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Stratigraphic Status of the Bama Beach Ridge and the Chad Formation in the Bornu Sub-Basin, Nigeria 尼日利亚Bornu次盆地巴马滩脊和乍得组地层状况
Pub Date : 2015-05-21 DOI: 10.4172/2329-6755.1000192
Zarma Aa, A. Tukur
This work employed heavy mineral and micropalaeontological procedures to distinguish the Bama Beach Ridge from the Chad Formation in the Bornu sub-basin, Nigeria. Heavy mineral studies show the Bama Ridge samples as consisting of well diversified suite of both opaque and non opaque heavy minerals. These include Haematite, Magnetite, Leucoxene and Ilmenite on one hand and Zircon, tourmaline and rutile on the other. The Chad Formation, however, yielded only four species namely: zircon, rutile, apatite and sphene. Micropalaeontological analyses of several silty clay samples of the Bama Ridge yielded the ostracod species of Eucypris sp., Cypridopsis sp. and Darwinula sp. The Chad Formation samples are found to be effectively devoid of microfossil species. It is thus implied that the Bama Beach Ridge is a separate stratigraphic entity from the Quaternary Chad Formation in the Bornu sub-basin.
这项工作采用了重矿物和微古生物学方法来区分尼日利亚博尔努亚盆地的巴马海滩岭和乍得组。重矿物研究表明,巴马岭样品由多种不透明和非不透明重矿物组成。其中包括赤铁矿、磁铁矿、亮绿石和钛铁矿,以及锆石、电气石和金红石。而乍得组只发现了四种,即锆石、金红石、磷灰石和榍石。对巴马岭粉质粘土样品进行微古生物学分析,发现了Eucypris sp.、Cypridopsis sp.和Darwinula sp.等介形虫物种,而乍得组样品则缺乏微化石物种。这表明巴马滩脊与博尔努次盆地第四纪乍得组是一个独立的地层实体。
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引用次数: 1
Seismic Hazard Analysis of Pakistan 巴基斯坦地震灾害分析
Pub Date : 2014-12-05 DOI: 10.4172/2329-6755.1000190
M. Sultan
The main objective of the study is to assess the seismic hazard of different areas of Pakistan in order to ensure earthquake safety of existing and new structures. Try to, describe the Seismicity of Pakistan, carry out Seismic Hazard Assessment of the region and compute Ground Motion of the geographical regions of Pakistan. I have used the PSHA approach of McGuire is adopted to compute the ground motion. Due to collision of Indian plat and Eurasian plate, active faults systems exist in Pakistan. Due to these fault systems, earthquake ground motion analyses are needed to review the Seismic Hazards of the region. For this purpose, GSHAP data is used to map Seismic Hazard of Pakistan. The Scheme of Study follows the Mapping of Seismo-tectonic from Earthquake Catalogue, Earthquake Source delineation Map, and Ground Motion Map from GSHAP data.
本研究的主要目的是评估巴基斯坦不同地区的地震危险性,以确保现有和新结构的地震安全。试图描述巴基斯坦的地震活动性,开展该地区的地震危险性评估,计算巴基斯坦地理区域的地震动。我采用了McGuire的PSHA方法来计算地震动。由于印度板块与欧亚板块的碰撞,巴基斯坦境内存在活动断裂体系。由于这些断层系统,需要进行地震地震动分析,以审查该地区的地震危险性。为此,使用GSHAP数据绘制巴基斯坦地震危险度图。研究方案遵循《地震目录》中的地震构造图、震源圈定图和GSHAP数据中的地动图。
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引用次数: 10
Petrology and Geochemistry of Granitoids of the Northern Part of Adamawa Massif, N.E Nigeria 尼日利亚东北部阿达马瓦地块北部花岗岩的岩石学和地球化学
Pub Date : 2014-11-03 DOI: 10.4172/2329-6755.1000177
Ismaila Vela Haruna
The granitoids of the northern part of Adamawa Massif in northeastern Nigeria have been differentiated based on field and petrochemical data into the granodiorite and granites. Although there are slight mineralogical and geochemical differences between the granodiorite and the granites (e.g. Rb/Sr ratios lower in granodiorite than the granites), the two rock units have similar geochemical characteristics. The rocks are characterized by a wide range in SiO2, Calc-alkaline affinity, syn- to within-plate granite signatures, metaluminous to peraluminous composition and more K2O-rich and hypersthenes-poor comparable to fractionated I-type granitoids. The rocks display slightly fractionated to fractionated LREE, almost flat HREE patterns, with significant negative EU and Ba anomalies, Linear major element trends and progressive rise in SiO2, K2O, Rb and Rb/Sr ratios with depleting MgO, Fe2O3, CaO, TiO2, Sr and Ba consistent with removal of plagioclase during fractionation of basic melts to yield silicic magma. This linear trend is reflected in the normative mineralogy where orthoclase and quartz increase from granodiorite to the granites whereas other minerals behave in a reverse manner. Based on field and petrochemical features, the granodiorites and the granites of south Adamawa Massif are I-type, generated in a syn- to within-plate collision-related tectonic setting and genetically related to a common source by fractional crystallization dominated by the removal from the melt hornblende, plagioclase, biotite, K-feldspar and accessory phases such as apatie, epidote and zircon.
