In Situ Rb-Sr Dates of Muscovite and Sulfur Isotope of Pyrite from the Yangshan Gold Deposit in Western Qinling,China

Located along the southern part of the West Qinling orogenic belt,the Yangshan gold deposit is one of the largest in China.The major gold ores of Yangshan are disseminated in metasedimentary host rocks with minor native gold amounts in stibnite-gold quartz veins.Pyrite and arsenopyrite are the major Au-bearing minerals.Hydrothermal muscovite from gold-bearing quartz veins was dated using the in situ Rb-Sr method to determine the formation age of the Yangshan gold deposit.The Rb-Sr isochron date of the muscovite yielded 210.1±5.6 Ma(MSWD=1.2).This date is near the lower end of the period of the mineralized granitic dykes(210.49-213.10 Ma).Two stages of gold enriching process are recognized in the gold-bearing pyrite:the first is incorporated with the Co,Cu,As,Ni enrichment;and the second is accompanied by Bi,Co,Ni,Pb,Cu,Sb concentration.The in-situ sulfur isotopic values of pyrites show a restrictedΔ34s range of-1.43‰to 2.86‰with a mean value of 0.43‰.Trace-element mapping and in-situ sulfur isotopic analysis of pyrite suggest that the sulfur deposits are likely derived from a magmatic source and likely assimilated by sulfur from the sedimentary bedrock.Thus,magmatism plays a critical role in the formation of the Yangshan gold deposit.

Yangshan Gold Deposit:The Largest Carlin and Carlin-like Type Gold Deposit in China

Gold Headquarter of the CAPF has discovered the Yangshan super large-scale gold deposit in Gansu Province, which is a great breakthrough of gold exploration and prospecting in Western Qinling Mountains of China. The gold resources of this deposit achieved 308 tons with increasing potentials. Preliminary geological investigations indicate that the Yangshan gold deposit is located in the intra-continental collision orogenic belt; and the deposit was formed during the continent-continent collision orogenic processes. The geological characteristics of the deposit are similar to that of the typical Carlin-type gold deposits, while differences still exist. The ore-forming background is notably different from the Carlin gold deposit province in the United States; and the ore-forming fluids are similar with that of the orogenic-type gold deposit. Accordingly, the Yangshan gold deposit is a transitional type between the Carlin-type and the orogenic type gold deposits. At present, the Yangshan gold deposit is the largest Carlin and Carlin-like type gold deposit that is ever discovered in China. Researches on metallogeny, metallogenic model and ore-enrichment regularities of the Yangshan gold deposit are crucial to meet the pressing needs of the current geological investigation and ore exploration of the deposit.

Seabed deposition and erosion change and influence factors in the Yangshan Deepwater Port over the years

The seabed scouring and silting are very important to the construction of port and waterway engineering.Seabed deposition and erosion change is complicated due to the influence of sediment supply,human activities and other factors.The Yangshan Deepwater Port is the new deep water harbor,which is an important part of the Shanghai International Shipping Service Center.Its construction has received much attention.At present,the water depth from the 1st to the 3rd harbor district is currently suitable under regular dredging and tidal current action.The fourth harbor district will be built in the world’s largest fully-automated deep water wharf.In the study,bathymetry change of the entire sea area of the Yangshan Deepwater Port and the 4th harbor district(i.e.,PhaseⅣproject)waters were analyzed quantitatively using multiyear bathymetric,hydrological and sediment data.The results show that from 1998 to 2010,seabed changes are characterized by large volumes of erosion and sedimentation,which the southern part was deposited and the northern part was eroded in the inner harbor waters,but the seabed of the Kezhushan inlet was eroded.Seabed changes of PhaseⅣproject waters generally show a scour tendency in recent few years with the annual scour rate about 0.7 m.Among the many factors,the existence of Kezhushan inlet and its influence of the western water flow play an important positive role in water depth changes under the ebb tide action.

