山东省莱芜市北江水地区铜矿床地质特征及找矿方向

北江水铜矿床位于鲁西重要的铜多金属成矿带内,在分析区域成矿地质背景和矿床地质特征的基础上,着重从构造、地层、岩浆岩等方面分析了控矿因素和找矿标志。利用矿区内最新施工的钻孔资料及物化探资料,对区内矿体的成矿规律、分布特征进行了全面、系统的分析,认为矿床成因类型属于中低温热液型,铜矿体呈脉状严格受北江水断裂控制。区内铜矿体赋存岩性为黄铜矿化石英脉,矿体侧伏方向为NW 300°,矿体沿侧伏方向富集明显,且深部未封闭。区内NW向断裂是重要的导矿、控矿构造,受断裂构造控制的热液型铜矿床,一般具有延深大于延长的特点。认为该区具有良好的找矿前景,指出了找矿方向为研究区西北部及矿体深部。     

石门砷矿床一号窿矿体构造研究

通过矿区构造及一号窿矿体构造研究，论述了湖南石门县界牌峪地区砷矿床一号窿矿体构造特征、矿体特征、矿体与断裂构造的成因联系，指出了矿区的导矿构造与容矿构造，提出了本区中生代３期主要构造应力场，强调了矿区内局部应力场与相应方向的优势节理配合是本区砷（金）矿床形成的主要模式     

格尔木市扎日玛日那西铁矿矿床地质特征及找矿前景分析

格尔木市扎日玛日那西铁矿属小型铁多金属矿床,矿区内目前已探测出13条铁矿体和4条锌矿体。通过对矿区内矿床地质特征、矿石特征、磁异常特征、控矿因素等进行研究分析,认为该矿床为矽卡岩型矿床,NW向断裂和接触带是重要的导矿、控矿因素,铁矾帽、磁异常、矽卡岩、颜色为重要的找矿标志,该矿床具有较好的找矿前景。     

青海省都兰县巴隆岩金矿床地质特征及找矿标志

对巴隆岩金矿成矿地质背景、矿体特征、矿石特征及其控矿因素等进行分析研究。认为区内矿体与NWW向断裂关系密切,NWW向昆中主断裂为矿床的导矿构造,NWW向F1断裂为矿床的配矿构造,矿区内F2,F3,F4,F5等NWW向次级断裂为矿床的容矿构造;尤其是在拐弯或膨胀处;强烈的印支期岩浆活动,剧烈的构造运动为金元素的活化、迁移、富集、沉淀提供了通道和成矿空间;矿石类型主要为构造蚀变岩型;重砂矿物标志、地貌标志、颜色标志、气味标志、化探异常标志等是该区的主要找矿标志。结合区域上成矿背景分析认为该矿区有着良好的找矿前景,并建议对矿床深部及外围做进一步工作。     

青海德合龙洼铜金矿地质特征及找矿标志

通过对青海德合龙洼铜金矿的矿区地质特征、矿床地质特征及矿体地质特征分析,研究表明本区矿源层主要为大关山群与隆务河群,容矿控矿构造为断裂构造,岩浆岩主要为花岗岩类侵入岩与脉岩.并在此基础上总结本矿区找矿标志,为今后地质找矿工作提供参考.     

青海省都兰县丘吉东沟银铅矿地质特征及找矿标志

青海省都兰县丘吉东沟银铅矿位于昆中断裂带内,区内断裂构造十分发育,主要为NW向断裂,与区域构造方向基本一致。区内含矿蚀变带与NW向深大断裂关系密切,NW向断裂为区内的主要的导矿、控矿构造,次级构造或构造膨胀部位及构造拐弯处,均为找矿的有利地段,可作为容矿场所。区内华力西期岩浆活动强烈,该期活动为区内岩浆活动的最高潮,是主要成矿期。研究区圈定2个矿带9条银铅矿体,呈脉状或透镜状赋存于蚀变硅质白云岩之NW向构造破碎带F_8,F_9内,是以银为主的多金属矿体。其中I-5矿体为主矿体,平均厚度2.38m,银平均品位216.87×10~(-6),铅平均品位1.98%,主要矿化蚀变为方铅矿化、黄铁矿化、黄钾铁钒化等。本文分析了丘吉东沟银铅矿地质背景、矿床地质特征等,总结了找矿标志,预测了找矿方向,以期为类似地区的银铅找矿工作提供借鉴经验。     

