长江经济带土壤质量评价及产地适宜性初步研究

开展土壤质量评价对科学划定永久基本农田及统筹优化农业生产布局具有重要指导意义。本文采用内梅罗综合污染指数法、分级法、累积频率法和综合判定法,参照《土壤环境质量农用地土壤污染风险管控标准》(试行)(GB 15618—2018)和《绿色食品产地环境质量》(NY/T 391—2013),对长江经济带土壤重金属污染、酸碱度、有益元素丰缺和绿色农产品产地适宜性进行评价。研究区土壤质量总体良好,清洁土壤面积34.84万km²,其重金属含量继承了自然背景特征; 三级及以下土壤面积6.94万km²,呈斑块及星点状分布于赣东北、赣南、湖南长沙—郴州一带、沿江及贵阳、昆明等地,其重金属为自然富集或受矿业开发、煤炭和石油的燃烧及工业“三废”排放的影响。酸性土壤面积33.56万km²,分布于江西、湖南、宁波—台州沿海和金华衢州盆地,碱性土壤面积15.69万km²,分布于苏北平原、环洞庭湖、成都平原以及沿长江一线,其土壤酸碱度与土壤类型有关。土壤有益元素丰缺与第四系沉积物成土母质有关,土壤有益元素适量及以上区域面积34.44万km²,分布于四川阿坝、成都盆地、环洞庭湖、环鄱阳湖、安徽沿江、苏北沿海和杭嘉湖平原; 土壤有益元素缺乏区面积13.89万km²,分布于赣南、江淮、鄂东北以及云南玉溪等地。绿色农产品产地最适宜区、适宜区和不适宜区面积分别为22.49万km²、18.78万km²和18.28万km²。依据区内绿色农产品产地适宜性、土壤环境质量和立地条件划分出7片永久农田保护建议区。     

基于地层结构组合的第四纪地质单元划分研究——以皖江经济带沿江丘陵平原区为例

为支撑地质条件复杂地区的水文地质、工程地质和环境地质调查研究,在皖江经济带沿江丘陵平原区通过系统分析第四纪地层的岩性、结构、构造等组合,以地貌以及第四系成因、沉积相和沉积物物源为指标,结合已有区域第四纪研究成果以及年代地层和岩石地层划分标准,进行皖江沿江丘陵平原区“第四纪地质单元”划分,共划分出冲积-湖积平原地质单元、洪积-坡积岗地地质单元和残积-剥蚀丘陵地质单元3个一级地质单元,总结了7种类型第四纪地层结构组合及其特征,为区域水文地质和工程地质调查与研究奠定了基础。     

Magmatic activity and its geological significance in Early Jurassic in Mangui area of Inner Mongolia

By investigating the U-Pb zircon isotope geochronology and petrogochemistry of the major magmatic rocks in Mangui area, the authors in this paper discussed the forming era, tectonic background and geological significance. A large amount of intrusive rocks and a small amount of medium-acid volcanic rocks in Early Jurassic were found in this area. U-Pb dating by LA-ICP-MS method shows that the ages are from (199±1)Ma to (184±1)Ma and the rock types can be divided into fine-medium-grained quartz diorite, medium-grained granodiorite, fine-medium-grained monzogranite, medium-fine-grained macrophenocryst monzogranite, rhyolite, dacite and andesite, which didn’t ouur in Neoprotezoic-Paleozoic period as previous researchers thought, revealing the tectonic and magmatic activities during the Early Mesozoic period. The geochemical results show that the rocks are Ⅰ-type magmatic rocks of subluminous-peraluminous high-K calc-alkaline series. The fractionation between light and heavy rare-erath elements((La/Yb)_N= 3.42~32.96) and the Eu depletion degree is not complied with the evaluation from basic to acidic. The large ion lithophile element Ba is relatively rich and Rb, Sr are relatively delicient. The high field strength elements Th and U are relatively rich and Nb, Ti, Y are relatively deficient. The magma origin and tectonic setting show that quartz diorite and medium-fine-grained macrophenocryst monzogranite come from crust-mantle mixed magma, while the medium-acid volcanic rocks, granodiorite and fine-medium-grained monzogranite are from the partial melting of crustal materials, whose formation is connected with the evolution of Mongol-Okhotsk Suture Zone. The geology and geochemistry of the Early Mesozoic magmatic rocks indicate that the middle part of Mongol-Okhotsk Ocean might begin subduction at the end of the middle Triassic and close the Early Jurassic. The peak collision might take place at the Early Jurassic, not in the Late Triassic as previous thought. The Mohe over-thrust nappe system might form in the remote effect of southward extrusion during the closing process of the eastem part of Mongol-Okhotsk Ocean. The middle and eastern Mongol-Okhotsk Ocean closing age is of great importance to reveal the basin-range tectonic formation during the Middle Jurassic to the Late Cretaceous in Northeast China.     

