AGSO journal of Australian geology & geophysics最新文献_第9页

Bank Erosion Pattern Analysis by Delineation of Course Migration of the Padma River at Harirampur Upazila Using Satellite Images and GIS Part II 基于卫星图像和GIS的帕德玛河在Harirampur Upazila河道迁移的河岸侵蚀模式分析(二)

AGSO journal of Australian geology & geophysics Pub Date : 2017-03-21 DOI: 10.4172/2381-8719.1000284

Rahman Mm, Islam Mn

{"title":"Bank Erosion Pattern Analysis by Delineation of Course Migration of the Padma River at Harirampur Upazila Using Satellite Images and GIS Part II","authors":"Rahman Mm, Islam Mn","doi":"10.4172/2381-8719.1000284","DOIUrl":"https://doi.org/10.4172/2381-8719.1000284","url":null,"abstract":"The river Padma had showed different planform pattern with the changes from meandering to braided, which \u0000 varied spatially and temporally. Sequential left bankline migration of the Padma river at Harirampur upazila had been \u0000 explored from topographic and aerial photography maps of 1765, 1860, 1925, 1943, 1952, 1963 and time series \u0000 digital satellite images from 1973 to 2009, and also using geographic information services (GIS). The Padma was \u0000 the narrowest channel in 1860 along Faridpur-Harirampur nodal line. The results by interpretation maps from 1860 \u0000 to 1925 indicated that the left bankline migration of the Padma at Harirampur upazila was limited within a range of 2 \u0000 km and it was limited to 2.6 km until 1963. But the river caused extreme bank line shifting towards the upazila \u0000 around 10 km during 1973-2009 and created a deep embayment at this location. A particular erosion pattern \u0000 developed a meandering bend and in one season, the lateral maximum highest erosion extent was 2200 m/year in \u0000 2000-2001. The left bank line has already started to retreat from Harirampur due to the development of a chute cutoff. \u0000 The three locations (site 1, 2, 3) can be vulnerable to erosion by the construction of river training work at Mawa.","PeriodicalId":80381,"journal":{"name":"AGSO journal of Australian geology & geophysics","volume":"15 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2017-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84333654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Preliminary Magnetostratigraphic and Isotopic Dating of the Ngwa Formation (Dschang Western Cameroon) 喀麦隆西部Dschang Ngwa组的初步磁地层和同位素定年

AGSO journal of Australian geology & geophysics Pub Date : 2017-02-23 DOI: 10.4172/2381-8719.1000282

M. Benammi, Hell Jv, M. Bessong, D. Nolla, J. Solé, M. Brunet

{"title":"Preliminary Magnetostratigraphic and Isotopic Dating of the Ngwa Formation (Dschang Western Cameroon)","authors":"M. Benammi, Hell Jv, M. Bessong, D. Nolla, J. Solé, M. Brunet","doi":"10.4172/2381-8719.1000282","DOIUrl":"https://doi.org/10.4172/2381-8719.1000282","url":null,"abstract":"A magnetostratigraphic study has been carried out to constrain the age of the volcano-sedimentary Ngwa formation in the eastern part of the Dschang region. A stratigraphic section of about 80 meters thick corresponding to 26 sites has been sampled, and it is composed mainly of fine-grained sandstones, clays, lignite, volcanic sediment and tuffs. A magnetic study conducted on 56 samples shows one or two components of magnetization carried either by titanomagnetite, magnetite and Fe-sulphide. The section that was sampled shows one normal polarity and one reversed polarity. In the lower part of the section, a K-Ar radiometric dating was performed on the plagioclase minerals isolated from the tuffs level situated about 15 meters above the lignite seam, and gave an age of 20.1 Â± 0.7 Ma. Constrained by this age, the observed polarity zones can be readily correlated with chrons C6An.1n-C6An.1r of the GPTS. This study suggests that the age of the lignite is comprised between 20.04 Ma and 20.21 Ma. The mean direction of the characteristic remanent magnetization documents a counterclockwise vertical axis rotation of about 8Â° with respect to the expected Lower Miocene direction derived from the Africa polar wander curve.","PeriodicalId":80381,"journal":{"name":"AGSO journal of Australian geology & geophysics","volume":"52 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2017-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90062352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Micropaleotological studies of Ewekoro Sediments Southwestern Nigeria 尼日利亚西南部Ewekoro沉积物的微古生学研究

