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Watershed-level Rainfall Erosivity Mapping Using GIS-based Geostatistical Modeling 基于gis的流域降雨侵蚀力制图
Pub Date : 2017-12-31 DOI: 10.18005/JESR0501002
H. Fathizad, M. A. Hakimzadeh, S. R. F. Shamsi, S. Yaghobi
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引用次数: 2
Geochemical and Geodynamic Constrain of Tholeiitic Volcanism and Related Intrusions in the Kampti Gold District, Southwest Burkina Faso: Implication for Mineral Exploration 布基纳法索西南部Kampti金矿区拉斑火山岩及相关岩体的地球化学和地球动力学约束:对矿产找矿的启示
Pub Date : 2017-12-30 DOI: 10.5539/ESR.V7N1P76
Mathieu Nanema, U. Wenmenga, Hermann Ilboudo
The Kampti serie is a volcano-plutonic complex in the south-eastern corner of the Hounde belt, closed to the border with Ivory Coast. The stratigraphy comprises initially: a thick sequence of tholeiitic and pillowed basalt followed by pyroclastic projections derivated from bimodal volcanism; and flowing mostly to the south. The volcanic sequence is cross-cut by mafic cumulate body, stocks of gabbro, diorite, subvolcanic dykes and lately intrude by granitoid. It is bordered to the west by the pelitic schist of the Bambela basin with minor intercalation of Tarkwa type sediment. volcanoclastic facies is dominantly plagioclase-phyric (albite +/- oligoclase), zoned plagioclase has a core of anorthoclase. Secondary mineral infilled (quartz, kutnahorite, ripidolite, clinozoisite) of spherulites and oolite highlight a general low grade metamorphism of greenschist facies affecting the complex. Based on trace element chemistry, the tholeiitic rocks present flat REE pattern contrasting with the felsic rocks more enriched in LREE and depleted in HREE. The style of the magmatism in the Kampti serie is compatible with an island arc model, describe elsewhere in the birimian. Gold mineralisation and base metal occurrences associated to the nature of rocks and tectonics highlight a polymetallic district.
Kampti系列是霍德带东南角的一个火山-深成复合体,靠近科特迪瓦边境。地层最初包括:拉斑岩和枕状玄武岩的厚层序,其次是双峰火山作用形成的火山碎屑投影;而且主要流向南方。火山层序被基性堆积体、辉长岩、闪长岩、次火山岩脉和花岗岩类侵入所交叉切割。西邻班贝拉盆地的泥质片岩,间或有塔克瓦型沉积。火山碎屑相以斜长石-辉长石(钠长石+/-寡长石)为主,分带斜长石以斜长石为核。球粒岩和鲕粒岩充填的次生矿物(石英、库纳辉石、榴辉石、斜沸石)突出了绿片岩相的普遍低变质作用。微量元素化学分析表明,拉斑岩呈现出较平坦的稀土模式,而长英质岩则表现出轻稀土富集、重稀土亏缺的特征。Kampti系列岩浆活动的风格与brimian其他地方描述的岛弧模式相容。金矿化和与岩石性质和构造有关的贱金属赋存突出了多金属区。
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引用次数: 0
Textural and Petrographic Characterization of the Soil of Amtiman (South-East Chad) 乍得东南部Amtiman地区土壤的结构和岩石学特征
Pub Date : 2017-11-25 DOI: 10.5539/ESR.V7N1P67
A. Zagalo, M. Kwékam, F. Ngapgue, Idriss Goudja Tchere
The textural and petrographic characteristics of the soils of the city of Amtiman and their behavior on swelling and shrinkage are presented here.The soils of the town of Amtiman (Chad) have a predominantly clay texture and the clays are mainly exposed on the surface. The results of this work include characterizing the type of clay present in the city. These are the heterogeneous layers of clayey soils consisting mainly of surface-bound illites but also of kaolinite intercalation at depth.These results suggest that the phenomenon of shrinkage of the clays (Illite and kaolinite) of the city of Amtiman is very low and that this city belongs to the sedimentary basin of Salamat.