声波测试法在判别地下厂房EDZ中的应用

洞室开挖不可避免地会损伤岩体, 对于规模巨大、布置异常复杂的水电地下厂房围岩尤甚, 合理地确定开控损伤区(EDZ)分布成为地下洞室的信息化设计、施工和安全运营的关键性问题.在引入EDZ概念及强EDZ、弱EDZ和基本未损区分区的基础上, 提出采用声波测试方法来确定强EDZ和弱EDZ的分布.将声波波速-深度曲线划分为Ⅰ型、Ⅱ型和Ⅲ型等3种曲线类型, 根据曲线特征点, 对EDZ进行定性、半定量的初判.根据波速计算得出的损伤因子D, 对强、弱EDZ和基本未损区进行定量的判别.首次提出的基于声波测试法, 定性、半定量和定量相结合的综合研判法具有创新性, 为客观评价地下洞室EDZ提供了科学的方法.      

Early Cambrian Ichnofossils from the Mussoorie Syncline and revision of Trace Fossil Biozonation of the Lesser Himalaya,India

A new locality bearing ichnofossils of the Cruziana Assemblage Zone-Ⅲ from the Mussoorie syncline,Lesser Himalaya,is located in rocks of Member-B of the Dhaulagiri Formation,Tal Group,exposed along the Maldewta-Chhimoli fresh road cut section.The site yielded ichnofossils Bergaueria perata,Cochlichnus anguineus,？Diplocraterion isp.,Dimorphichnus obliquus,diplichnitiform Cruziana bonariensis,Diplichnites gouldi,Glockeria isp.,Helminthopsis isp.,Monomorphichnus lineatus,Phycodes palmatum,Palaeophycus striatus,Planolites beverleyensis,Planolites montanus,Treptichnus cf.T.pedum,scratch marks and an undetermined worm impression.An Early Cambrian age （Cambrian Series 2） is assigned to the ichnofossil-bearing strata based on the stratigraphic position between the Drepanuroides and Palaeoolenus trilobite zones.A revised Cambrian ichnofossil zonation is presented for the Tal Group of the Mussoorie syncline.Together with their occurrence on rippled surfaces,and the lateral displacement of some trackways （due to current action）,a sub-aqueous shallow-marine depositional setting is proposed for the rocks of Member-B.     

中国境外经贸合作区的政策移动研究——以天津经济技术开发区和中埃·泰达苏伊士经贸合作区为例

中国境外经贸合作区的建设是国内特殊经济区发展经验在空间上的延展。基于东道国独特的发展条件,需要将国内园区的建设经验进行调整,再运用到中国境外经贸合作区以适应东道国本地化发展。构建政策移动的理论框架,采用案例分析和比较研究法,以天津经济技术开发区与中埃·泰达苏伊士经贸合作区为例,将国内园区与境外经贸合作区的相关政策进行对比分析,验证政策在不同国家“土壤环境”中的适应性。研究发现：① 根据政策施行的影响因素和不同作用,政策移动可以分为政策移植、政策调试和政策创新;② 规划建设经验、运营管理经验、环保政策、人才政策等可直接进行政策移植;发展模式和文化政策要进行政策调试;法规政策、晋升政策和优惠政策需要进行政策创新;③ 园区的共性体现在国内园区成熟经验的借鉴、人才的培育与储备、园区生态环境的保护以及基础设施和配套设施的完善;④ 园区的个性体现在文化的求同尊异、园区品牌的打造、晋升制度的创新和协调机制的建立等。创新性地运用政策移动性理论将国内和国外园区进行关联研究,揭示了境外经贸合作区的移植、调试和创新国内园区政策的过程,深化了政策移动理论的内涵,丰富了境外经贸合作区的理论研究成果。     

