Study on Conceptual Planning of Group Landscapes in Urban Core Areas—A Case Study of Conceptual Landscape Planning of the Core Area in Shuangsong Group,Wanzhou District of Chongqing City,China

The planning site was divided into a spatial structure of"one center,one corridor,two axes,two belts and three communities"and traffic system designed to a 3-grade road system of"artery,secondary artery and by-pass".Meanwhile,a 3-ring structure of the planning site was constructed:diffusion waterfront landscape belt,waterfront pathway and core eco-green island.Finally,the planning concepts for major ecological constructions were given.This study tried to explore the group eco-landscape pattern in urban core areas so as to provide a strategic instruction for the regional sustainable development.

Late Mesozoic Ore-forming Events in the Ningwu Ore District, Middle-Lower Yangtze River Polymetallic Ore Belt, East China: Evidence from Zircon U-Pb Geochronology and Hf Isotopic Compositions of the Granodioritic Stocks

Late Mesozoic volcanic-subvolcanic rocks and related iron deposits, known as porphyry iron deposits in China, are widespread in the Ningwu ore district （Cretaceous basin） of the middle-lower Yangtze River polymetallic ore belt, East China. Two types of Late Mesozoic magmatic rocks are exposed： one is dioritic rocks closely related to iron mineralization as the hosted rock, and the other one is granodioritic （-granitic） rocks that cut the ore bodies. To understand the age of the iron mineralization and the ore-forming event, detailed zircon U-Pb dating and Hf isotope measurement were performed on granodioritic stocks in the Washan, Gaocun-Nanshan, Dongshan and Heshangqiao iron deposits in the basin. Four emplacement and crystallization （typically for zircons） ages of granodioritic rocks were measured as 126.1±0.5 Ma, 126.8±0.5 Ma, 127.3±0.5 Ma and 126.3±0.4 Ma, respectively in these four deposits, with the LA-MC-ICP-MS zircon U-Pb method. Based on the above results combined with previous dating, it is inferred that the iron deposits in the Ningwu Cretaceous basin occurred in a very short period of 131-127 Ma. In situ zircon Hf compositions of εHf（t） of the granodiorite are mainly from -3 to -8 and their corresponding 176Hf/177Hf ratio are from 0.28245 to 0.28265, indicating similar characteristics of dioritic rocks in the basin. We infer that granodioritic rocks occurring in the Ningwu ore district have an original relationship with dioritic rocks. These new results provide significant evidence for further study of this ore district so as to understand the ore-forming event in the study area.

Molybdenite Re-Os,titanite and garnet U-Pb dating of the Magushan skarn Cu-Mo deposit,Xuancheng district,Middle-Lower Yangtze River Metallogenic Belt

The Magushan skarn Cu-Mo deposit is a representative example of the skarn mineralization occurring within the Xuancheng ore district of the Middle-Lower Yangtze River Metallogenic Belt of eastern China.The precise age of an ore deposit is important for understanding the timing of mineralization relative to other geological events in a region and to fully place the formation of a mineral deposit within the geological context of other processes that occur within the study area.Here,we present new molybdenite Re-Os and titanite and andradite garnet U-Pb ages for the Magushan deposit and use these data to outline possible approaches for identifying genetic relationships in geologically complex areas.The spatial and paragenetic relationships between the intrusions,alteration,and mineralization within the study area indicates that the formation of the Magushan deposit is genetically associated with the porphyritic granodiorite.However,this is not always the case,as some areas contain complexly zoned plutons with multiple phases of intrusion or mineralization may be distal from or may not have any clear spatial relationship to a pluton.This means that it may not be possible to determine whether the mineralization formed as a result of single or multiple magmatic/hydrothermal events.As such,the approaches presented in this study provide an approach that allows the identification of any geochronological relationships between mineralization and intrusive events in areas more complex than the study area.Previously published zircon U-Pb data for the mineralization-related porphyritic granodiorite in this area yielded an age of 134.2±1.2 Ma(MSWD=1.4)whereas the Re-Os dating of molybdenite from the study area yielded an isochron age of 137.7±2.5 Ma(MSWD=0.43).The timing of the mineralizing event in the study area was further examined by the dating of magmatic accessory titanite and skarn-related andradite garnet,yielding U-Pb ages of 136.3±2.5 Ma(MSWD=3.2)and 135.9±2.7 Ma(MSWD=2.5),respectively.The dating of magmatic and hydrothermal activity within the Magushan area yields ages around 136 Ma,strongly suggesting that the mineralization in this area formed as a result of the emplacement of the intrusion.The dates presented in this study also provide the first indication of the timing of mineralization within the Xuancheng district.providing evidence of a close genetic relationship between the formation of the mineralization within the Xuancheng district and the Early Cretaceous magmatism that occurred in this area.This in turn suggests that other Early Cretaceous intrusive rocks within this region are likely to be associated with mineralization and should be considered highly prospective for future mineral exploration.This study also indicates that the dating of garnet and titanite can also provide reliable geochronological data and evidence of the timing of mineralization and magmatism,respectively,in areas lacking other dateable minerals(e.g.,molybdenite)or where the relationship between mineralization and magmatism is unclear,for example in areas with multiple stages of magmatism,with complexly zoned plutons,and with distal skarn mineralization.