本文介绍了阿姆提曼市土壤的质地、岩石特征及其胀缩特性。乍得Amtiman镇的土壤主要是粘土质地,粘土主要暴露在表面。这项工作的结果包括表征城市中存在的粘土类型。这些是不均匀的粘土层,主要由表面的伊利石组成,但也有深层的高岭石嵌层。这些结果表明,阿姆提曼市粘土(伊利石和高岭石)的收缩现象非常低,该城市属于萨拉马特沉积盆地。
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引用次数: 0
Seasonal Variations of Groundwater Chemistry in the Basement and Sedimentary Rocks of Ibadan and Lagos Areas, Southwestern Nigeria 尼日利亚西南部伊巴丹和拉各斯地区基底和沉积岩地下水化学的季节变化
Pub Date : 2017-10-21 DOI: 10.5539/ESR.V7N1P55
A. Bolarinwa
Hydrochemical investigation of forty boreholes drilled on the basement and sedimentary rocks in Ibadan and Lagos metropolis southwestern Nigeria respectively were carried out in order to determine the portability of the groundwater in both areas and to highlight differences in their chemical characters and variations with seasons. Data obtained indicated that the groundwater in Ibadan area is mainly the Na + Ca – HCO ­­ 3 type, while that of Lagos is Na + Ca – C1 + SO 4 type. The groundwater chemistry reflects weathering of sodic plagioclase feldspars in the basement rocks as well as arkosic sandstone in the sedimentary terrain. The higher chloride (ca. 124.2 mg/L) content of the Lagos water is probably due to salt-water intrusion along the coastal area. Elevated Na + (58.5-1021.2), Fe 2+ (0.3-2.8) and Mn 2+ (0.04-2.34) mg/L concentrations, particularly during the dry season, adversely affect the portability of the water from both localities. Apart from making the water unsuitable for irrigation, high Na + content is considered harmful to persons suffering from cardiac, renal and circulatory diseases. The Fe 2+ and Mn 2+ contents could also create staining problem. It is therefore desirable to remove these elements from the borehole water prior to consumption.
为了确定这两个地区地下水的可携性,并突出其化学特征的差异和随季节的变化,分别在尼日利亚西南部的伊巴丹和拉各斯两个大都市的基底和沉积岩上钻了40个钻孔进行了水化学调查。数据表明,伊巴丹地区地下水以Na + Ca - HCO—3型为主,拉各斯地区地下水以Na + Ca - C1 + so4型为主。地下水化学反映了基底岩石中钠斜长石的风化作用以及沉积地形中的黑砂岩的风化作用。拉各斯水中较高的氯化物含量(约124.2毫克/升)可能是由于沿海地区的盐水入侵。Na +(58.5-1021.2)、Fe 2+(0.3-2.8)和Mn 2+ (0.04-2.34) mg/L浓度的升高,特别是在旱季,对两地的水的可携性产生不利影响。除了使水不适合灌溉外,高Na +含量被认为对患有心脏、肾脏和循环系统疾病的人有害。Fe 2+和Mn 2+的含量也会造成染色问题。因此,最好在使用之前将这些元素从钻孔水中去除。
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引用次数: 1
Facies Analysis and Sequence Stratigraphy of Missole Outcrops: N’Kapa Formation of the South-Eastern Edge of Douala Sub-Basin (Cameroon) 喀麦隆杜阿拉次盆地东南缘N’kapa组Missole露头相分析及层序地层学
Pub Date : 2017-10-21 DOI: 10.5539/ESR.V7N1P35
Paul Gustave Fowé Kwetche, M. Ntamak-Nida, Adrien Lamire Djomeni Nitcheu, J. Etamé, F. Owono, Cécile Olive Mbesse, Joseph Bertrand Iboum Kissaaka, Gilbert François Ngon Ngon, S. Bourquin, P. Bilong
Missole facies description and sequence stratigraphy analysis allow a new proposal of depositional environments of the Douala sub-basin eastern part. The sediments of Missole outcrops (N’kapa Formation) correspond to fluvial/tidal channel to shallow shelf deposits with in some place embayment deposits within a warm and semi-arid climate. Integrated sedimentologic, palynologic and mineralogical data document a comprehensive sequence stratigraphy of this part of the Douala sub-basin. Five facies associations occur: (1) facies association I is characterized by Floodplain deposits; (2) facies association II is Fluvial to mouth bar deposits; (3) facies association III characterise Shallow Shelf deposits; (4) facies association IV represents Distal bay or Lacustrine deposits; and (5) Facies association V is made of Fluvial channel deposits. Six depositional sequences were identified. These sequences are composed of four progradational sequences and two retrogradational sequences containing a fluvial channel portion represented by lag deposits at the base of retrogradational sequences. These deposits represent the outset of the relative sea level rise period. In the study area, the N’kapa Formation is composed of non-marine/coastal aggradational deposits representing the early stage of the regressive period. The occurrence of the estuarine/bay deposits with paleosols development is interpreted as evidence of climate change with significant relative base level fluctuation. The study of key minerals associated to sequence stratigraphy as well as palynology demonstrated that sequence architecture has been controlled mostly by climate evolution and outcrops are dated Paleocene – early Eocene.