Similarities between Yangshan Harbor area and the Yangtze estuary

By analysis of published papers on the Yangtze estuary and hydrological and sediments data in Yangshan Harbor area, many similarities are found between Yangshan Harbor area and the Yangtze estuary. These similarities include the phenomenon of stagnating flow areas, the distributive characteristics of the highest suspended sediment concentration areas, superficial sediments and shoal bars. The stagnating flow area is the major similarity which causes other similarities. These similarities indicate that: 1) Turbidity Maximum and mouth bars in estuaries are mainly caused by the hydraulic balance of stagnating flow areas of estuaries; 2) The stagnating sand area of sands caused by stagnating flow area often locates on the narrower side of the stagnating flow area; 3) The location (or shape) of fine sediments area caused by stagnating flow area reflects the location (or shape) of the stagnating flow area. Both Yangshan Harbor area and the Yangtze estuary are the important developmental areas in the future (man-made similarity). In-depth studies on these similarities between Yangshan Harbor area and the Yangtze estuary will have momentous theoretical and practical significance.

Invasion and Morphological Variation of the Non- Indigenous Barnacle Chthamalus challengeri(Hoek, 1883) in Yangshan Port and its Surrounding Areas

Invasive species generally possess unique characteristics that allow them to survive the invasion process in order to establish and spread in new habitats. Successful invaders must resist both physical and physiological stresses associated with the changing environment. A common littoral barnacle, Chthamalus challengeri Hoek, 1883(Crustacea, Cirripedia), which is native to Japan, South Korea and northern China, has become established in the high-littoral zone adjacent to Yangshan Port, Shanghai, China. A comparison of the morphology of Chthamlus species from Zhoushan archipelago with previous description indicates the occurrence of C. challengeri. The new immigrant becomes a dominant species in certain high-intertidal habitats of the adjacent area to of Yangshan Port. C. challengeri was found in part of sampling sites in Zhoushan in 2010; however, it dispersed to all the eleven sampling sites in 2012. Densities of C.challengeri had increased over 10 times in the last 2 years, with the highest mean value reaching 39533 ± 6243 ind. m-2 in the new habitat. The specific ratios of both operculum area(Sa) to base area(SA) and average height of parietal plates(H) to length of base(L) revealed that C. challengeri displays morphological changes to resist stronger currents in the new habitats for invasion.

基于分形理论的蚀变异常遥感解译——以广东阳山县为例

围岩蚀变异常是热液型矿床的重要找矿标志,运用遥感技术解译提取围岩蚀变信息是辅助地质找矿的重要手段。本文采用主成分分析法提取广东阳山地区Landsat-5的TM遥感影像中铁染和泥化蚀变信息,对影像中所提取的异常主成分进行“像元-面积”划分并统计像元个数,再将异常阈值进行分形非线性划分,得到更为精准的分级方法。门限法是基于突变点选择阈值进行等级划分,在提取蚀变异常的结果中往往会包含大量的背景信息,利用分形理论确定临界值进行分级减少了这些信息的影响。本次研究通过门限法和分形方法两种划分方法对研究区的蚀变异常进行对比,最后根据研究区蚀变异常信息的分形特征,利用求和方法对研究区的铁染和泥化蚀变异常信息进行分级。结果表明,相对于门限法,在遥感蚀变信息提取中分形方法加强了阈值选取的准确度,并发现研究区泥化蚀变与铁染蚀变主要分布于北东部及北部区域,其它区域小面积离散分布,这可为矿产勘查工作提供更好的技术支撑。

甘肃文县阳山金矿床高楼山矿段构造叠加晕地球化学特征及岩浆—构造—成矿耦合关系简析

甘肃文县阳山金矿是产于勉县—略阳弧形缝合带中段内的超大造山型金矿床。在26年的勘探工作中,安坝和葛条湾矿段一直是阳山金矿勘查的核心矿段。高楼山矿段于2021年正式进入普查阶段。本文旨在更好地了解矿区的深部隐伏盲矿,并对其未来的发展前景进行预测。结果表明,高楼山矿段69号勘探线剖面的成矿及伴生元素构造叠加晕的轴(垂)向分带序列从上而下依次为:Cu-As-Pb-Zn-Mn-Co-Ag-Au-Sb-Mo-Bi;共圈定两处深部找矿靶区,在1850 m标高处,213号矿脉的前缘晕仍然存在,而且随着深度的增加,前缘晕的强度也在不断加强,这表明矿体正在向更深处延伸;而在1750 m标高处,前缘晕的增强更加显著,这暗示着深部可能存在隐伏的矿体。此外,在分析69号勘探线3个钻孔构造叠加晕的基础上,提出新的阳山金矿构造控矿模式——推覆体复式褶皱构造控矿,并对ZK4901岩心的千枚理、断层、岩体、矿(化)体产状特征,利用统计分析方法进一步佐证了该模式。本文研究认为阳山金矿主体受逆冲断裂构造作用控制,含矿构造以北倾为主,局部受到褶皱的制约,岩浆岩主要沿断裂带产出,可形成矿(化)体,并根据岩浆岩有无矿化,将矿(化)体产出类型分为“2大类、5小类”,同时指出岩浆热液与成矿关系密切,但高品位的矿体主要分布在千枚岩中。这将为今后的勘探和开采提供重要的参考。

