AGSO journal of Australian geology & geophysics最新文献

{"title":"Integration of Aeromagnetic Interpretation and Induced Polarization Methods in Delineating Mineral Deposits and Basement Configuration within Southern Bida Basin, North-West Nigeria","authors":"U. AyatuOjonugwa, C. ChukwudiEzeh, I. AugustineChinwuko","doi":"10.4172/2381-8719.1000449","DOIUrl":"https://doi.org/10.4172/2381-8719.1000449","url":null,"abstract":"Aeromagnetic data interpretation and Induce Polarization (IP) method has been integrated and interpreted with a view of delineating magnetic minerals within some part of the Southern Bida Basin, Nigeria. Spectral analysis method was used in delineating the depth to magnetic basement and model prominent magnetic anomaly. Analysis of Induce Polarization data were used in delineating the potential fractures zones of mineralization. Visual inspection of the magnetic anomalies and first vertical derivative maps reveals that the area is highly faulted with major faults trending East-West (E-W) and minor ones Northeast-Southwest (NE-SW) directions. The qualitative interpretation results of both the resistivity and chargeability pseudosections reveal potential fractures zones trending East-West (E-W) and the depth to the anomalous body ranges from (0.3-2.5 km) with average overburden thickness of 2.1 km. Two depth source models were interpreted using Discrete Fourier Transform method (spectral analysis) namely; the shallower sources which range from 0.45 to 1.49 km and the deeper ones which range from 1.81 to 3.24 km. The quantitative interpretation of the aeromagmatic data, depict that the average sedimentary thickness ranges from (2.3-3.2 km) and the average depth to the Curie isotherm in the area is 24.76 km. The result also shows that the Curie temperature isotherm within the basin is not a horizontal level surface, but is undulating. The regional average results for both geothermal gradient and heat flow across the study area are 23.07°C/km and 57.66 W/m2 respectively. Based on the computed sedimentary thicknesses (2.3-3.2 km), the geothermal gradient (22.27 and 37.00°C/km.) and the prevalent fractures, the possibility of hydrocarbon accumulation in the northern and southeastern part of the study area is feasible whereas other parts of the study area with low sedimentary thicknesses will favour magnetic mineral deposits such as the prevalent oolitic iron ore deposits at Agbaja and Kotonkarifi axes.","PeriodicalId":80381,"journal":{"name":"AGSO journal of Australian geology & geophysics","volume":"7 1","pages":"1-13"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78593150","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}

{"title":"Integrated Geophysical Analysis and Rock Physics Study to Confirm the Hydrocarbon Reservoir of the Bitrisim Area in Pakistan","authors":"Ibrar Iqbal, G. Tian, S. Iqbal, Amin-ud-din H. R. Khan","doi":"10.4172/2381-8719.1000330","DOIUrl":"https://doi.org/10.4172/2381-8719.1000330","url":null,"abstract":"Horst and graben structure is the symbolic depiction of extensional tectonics in Pakistan, which was our research study area with (Bitrisim) as a communal example. To carry out the structural and stratigraphic interpretation of our study area, we used two seismic dip lines and one strike line. Two way time and depth mapping helped in outlining the structural trend and understanding the tectonics of the area. Subsurface mapping indicated that the major fault trend was NNW-SSE. There were marks of faults breaking out, indicating the existence of various tectonic periods. The dominant structural trend of the area provided the basic components of a profile petroleum system. We also tried to find the porosity and volume of the shale. 1D modeling has been done for the wells of Fateh-01. The zone under observation was Lower Goru. Porosity calculations were made to determine the water and hydrocarbon saturation. The main elements of a petroleum system are presented and also proven by a number of oil and gas findings, but there is still a need for advanced techniques to improve seismic resolution and the excellence of interpretation.","PeriodicalId":80381,"journal":{"name":"AGSO journal of Australian geology & geophysics","volume":"4 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79386152","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}

{"title":"Meandering Bend Development Process at Mawa Reach of the Padma River","authors":"Muhammad Muzibur Rahman, M. NazrulIslam","doi":"10.4172/2381-8719.1000338","DOIUrl":"https://doi.org/10.4172/2381-8719.1000338","url":null,"abstract":"The river Padma developed a meandering bend at the right bank of Mawa reach (reach 2) in meandering platform stage. The bend development process started in 1992 and continued in full form up to 2000. Maximum lateral extension occurred 780 m/yr in 1995-96 and average lateral extension was 450 m/yr. During the bend development process the Padma eroded more than 12,500 ha landmass at the bend location. The highly erodible bank materials and river characteristics allowed the bend formation at this location. A good number of samples measurement of different time indicated that the meandering wavelength of the river reach varied from 30 to 40 km. The meandering width of the river reach was about 17 km in 2000. The bend sustained only for 8 years (1992-2000) and was not so concave but the bend has great significance upon the river training work like the constricting Padma River Bridge. Satellite images of CEGIS and several definition diagram models of meandering bend have been developed to explain the bend formation process and bend characteristics.","PeriodicalId":80381,"journal":{"name":"AGSO journal of Australian geology & geophysics","volume":"29 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85532005","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}