根据野外和石油化学资料,将尼日利亚东北部阿达马瓦地块北部的花岗岩类划分为花岗闪长岩和花岗岩。虽然花岗闪长岩与花岗岩在矿物学和地球化学上存在细微差异(花岗闪长岩Rb/Sr比值低于花岗岩),但两者岩石单元具有相似的地球化学特征。岩石具有SiO2、钙碱性亲和、同—板内花岗岩特征、铝质—过铝质组成、富钾和贫钾特征,可与分选的i型花岗岩相比较。主要元素呈线性趋势,SiO2、K2O、Rb和Rb/Sr比值逐渐升高,MgO、Fe2O3、CaO、TiO2、Sr和Ba的消耗与基性熔体分馏产生硅质岩浆过程中斜长石的去除一致。这种线性趋势反映在规范矿物学中,正长石和石英由花岗闪长岩向花岗岩增加,而其他矿物则相反。根据野外和石油化学特征,南阿达马瓦地块的花岗闪长岩和花岗岩为i型,形成于同—板内碰撞构造环境,以熔融角闪石、斜长石、黑云母、钾长石和磷灰石、绿帘石、锆石等附属相的分离结晶作用为主导,其成因与同一源区有关。
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引用次数: 3
Characterisation of Eluvial Corundum (Ruby) from Kermunda, Kalahandi District, Odisha, India 印度奥里萨邦Kalahandi地区Kermunda残积刚玉(红宝石)的特征
Pub Date : 2014-10-29 DOI: 10.4172/2329-6755.1000180
D. Sk, Mohanty Jk
Corundum and ruby occur sporadically in the soil horizons around Kermunda area, which is situated in Kalahandi district of Odisha. The area is constitutes a part of the Precambrian khondalite-charnockite-granite gneiss terrane of Eastern Ghats. Corundum is light pink while ruby is rose red, carmine or purple red in colour. The corundum and ruby grains contain inclusions of rutile and zircon and are often surrounded by dark coloured spinel exhibiting corona texture. Sapphirine occurs as rim around spinel as well as corundum. Veinlets of hematite and diaspore traverse spinel and sapphirine aggregates. SEM-EDS analysis indicated that (i) corundum and ruby grains contains trace amounts of Fe and Cr, (ii) spinel is pleonaste and chromium pleonaste types and (iii) sapphirine is silica- poor and magnesian rich. The corundum-spinel intergrowth showing corona texture suggests that under high P-T gradient in granulite facies metamorphism, corundum reacted with either phlogopite or garnet to form spinel by the reactions: (i) Corundum + Phlogopite= Spinel + K-feldspar + Water or (ii) Corundum+Garnet = Spinel. Sapphirine is possibly a reaction product of (i) Corundum+Spinel+Garnet= Sapphirine or (ii) Spinel+Silica= Sapphirine.