簕竹属一新种——阳山篙竹

文章描述了簕竹属孝顺竹亚属一新种——阳山篙竹。阳山篙竹在形态上与撑篙竹(Bambusa pervariabilis McClure)、青秆竹(B.tuldoides Munro)和花眉竹(B.longispiculata Gamble ex Brandis)相似,区别在于阳山篙竹秆基部7~9节具黄绿色条纹,节间及箨鞘背面被暗棕色糙伏毛,箨鞘先端近截平或呈对称性宽拱形,箨鞘内侧先端边缘具卵圆状突起,箨耳近等大,不下延。

Yangshan A-Type Granites in the Lower Yangtze River Belt Formed by Ridge Subduction:Radiogenic Ca and Nd Isotopic Constraints

The Early Cretaceous aluminous A-type granites in the Lower Yangtze River belt(LYRB)can provide important insights into the Mesozoic magmatism in eastern China,but their origin remains highly controversial.In this study,radiogenic Ca-Nd isotopic analysis was performed for syenite porphyry and alkali-feldspar granite porphyry of the Yangshan pluton,a typical aluminous A-type granitic intrusion in the LYRB,to constrain its source and geodynamic setting.The results show thatε_(Ca)(126 Ma),ε_(Nd)(126 Ma)and K/Ca_(source) of the syenite porphyry range from-0.24 to+0.96,-7.2 to-6.0,and 0.31 to 1.26,respectively.The corresponding values for the alkali-feldspar granite porphyry range from 0.26 to 0.84,-8.0 to-6.1,and 0.79 to 1.08,respectively.Binary mixing modeling indicates that they were originated from the same sources with different proportion,namely,a mixing of 50%to 75%Neoproterozoic crust and 50%to 25%asthenospheric mantle.Together with previous works,we propose that the Early Cretaceous subduction of the ridge between the Pacific and Izanagi plates was responsible for the formation of the aluminous A-type granites in the LYRB.

琼北羊山古村落安全防御特征研究

海口羊山是琼北火山地区的核心区域。当地古村落独特的自然环境、移民文化、社会矛盾、耕读需求,催生了独特的防御文化。该文以羊山四个古村落作为主要研究对象,从地理位置、选址特色、空间格局、院落布局、防御工事等方面来研究物质安全防御;从血缘宗族、村规良俗、宗教信仰等方面来研究文化安全防御,推导并总结了羊山地区古村落安全防御形成原因和防御特征。同时还提出了“遗存保护”“民俗引导”“精华传承”等观点和建议。

阳山金矿安坝矿段农用地土壤重金属污染评价及来源分析

目的:以安坝矿段为例,调查阳山金矿开采前周边农用地土壤重金属As、Cd、Hg、Pb污染情况。方法:采集表层土样80件,垂向土样15件,研究重金属含量变化趋势。运用多种分析方法对表层土壤重金属污染情况进行评价;结合相关性分析及前人地球化学研究成果,分析重金属的来源;结果:As、Cd、Hg、Pb元素平均值分别为陇南市平均值的3.80、1.13、1.12、1.87倍,As分布受人为活动影响最大,属轻度污染;As表现为偏中度累积,Hg和Pb也出现一定的富集,研究区为中等潜在生态危害等级。结论:地表为重金属最集中区,重金属污染可能出现了垂向扩散。As、Hg和Pb主要来源于金矿盗采和平硐建设,也受交通运输的影响,Cd主要来自土壤母质。意义:为后期矿山建设开发提供依据。