Petrographic Studies of Pb-Zn Ore Deposits of Rajpura-Dariba-Bethumni Belt in District Udaipur (Rajasthan) India

The Proterozoic Aravalli-Delhi orogenic complex hosts a large number of economically important stratabound base metal sulphide deposits. In the present work, rock samples taken from Outcrop and Underground Mine of Sindeskar Kalan, Vedanta Group, Rajpura-Dariba-Bethumni Belt which are located at a distance of 76 Kms from Udaipur District (Rajasthan) have been studied. The chief litho units of the group are identified which contain sulfide-bearing calc-silicate and graphite mica schist, dolomite marble, calc-biotite schist and quartzite. Importance to the ore minerals like galena and sphalerite which have been reported in association with the buffer minerals like pyrite and pyrrhotite occurr in the host rocks of the study area. Ore petrography denotes two types of sphalerites, 1) highly deformed and dark brown colour, 2) less deformed and with light yellow colour. Galena shows high reflectance and a network of triangular pits. Pyrite shows high reflectance and anomalous anisotropism because of high brittleness.

Petrological Study on the Ductile Shear Zones in the Core of the Eastern Qinling Orogenic Belt in Western Henan

A series of ductile shear zones of the overthrust and strike-slip-types and related ductile shear metamorphicrocks, including tectonic melange and mylonites. were formed in the core of the Qinling orogenic belt in thecourse of the Caledonian-Indosinian ductilc and brittle-ductile reworking. The study on their petrography. va-riations in composition and conditions of formation is conducive to revealing the metamorphism-deformationhistory of the core of the Qinling orogenic belt and further to understanding the dynamic mechanism of its evo-lution.

长江中下游成矿带南陵—宣城矿集区中生代构造—岩浆—成矿特征及其地质意义

安徽南陵—宣城矿集区是长江中下游成矿带中一个新确立的矿集区,近年来找矿勘查工作取得重要进展。笔者等在广泛收集以往区域地质调查以及最新地球物理探测和矿床地质勘查成果的基础上,系统总结了矿集区地质构造、岩浆岩和铜多金属矿床的地质和地球化学特征,探讨了中生代时期区域构造作用与岩浆作用和成矿作用的相互关系。研究认为,南陵—宣城矿集区构造上为一个受深大断裂控制的中生代—新生代陆相凹陷—断陷火山—沉积盆地,盆地之上叠置古生代地层构成的NE向指状展布的复背斜/逆冲推覆体,盆地基底地层组成和构造特征与盆地之上叠置的复背斜/逆冲推覆体基本一致,且两者均发育相同时代和特征的侵入岩及相关铜多金属矿床。南陵—宣城矿集区构造—岩浆—成矿特征总体上与长江中下游成矿带其他地区基本一致,反映自中生代以来受古太平洋板块向欧亚板块之下俯冲作用的控制,经历了强烈的陆内变形改造以及相应的多期次NW—SE向挤压作用和拉张作用。南陵—宣城矿集区构造—岩浆—成矿特征同时又具有其独特性,表现在其地质构造格架、侵入岩和矿床特征与长江中下游成矿带其他火山—沉积盆地明显不同,反映其在区域构造空间以及地壳基底结构和组成上的差异,同时揭示南陵—宣城矿集区是长江中下游成矿带跨构造单元复合系统的典型代表。