刚玉和红宝石在奥里萨邦Kalahandi区的Kermunda地区周围的土壤层中零星地出现。该地区是东高止山脉前寒武纪孔雀岩-绿绿岩-花岗片麻岩地体的一部分。刚玉呈浅粉色,而红宝石呈玫瑰红、胭脂红或紫红色。刚玉和红宝石颗粒含有金红石和锆石包裹体,通常被深色尖晶石包围,呈现日冕结构。蓝宝石以尖晶石和刚玉的边缘形式存在。赤铁矿和一水硬石细脉穿过尖晶石和蓝宝石聚集体。SEM-EDS分析表明:(1)刚玉和红宝石晶粒中含有微量的Fe和Cr,(2)尖晶石为杂石和铬杂石型,(3)蓝宝石为贫硅富镁型。刚玉-尖晶石共生体呈冕状结构,表明在麻粒岩相变质过程中,在高P-T梯度下,刚玉与辉云母或石榴石反应形成尖晶石,反应方式为:(i)刚玉+辉云母=尖晶石+钾长石+水或(ii)刚玉+石榴石=尖晶石。蓝宝石可能是(i)刚玉+尖晶石+石榴石=蓝宝石或(ii)尖晶石+二氧化硅=蓝宝石的反应产物。
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引用次数: 4
Satellite Datasets and there Scaling Factor for Land Surface Temperature 地表温度的卫星数据集及其标度因子
Pub Date : 2014-08-26 DOI: 10.4172/2329-6755.1000E118
M. Boori, V. Voženílek, H. Balzter
Copyright: © 2014 Boori MS, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Satellite remote sensing, which can continually observe various surface processes on a global scale, has explicitly facilitated such studies [1-3]. While remote sensing plays an increasingly important role in large-scale environmental monitoring, it has also been criticized for its inherently limited spatial resolution [4-6]. This limitation weakens the reliability of studies based on satellite data due to uncertainty generated from spatial heterogeneity.
版权所有:©2014 Boori MS, et al。这是一篇根据知识共享署名许可协议发布的开放获取文章,该协议允许在任何媒体上不受限制地使用、分发和复制,前提是要注明原作者和来源。卫星遥感可以在全球范围内连续观测各种地表过程,为这类研究提供了明确的便利[1-3]。虽然遥感在大尺度环境监测中发挥着越来越重要的作用,但其固有的空间分辨率有限也受到了批评[4-6]。由于空间异质性产生的不确定性,这一限制削弱了基于卫星数据的研究的可靠性。
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引用次数: 4
Rooftop Rainwater Harvesting for Recharging Shallow Groundwater 屋顶雨水收集补给浅层地下水
Pub Date : 2014-08-04 DOI: 10.4172/2329-6755.1000172
R. Rao, Giridhar Mvss
Water management is very critical for the growth and development of any economy, more so in a developing countries like India. However, resource is now under stress, because of excessive groundwater abstraction in the course of socioeconomic development and meeting increasing needs of growing population. Therefore, we need to conserve this precious resource while benefiting from it. The prime objective of the study is to identify the potentiality of rainwater for recharging shallow Groundwater in the Jawaharlal Nehru Technological University Hyderabad, Kukatpally campus. Normal annual rainfall in the study area is 821mm with unutilized non-committed surplus monsoon runoff. Artificial recharge of ground water through rooftop rainwater harvesting was done by constructing three recharge structures each with a capacity of 1,00,000 litres at different places in the study area with two recharge shafts for injecting rainwater into unconfined and confined aquifer system. Three measuring bore wells (piezometers) with a diameter of 6” were dug upto a depth of 30 m near the recharge structures for impact assessment studies. Water levels measured in the three bore wells on daily basis during the monsoon period were found to be 86.3, 90.2, 38.3 ft on 15th June 2012 before rainwater recharge and the corresponding water levels have been improved to 50.7, 56.5, 10.3 ft respectively on 1st October 2012 due to recharge of rainwater. A corresponding rise of 35.6, 33.7, 28.0 ft in groundwater levels has been registered indicating significant improvement of groundwater levels. Rainfall received during the years 2012 and 2013 is 774 and 1104 mm respectively. Total amount of surplus rainwater received during 2012 is 7,11,174, 8,93,849 and 4,74,814 liters recharged near Near Library, Near Girls Hostel and Near New IST respectively. Total amount of surplus rainwater received during 2013 is 10,13,563, 12,73,911 and 6,76,703 liters recharged near Near Library, Near Girls Hostel and Near New IST respectively. A total rainfall of 774 and 1104 mm has been found to be recorded and a total quantity of 50,44,013 liters of groundwater has been found to be recharged during the years 2012 and 2013 years respectively
