Sequence of the Cenozoic Mammalian Faunas of the Linxia Basin in Gansu, China

In the Linxia Basin on the northeast margin of the Tibetan Plateau, the Cenozoic strata are very thick and well exposed. Abundant mammalian fossils are discovered in the deposits from the Late Oligocene to the Early Pleistocene. The Dzungariotherium fauna comes from the sandstones of the Jiaozigou Formation, including many representative Late Oligocene taxa. The Platybelodon fauna comes from the sandstones of the Dongxiang Formation and the conglomerates of the Laogou Formation, and its fossils are typical Middle Miocene forms, such as Hemicyon, Amphicyon, Platybelodon, Choerolophodon, Anchitherium, and Hispanotherium. The Hipparion fauna comes from the red clay of the Liushu and Hewangjia Formations, and its fossils can be distinctly divided into four levels, including three Late Miocene levels and one Early Pliocene level. In the Linxia Basin, the Hipparion fauna has the richest mammalian fossils. The Equus fauna comes from the Wucheng Loess, and it is slightly older than that of the classical Early Pleistocene Nihewan Fauna. The mammalian faunas from the Linxia Basin provide the reliable evidence to divide the Cenozoic strata of this basin and correlate them with European mammalian sequence.

Analysis of the Ore-Controlling Structure of Ductile Shear Zone Type Gold Deposit in Southern Beishan Area, Gansu, Northwest China

The ductile shear zone-type gold deposit is a kind that both the ore-forming mechanism and ore-controlling factors are closely related to the ductile shear zone and its evolution. Ductile shear zone develops in Beishan area, Gansu of Northwest China, and develops especially well in the south belt. The controls of the ductile shear zone on gold deposits are as follows. （1） The regional distribution of gold deposits （and gold spots） is controlled by the ductile shear zone. （2） The ductile-brittle shear zone is formed in the evolution process of ductile shear zone and both are only ore-bearing structures and control the shape, attitude, scale, and distribution of mineralization zones and ore-bodies. （3） Compresso-shear ductile deformation results in that the main kind of gold mineralization is altered mylonite type and the main alteralization is metasomatic. （4） Ore-bearing fracture systems are mainly P-type ones, some D-type and R-type ones, but only individual R＇-type and T-type ones. （5） Dynamic differen- tiation and dynamic metamorphic hydrothermal solution resulting from ductile deformation is one of the sources of ore-forming fluid of gold mineralization, and this is identical with that ore-forming materials are mainly from metamorphic rocks, and ore-forming fluid is mainly composed of metamorphic water, and with the fluid inclusion and geo-chemical characteristics of the deposit. （6） There is a negative correlation between the gold abundance and susceptibility anlsotropy （P） of the altered mylonlte samples from the deposit, which shows that the gold mineralization is slightly later than the structural deformation. All above further expound the ore-forming model of the ductile shear zone type of gold deposits.

Hand in Hand East and West to Build a Glorious Gansu——Talk on the cooperation between the East and West of China by Mr.Cui Zhenghua,vice governor of Gansu Province

To implement the CPC CentralCommittee’s strategy of slanting theeconomic construction to the Midand West of China and to further promote thedevelopment and cooperation of economyand trade between the East and West, theEast-West Business and Trade Talks wereheld by the China Council for the Promotionof International Trade (CCPIT). At theconference, Mr. Cui Zhenghua, vice governorof Gansu Province and concurrently chairmanof the Gansu Subcouncil of the CCPIT,delivered a speech on the economiccooperation and development between theEast and West of China.

Cuticles and Spores in Situ of Coniopteris hymenophylloides from the Middle Jurassic in Gansu, Northwestern China

Coniopteris was a ubiquitous plant of the Jurassic and Cretaceous periods and played an important role in the flora of the time. However, its anatomical structure is relatively poorly known. The specimens of Coniopteris hymenophylloides(Brongniart) Seward described here were collected from the Yaojie Formation in Gansu Province, northwestern China. The sterile fronds are characterized as being at least bipinnate with alternate arranged linear pinnae covered by thin cuticles. Fertile fronds are linear-lanceolate, with single sorus at the margin of each fertile pinnule. In situ spores are typically trilete, triangle to subcircular in polar view, cap-shaped in equatorial view, and 37 μm in average diameter. The trilete marking is straight and narrow, generally extends to 4/5 of the spore radius. The spore surface is smooth, and parts of the exine are granulated. The epidermal cells of cuticles are irregular in shape, approximately 40-60μm long and 10-20 μm wide. The elliptical stomatal complexes are paracytic,approximately 30 μm long and 19 μm wide,and irregularly distributed. On the basis of its epidermal structures and comparisons with extant ferns, we consider that Coniopteris displays combined features of the related extant genera.