丝绸之路经济带核心区建设职业教育市域产教联合体实践研究

新疆处于丝绸之路经济带核心区,是我国西部地区的重要经济中心,也是我国重要的战略区域。当前,新疆在推动职业教育与地方经济发展联动方面,开始探索建立市域产教联合体,以促进产业升级和人才培养。在实践中,市域产教联合体面临着许多困难和问题。从政策环境、校企合作、人才培养、科技创新等方面,探讨新疆建设市域产教联合体面临的主要困难、问题和挑战。在此基础上,提出建设职业教育市域产教联合体的路径,包括政策支持、产学研合作、人才培养、社会参与等方面。

钢丝绳芯传送带损伤的漏磁检测

钢丝绳芯传送带是用于输送物料的高强度传送带,广泛应用于采矿、建筑、冶金等领域,其在长时间运行后,内部钢丝绳会出现断丝、磨损等缺陷,影响生产安全。基于漏磁检测技术开展了钢丝绳芯传送带的损伤检测,首先建立了含有不同类型和不同截面积损伤的传送带漏磁检测有限元模型,分析了缺陷漏磁场空间分布特性和变化规律,然后在实验室条件下开展传送带漏磁检测试验,采用滑动平均降噪与小波降噪相结合的方法对检测信号进行降噪处理,降噪后的信号能够清晰地显示出缺陷损伤严重程度。仿真和试验结果表明,漏磁检测技术能够检测出钢丝绳芯传送带中不同类型和不同截面积的损伤,能够为传送带使用和维护提供决策依据。

雪峰弧构造带钻孔轨迹控制关键技术研究

随着近年来矿产资源勘查要求的提高,岩心钻孔的深度及地层复杂性也不断加大,为能精准的钻遇靶区矿体以实现地质目的,对钻孔轨迹控制的要求越来越高。雪峰弧构造带部分工作区地层倾角大、软硬交替频繁、地层破碎,实际施工中地层造斜情况严重,随着孔深增加导致终孔轨迹与靶区矿体偏差较大,影响矿产资源勘查的精度和质量。通过对该工作区地层造斜情况的深入分析,在ZK1001钻孔绳索取心钻进施工中采用初级定向孔技术和满眼钻具工艺,大幅度提高了钻孔孔身质量,较好地实现钻孔轨迹控制。并通过试验不同的岩心钻具组合,提出了满眼钻具组合的优化意见和建议,为工作区岩心钻孔轨迹控制提供技术参考。

“一圈一带两区”格局下沈阳都市经济圈发展方向和对策

沈阳都市经济圈是辽宁省“一圈一带两区”的核心功能区,是辽宁省经济高质量发展的重要引擎。本文对沈阳都市经济圈发展现状和问题的分析,阐明沈阳都市经济圈的地位和作用,指出未来沈阳都市经济圈应向优化空间结构、构建全产业链深度协作的现代产业体系、继续深化企业改革以及加强区域联动等方面重点发展。最后,提出优化都市圈营商环境、完善互联互通的交通基础设施网络、培养吸引高素质人才等有针对性的提出沈阳都市经济圈的发展对策。

提升沿边口岸在“一带一路”核心区建设中的作用研究——以新疆口岸调研为例

沿边口岸作为深化与周边国家互联互通的关键节点和重要门户,发挥着大通道、试验田和对外示范窗口的重要作用,成为“一带一路”创新对外开放的前沿阵地。本文以新疆沿边口岸调研为例,从“五通”的视角阐述了新疆丝绸之路经济带核心区建设的基本情况,并根据新疆陆路和铁路口岸、边民互市贸易区、中哈霍尔果斯边境国际合作中心等地调研情况,分析新疆沿边口岸参与“一带一路”核心区建设中,在边贸、物流、平台等方面的发展现状和存在的问题,并提出相关对策建议。

胶东焦家金矿带招贤金矿床的原位黄铁矿热电性特征及找矿指示意义

胶东金矿集区是中国最大的黄金产地,焦家金矿带是重要的成矿亚带之一,产出了一系列超大型、大型金矿床,资源量占整个胶东地区的1/4,招贤金矿床为焦家带深部的大型金矿床。对招贤金矿床深部成矿潜力的评价可为焦家金矿带乃至胶东地区的金矿床深部找矿预测提供科学依据。文章选取了招贤金矿床3个钻孔6个不同标高的矿石样品,进行了详细的矿物学、成矿元素以及黄铁矿热电性特征研究。通过扫描电镜及半定量成分分析,鉴别了银金矿是主要的金矿物,常以包体的形式赋存于黄铁矿中或其裂隙中。金矿床围岩蚀变分带明显,显示了较强的矿化作用,其矿物共生组合和多阶段的成矿特征与胶东其他超大型金矿床相似。通过Au等成矿元素分析,笔者认为Au及其相关性高的元素具有规律性的垂向变化特征,元素沉淀具有垂向间断性。利用原位黄铁矿热电性测试方法,精准测定了黄铁矿热电性参数,并通过热电系数离散程度、热电性导型、形成温度、延伸指数等计算分析,综合讨论了金矿床成矿潜力,认为招贤金矿床及焦家金成矿带的深部具有较好的找矿前景。