{"title":"The Detectability of Ute Coal Seam Using Geo-Electric Method, Ondo State, Nigeria","authors":"E. Tolulope, Muslim B. Aminu","doi":"10.4172/2381-8719.1000337","DOIUrl":"https://doi.org/10.4172/2381-8719.1000337","url":null,"abstract":"A Geo-electric survey over the Ute coal deposit, Ondo state, has been carried out using schlumberger electrode array configuration. The Geophysical investigation which involves vertical electrical sounding (VES) techniques was done using ABEM SAS 1000 resistivity meters with aim of determining the detectability of coal and hence the ability to image it away from its outcrop location. The inter-electrode spacing varies from 1 to 65 m with maximum spread length of 130 m. Generally, the study area is underlain by five geo-electric layers: the lateritic topsoil, shale, siltstone, coal and fine grained sandstone. The sounding curve obtained in the area is KQH type. The VES method when continuously implemented can be used for reconnaissance mapping of the Ute coal deposit. The resulted thickness of the coal indicates that it can be used by individuals and local investors for domestic purposes especially coal fires for generation of electric power for Ute and its environs.","PeriodicalId":80381,"journal":{"name":"AGSO journal of Australian geology & geophysics","volume":"48 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91213402","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}

{"title":"Study of Generation Conditions of Lower Part of Productive Series in Case of Absheron Oil-Gas Bearing Region","authors":"Seyidov Vm, K. ln","doi":"10.4172/2381-8719.1000341","DOIUrl":"https://doi.org/10.4172/2381-8719.1000341","url":null,"abstract":"Determination of facial nature of reservoirs has the major value for exploration for oil and gas traps. It is known that lithological traps are mainly related to sand bodies, however not all sand bodies are necessarily traps. Therefore, it is important to perform detailed studies of generation of sand bodies within the limits of studied North-Absheron zone of uplifts in aim to outline most favorable areas for exploration of lithological traps and related to them oil and gas deposits. The study was done by use of technique of logging facies, which allowed defining the genesis of Productive Series layers in Early Pliocene in North-Absheron zone of uplifts. Applied methodology of logging facies is quite effective since it makes possible to perform interpretation visually analyzing spontaneous polarization (SP) and gamma-log (GL) curves.","PeriodicalId":80381,"journal":{"name":"AGSO journal of Australian geology & geophysics","volume":"61 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78243055","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}

{"title":"Mineshaft Imaging Using 2d Electrical Resistivity Tomography in a Kaolin Mining Site at Kankara in North Central Nigeria","authors":"D. Eshimiakhe, R. Jimoh, L. Bagudu, A. Hussaini, Matthew Monday Ogwuche","doi":"10.4172/2381-8719.1000447","DOIUrl":"https://doi.org/10.4172/2381-8719.1000447","url":null,"abstract":"A Kaolin mining site at Dajin Gwanma in north central Nigeria was investigated to detect subsurface voids created due to mining of kaolin deposit and to perhaps suggest areas prone to subsidence. This study was undertaken on conceptual resistivity model that subsurface voids characterized by higher or lower resistivity than the host, depending on weather the void is in-filled water or not. The data collection was carried out with Terrameter SAS 4000 and ES 464 electrode selector equipment. Dipole-dipole configuration at electrode spacing of 5 m was used to acquire the data along parallel profiles laid at equal interval in the study area. The acquired data along each profile were inverted with 2D algorithm. The results show that the voids are characterized by high resistivity (950 Ωm-2500 Ωm) at depth of between 0-4 m and low resistivity (10 Ωm-100 Ωm) at a depth of 5-30 m indicating both air-filled and water-filled voids respectively. The study shows that the voids increase in dimension with depth in NW-SE direction, suggesting that the voids are trending most probably along vertical bedrock joints. It also suggests that voids may overtime grow large enough that the overlying top soil can no longer bridge it, leading to its collapse. Mineshaft Imaging Using 2D Electrical Resistivity Tomography in a Kaolin Mining Site at Kankara in North Central Nigeria","PeriodicalId":80381,"journal":{"name":"AGSO journal of Australian geology & geophysics","volume":"172 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77409786","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}