水资源管理对任何经济体的增长和发展都至关重要,对印度这样的发展中国家更是如此。然而,由于社会经济发展和人口增长对地下水的过度开采,水资源正处于紧张状态。因此,我们需要在受益的同时保护这一宝贵资源。该研究的主要目标是确定雨水补给海得拉巴贾瓦哈拉尔尼赫鲁理工大学库卡帕利校区浅层地下水的潜力。研究区年正常降雨量为821mm,剩余季风径流未被利用。通过屋顶雨水收集对地下水进行人工补给,在研究区域的不同地方建造了三个补给结构,每个补给结构的容量为10万升,并有两个补给井,将雨水注入无承压和承压含水层系统。在补给结构附近挖了3口直径为6英寸的测量井(压力计),深度为30米,用于影响评估研究。雨季期间,三口井每天测量的水位在2012年6月15日雨水补给前分别为86.3、90.2和38.3英尺,由于雨水补给,相应的水位在2012年10月1日分别提高到50.7、56.5和10.3英尺。地下水水位相应上升35.6英尺、33.7英尺和28.0英尺,表明地下水水位显著改善。2012年和2013年的降雨量分别为774毫米和1104毫米。2012年收集的剩余雨水总量分别为7,11,174,8,93,849和4,74,814升,分别在附近图书馆,附近女生宿舍和附近新科技学院附近进行补给。2013年接收的剩余雨水总量分别为10,13,563,12,73,911和6,76,703升,分别在附近图书馆,附近女生宿舍和附近新IST附近补给。2012年和2013年的总降雨量分别为774毫米和1104毫米,地下水补给总量分别为50,44,013升
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引用次数: 8
Correlations of Remote Sensing Chlorophyll-a Data and Results of A Numerical Model of the Tropical and South Atlantic Ocean Circulation 遥感叶绿素- A数据与热带和南大西洋环流数值模式结果的相关性
Pub Date : 2014-07-30 DOI: 10.4172/2329-6755.1000171
N. E. D. S. Pereira, J. Harari, R. Camargo
The Tropical and South Atlantic Ocean are characterized by important large scale features that have seasonal character. The interactions between atmospheric and oceanic phenomena compose a complex system where variations in physical parameters affect the distribution of primary production. Previous studies showed that the variability of physical parameters displays high values of cross-correlation with chlorophyll-a, with strong dependence on latitude and variability in the biological response time. This study aims to correlate data of chlorophyll-a from MODIS with the results of a hydrodynamic numerical model, in the period 2003 - 2009. The annual and semi-annual signals are predominant both in MODIS and model data but, even excluding these components, the residual correlations are still high. On the other hand, annual and semi-annual signals have smaller standard deviation than the remaining (residual) frequencies. The cross-correlations between chlorophyll-a and salinity, temperature and surface elevation showed spatial distribution patterns with well-defined latitudinal character, presenting higher modulus of correlation for temperature and salinity, above +0.6 in the polar region and below -0.5 in the tropical area. A general pattern of negative correlations in the regions of low concentration and positive in regions of high concentration was obtained, except the Equator (region of high chlorophyll concentration, which is characterized by a negative correlation for all variables, except the intensity of the currents). The cross-correlations between chlorophyll and physical parameters corroborate the pattern found in the correlations considering lag zero, stressing aspects as the positive correlation with the intensity of the currents in the equatorial region and the negative correlation with the surface elevation inside the South Atlantic Subtropical Gyre (SASG), both presenting immediate response. The analysis of spatial distributions of the cross-covariance of Fourier spectra between chlorophyll and each of the physical variables, in the transect 20°W, showed that temperature and salinity presented the best defined signals, especially in the periods of 3.5, 2.3, 0.7, and 1.7 years, with varying spatial distributions and time lags. These signals are found in the literature, being associated with ENSO phenomena.