青海省都兰县洪利铅锌矿床地质特征及找矿标志

青海省都兰县洪利铅锌矿床地处华南板块与柴达木盆地南缘的接合部,位于东昆中断裂带内,总体构造线走向为NW-SE向,构造形迹以断裂、褶皱为主,矿区断裂构造发育,按其走向可划分为2组,即NW,NE向断裂。其中NW向断裂为区内主干断裂,略具规模,控矿明显,为区内主要的导、控矿构造,洪利铅锌矿床即受其控制。次为NE向断裂,但规模不大,且对矿体具错断和破坏作用。区内岩浆活动多集中于晋宁期和华力西期,成矿地质条件较好。受后期构造活动影响,造成了该矿床由于矽卡岩化与热液蚀变在空间上的叠加而使其矿化特征的复杂多变。通过详细的野外观察和室内分析共圈出锌多金属矿体2个,磁铁矿体6个,金矿体2个,铁矾帽9个。根据围岩蚀变、矿体走向、分布特征及其与岩性、构造的关系,可分为南、北2个矿段,初步划分了Ⅰ,Ⅱ,Ⅲ条矿化带。研究认为铁矾帽、磁异常、地球化学、矽卡岩化、热液蚀变及角岩化是该区的主要找矿标志,其中铁矾帽系该矿区找矿的直接标志。     

河南省崤山地区葫芦峪大方山金矿床地质特征及找矿远景

通过对区内成矿地质背景及矿床特征的分析,阐述了本区位于华北地台南缘,秦岭构造带北侧与太行山新华夏系隆起南延部分之复合部位;矿体主要产于太古宇太华群斜长角闪片麻岩、片岩地层中;区内岩浆活动强烈、断裂发育、矿化明显,充分证明了该区成矿条件良好,找矿远景乐观.     

山东五莲七宝山铜及多金属矿床成矿地质特征及找矿方向

在对区域成矿地质条件和矿区地质特征认识的基础上,着重研究了七宝山铜及多金属矿床特征,认为矿床的成因属于沿断裂构造充填的中-低温次火山热液矿床.控矿因素主要是断裂构造、岩性、地层,简要分析了该区的找矿标志主要为断裂交汇部位、构造破碎带及其火山岩体等.同时分析了该区的找矿方向,指出了五莲七宝山、南官庄、李家坡3个找矿预测区的潜力,为下一步的找矿工作提供了依据.     

广西武宣县盘龙铅锌矿地质特征及找矿方向

武宣县盘龙铅锌矿位于大瑶山西侧铅锌多金属成矿带南段,产于下泥盆统上伦白云岩层间破碎带中,是广西近年来初步探明的重要铅锌矿床之一。文章在分析研究矿床地质背景、构造特征、矿石矿物特征及围岩蚀变特征的基础上,指出该矿床属沉积—热液改造型铅锌矿,找矿标志主要是层位岩性、构造、围岩蚀变、民采遗迹标志,找矿方向主要为已初步控制矿体的NE及SW段及物探异常和堆积重晶石、铁锰帽分布范围。     

A new species of the genus Haloschizopera Lang, 1944(Copepoda,Harpacticoida, Miraciidae,Diosaccinae) from the East China Sea

A new species belonging to the genus Haloschizopera Lang,1944(Copepoda,Harpacticoida,Miraciidae,Diosaccinae)was identified based on the samples collected from the East China Sea,near the offshore of Zhejiang Province,East China.The new species is closely related to H.pygmaea Norman Sccot T.,1905 and shares a combination of the following features:A1 eight-segmented;A2 exp-2 with one distal seta,exp-3 with three setae;P1 endopodal segments subequal,enp-1 not exceeding exp-2;exp-3 of P3 with one inner seta,of P4 with two inner setae.The new species is characterized by the presence of one inner seta on P2 exp-3 of both sexes.It can also be distinguished from its congeners by the characters of female:P5 exopod subcircular,endopodal lobe extending beyond half-length of exopod;genital doublesomite ornamented with three dorsolateral rows of spinules on anterior part.     