AGSO journal of Australian geology & geophysics Pub Date : 2017-01-30 DOI: 10.4172/2381-8719.1000280

Oladosu Yc, Ogundipe Oy

{"title":"Micropaleotological studies of Ewekoro Sediments Southwestern Nigeria","authors":"Oladosu Yc, Ogundipe Oy","doi":"10.4172/2381-8719.1000280","DOIUrl":"https://doi.org/10.4172/2381-8719.1000280","url":null,"abstract":"The study determines the micropaleontological studies of Ewekoro sediments in South Western region of Nigeria. \u0000 The area of the study lies between latitudes 6°47N-6°53N and longitudes 335E-3°40E. Samples were collected from \u0000 fleshly exposed surface of Ewekoro formation of Dahomey basin at an interval of 2 m. These samples were subjected \u0000 to lithological description to determine the grain size, color, sorting also to standard micropaleontological analysis to \u0000 recover the foraminifera which were used to determine the age, paleonenvironment of deposition and stratigraphic \u0000 equivalence of the formation. The study showed that the limestone at the basal part of the sequence were sub-angular \u0000 to sub-rounded shaped, poorly sorted and with yellowish brown color indicate disturbed environment. While the upper \u0000 shale are fined grained, greenish in color, dark-grey and showing high fissility. The foraminifera recovered include, Lenticulina degolyeri, globorotalia, pseudomonarrdii, Globigerina linaperta, Globigerina yeguaensis and cibicides sp. \u0000 This is occurrence of some planktonic foraminifera which are indicative of marine environment. Therefore, there must \u0000 have been an incursion of marine water into the environment. However, the paleoenvironment of deposition ranged \u0000 from inner neritic to middle neritic.","PeriodicalId":80381,"journal":{"name":"AGSO journal of Australian geology & geophysics","volume":"15 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2017-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73658609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

New Diagram Useful for Classification of Groundwater Quality 地下水水质分类新图解

AGSO journal of Australian geology & geophysics Pub Date : 2017-01-30 DOI: 10.4172/2381-8719.1000279

Elhag Ab

{"title":"New Diagram Useful for Classification of Groundwater Quality","authors":"Elhag Ab","doi":"10.4172/2381-8719.1000279","DOIUrl":"https://doi.org/10.4172/2381-8719.1000279","url":null,"abstract":"Due to human and human activities the groundwater is polluted. This is the serious problem now a century. Thus \u0000 the analysis of the water quality is very important to preserve and prefect the natural ecosystem.The primary objective \u0000 of this paper is to study the groundwater quality parameters. \u0000 The mechanism of chemical reactions leading to the change in the composition of groundwater and source of the \u0000 dissolved ions in the groundwater can be understood by Banaga's diagram. The Banaga method is not only shows \u0000 graphically the nature of a given water sample and dictates the relationship to other samples but there are a number of \u0000 different methods and schemes used to classify natural water quality, source, origin and determine their suitability for \u0000 different purposes depending on the concentrations of the basic components. \u0000 The new diagram is useful for better understanding the evolution of hydrochemical parameters of groundwater \u0000 that can be by plotting the concentration of major cations and anions in percentage of meq/l, and it is divides the water \u0000quality into five types. The results of this analysis were compared with the water quality standards of Piper diagram.","PeriodicalId":80381,"journal":{"name":"AGSO journal of Australian geology & geophysics","volume":"13 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2017-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89897289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Geophysical Investigation of Geothermal Potential of the Gilgil Area Nakuru County, Kenya Using Gravity 利用重力对肯尼亚Nakuru县Gilgil地区地热潜力的地球物理调查

AGSO journal of Australian geology & geophysics Pub Date : 2017-01-25 DOI: 10.4172/2381-8719.1000278

