Warta Geologi最新文献_第2页

Application Of Schmidt Hammer Rebound Test For Weathering Profile Classification Of Granite, Paya Terubong, Penang, Malaysia 施米特锤回弹试验在马来西亚槟城巴雅特鲁邦花岗岩风化剖面分类中的应用

Warta Geologi Pub Date : 2022-04-28 DOI: 10.7186/wg481202203

Mohamad Anuri Ghazali, M. R. Umor, Mohd Syafiq Hussin, A. G. Md. Rafek

引用次数: 0

Rock-Soil Transition In Weathering Of A Porphyritic Biotite Granite 斑岩型黑云母花岗岩风化过程中的岩石-土壤过渡

Warta Geologi Pub Date : 2022-04-28 DOI: 10.7186/wg481202201

John Kuna Raj

{"title":"Rock-Soil Transition In Weathering Of A Porphyritic Biotite Granite","authors":"John Kuna Raj","doi":"10.7186/wg481202201","DOIUrl":"https://doi.org/10.7186/wg481202201","url":null,"abstract":"Concentric layers of weathered materials around core-stones show the porphyritic biotite granite to experience sequential, but gradational, changes in visible features, textures and mineralogy as it transforms from ‘rock’ into ‘soil’. The changes start with the opening-up of grain boundaries and micro-cracks (stage 1) followed by their dark brown staining (stage 2) and the subsequent alteration (to sericite and clay minerals) of groundmass plagioclase feldspar grains (stage 3). Biotite flakes are then bleached and altered (to chlorite and clay minerals) (stage 4) before there starts alteration (to sericite and clay minerals) of groundmass alkali feldspar grains (stage 5) and finally alteration (to sericite and clay minerals) of the alkali feldspar phenocrysts (stage 6). Quartz grains are not altered during these stages of weathering, but disaggregate and reduce in size due to continual opening-up of grain boundaries and micro-cracks. Increasing stages of weathering are marked by decreasing dry unit weights, dry densities and uniaxial compressive strengths, but increasing apparent porosities. The transition between ‘rock’ and ‘soil’ occurs during stage 6 when all plagioclase, and most alkali feldspar, groundmass grains have been altered as are some alkali feldspar phenocrysts. Stage 6 is marked by large apparent porosities (>18%) but low values of dry unit weight (<20.81 kN/m3), dry density (<2,122 kg/m3) and uniaxial compressive strength (<1.8 MPa).","PeriodicalId":272380,"journal":{"name":"Warta Geologi","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131293000","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

Groundwater Exploration Using Vertical Electrical Sounding And 2D Electrical Resistivity Tomography In Shale Formation: A Case Study Of Sabongida, Plateau State, North Central Nigeria 利用垂直电测深和二维电阻率层析成像技术在页岩地层中勘探地下水:以尼日利亚中北部高原州Sabongida为例

Warta Geologi Pub Date : 2022-04-28 DOI: 10.7186/wg481202202

S. Yusuf, Hilnan Christopher Drenkat, Charity Mamza Azi

{"title":"Groundwater Exploration Using Vertical Electrical Sounding And 2D Electrical Resistivity Tomography In Shale Formation: A Case Study Of Sabongida, Plateau State, North Central Nigeria","authors":"S. Yusuf, Hilnan Christopher Drenkat, Charity Mamza Azi","doi":"10.7186/wg481202202","DOIUrl":"https://doi.org/10.7186/wg481202202","url":null,"abstract":"Sabongida is characterized by lots of abortive boreholes which are often shallow as a result of the complex nature of shale formation in the area and limited application of integrated geophysical techniques before drilling of boreholes. The presence of shale formation in the area makes it extremely difficult to drill productive boreholes, while the existing hand dug wells are always shallow due to the difficulty in digging deeper wells, this and other factors motivated the choice of the study location for the purpose of proffering solutions to solve the perennial water problem in the area. Twenty-two (22) vertical electric soundings data (VES) using Schlumberger array with the aid of Ohms mega resistivity meter were conducted with electrode spread of AB/2 = 215 m and eleven (11) 2D electrical resistivity tomography data (ERT) using ADMT – 600 S - X equipment were acquired. ERT was conducted using 20 m as the length of each profile with 300 m in 10 profile lines and 400 m as the depth of probing. The result of the VES interpretation shows three to five geo-electric layers while the geo-electric section revealed the aquifers to consist of sandstones with varying thicknesses. Two groundwater potential zones were delineated as shelly sandstones and clayey sand. The different color band indicates the different layers within the ground as the soil resistivity varies, blue indicates low resistivity values, green - yellow indicates moderate resistivity values while high resistivity values are brown - red. The results from the 2D images indicate the low resistivity regions, suggesting aquifer is within the depths of 150 to 300 m. Thus, the recommended depths for drilling of productive boreholes are 180 to 210 m and 270 to 300 m in Sabongida.","PeriodicalId":272380,"journal":{"name":"Warta Geologi","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130425985","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