{"title":"Permo-Triassic Qiseib Formation, Western Side of the Gulf of Suez, Egypt: A Link of Fluvial Facies with Sequence Stratigraphy","authors":"Wanas Ha, S. He","doi":"10.4172/2381-8719.1000333","DOIUrl":"https://doi.org/10.4172/2381-8719.1000333","url":null,"abstract":"Facies analysis of the studied Permo-Triassic Qiseib Formation indicates the presence of five lithofacies. These lithofacies are: matrix-supported conglomerates facies (facies A), coarse-to medium-grained sandstone facies (facies B), heterolithic facies (interbedded sandstone and siltstone) (facies C), interbedded siltstone and claystone facies (facies D), and mixed clastic-carbonate facies (facies E). These facies were deposited in two fluvial environments: low sinuosity braided and high sinuosity meandering. The braided stream deposits dominate the southern portion of the studied area, whereas the meandering stream deposits prevailed in the northern portion. The fine-grained meandering stream deposits grade laterally to the northern part of the study area into tidally-influenced fine-grained meandering strata (estuarine mud). In terms of its sequence stratigraphy, the Qiseib Formation represents a fluvial depositional sequence bounded by two sequence boundaries. This fluvial sequence comprises lowstand-, transgressive- and highstand systems tracts. The Lowstand Systems Tract (LST) is predominantly characterized by braided coarse-grained sandstone deposits (Braided stream facies) with limited fine-grained clastics (floodplain facies). TST includes the coeval tidally-influenced fine-grained meandering strata that occur in the extreme north of the study area. The highstand systems tract (HST) is assigned to the sand bodies of the crevasse splay that encased within the floodplain mudstones, where base level rise slows down. Architectures of deposition of the studied Qisieb Formation were mainly controlled by tectonics and climate change. Influence of sea-level control could be developed during deposition in the northern part of the study area, where the tidally-influenced downstream deposits (estuarine mudsone and siltstone) dominated. Also, the relative proportion of fluvial channel sand bodies and fine over bank deposits of the Qisieb Formation were a result of changes in the balance between accommodation space (A) and sediment supply(S).","PeriodicalId":80381,"journal":{"name":"AGSO journal of Australian geology & geophysics","volume":"23 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82524957","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}

{"title":"Geochemical Characteristics of Sedimentary Manganese Deposit of Binkılıç, Trache Basin, Turkey","authors":"A. Gultekin, N. Balci","doi":"10.4172/2381-8719.1000336","DOIUrl":"https://doi.org/10.4172/2381-8719.1000336","url":null,"abstract":"The Binkilic manganese deposit, occurring in the Congeria and Fish Series of the Oligocene in Thrace Basin, is associated with relatively rapid marine transgressions and regressions across older basement rock and is called as shallow-marine basin-margin deposit. The geochemical characteristics of the deposit were examined by means of major oxide, trace and rare elements (REE) contents and the origin of mineralization was discussed. The deposit contains lower Mn / Fe ratios than those of hydrothermal and sedimentary exhalative deposits. The concentrations of Ba, Co, Sr, Cu, Zn and Ni are closely related to the increase of manganese content and indicate the element’s nature in various manganese minerals. According to trace element spider diagram normalized to shale composite NA, the ore is clearly enriched in Sr, Ni while distinctly depleted in Rb. The chemical analysis results indicated that total REE contents of the samples are relatively low and the ratio of ΣLREE/ΣHREE shows a primary enrichment for LREE that has occurred during the Mn oxidation process. The increase in total LREE is mainly associated with the amount of terrigenous material that was transported in the depositional environment. The chondrite-normalized REE patterns are remarkably similar, yielding HREE-depleted curves with a small negative Ce and middle positive Eu anomalies and reflect their same origin of ore source. The Ce values and Ce/Ce* ratios show that the Binkilic deposit is mainly associated with the marine basin and the ore is formed in both anoxic and oxic conditions. The major oxide, trace element and REE assessments indicated that the Binkilic Mn deposit occurred as a diagenetic type of Mn deposit with terrigenous material addition, but some manganese oxides are related to the upwelling of reducing waters containing abundant organic matter and dissolved Mn to the shallow-marine areas.","PeriodicalId":80381,"journal":{"name":"AGSO journal of Australian geology & geophysics","volume":"59 1","pages":"1-13"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81581688","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}