法律化·社会化·程序化:人民监督员制度发展前瞻

法治是合法性和合理性的有机统一。作为一项推进依法治国的措施,人民监督员制度只有通过制度的法律化获得存在的合法性,通过组织的社会化获得运行的合理性,通过机制的程序化实现法律化与社会化的现实统一,才能充分符合法治精神,具备监督资格和能力,进而发挥监督实效。     

Petrography,geochemistry and provenance of the sediments of the Early Cretaceous Yanguoxia Formation,Lanzhou-Minhe Basin,Northwest China

Lanzhou-Minhe Basin is situated on the middle Qilian orogenic belt. Yanguoxia Formation contains abundance of maroon siltstones, mudstones and red sandstones of the lake facies. These sedimentary rocks recorded the process of the tectonic uplift of Qilian Mountains during the Early Cretaceous. We discovered plentiful dinosaur footprints, worm burrows, bird footprints, worm tracks-trails, ripple marks and cross lamination in the Yanguoxia site. Integrated petrographic studies classified sandstones of Yanguoxia Formation as feldspathic litharenite. All plots in the QFL (Q or Qt, total quartz; F, feldspar; L, lithic grains) and QmFLt (Qm, monocrystalline quartz; Lt, lithic grains plus polycrystalline quartz) diagrams fall in the recycled orogen provenance field and quartzose recycled field, respectively, implying the source occurred the tectonic activity. Furthermore, geochemical study indicates that the Yanguoxia standstone was formed in an unstable continental setting due to the northwards movement of Indian Plate triggered the collision between the Qilian fold belt and the Qinling fold belt. These sediments were derived from a mixed source and then deposited in the Lanzhou-Minhe Basin. Most of the felsic components were derived from the granitoid rocks of the Qilian Mountains due to the rapid and intense uplift during the Early Cretaceous while the mafic components were contributed by the basic and ultrabasic rocks of the rapidly rising ophiolite in the Qilian Mountain area. Bivariant log-log plot of Qp/(F+L) (Qp, polycrystalline quartz) against Q/(F+L) shows that Yanguoxia Formation was deposited in the semi-humid and semi-arid. Moreover, the pollen also exhibits that the environmental condition during the deposition of Yanguoxia Formation was warm and wet, which affirm such environment was benefit to dinosaur survival. Geochemical study also infers that the Yanguoxia Formation was deposited under the oxidizing condition in a shallow marine environment. The minerals identified from the X-ray diffraction (XRD) analysis of shale and siltstone samples are 4.74%-33.53% clays, 23.45%-4l.70% carbonates and 33.99%-71.81% quartz, respectively, which infer that depositional conditions remained uniform during the formation of shales or siltstones of Yanguoxia Formation.     

东营凹陷博兴洼陷深洼区古近系沙河街组三段中亚段沉积特征

利用岩心、测井、录井、地震等资料,应用层序地层学与沉积学理论,建立博兴洼陷深洼区古近系沙河街组三段中亚段层序地层格架,识别沉积相类型,揭示研究区沙河街组三段中亚段湖底扇砂体的充填期次和规律.结果表明:沙河街组三段中亚段地层划分为2个三级层序,层序内部细分为6个体系域;识别湖底扇中扇、湖底扇外扇、深湖3种沉积亚相,以及辫状水道、水道间、席状浊积岩、远源浊积岩和深湖泥5种沉积微相;总结各沉积微相在岩心、测井、地震上的识别特征;在层序格架内识别各体系域沉积相平面展布规律.此研究对该区下一步油气资源的勘探开发具有指导意义.     

Growth,reproduction & population structure of the freshwater crabSinopotamon yangtsekiense bott, 1967, from Zhejiang,China

Monthly investigations were mae on the population of Chinese freshwater crab,Sinopotamon yangtsekiense Bott, 1967 from April, 1984 to March, 1985. The data on 4413 specimens show that the growth was affected mainly by temperature. During the April to November growth period, the crabs' major development occurred from June through October. One year was required for a fine white oocyte to develop into a mature egg. The reproduction period was June–October. Females bearing eggs were taken from June–August, and crabs with young were found from July–October. The females reproduced once a year but could for more than one year. The number of eggs carried by a female varied greatly according to the size of the crab, ranging from 30 to 100 eggs. New-born crabs become mature after 1–2 years. The sex ratio was approximately 1∶1 in the overall population. However, the larger crabs are predominantly male. The age distribution ofS. yangtsekinese was estimated from size frequency histograms. There were more adult crabs (over 70%) from June to October and more immature crabs (over 50%) from November to May.     