Nyakundi Er, Githiri Jg, W. Ambusso

{"title":"Geophysical Investigation of Geothermal Potential of the Gilgil Area Nakuru County, Kenya Using Gravity","authors":"Nyakundi Er, Githiri Jg, W. Ambusso","doi":"10.4172/2381-8719.1000278","DOIUrl":"https://doi.org/10.4172/2381-8719.1000278","url":null,"abstract":"In this study, gravity survey was used to investigate the geothermal potential field in Gilgil area Nakuru County, Kenya. The ground based CG-5 Autograv gravimeter was used to accurately measure gravity at each field station. A total of 147 gravity stations were established over an area of about 68 km2 and gravity corrections done. The complete bouguer anomaly was computed and a contour map for the study area plotted using surfer 8.0 software. Qualitative interpretation of the map shows gravity highs in the study area which were interpreted as dense bodies within the subsurface. Five profiles along the gravity highs were drawn and oriented in the directions SW-NE, NW-SE and almost N-S. The regional trend of the profiles was subtracted from the observed data yielding the residual anomaly. 2D Euler deconvolution was done on the profile data and revealed subsurface faults and bodies at a depth range of 790m-4331m. Forward modelling of selected profiles using Grav 2DC software revealed presence of dense intrusive bodies on the northern and southern parts of the study area with the density contrast range of 0.25-0.28. These bodies were interpreted as intrusive dykes that have higher density than surrounding rocks. Such intrusive dykes may be geothermal heat sources.","PeriodicalId":80381,"journal":{"name":"AGSO journal of Australian geology & geophysics","volume":"40 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2017-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79540858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Radioactive Disequilibrium Studies in Uranium Series of Core Samples of Koppunuru Area, Guntur District, Andhra Pradesh, India 印度安得拉邦Guntur地区Koppunuru地区岩心铀系放射性不平衡研究

AGSO journal of Australian geology & geophysics Pub Date : 2017-01-25 DOI: 10.4172/2381-8719.1000277

Y. Srinivas, R. Singh, R. Banerjee, P. Sharma, M. Verma

{"title":"Radioactive Disequilibrium Studies in Uranium Series of Core Samples of Koppunuru Area, Guntur District, Andhra Pradesh, India","authors":"Y. Srinivas, R. Singh, R. Banerjee, P. Sharma, M. Verma","doi":"10.4172/2381-8719.1000277","DOIUrl":"https://doi.org/10.4172/2381-8719.1000277","url":null,"abstract":"Disequilibrium studies were attempted on mineralised core samples (n=870) from Koppunuru uranium deposit located in south-western part of Palnad sub-basin, Guntur district, Andhra Pradesh, India. The area exposes Banganapalle quartzites unconformably deposited over altered biotite granite (basement). Uranium mineralisation in Koppunuru deposit is hosted by Banganapalle quartzites well above the unconformity, and grit/basement granite close to the unconformity contact. For disequilibrium studies, the core samples were broadly divided in two groups, (a) quartzite hosted (above unconformity) and (b) basement granite hosted mineralisation (below unconformity). Average disequilibrium factor of 41% has been recorded in favour of parent uranium in both types of core samples. It shows significant enrichment of uranium in the system as evident from 41% of disequilibrium in favour of parent uranium. This is probably due to significant migration of some of the daughter radio nuclides due to dissolution of minerals by groundwater action. Besides, the escape of radioactive radon might have accentuated the disequilibrium factor thus increasing the grade of uranium mineralization. The presence of fractures and faults in the study area are the probable conduits for radon migration/escape. Linear regression coefficient between uranium and radium is 0.98 indicates invariability of disequilibrium irrespective of grade.","PeriodicalId":80381,"journal":{"name":"AGSO journal of Australian geology & geophysics","volume":"4 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2017-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75971772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application of Well Logging Techniques for Identification of Coal Seams: A Case Study of Auranga Coalfield, Latehar District, Jharkhand State, India 测井技术在煤层识别中的应用——以印度贾坎德邦Latehar地区Auranga煤田为例

AGSO journal of Australian geology & geophysics Pub Date : 2017-01-01 DOI: 10.4172/2381-8719.1000322

J. Srinaiah, D. Raju, G. Udayalaxmi, G. Ramadass

引用次数: 4

Investigating Structural and Tectonic Evolution of Central Afghanistan Using Remote Sensing and Gravity Data 利用遥感和重力资料研究阿富汗中部构造和构造演化

AGSO journal of Australian geology & geophysics Pub Date : 2017-01-01 DOI: 10.4172/2381-8719.1000313

S. Rustami, N. Saadi, E. Aboud, K. Yonezu, Koichiro Watanabe

引用次数: 7

Two-Dimensional Seismic Interpretation and Petroleum System Modelling in the Hammerfest Basin, SW Barents Sea 巴伦支海西南Hammerfest盆地二维地震解释与含油气系统建模