40Ar/39 mineral ages from the Scituate Granite, Rhode Island: implications for Late Palaeozoic tectonothermal activity in New England

The alkalic Scituate Granite was emplaced into crystalline sequences within the New England Esmond–Dedham terrane in the Late Devonian ( c. 370 Ma). Variably recrystallized amphibole (iron-rich, hastingsite–hastingsitic hornblende) from four variably deformed samples of the pluton record south-westerly younging ⁴⁰Ar/³⁹Ar plateau ages ranging between 276 and 263 Ma. These are interpreted to date diachronous cooling through temperatures appropriate for intracrystalline retention of argon following late Palaeozoic orogenic activity. Iron-rich biotite concentrates from the samples record only slightly younger ages, and therefore suggest relatively rapid post-metamorphic cooling. The ⁴⁰Ar/³⁹Ar ages indicate that the late Palaeozoic tectonothermal overprint was much more regionally pervasive than was previously considered. The apparent timing of this activity is similar to previous estimates for the chronology of high-grade metamorphism throughout the adjacent Hope Valley terrane and for phases of ductile movement on the intervening Lake Char–Honey Hill fault system.     

Structural and stratigraphical constraints on the kinematics history of the Southern Tan–Lu Fault Zone during the Mesozoic Anhui Province, China

The Tan–Lu Fault Zone (TLFZ) extends in a NNE–SSW direction for more than 2000 km in Eastern China. It has been considered either as a major sinistral strike-slip fault, as a suture zone or as a normal fault. We have conducted a structural analysis of the southern segment of this fault zone (STLFZ) in the Anhui Province. The ages (Triassic to Palaeocene) of the formations affected by the faults have been re-appraised taking into account recent stratigraphical studies to better constraint the ages of the successive stages of the kinematics of the STLFZ. Subsequently, the kinematics of the faults is presented in terms of strain/stress fields by inversion of the striated fault set data. Finally, the data are discussed in the light of the results obtained by previous workers.We propose the following history of the STLFZ kinematics during the Mesozoic. At the time of collision, a  NNE orientated Tan–Lu margin probably connected two margins located north of the Dabie and Sulu collision belts. During the Middle–Late Triassic, the SCB has been obliquely subducted below the NCB along this margin which has acted as a compressional transfer zone between the Dabie and Sulu continental subduction zones. The STLFZ has been initiated during the Early Jurassic and has acted as a sinistral transform fault during the Jurassic, following which the NCB/SCB collision stopped. A  NW-trending extension related to metamorphic domes was active during the basal Early Cretaceous ( 135–130 Ma); it has been followed by a NW–SE compression and a NE–SW tension during the middle–late Early Cretaceous ( 127 to  105 Ma, possibly  95 Ma); at that time the TLFZ was a sinistral transcurrent fault within the eastern part of the Asian continent. During the Late Cretaceous–Palaeocene, the STLFZ was a normal fault zone under a WNW–ESE tension.     

滇东老厂地区地热水成因：来自水化学和碳氢氧硫同位素的约束

滇东弥勒-师宗断裂带地热资源丰富,但是由于研究程度较低,成因机制不明,制约了区内地热资源的可持续开发利用。本文以弥勒-师宗断裂带北段老厂地区天然温泉水和地热钻孔水为研究对象,综合应用野外调查、水文地球化学和环境同位素方法,对区内地热水的地球化学特征和成因机制进行了研究。结果显示,区内地热水pH值介于7.30～8.12之间,TDS在224～382 mg/L之间,属于弱碱性淡水。地热水水化学类型为HCO₃·SO₄^Ca型和HCO₃·SO₄-Ca·Na型,且含有较高含量的Fe、As、Sb等微量组分,不宜饮用。地热水中HCO₃^-的δ¹³C值为-3.31‰～-7.79‰,计算得出参与水岩作用的CO₂的δ¹³C值为-9.50‰～-15.68‰,具有明显的沉积有机质来源特征。离子比值分析及硫同位素特征表明碳酸盐岩矿物和石膏的溶解是区内地热水主要离子来源的控制因素,此外赋存于浅部断裂带内...