Many New Dinosaur Fossil Spots Discovered in the Dunhuang-Yumenguan-Jiuquan Area of Gansu Province, China

Two Mesozoic intramontane basins are developed in the Dunhuang-Yumenguan-Jiuquan area of Gansu Province,China,i.e.,the Gongpoquan Basin（E97°30′-98°10′,N41°30′-41°45′）and the Yujingzi Basin（E98°15′-99°00′,N40°15＇-40°40＇）（Fig.1）.A large number of dinosaurs and other fossils have been discovered in these two basins,which are called dinosaur＇tribes＇by paleontologists.

Thermal Structure and Rheology of the Upper Mantle Derived from Mantle Xenoliths from Gansu Province, Western China

Mantle xenoliths brought up by Cenozoic volcanic rocks onto the earth’s surface may provide direct information about the upper mantle beneath the volcanic region. This paper presents the study on mantle xenoliths collected from Haoti village, Dangchang County, Gansu Province, western China. The main purpose of the study is to gain an insight into the thermal structure and rheology of the upper mantle beneath the region. The results show that the upper mantle of the region is composed mainly of spinel lherzolite at shallower depth (52～75km), and garnet lherzolite at greater depth (greater than 75km), instead of harzburgite and dunite as proposed by some previous studies. The upper mantle geotherm derived from the equilibrium temperatures and pressures of xenoliths from the region is lower than that of North China, and is somewhat closer to the Oceanic geotherm. The crust-mantle boundary is determined from the geotherm to be at about 52km, and the Moho seems to be the transition zone of lower crust material with spinel lherzolite. If we take 1280℃ as the temperature of the top of asthenosphere, then the lithosphere-asthenosphere boundary should be at about 120km depth. The differential stress of the upper mantle is determined by using recrystallized grain size piezometry, while the strain rate and equivalent viscosity are determined by using the high temperature flow law of peridotite. The differential stress, strain rate and viscosity profiles constructed on the basis of the obtained values indicate that asthenospheric diapir occurred in this region during the Cenozoic time, resulting in the corresponding thinning of the lithosphere. However, the scale and intensity of the diapir was significantly less than that occurring in the North China region. Moreover, numerous small-scale shear zones with localized deformation might occur in the lithospheric mantle, as evidenced by the extensive occurrence of xenoliths with tabular equigranular texture.

A New Basal Titanosaur (Dinosauria: Sauropoda) from the Early Cretaceous of China

A new dinosaur of Early Cretaceous age was recently discovered from the Mazongshan area of northwestern Gansu Province, China. The new dinosaur represents a new genus and species of Sauropoda, and is among the most basal members of Titanosauria. Its finding also suggests that titanosaurs might have originated in Asia no later than the Early Cretaceous.

A Large Therizinosauroid(Dinosauria:Theropoda) from the Early Cretaceous of Northwestern China

We herein describe an associated partial postcranial skeleton of a theropod dinosaur discovered in the Lower Cretaceous Xinminpu Group of the Yujingzi Basin, in the Jiuquan area of Gausu Province, northwestern China. Features of its humerus, such as strongly expanded proximal and distal ends, a well developed medial tuberosity, distal condyles expressed on the humeral cranial surface, and a hypertrophied entepicondyle, definitively establish the therizinosauroid affinities of the specimen. It differs from other therizinosauroids in having a shallow, poorly demarcated glenoid fossa with a prominent rounded and striated tumescence on the dorsomedial surface of its scapular portion, and a pubis with a strongly concave cranial margin. It represents a new taxon, Suzhousaurus megatherioides gen. et sp. nov. Cladistic analysis recovers Suzhousaurus as the sister taxon of Nothronychus mckinleyi from the mid-Cretaceous of western North America; together, they are basal members of the Therizinosauroidea, more derived than the Early Cretaceous Falcarius and Beipiaosaurus but less derived than Alxasaurus and the Therizinosauridae. Along with ＂Nanshiungosaurus＂ bohlini from possibly coeval beds in the Mazongshan area of northern-most Gansu, Suzhousaurus represents one of the largest-known Early Cretaceous therizinosauroids, demonstrating that this clade attained considerable body size early in its evolutionary history.