Missole相描述和层序地层学分析为杜阿拉次盆地东部沉积环境提供了新的思路。Missole露头(N’kapa组)的沉积物对应于河流/潮汐通道到浅陆架沉积物,在温暖的半干旱气候下,某些地方有河口沉积物。综合沉积学、孢粉学和矿物学资料,对杜阿拉次盆地这部分进行了全面的层序地层学研究。发生5种相组合:(1)相组合ⅰ以漫滩沉积为特征;(2)相组合II为河流-河口坝沉积;(3)相组合III是浅陆棚沉积的特征;(4)相组合IV代表远端海湾或湖相沉积;(5)相组合V为河道沉积。确定了6个沉积层序。这些层序由4个进积层序和2个退积层序组成,在退积层序的底部有以滞后沉积为代表的河道部分。这些沉积物代表了相对海平面上升时期的开始。研究区N’kapa组由非海相/海岸沉积组成,代表了早期的海退期。古土壤发育的河口/海湾沉积物的出现被解释为气候变化的证据,具有显著的相对基准面波动。层序地层学和孢粉学研究表明,层序结构主要受气候演化控制,出露时间为古新世-始新世早期。
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引用次数: 11
Petrography and Geochemistry of the Banded Iron Formation of the Gangfelum Area, Northeastern Nigeria 尼日利亚东北部Gangfelum地区带状铁组岩石学和地球化学研究
Pub Date : 2017-10-05 DOI: 10.5539/ESR.V7N1P25
A. Bolarinwa
The Gangfelum Banded Iron Formation (BIF) is located within the basement complex of northeastern Nigeria. It is characterized by alternate bands of iron oxide and quartz. Petrographic studies show that the BIF consist mainly of hematite, goethite subordinate magnetite and accessory minerals including rutile, apatite, tourmaline and zircon. Chemical data from inductively coupled plasma optical emission spectrometer (ICP-OES) and inductively coupled plasma mass spectrometer (ICP-MS) show that average Fe2O3(t) is 53.91 wt.%. The average values of Al2O3 and CaO are 1.41 and 0.05 wt.% respectively, TiO2 and MnO are less than 0.5 wt. % each. The data suggested that the BIF is the oxide facies type. Trace element concentrations of Ba (67-332 ppm), Ni (28-35 ppm), Sr (13-55 ppm) and Zr (16-25 ppm) in the Gangfelum BIF are low and similar to the Maru and Muro BIF in northern Nigeria and also the Algoma iron formation from North America, the Orissa iron oxide facies of India and the Itabirite from Minas Gerais in Brazil. The evolution of the Gangfelum BIF involved metamorphism of chemically precipitated or rhythmically deposited iron-rich sediments into hematite-quartz rocks. The banding of the BIF suggested a break in iron precipitation probably due to iron oxide deficiency.