AGSO journal of Australian geology & geophysics Pub Date : 2017-01-01 DOI: 10.4172/2381-8719.1000273

M. Ms

{"title":"Two-Dimensional Seismic Interpretation and Petroleum System Modelling in the Hammerfest Basin, SW Barents Sea","authors":"M. Ms","doi":"10.4172/2381-8719.1000273","DOIUrl":"https://doi.org/10.4172/2381-8719.1000273","url":null,"abstract":"The Hammerfest Basin has undergone several structural and tectonic evolutions which affected its petroleum systems. Two-dimensional seismic interpretation and petroleum system modelling of the Hammerfest Basin was done in order to understand the petroleum system and effects of uplift and subsidence on hydrocarbon distribution, accumulations, maturity, migration and leakage. The central part of the Hammerfest Basin has been affected by Jurassic syn-rift faults forming a large graben structure in response to subsidence along the folded Asterias Fault Complex and Troms-Finnmark Fault Complex. The graben structure is characterized by gas chimney, bright spots and pockmarks. The modelling result shows that the Jurassic Hekkingen Formation is less mature (oil window) and that the Snadd and Kobbe Formations are mature to highly mature (gas window), respectively. The Sto and Tubaen reservoirs are enriched with oil and gas which migrated from the Snadd and Kobbe source rocks. The hydrocarbon accumulations show that the Sto Formation is the main reservoir in the Hammerfest Basin. Rapid burial during Permian and late Cretaceous was followed by uplift events. Three phases of erosion: the first two phases of erosion (75 to 60 Ma and 30 to 15 Ma) affected and eroded 200 m of Kveite Formation and 300 m of the Torsk Formation, respectively and the third phase of erosion (2.5 to 0.01 Ma) has eroded 100 m of Torsk Formation. The oil migration follows the deep seated faults along the Asterias Fault Complex, Troms-Finnmark Fault Complex and along the bounding faults of the graben structure at the center of the basin which leads to leakage. The migration of gas on the other hand, is vertically upward throughout the basin leaking out of the seal. The gas migration has been enhanced by the uplift and subsidence events which have been the main controlling factors of the hydrocarbon maturation and distribution within the Hammerfest Basin.","PeriodicalId":80381,"journal":{"name":"AGSO journal of Australian geology & geophysics","volume":"1 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90805375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Geotechnical Index Properties of Soils in Abua and Environs: A Case Study of Obedum-Anyu-Emelago Road Abua及其周边地区土壤岩土力学指标特性研究——以Obedum-Anyu-Emelago公路为例

AGSO journal of Australian geology & geophysics Pub Date : 2017-01-01 DOI: 10.4172/2381-8719.1000326

Ekpelu Km, Soronnadi Ononiwu Gc, Didei Is

{"title":"Geotechnical Index Properties of Soils in Abua and Environs: A Case Study of Obedum-Anyu-Emelago Road","authors":"Ekpelu Km, Soronnadi Ononiwu Gc, Didei Is","doi":"10.4172/2381-8719.1000326","DOIUrl":"https://doi.org/10.4172/2381-8719.1000326","url":null,"abstract":"The frequent collapse of engineering structure and in incessant cracks witnessed on walls of buildings within the Obedum-Anyu-Emelego axis of Abua/Odual Local Government Area of Rivers State prompted the need for geotechnical investigation to assess the suitability of soils and characterize their engineering properties as a guide to foundation designs. Soil samples were obtained between 0 and 30 metres depth and used in the study. The field boring and laboratory results shows that the stratigraphy is predominantly of medium with soft to firm brown mottle grey salty peaty clay and soft to firm grey mottle brown salty peaty clay in shallow borings of 2 m. The organic peaty clay layers are very poorly suited to support foundations due to very high compressibility compared to other materials. Laboratory analyses showed that the clays are characterized by moderately high moisture content and compressibility and fairly low undermined strength. CBR values between 5.7 percent to 8.5 percent, liquid limit between 38.8 percent and 50.6 percent, plasticity limit 18.8 percent and 25.5 percent. Comparison of these ranges of geotechnical properties with Bench Mark for sub grade indicated that they are of low standard. Recommendation includes the need for stabilization with lime and cement to avoid the collapse of structure or buildings within the study area.","PeriodicalId":80381,"journal":{"name":"AGSO journal of Australian geology & geophysics","volume":"5 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87594986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0