粤西庞西垌地区非结构化地质信息机器可读表达与致矿异常区域智能预测

大数据挖掘与机器学习算法应用已成为成矿预测研究的重要趋势,但如何使非结构化地质数据进行机器可读表达成为需要克服的难点。本研究针对粤西庞西垌矿集区开展地层、岩性、断裂等非结构化地质信息面向机器可读的转换处理,并进而应用机器学习算法对水系沉积物地球化学测试数据和构造、地层等综合地质信息进行挖掘,提取致矿异常特征,最终实现智能圈定致矿异常找矿靶区。独热编码算法与空间加权主成分分析中的权重变量方法组合应用,实现了地层、岩性和断裂构造等非结构化地质信息的结构化转化,并最大限度地保留其所包含的地质信息。单分类支持向量机和自编码网络异常检测算法的应用,解决了研究区已知矿点与非矿点数据不平衡问题。对多源地质数据的集成和综合生成的预测结果与研究区铅锌矿床的空间分布和实际的地质构造情况相对一致,表明上述算法能够有效识别找矿潜力区并寻找潜在的矿床。与传统的勘查地球化学方法相比,本研究中的分析方法能够处理和集成多源的地质致矿信息,可应用于尚未发现矿床的找矿潜力区,提高发现矿床的可能性和找矿工作的效率。

基于中心城市偏向的城市功能与产业发展失衡问题研究——以长江经济带为例

本文在利用熵值法测算2008—2019年长江经济带96个城市市场型功能、非市场型功能和产业发展的基础上,构建城市功能与产业发展失衡度指标,实证分析中心城市偏向对城市功能与产业发展失衡的影响。研究结果发现,市场偏向降低城市功能与产业发展失衡度,政府偏向则加剧二者的失衡度;中心城市偏向通过城市开发和公共服务建设影响城市功能与产业发展失衡度;不同区域、不同市场化程度和不同规模城市间中心城市偏向影响城市功能与产业发展的失衡度存在明显差异性。通过将撤县设区的准自然实验作为中心城市偏向的外生冲击检验,发现撤县设区强化了城市功能与产业发展失衡度,为深入理解中心城市偏向的影响提供经验证据。

桂西隆林-西林锑金矿集区成矿控制因素探讨

华南锑成矿省锑资源储量占全国83%以上,位于成矿省西南部的滇黔桂锑矿带是华南锑成矿省的重要组成部分。文章以滇黔桂锑矿带中部桂西隆林-西林锑金矿集区为例,系统分析了区内82个矿床(点)的赋矿层位、赋矿围岩岩性、容矿构造特征及锑、金矿床共伴生关系,结合3个典型矿床调查及岩浆岩时空分布,探讨锑成矿作用与碎屑岩、岩浆岩的成因联系。研究结果表明:具有高锑背景值的炭质泥页岩和富黄铁矿砂岩是研究区锑成矿的有利岩性,为锑成矿提供了物质来源。岩浆作用对锑成矿既可以起到直接作用(Sb和S来源)也可以起到间接作用(热源),两者均有利于锑矿床的形成。容矿构造分析显示研究区经历了印支期南北向挤压,随后叠加中晚侏罗世北西—南东向挤压。北西西—南东东向和北东—南西向断裂及其交汇处是有利的容矿空间。隆林-西林矿集区锑、金矿床统计显示,区内以独立的锑、金矿床为主,暗示研究区锑、金成矿流体可能多为不同来源流体。在上述研究基础上,文章提出桂西隆林-西林锑金矿集区勘查有利区域:新州背斜核部下泥盆统郁江组炭质泥页岩和富黄铁矿粉砂岩是锑矿勘查的重点层位;隆林县弄桑-石家寨北西西—南东东向断裂带内隐伏岩体周边和西林县北西西—南东东向斗皇-西林断裂与北东—南西向断裂的交汇部位是锑矿勘查的有利区域。以上成果为研究区内锑金矿床成因和成矿规律认识提供新的思考,为区内锑矿床勘查提供方向。