Gangfelum带状铁组(BIF)位于尼日利亚东北部的基底复合体内。它的特点是氧化铁和石英的交替带。岩石学研究表明,BIF主要由赤铁矿、针铁矿、次级磁铁矿和金红石、磷灰石、电气石、锆石等副矿物组成。电感耦合等离子体光学发射光谱仪(ICP-OES)和电感耦合等离子体质谱仪(ICP-MS)的化学数据表明,Fe2O3(t)平均为53.91 wt.%。Al2O3和CaO的平均值分别为1.41%和0.05 wt.%, TiO2和MnO的平均值均小于0.5 wt.%。数据表明,BIF为氧化相类型。Gangfelum BIF中Ba (67-332 ppm)、Ni (28-35 ppm)、Sr (13-55 ppm)和Zr (16-25 ppm)的微量元素浓度较低,与尼日利亚北部的Maru和Muro BIF以及北美的Algoma铁组、印度的Orissa氧化铁相和巴西Minas Gerais的Itabirite相似。Gangfelum BIF的演化涉及化学沉淀或节律沉积富铁沉积物向赤铁矿石英岩的变质作用。BIF的带状显示铁沉淀中断可能是由于氧化铁缺乏。
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引用次数: 2
Petrographic Investigation of Target Rock Transformation under High Shock Pressures from the Colônia Impact Crater, Brazil 巴西Colônia撞击坑高冲击压力下靶岩转化的岩石学研究
Pub Date : 2017-09-24 DOI: 10.5539/ESR.V7N1P13
V. Velázquez, R. F. Lucena, J. M. A. Sobrinho, A. M. Sallun, W. S. Filho
The Colonia impact crater, developed on crystalline basement rocks, offers an excellent example of one of the most unique features of the impact process: the effects of shock waves on textural and mineralogical changes of the target rock. The impact melt-bearing impactites were derived essentially from the igneous and metamorphic rocks, including granite, mica schist, granitic gneiss, and quartzite. Investigations using optical microscopy indicate that the effect of shock waves on those lithologies caused a wide variety of deformation features and generation of new materials. The most common features include fluidal textures, unusual rearrangement patterns between grains, recrystallization, decomposition and precipitation of new phases, agglutination of glassy and crystalline spherules, and the mobilized melt formed different types of impact melt particles. These transformations cover processes that may involve a new grain growing at the expense of parental grains of the same species, or crystallization of different mineral types from component-providing grains until a complete textural and compositional change of the target rocks occurs. Small-scale structures in deformed rocks are particularly interesting for exploring elastic-plastic deformation, phase transformations, and generation of impact melt products.
科洛尼亚陨石坑是在结晶基岩上形成的,它提供了一个很好的例子,说明了撞击过程中最独特的特征之一:冲击波对目标岩石的结构和矿物学变化的影响。含熔体的冲击岩主要来自火成岩和变质岩,包括花岗岩、云母片岩、花岗质片麻岩和石英岩。利用光学显微镜的研究表明,冲击波对这些岩性的影响导致了各种各样的变形特征和新材料的产生。最常见的特征包括流体织构、晶粒之间不寻常的重排模式、再结晶、新相的分解和析出、玻璃状和结晶小球的凝集,以及被动员的熔体形成不同类型的冲击熔体颗粒。这些转变过程可能包括以牺牲同一物种的母粒为代价生长出新的颗粒,或者从提供成分的颗粒中产生不同矿物类型的结晶,直到目标岩石的结构和成分发生完全变化。变形岩石中的小尺度结构对于探索弹塑性变形、相变和碰撞熔体产物的产生特别有趣。
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引用次数: 5
Mineralogical and Geochemical Appraisal of Clay Deposits in Papalanto and Its Environs, Southwestern, Nigeria 尼日利亚西南部帕帕兰托及其周边地区粘土矿床的矿物学和地球化学评价
Pub Date : 2017-08-22 DOI: 10.5539/ESR.V7N1P1
A. J. Adeola, Modupe Adefunmi Olaleye