Recent climate trends on the northern slopes of the Tianshan Mountains, Xinjiang, China

In arid regions, mountains fulfill important ecological and economic functions for the surrounding lowlands. In the scenario of global warming, mountain ecosystems change rapidly, especially in the arid region of northwestern China. This paper provides an assessment of the changes in temperature and precipitation in the historical records of climate on the northern slopes of the eastern Tianshan Mountains. A Mann-Kendall nonparametric trend and Sen＇s tests are employed to analyze the interannual changes and innerannual variability in temperature and precipitatiofi in the regions of low to high altitude. The present study finds that the largest increases in annual temperature are observed at stations in the low altitude regions. The significant increasing trends in temperature tend to occur mainly in late winter and early spring at stations from middle to high altitude, but in summer and autumn at stations of low altitudes. The increasing trends in annual precipitation are found from the middle to high altitude areas, but decreasing trends are found in the low altitude areas. The significant increasing trends in precipitation occur mostly in winter and earlier spring at stations from the middle to high altitudes, while the increasing and decreasing trend coexists at stations of low altitude with most of the significant trend changes occurring in March, June and August.     

An Overview of the Geoenvironmental Status of the Kullu Valley, Himachal Pradesh, India

The north-south trending Kullu valley between Rohtang in the north and Hansu in the south is a wide and open valley filled with Quaternary sediments along the main course of the Beas River. The valley in the middle is drained by the Beas River and numerous tributaries join it laterally. The tributary channels have deposited large alluvial fans at their mouths which form three distinct levels. The Beas River has deposited alluvial terraces, which are very distinct towards the lower reaches and form three to four levels. The upper slopes and high altitudinal areas are covered with periglacial and glacial deposits. The terrace, fan and hill slopes have provided an ideal geoenvironment for human activities including agriculture, horticulture, dense settlements and other civil establishments. The Kullu Valley is prone to various natural hazards, flash floods and cloudbursts that are very common in this valley due to its peculiar geomorphic condition, high relief of peripheral ridges and impact of monsoon winds. The studies carried out so far indicate that the losses caused by these phenomena both in terms of life and property are mainly due to unwise human interaction with the geoenvironment of the area. The paper gives an overview of the geoenvironmental status of the Kullu Valley and suggests the necessity of undertaking further detailed studies including resource mapping for balanced development of the area.     

加强目标观测,服务防灾减灾

以深入浅出的方式介绍了目标观测的定义、历史、确定目标观测敏感区的方法,以及实施目标观测与防灾减灾的关系;并以欧洲中期天气预报中心目标观测业务化为例,简明地概括了目标观测的实施过程;结合国内目标观测研究现状,对中国目标观测的未来提出了看法。     

Two new species of the genusDorylaimopsis Ditlevsen, 1918 (Nematoda: Adenophora,Comesomatidae) from the Bohai Sea,China

Two nematode species of the genusDorylaimopsis (Family Comesometidae) from the Bohai Sea are described.Dorylaimopsis rabalaisi n. sp. similar toD. punctata Ditlevsen, 1918 from which it can be separated by the small size, short and simple spicules without ventral apophyses or joint line.Dorylaimopsis turneri n. sp. differs from the closest speciesDorylaimopsis angelae (Inglis, 1967) by its higher values of de Man ratio ‘a’, much shorter spicules and higher ratio of gubernacular to spicules length. A key to species of the genus based on the key by Jensen (1979) is given. This project was supported by the National Science Foundation, No: 3860804     

Phylogenetic,evolutionary, and biogeographic origin of the genus Sheathia (Batrachospermales,Rhodophyta)

Journal of Oceanology and Limnology - The genus Sheathia consists of over 20 species primarily distributed in Asia, Europe, Oceania, North America, and Africa. However, the origin and evolution of...