热带和南大西洋具有重要的大尺度特征,具有季节性特征。大气和海洋现象之间的相互作用构成了一个复杂的系统,其中物理参数的变化影响初级生产的分布。以往的研究表明,物理参数的变异与叶绿素-a呈高度的交叉相关,对纬度和生物响应时间的变异有很强的依赖性。本研究旨在将2003 - 2009年MODIS的叶绿素-a数据与水动力数值模型的结果相关联。年际和半年度信号在MODIS和模式数据中都占主导地位,但即使排除这些成分,残差相关性仍然很高。另一方面,年度和半年度信号的标准差小于剩余(残差)频率。叶绿素-a与盐度、温度和地表高程呈明显的空间分布特征,温度和盐度的相关模量较高,极地在+0.6以上,热带在-0.5以下。除了赤道(叶绿素浓度高的区域,其特征是除电流强度外,所有变量都呈负相关)外,低浓度区域呈负相关,高浓度区域呈正相关。叶绿素与物理参数的互相关证实了考虑滞后零的相关规律,强调与赤道地区洋流强度正相关、与南大西洋副热带环流(SASG)内地表高程负相关等方面均呈现即时响应。20°W样带叶绿素与各物理变量傅里叶光谱交叉协方差的空间分布分析表明,温度和盐度在3.5、2.3、0.7和1.7年期间呈现出最清晰的信号,且具有不同的空间分布和时间滞后。这些信号在文献中被发现,与ENSO现象有关。
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引用次数: 1
Improving Innovative Mathematical Model for Earthquake Prediction 改进地震预报的创新数学模型
Pub Date : 2014-07-21 DOI: 10.4172/2329-6755.1000168
S. Kannan
The Innovative Mathematical Model for Earthquake Prediction (IMMEP) based on Spatial Connection Theory and reverse Poisson’s distribution was developed previously. Using data from National Earthquake Information Center (NEIC), Spatial Connection Models were constructed using KML programming language in Google Earth program for six fault zones around the world: California, Central USA, Northeast USA, Hawaii, Turkey, and Japan. The Poisson Range Identifier (Pri) values were computed, and the Poisson’s Distribution was applied to the Pri values to arrive at a distance factor. Based on the reverse Poisson’s Distribution, earthquake predictions were carried out. To improve the Innovative Mathematical Model for Earthquake Prediction, further analysis was carried out on California fault zone earthquake data, utilizing Poisson’s and Exponential Distributions. The predictions of the Poisson’s and Exponential Distribution were nearby validating the Spatial Connection Theory By using technological advances and improving the probability of future earthquake predictions, this research provides an effective contribution to earth science. Utilizing the results of this research, disaster management agencies around the world can allocate their resources in appropriate locations to assist people during evacuation and save lives.
基于空间联系理论和逆泊松分布的地震预报创新数学模型(IMMEP)是前人提出的。利用美国国家地震信息中心(NEIC)的数据,在Google Earth程序中使用KML编程语言构建了全球6个断裂带的空间连接模型:加利福尼亚、美国中部、美国东北部、夏威夷、土耳其和日本。计算泊松距离标识符(Pri)值,并对Pri值应用泊松分布得到距离因子。利用逆泊松分布进行地震预报。为完善创新的地震预测数学模型,利用泊松分布和指数分布对加利福尼亚断裂带地震数据进行了进一步分析。泊松分布和指数分布的预测接近于验证空间联系理论,通过利用技术进步和提高未来地震预测的概率,为地球科学提供了有效的贡献。利用这项研究的结果,世界各地的灾害管理机构可以将他们的资源分配到适当的地点,以帮助人们撤离和拯救生命。
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引用次数: 2
Review of Electrical Prospecting Technology for Coal Mining in China 中国煤矿电法找矿技术综述
Pub Date : 2014-07-17 DOI: 10.4172/2329-6755.1000E117
X. Guoqiang, L. Shu-cai, Chen Weiying, Hou Dongyang
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引用次数: 0
An Assessment of Climate Change-Natural Disaster Linkage in Indian Context 印度环境下气候变化与自然灾害联系的评估
Pub Date : 2014-07-07 DOI: 10.4172/2329-6755.1000167
A. Mishra
Natural disasters and climate change are fast emerging as the most defining challenges of the 21st century. India`s unique geo-climatic condition makes it highly susceptible to climate change and natural disasters. The country has observed significant anomaly in natural variability of temperature and rainfall patterns and has experienced more frequent and lethal disasters in recent decades. Almost unanimous but uneven temperature rise over the Indian subcontinent has propelled more energy in regional and local climate systems, and thus, has magnified climate anomalies and frequency as well as severity of natural disasters. The paper investigates the climate change and natural disasters propensities and highlights the climate change-disaster linkage in Indian context. It also identifies vulnerable areas and suggests some policy measures which may be of great help in reducing the impact of these catastrophes on society.
自然灾害和气候变化正迅速成为21世纪最具决定性的挑战。印度独特的地理气候条件使其极易受到气候变化和自然灾害的影响。该国观察到温度和降雨模式的自然变化明显异常,近几十年来经历了更频繁和更致命的灾害。印度次大陆几乎一致但不均匀的气温上升,给区域和局部气候系统带来了更多的能量,因此,加剧了气候异常、自然灾害的频率和严重程度。本文考察了气候变化与自然灾害的倾向,并强调了印度环境下气候变化与自然灾害的联系。它还确定了脆弱的地区,并提出了一些政策措施,这些措施可能对减少这些灾难对社会的影响有很大帮助。
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引用次数: 10
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Journal of Geology and Geosciences
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