DEVELOPING CHINA'S GREAT NORTHWEST AND PROMOTING S&T COOPERATION BETWEEN GANSU PROVINCE AND THE CAS

While this year is the 50th anniversary of the founding of the People’ s Republic of China, it also marks a half a century of the Chinese Academy of

Giant Landslides Triggered by the 1718 Tongwei Earthquake in Pan'an, Gansu Province, China

Great earthquakes in mountain areas always trigger severe geologic hazards such as landslides, debris flows and rock falls, thereby causing tremendous property damage and casualties. On 19th June, 1781, a Ms 7.5 earthquake occurred in Tongwei of Pan＇an, Gansu Province, west China,

Soil geochemical prospecting prediction method based on deep convolutional neural networks-Taking Daqiao Gold Deposit in Gansu Province, China as an example

A method is proposed for the prospecting prediction of subsurface mineral deposits based on soil geochemistry data and a deep convolutional neural network model.This method uses three techniques(window offset,scaling,and rotation)to enhance the number of training data for the model.A window area is used to extract the spatial distribution characteristics of soil geochemistry and measure their correspondence with the occurrence of known subsurface deposits.Prospecting prediction is achieved by matching the characteristics of the window area of an unknown area with the relationships established in the known area.This method can efficiently predict mineral prospective areas where there are few ore deposits used for generating the training dataset,meaning that the deep-learning method can be effectively used for deposit prospecting prediction.Using soil active geochemical measurement data,this method was applied in the Daqiao area,Gansu Province,for which seven favorable gold prospecting target areas were predicted.The Daqiao orogenic gold deposit of latest Jurassic and Early Jurassic age in the southern domain has more than 105 t of gold resources at an average grade of 3-4 g/t.In 2020,the project team drilled and verified the K prediction area,and found 66 m gold mineralized bodies.The new method should be applicable to prospecting prediction using conventional geochemical data in other areas.

A Study of Siliceous Pneumoconiosis in a Desert Area of Sunan County,Gansu Province,China

Three hundred and ninety five residents in a desert area were examined with chest radiographs and 28 cases with siliceous pneumoconiosis were found. The prevalence of siliceous pneumoconiosis was 7.09%, and that over 40 years of age was 21%. The histological findings of lungs from a camel living in that area for 20 years also confirmed to have siliceous pneumoconiosis.

Research on Consumption Structure of Rural Residents in Gansu Province Based on ELES Model

By using cross-section data on consumption structure of rural residents in Gansu Province in 2007 and 2008,this paper adopts ELES model to conduct empirical analysis on consumption structure of rural residents in Gansu Province.It indicates that in the current consumption structure of rural residents in Gansu Province,food expenditure is still at the most important and basic level;the overall consumption level of rural residents in Gansu Province is not high;at present,the consumption of rural residents in Gansu Province still hinges in a large measure on income,vulnerable to the price fluctuation.Consequently,increasing farmers' income and stabilizing the level of commodity price,turns out to be a foundation as well as an important approach to improve consumption structure of rural residents in Gansu Province.

Research and Analysis on Refined Precipitation Forecast Method of Highway during Flood Season in Gansu Province

In this paper, T639 global spectral model numerical forecast products issued by numerical prediction center of China Meteorological Administration and precipitation data at 676 regional stations of Gansu during flood season were used firstly for interpretation. Then, through the establishment of multiple linear stepwise regression equation, daily precipitation forecast with the time interval of 6 h during 0 -72 h in May, 2013 in Gansu Province was obtained. By precipitation forecast verification analysis, it was found that the precipitation forecast in Hexi region and central Gansu Province had best effect; forecast in some places of east Hedong region had relatively good effect; part of the city or state forecast effect in the plateau slope zone was relatively lower. The refined precipitation forecast had certain reference and use value in the post-production Gansu Province highway forecasting during flood season.