On The Supposed Onshore Extension Of The Penyu Basin, Peninsular Malaysia 论马来西亚半岛Penyu盆地的陆上延伸

Warta Geologi Pub Date : 2021-12-29 DOI: 10.7186/wg473202102

M. Madon

引用次数: 0

Lenggong Valley – Revisit Our National Treasure 冷公谷——重温国宝

Warta Geologi Pub Date : 2021-12-29 DOI: 10.7186/wg473202103

Eric Teng Jing Hang, M. H. Arifin

引用次数: 0

Soil Moisture Retention Characteristics Of Saprock From The Weathering Profile Over A Biotite-Muscovite Granite In Peninsular Malaysia 马来西亚半岛黑云母-白云母花岗岩风化剖面上腐石的土壤持湿特征

Warta Geologi Pub Date : 2021-12-29 DOI: 10.7186/wg473202104

J. K. Raj

{"title":"Soil Moisture Retention Characteristics Of Saprock From The Weathering Profile Over A Biotite-Muscovite Granite In Peninsular Malaysia","authors":"J. K. Raj","doi":"10.7186/wg473202104","DOIUrl":"https://doi.org/10.7186/wg473202104","url":null,"abstract":"The weathering profile at the slope cut near Km 16 of the Kuala Lumpur - Ipoh trunk road can be differentiated into an upper, 11.8 m thick pedological soil (zone I) and a lower, 31.9 m thick saprock (zone II) comprising silty sandy gravels that distinctly preserve the minerals, textures and structures of the original granite. In order to investigate the influence of particle size distributions on soil moisture retention characteristics, saprock samples were collected at depths of 26.53 m (Sample A), 31.29 m (Sample B) and 41.93 m (Sample C). Samples A and B, with porosities of 37%, comprise 33% gravel, 27% sand, 22% silt and 18% clay, and 31% gravel, 24% sand, 25% silt and 22% clay, respectively. Sample C with a porosity of 44% consists of 24% gravel, 28% sand, 38% silt and 10% clay. Tests with the pressure plate method show increasing suctions from 0 kPa through 0.98 kPa and 9.8 kPa to 33 kPa and 1,500 kPa to result in gravimetric soil moisture retentions of 31.9% through 28.6% and 23.3% to 16.9% and 6.8% in sample A, of 32.1% through 24.9% and 21.5% to 17.8% and 7.4% in sample B, and of 31.5% through 30.3% and 27.30% to 23.5% and 9.5% in sample C. Regression analyses of gravel, sand and clay contents plotted against moisture contents retained at high suctions (33 kPa and 1,500 kPa) yield negative trends with variable correlation coefficients (R2), though plots involving silt contents yield positive trends with large correlation coefficients (R2 >0.9966). It is concluded that adsorption of water on surfaces of silt sized particles (of mainly sericite derived from weathering of feldspars) that gives rise to the retention of soil moisture in saprock.","PeriodicalId":272380,"journal":{"name":"Warta Geologi","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128934614","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

The role of geophysics in the construction and stability assessment of tunnels 地球物理在隧道施工及稳定性评价中的作用

Warta Geologi Pub Date : 2021-12-29 DOI: 10.7186/wg473202101

Nik Adib Yaaziz, M. H. Arifin

引用次数: 0

Metamorphic rocks of the Kuching Zone Sarawak: Comment on Najiatun Najla Mohamad et al. (2020) The geology and stratigraphic framework of the Kuching Zone Sarawak: Current understanding and unresolved issues 沙捞越古晋带的变质岩:评论Najiatun Najla Mohamad等(2020)