{"title":"Application of Fry Strain Analysis Technique on Metasediments Arround Danko Area, Sheet 74sw, Part of Zuru Schist Belt, Northwestern Nigeria","authors":"Aleey Umar, D. Ua, T. Najime","doi":"10.4172/2381-8719.1000332","DOIUrl":"https://doi.org/10.4172/2381-8719.1000332","url":null,"abstract":"The study area (Danko) is a part of the Zuru Schist Belt that comprises of Archean and Proterozoic rocks bearing the imprints of the Liberian, Eburnean and Pan-African orogenic events. Three deformational events have been identified (D1, D2 and D3) to have affected the rocks of the study area. The study uses Fry strain analysis method to digitize the center of the grains from which axial ratios and angles to reference lines of fifteen photomicrographs from low grade metasedimentary rocks (quartzites and muscovite schist) so as to understand their deformation pattern and strain history. Quartzite recorded a more intense strain history while muscovite schist recorded a slightly constrictive strain. This study attributes the discrepancy in strain values to be the result of a ductily contrast between the rock types. The majority of the strain in these rocks appears to come from D2 deformation due to the nearly vertical long axis of strain and corresponding field evidence and also shows that there is heterogeneity in bulk strain.","PeriodicalId":80381,"journal":{"name":"AGSO journal of Australian geology & geophysics","volume":"42 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77638164","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}

{"title":"Improved Mapping of the Structural Disposition of Some Younger Granite Ring Complexes of Nigeria Using High Resolution Aeromagnetic Data","authors":"I. IbenemeSabinus, A. OhaIfeanyi, N. AbdulsalamNasir, K. OnuohaMosto","doi":"10.4172/2381-8719.1000443","DOIUrl":"https://doi.org/10.4172/2381-8719.1000443","url":null,"abstract":"Surface and subsurface structural interpretation over a part of the Younger Granite province of Northern Nigeria using Aeromagnetic data was carried out to demonstrate the use of recently available high resolution aeromagnetic data in mapping precisely the Younger Granite. State of the art software packages were used in data reduction, processing/analysis and interpretation. Results of the aeromagnetic study show that the distinct magnetic anomalies clearly revealed in the area coincide spatially with outcropping ring complexes. Apart from outcropping ring complexes, some ring complexes without surface exposures (unexposed ring complexes) were also delineated. One of such ring complexes was studied in greater details and its lateral dimensions with that of the adjoining ring complexes were better resolved. The unexposed ring complex was found to have a surface area extent of approximately 169.5 km2 which is similar to that of Ririwai (180 km2), Banke (128 km2), Kudaru (174 km2) and Zuku (121 km2). The results of the 3D Euler solutions indicate that the depths of the ring complexes range from outcrop to 1800 m. For the inferred unexposed ring complex, the depth ranges from 5 to 1200 m. The Younger Granites show low Source Parameter Imaging (SPI) depth values of about 4 km below the sea level indicating deeper magnetic sources. Three (3) profiles drawn along the NESW, NNW-SSE and E-W directions on the Analytic Signal map of the study area gave an overburden thickness of less than 20 m that masked the unexposed ring complex with its mappable root situated at approximately 200 m below the sea level. The Ririwai, Tibchi, Banke, Amo, Kudaru and Zuku ring complexes have outcrops of approximately 1300 m, 950 m, 920 m, 1400 m, 1150 m and 1220 m respectively above mean sea level with their mappable roots situated at approximately 400 m, 180 m, 400 m, 800 m, 10 m and 300 m respectively below the sea level. It delineated numerous lineaments as structural features whose major trend is along the NE-SW direction. It was equally observed that the ring complexes of Northern Nigeria display diverse surface plans/shapes and exhibit both inward and outward dipping structural orientations with depth. The likely reason for the unexposed nature of the newly proposed ring complex could be as a result of partial subsidence of the enclosed block on which the extrusive edifice of the central volcano originally rested probably occasioned by excess space (much subsurface accommodation) for continuously rising magma within the country rock. Its geometry is supportive of this assertion as it revealed majorly outward dipping trend with depth along different axis. Another reason could be due to incomplete fluidization along the already formed ring fracture and poor assimilation of the country rock by the fluidizing agent amidst a slow/near quiescent piece meal stopping process during the central granite intrusion phase which usually marks the end of ring complex formation. Final","PeriodicalId":80381,"journal":{"name":"AGSO journal of Australian geology & geophysics","volume":"60 1","pages":"1-13"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79334138","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}