氯化石蜡对钢丝绳芯阻燃输送带芯胶性能的影响研究

对比了不同含量氯化石蜡对钢丝绳芯阻燃输送带芯胶性能的影响,确定了25份氯化石蜡含量为综合性能最佳,芯胶性能既能满足标准要求也能满足生产要求。

涉农高职服务“一核一带一区”农业产业发展探索——以K职业学院为例

“一核一带一区”倡议的提出,对广东涉农高职服务区域农业产业发展提出了新要求,即传统涉农学科需要“提质升级”、传统涉农专业需要“扩面延伸”、传统涉农教学模式需要“根本转变”。为此,K职业学院应该优化专业结构,培养“一核一带一区”乡村振兴急需人才;优化人才培养方案,匹配“一核一带一区”乡村人才所需知识结构;优化创新创业教育,提升学生回乡创业所需技能;瞄准乡村振兴重点人群,提升学历教育;发挥资源优势,优化各级各类培训供给;促进政校联动,共建乡村促发展,培养定制化人才;开展多元化考核评价,确保人才培养质量,不断探索服务“一核一带一区”农业产业发展的新路径。

“一核一带一区”背景下企业财务效率提高研究

“一核一带一区”背景下经济发展质量要不断提高,因此各企业需要重视不断提高自身财务效率。阐述了“一核一带一区”与企业财务效率的内涵、“一核一带一区”背景下企业财务管理出现的变化,以及企业提高财务效率的重要价值;在此基础上,具体分析了企业财务效率提高的难点,如财务管理制度建设状况不理想、财务报表分析易受忽视、财务管理人员综合素养不高;并提出了加强财务管理制度建设、系统进行财务报表分析、加强财务管理人才队伍建设等策略。

钢丝绳芯输送带接头强度与预成型芯胶技术研究

钢丝绳芯输送带是带式输送机的牵引和运载构件,接头破坏是引起钢丝绳芯输送带故障的主要原因。为了提高输送带的接头强度和接头硫化效率,基于现有接头硫化工艺,提出了一种预成型芯胶敷设技术,以ST1600型钢丝绳芯输送带接头为研究对象,对该技术的应用进行了理论分析和试验研究。首先,建立输送带接头力学模型并进行受力分析,通过ANSYS Workbench软件研究钢丝绳水平、垂直间距不均匀性对接头强度的影响,然后,提出预成型芯胶敷设方法,通过芯胶流固耦合分析对比了填充式芯胶与三角形、梯形和半圆形芯胶凹槽对限制钢丝绳偏移的作用效果。最后,通过接头预成型芯胶硫化试验研究了该技术对输送带胶体粘合强度、接头硫化效率以及接头强度的影响。研究表明:输送带接头处钢丝绳的受力与其纵向位移有关,由于传统接头硫化作业中无法实现钢丝绳的均匀分布从而引起钢丝绳受力不均,影响接头强度,而钢丝绳水平间距相较垂直间距的变化对钢丝绳等效应力的影响尤为显著,更易引起接头钢丝绳的破坏。预成型芯胶敷设技术能够有效减少钢丝绳的偏移量,其中半圆形芯胶凹槽效果最优,水平方向减少70%,垂直方向减少86.9%。在相同硫化条件下,与填充式芯胶相比,三角形、梯形和半圆形芯胶凹槽硫化后的粘合强度分别提升了1.91%、−3.51%、2.48%,半圆形芯胶与钢丝绳结合度最好;采用半圆形芯胶凹槽的预成型芯胶技术敷设钢丝绳可减少70%作业时间,硫化后的输送带接头强度提高5.74%。研究结果可为钢丝绳芯接头硫化工艺的改进提供理论和实践指导。

选区激光烧结技术在复杂流道砂芯中的应用

介绍了选区激光烧结技术生产复杂流道砂芯的整套工艺流程,通过合适的选区激光烧结砂芯结构设计、成形制造工艺及覆膜砂原材料的选择,制造出了结构复杂的整体流道砂芯。原材料采用抗拉强度更高的覆膜宝珠砂、合理的砂芯定位支撑面和砂芯排气通道等措施,更能满足复杂薄壁流道砂芯的实际铸造需求,通过实际生产验证,利用选区激光烧结技术整体制造了复杂流道砂芯,生产的铸件尺寸精度达到CT8级,采用100/200目的覆膜砂原材料,流道表面粗糙度可达Ra 6.9~10μm。