Three residual clay occurrences in Papalanto, Ifo, and Imoto areas which belong to the sedimentary basin of southwestern Nigeria were investigated to determine their industrial applications.The samples were pulverized, sieved, digested with mineral acids and characterized. Clay mineralogy was determined using X-ray Diffraction (XRD). Elemental compositions of the clay samples were determined using Inductively Coupled Plasma-Mass Spectrometer (ICP-MS). Grain size distribution data were obtained by conducting grain size analysis in two parts; sieve analysis and sedimentation. Thermal properties, plasticity tests, density measurement, linear shrinkage and water absorption capacity were determined to evaluate their industrial potentials. Chemical Index of Alteration (CIA) was calculated to determine the degree of weathering in the area.The X-ray diffraction results showed that kaolinite is the dominant mineral, while quartz, anatase and hematite are the major non clay minerals. Chemical data showed that the average values of SiO2, Al2O3, and Fe2O3were 59.46%, 22.16%, and 3.06% respectively constituting 98.3% of the bulk compositions. Papalanto possessed high plasticity and mouldability.Evaluation of the clay thermal characteristics, firing colour, water absorption capacities and shrinkage values showed that the whitish Ifo clay and Papalanto kaolinitic clays could serve as raw materials for ceramics, building bricks, and other structural wares. Kaolin which is the dominant mineral in all the clays can be used for cosmetics, tooth paste, pharmaceutical purposes
研究了尼日利亚西南部沉积盆地帕帕兰托、伊福和伊莫托地区3个残余粘土产状,确定了它们的工业应用价值。样品粉碎,筛分,用无机酸消化和表征。用x射线衍射(XRD)测定了粘土矿物。采用电感耦合等离子体质谱仪(ICP-MS)测定了粘土样品的元素组成。通过两部分粒度分析得到粒度分布数据;筛析和沉淀。通过热性能、塑性测试、密度测试、线收缩率和吸水率来评估其工业潜力。计算化学蚀变指数(Chemical Index of蚀变)来确定该地区的风化程度。x射线衍射结果表明,高岭石为主要矿物,石英、锐钛矿和赤铁矿为主要非粘土矿物。化学数据表明,SiO2、Al2O3和fe2o3的平均值分别为59.46%、22.16%和3.06%,占整体成分的98.3%。帕帕兰托具有很高的可塑性和模塑性。粘土的热特性、烧成色、吸水能力和收缩率的评价表明,白色的Ifo粘土和Papalanto高岭石粘土可以作为陶瓷、建筑砖和其他结构制品的原料。高岭土是所有粘土中的主要矿物,可用于化妆品,牙膏,制药等用途
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引用次数: 2
Water Transfer by Tangential Line Method - A Suggestion to Solve All Kinds of Water Related Problems in the World 切线法调水——解决世界上各种水问题的建议
Pub Date : 2017-07-31 DOI: 10.5539/esr.v6n2p149
T. Mohan
I would like to extend my idea in this article to over come the first and foremost need of lives which till now exists in the planet earth and no authenticated news of availability in any other planet -WATER and its Conservation. From the water rich sources, we can transfer the water from one place to another without using electricity. This is possible by fixing the pipe lines parallel to the tangential line of the Earth Circle.
我想在这篇文章中扩展我的想法,以克服生命的首要需求,这种需求到目前为止存在于地球上,在任何其他星球上都没有可靠的可用性消息-水及其保护。从水资源丰富的地方,我们可以把水从一个地方转移到另一个地方,而不使用电力。这可以通过将管道与地球圆周的切线平行来实现。
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引用次数: 0
Announcement of Retraction 撤回声明
Pub Date : 2017-07-28 DOI: 10.5539/esr.v6n2p138
Ibukunoluwa S. Adeola, J. Buckman, G. D. Couples, A. J. Adeola
The editorial board announced this article has been retracted on September 5, 2017.If you have any further question, please contact us at: esr@ccsenet.org
编辑委员会于2017年9月5日宣布撤回本文。如果您有任何问题,请联系我们:esr@ccsenet.org
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引用次数: 0
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