基于LightGBM模型的甘肃省临夏县滑坡易发性评价

甘肃省临夏县地质环境复杂,滑坡灾害发育,对当地居民生产生活造成严重威胁,亦对工程建设的开展造成一定阻碍,因此,选取高效准确的机器学习方法对临夏县进行滑坡易发性评价具有重大意义。首先依据遥感影像和野外勘察资料,选取了1718处滑坡样本,遴选了滑坡灾变的16种影响因子并建立滑坡影响因子评价体系;再结合预测精度和运行时间等指标对比了轻量级梯度提升机(LightGBM)模型与主流机器学习模型的性能;最后利用混淆矩阵分级方法进行了基于LightGBM模型的临夏县滑坡易发性评价。结果表明:临夏县重要滑坡影响因子为地表植被和地形地貌因子,其中土地覆盖为最主要影响因子;LightGBM模型预测精度高达0.931,且运行速度仅为11.7 s,既能保证高精度又极大提升了运行效率;在抽稀后的数据集上,LightGBM模型的预测表现、校准程度和分级结果均优于随机森林(RF)模型;混淆矩阵分级法的较高和高易发区内滑坡分布更为集中,在14.94%的区域内分布着86.86%的滑坡灾害点。滑坡易发性评价结果较好地反映了研究区内滑坡分布发育情况,可为当地工程建设及防灾减灾工作提供一定指导。

临夏盆地中新世一可能的新犬熊

报道了甘肃临夏盆地具体产地未知的一件犬熊下颌。该下颌展现出进步的牙齿特征,与过去发现于欧洲以及南亚的马德里犬熊Magericyon近似。这件犬熊化石指示东亚的犬熊多样性比以往认知的更高,但还需要更多具有明确层位信息的犬熊化石来进一步揭示东亚犬熊的演化。

抗战时期陕甘宁边区疾病防治工作的成就、经验及当代价值研究

陕甘宁边区的疾病防治工作是中国共产党领导医疗卫生事业的重要起点之一,为新中国提出“预防为主”等四大卫生方针奠定了基础。本文分析了陕甘宁边区在疾病防治上面临的严峻挑战,呈现了中国共产党为应对这些挑战进行的制度创新以及疾病防治体系的重新构建,认为抗战时期陕甘宁边区发展医疗卫生事业最大的特点是坚持人民性与公益性。这揭示了新中国成立后乃至当前我国疾病防治体制形成的历史渊源,为新时代卫生发展提供历史经验。

陕甘宁边区烈士褒扬工作的历史考察

抗日战争和解放战争时期,陕甘宁边区通过制定烈士褒扬政策、建立褒扬机构和举办各种形式的纪念活动等方式,维护烈士权益、保障烈属生活,并通过宣扬烈士的光荣事迹和英烈精神,教育革命群众和革命队伍。这些工作不仅凝聚了人心,动员了社会力量,也激发了人们的爱国情感和革命意识,弘扬了民族道义,不仅是党和政府人道主义精神的体现,更是民族道义的彰显,在革命战争时期具有重要意义。

甘肃省土地沙漠化的治理与启示

新中国成立以来,甘肃省的土地沙漠化一度加重,新世纪后才逐步逆转。为建设经济和治理生态环境,甘肃省实施了生物治沙、机械治沙、化学治沙、政策法规治沙、农业治沙、工程治沙及资金治沙等一系列措施,基本遏制了土地沙漠化发展、实现了“山水林田湖草沙”的动态平衡、初步构建了国家西部生态安全屏障、治沙工作走到世界前列,达到了“绿进沙退”的治理目标。但同时,甘肃省的土地沙漠化治理中仍存在与经济社会发展的矛盾、治理投入不足,市场融资困难、对自然规律把握不准、缺乏前瞻性和创新性等不足。为进一步推动和完善治沙工作,必须加大沙产业投入;树立“人与自然和谐共生”观念;架构科学治沙体系;加强理论研究、平台与人才队伍建设;完善治沙制度。

甘肃红色文化融入“中国近现代史纲要”教学研究

甘肃省在中国革命、建设、改革过程中发挥了不可替代的作用,有着丰富而独特的红色文化。这些红色文化的内蕴价值高度契合“中国近现代史纲要”课程教学内容和目标,是甘肃高校进行思想政治工作,培育时代新人的重要依托。深入挖掘甘肃红色文化的丰富资源,剖析甘肃红色文化融入“中国近现代史纲要”的必要性,并在原则要求的指导下按照学校建设、教师教学等方面设置教学路径,有利于深化甘肃红色文化的内涵与价值,提升甘肃红色文化影响力,丰富与创新“中国近现代史纲要”教学内容与形式,推动教学工作深入浅出、落地落实。