Warta Geologi Pub Date : 2021-08-30 DOI: 10.7186/wg472202104

H. Breitfeld, R. Hall

引用次数: 0

Estimation of Dar-Zarrouk parameters and delineation of groundwater potential zones in Karlahi, part of Adamawa Massif, Northeastern Nigeria 尼日利亚东北部阿达马瓦地块Karlahi地区Dar-Zarrouk参数估算及地下水潜力带圈定

Warta Geologi Pub Date : 2021-08-30 DOI: 10.7186/wg472202101

S. Yusuf, J. Ishaku, W.M. Wakili

{"title":"Estimation of Dar-Zarrouk parameters and delineation of groundwater potential zones in Karlahi, part of Adamawa Massif, Northeastern Nigeria","authors":"S. Yusuf, J. Ishaku, W.M. Wakili","doi":"10.7186/wg472202101","DOIUrl":"https://doi.org/10.7186/wg472202101","url":null,"abstract":"Karlahi is largely underlain by granites and migmatites gneiss of the Adamawa Massif. The area lies west of Benue Trough and east of Cameroon volcanic line. The aim of this paper is to determine hydraulic properties of water bearing layer using parameters derived from Dar-Zarrouk equation and characterized them into groundwater potential zones. The resistivity values of the weathered and slightly weathered layers which make up the water bearing layers were added and an average was taken and used as the resistivity of the water bearing formation in computation of Dar-Zarrouk parameters in Karlahi area. The values of resistivity of water bearing formation ranged from 18 to 4963 Ωm with an average resistivity value of 549 Ωm and the thickness of the water bearing formation ranges from 21 to 32 m with an average thickness of 24.5 m. Conductivity values range from 0.000201 to 0.05509 (σ) while the longitudinal conductance range from 0.00483 to 1.2363 Ω-1, the transverse resistance ranges from 407 to 123504.3 Ωm2. The hydraulic conductivity and transmissivity values range from 0.14 to 25.87 m/day and 3.28 to 580.4 m2/day respectively. The longitudinal conductance values in Karlahi area revealed poor to good with an average longitudinal conductance value that is moderate. High transverse resistance values are located in the central and southern part of Karlahi area while low values are located in the eastern part. The spatial distribution map of transmissivity in the area revealed moderate to high transmissivity values in the north central part and a negligible to low transmissivity in southern part, extreme northeastern part. The groundwater potential map of Karlahi area shows negligible to weak potential groundwater zones in SW and SE, moderate potential in the central to northern part of Karlahi area.","PeriodicalId":272380,"journal":{"name":"Warta Geologi","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127425320","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

Saturated hydraulic conductivity (Ks) of earth materials in a weathering profile over the Kuantan Basalt, Pahang, Malaysia 马来西亚彭亨关丹玄武岩风化剖面中土物质的饱和水力导率(Ks)

Warta Geologi Pub Date : 2021-08-30 DOI: 10.7186/wg472202102

J. K. Raj

{"title":"Saturated hydraulic conductivity (Ks) of earth materials in a weathering profile over the Kuantan Basalt, Pahang, Malaysia","authors":"J. K. Raj","doi":"10.7186/wg472202102","DOIUrl":"https://doi.org/10.7186/wg472202102","url":null,"abstract":"Three broad morphological zones can be differentiated at the weathering profile; the top, 3.80 m thick, pedological soil (zone I with sub-zones IA, IB and IC) comprising soft to stiff, brown clays and the bottom bedrock (zone III) being an outcrop of vesicular olivine basalt. The intermediate zone II (saprock) is 1.12 m thick and consists of brown, very stiff, sandy clayey silt with many lateritic concretions. Laboratory constant head permeability tests show the saturated hydraulic conductivity (Ks) to vary with depth; sub-zone IB having a conductivity of 0.007 cm/hr, and sub-zone IC (saprolite), and zone II (saprock), having conductivities of 0.147, and 0.447, cm/hr, respectively. The conductivity values show no correlation with physical properties of the earth materials, but increase with increasing sand, gravel, and silt, contents. The conductivity values also decrease with increasing clay and colloid contents. The low hydraulic conductivity of sub-zone IB will lead to surface runoff and ponding over natural ground surfaces during rainfall events, though over disturbed ground surfaces, infiltration is anticipated in view of exposed saprolite and saprock earth materials with relatively high conductivity","PeriodicalId":272380,"journal":{"name":"Warta Geologi","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114184718","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