景观基因信息链视角下海口羊山地区乡土景观特征研究——以涌潭村为例

海南省海口市羊山地区的传统村落具有典型火山和热带地域特色的乡土景观,随着乡村振兴的全面推进,政治景观逐渐影响羊山地区的乡土景观基因,对于羊山地区乡土景观特征的研究显得尤为迫切。本文基于景观基因信息链理论,构建羊山地区乡土景观基因信息链,以羊山地区传统村落涌潭村为具体案例,从景观基因信息元、点、廊道和网络分析羊山地区乡土景观特征。结果表明:1)景观基因信息元内涵丰富,但传承主体缺位,需着重保护信息元的核心载体,创新传承技术和方式;2)景观基因信息点和廊道数量众多,但保护度较差,新的景观要素挤占生存空间,需加强信息点和廊道的保护;3)景观基因信息网络不断延展,需合理科学规划建筑道路,保持其整体协调性和完整性。未来在恢复羊山地区乡土景观的历史文化记忆、构建景观信息载体时,还应关注乡土景观主体之间紧密联系性的创造,并结合数字化技术等进行保护和修复。

2021—2023年阳山县8~10岁儿童碘营养水平分析

目的:分析2021—2023年阳山县8~10岁儿童的碘营养水平。方法:对2021—2023年阳山县8~10岁儿童的甲状腺检查、尿碘水平及家庭食盐情况进行研究,并对数据进行分析。结果:2021—2023年,阳山县8~10岁儿童的尿碘中位数依次为217.0 μg·L^(-1)、173.6 μg·L^(-1)和221.0 μg·L^(-1)。2022年碘摄入不足的比例为21.50%;而2021年和2023年碘摄入过量比例较高,分别为27.50%和24.00%。本研究中家庭碘盐覆盖率为100.0%(2021年)、99.0%(2022年)和100.0%(2023年)。2022年家庭使用合格碘盐比例最低(98.99%)。2021年和2023年家庭合格碘盐的食用率均为100.0%。在抽样的600名儿童中,均无甲状腺肿。结论:阳山县儿童碘营养状况总体良好,但存在碘摄入过量和不足的问题,需加强碘盐监管和营养教育,以保障儿童健康成长。

直流电法在阳山县岩溶地区找水中的应用

根据场地水文地质和地球物理条件分析判断,在地形条件复杂的岩溶地区,采用以直流中间梯度法为主、直流电测深法为辅的综合物探找水方法,论文对其方法选择及测线布置进行阐述,对测得数据进行处理并进行成果资料解释。研究结果表明,先采用中梯剖面法探测地下岩性变化和含水特性,然后通过电测深法进一步揭示不同深度含水构造分布,显著提高了找水的准确性与效率。

阳山矿区严重漏失垮塌地层钻进工艺及工程实践

严重漏失、垮塌地层快速钻进工艺的研究与应用是当前固体矿产勘查地质岩心钻探亟需解决的问题之一。文章结合甘肃阳山金矿钻探工程实践,针对长孔段的严重漏失、垮塌地层,总结了一套适用于该矿区快速勘探的绳索取心钻进和全面钻进、顶漏钻进工艺,采用水泥临时封堵、套管封堵、扩孔、跟管等方式进行封堵的钻进方法,分析了其应用效果,提出了在该地层钻进的认识与思考,以期为同类型地层钻探提供参考。

Fully automatic container terminals of Shanghai Yangshan Port phase Ⅳ

1 About Shanghai Yangshan Deepwater Port phase Ⅳ Engineering Shanghai Yangshan Deepwater Port phase Ⅳ Engineering(hereinafter referred to as"Yangshan phase Ⅳ"),is located in Hangzhou Bay of Pudong New Area,Shanghai,China.Embanked by the East Sea Bridge in the north,the engineering is in the west most area of Yangshan Deepwater Port and sits on the reclaimed land along the Kezhushan Island-Great Turtle Island-Turtle Island line,covering 2.23×10^6 m^2 in total with a width of around 500 m.

洋山港区四期工程对周边海底地形的影响

围填海工程建设中周边海底地形变化是开展海岸工程开发建设的关键技术问题,有利于海洋环境保护及资源开发利用。本研究根据2010—2020年洋山港区四期工程实测的海底地形资料,分析了该工程施工前(2010年)、施工中(2013年)和施工后(2020年)周边海底地形的变化特征。结果表明:由于外侧海堤线的阻挡作用,洋山港区四期工程西围堤以西海域大部分区域为淤积区;由于堤线的拉直挑流作用,外侧海堤前沿距码头前沿以南350m的范围内主要为冲刷区,距码头前沿以南350m的范围外,为淤积量值较小的淤积区;颗珠山南部海域,除了局部出现冲刷外,大部分区域为淤积区,且淤积量值较大。总体来看,该码头工程对周边海域海底地形影响属于轻微级,施工后周边海底地形影响较小。

