia polychotoma gen. nov. et sp. nov., Leptolingia jurassica gen. nov. et sp. nov. and Leptolingia tianyiensis gen. noc. et sp. nov.. A key to genera within this new family is provided. All specimens described were collected from the Middle Jurassic Jiulongshan Formation of Eastern Inner Mongolia, China. The present discovery demonstrates that present knowledge of the Jurassic Neuropetra fauna remains very poor. The fossil specimens are deposited in Yizhou Fossil Museum and Department of Biology, Capital Normal University, respectively.展开更多
基金sponsored by the Special Fund of Public Research,China Earthquake Administration(200782713)Special Fund of the Geological Heritage Protection,Department of Land and Resources,Inner Mongolia Autonomous Region,China(20101030)
文摘Located in Xilin Gol League of Inner Mongolia Autonomous Region,the Xilinhot-Abaga volcanic cluster is in the centre of the Daxing’anling-Datong volcanic eruption belt.More than 300 Quaternary basaltic volcanoes of different types are developed in the volcanic eruption belt.Maars are found for the first time in the study area,with those in Haotewula in the southeast of Abagaqi,and Chelewula and Esigewula in the northwest of Abagaqi to be the most representative.They all are large in scale,with cone diameters generally 3~4km,with the largest up to 6.5km.The maars show intact structure,a similar two-ringed mountain landscape and obviously phased eruption which contained a vigorous phreatomagmatic explosion at the earlier stage,and weak magmatic explosion at the later stage,and basaltic lava effusion in the last stage.The eruption sequence reflects the interaction between magma and water,the change of intrusive speed and outflow rate of magma.The Middle Pleistocene deposits of sand and gravel in the valley are covered by basal surge deposits.The TL age of sandstone-shale 'xenolith'which was found in the spatter deposits close to the crater is( 0.112 ± 0.0096) Ma,indicating that the eruption time of the Maars was the early Late Pleistocene.
基金The National Natural Science Foundation Project(41261039).
文摘Based on the population and economic data of the Wumeng Mountain Area from 2000 to 2020,this study explored the imbalanced spatiotemporal patterns of population and economy in the area using methods such as the geographic concentration,gravity model,imbalance index,and inconsistency index.The study also analyzed the influencing factors using geodetectors and spatiotemporal geographically weighted regression models.The results show four key aspects of this phenomenon.(1)The spatial distributions of the population and economic geographic concentrations deviate from their ideal distributions.The population distribution shows a spatial pattern of being higher in the northeast and lower in the southwest,while the economic distribution shows a spatial pattern of being higher in the south and lower in the north.(2)The population and economic gravity centers have shifted toward the northeast and south relative to the geometric center of the mountain area,respectively,and the economic center has shifted more than the population center.(3)The degree of imbalance between the population and economic distributions is decreasing,but regional development disparities still exist.The region with inconsistent spatial distributions between population and economy remains stable,showing a"north high,south low"pattern,with an increase in the number of counties dominated by the economy and reductions in the numbers of counties in other categories.(4)Economic power,social consumption level,industrial structure,urban development level,government regulation capacity,and health care infrastructure are the main factors affecting the inconsistent distributions of population and economy in Wumeng Mountain Area,and the effects of these factors are reflected in the promotion of economic development.
文摘A new family, Grammolingiidae of fossil lacewings is erected, of which 3 new genera and 6 new species are described and illustrated: Grammolingia boi. gen. nov. et sp. nov., Litholingia rhora gen. nov. et sp. nov., Litholingia eumorpha gen. nov. et sp. nov. and Litholingia polychotoma gen. nov. et sp. nov., Leptolingia jurassica gen. nov. et sp. nov. and Leptolingia tianyiensis gen. noc. et sp. nov.. A key to genera within this new family is provided. All specimens described were collected from the Middle Jurassic Jiulongshan Formation of Eastern Inner Mongolia, China. The present discovery demonstrates that present knowledge of the Jurassic Neuropetra fauna remains very poor. The fossil specimens are deposited in Yizhou Fossil Museum and Department of Biology, Capital Normal University, respectively.