甘南阳山金矿床控矿构造的思考

阳山金矿床位于甘肃省陇南市文县境内,其大地构造位置处于西秦岭构造带的玛曲-略阳深大断裂南侧,是西秦岭地区为数有限的大型金矿床之一。该区控矿构造复杂,经过20多年的研究仍然存在很大争议。本文通过对矿区含矿构造的调查结合区域构造环境,重新厘定了含矿构造的特征,并对该矿床控矿构造的相关问题进行了讨论。研究结果显示,阳山金矿床控矿构造是以走向NEE,倾向NNW为主的偏脆性逆冲推覆构造系统,形成于俯冲-碰撞早期的韧性变形之后。含矿构造与千枚岩的千枚理没有直接的关系,可以与千枚理近于平行,或小角度斜交,或大角度斜交,主要以倾向北的断裂为主,少量为主逆冲断层上盘的倾向南的次级反向逆冲断裂,局部为顺千枚理的层间破裂。含矿构造对岩性没有选择性,但是不同岩性岩石的不同力学性质影响了含矿构造的发育与否和发育程度。阳山金矿区进一步工作中值得思考和关注的问题:(1)矿区构造格架上葛条湾-草坪梁复背斜可能不存在,也未起控矿作用;(2)成矿后断裂对矿体空间展布的影响;(3)在勘查编录中对各种构造破碎带需要详细的描述,以明确区分含矿构造与成矿后构造,为构建控矿构造体系准备素材,为进一步找矿预测和勘查工程部署提供技术支撑。

阳山水蜜桃园肥料投入及不同种植年限土壤养分累积现状

阳山水蜜桃为中国国家地理标志产品,土肥科学管理对其产业的可持续发展至关重要。选择4个主要水蜜桃种植镇含不同种植年限的33块桃园为研究对象,通过实地问卷调查结合室内土壤样品分析,以摸清水蜜桃园肥料投入结构,分析桃园土壤养分丰缺状况及生态化学计量特征。结果表明:桃园氮、磷、钾平均总投入量分别为527kg·hm–2(以N计)、362kg·hm^(-2)(以P_(2)O_(5)计)、545 kg·hm^(–2)(以K2O计),以三元复合肥为主的化肥来源占比较大,而菜籽饼、牛粪、鸡粪、秸秆等有机来源的氮、磷、钾分别占投入总量的27.8%、15.4%、15.6%。种植大于10年的桃园0~20cm和20~40cm土层土壤pH均达到了强酸性水平(4.5<pH<5.5)。根据第二次全国土壤普查养分分级标准,桃园土壤有机质、全氮、全磷和全钾含量基本处于3级及以上标准,0~20cm土壤C:N、C:P、N:P随着种植年限的增加不断降低,种植10年以上的桃园土壤碱解氮、有效磷和速效钾含量已经达到了1级水平,桃园土壤硝态氮含量范围在19.3~33.1mg·kg^(–1)。N、P_(2)O_(5)、K_(2)O的当季表观盈余量分别为343 kg·hm^(-2)、238 kg·hm^(-2)、240 kg·hm^(-2)。综上,水蜜桃园连年高养分投入加剧土壤酸化和养分累积,土壤氮磷残留量过高,增加其流失风险,亟需研究并提出减肥增效、减排控失、高产保质的桃园绿色生产模式。

清末辽籍医家景仰山学术贡献

清末民初的名医景仰山因仕途不顺,弃儒从医,一生致力于中医事业,救人无数。在中医理论方面,他勇于探索、革新,横向上其主张中西医合参,以西医解剖学眼光审视并结合中医藏象学,纵向上提倡深度解读中医名词术语,从训诂学、易学、历法学等角度阐释经脉命名来由,以发前人所未述。临床诊疗方面,景仰山采撷宋明理学精华,继承河间学派的学术思想,呼吁重视运导这一未病先防手段,以及在病愈后要审慎调养,不可轻浮恣欲,致使病复。景仰山的临床风格深受家学熏陶,以《伤寒论》为理论渊薮,兼具河间学派的特点,其临证时融汇伤寒温病等学派辨证思路,且善用寒凉,每起沉疴,多有奇效。以其经验具有相当的可借鉴性,故从其著作《景仰山医学三书》出发,对其医学思想作一评析,以期指导临床。