Warta Geologi最新文献_第3页

Geological sketches – out of time and fashion, but obsolete? An Essay 地质素描——不合时宜，但过时了?一篇文章

Warta Geologi Pub Date : 2021-08-30 DOI: 10.7186/wg472202103

F. Kessler

引用次数: 0

First discovery of Stegodon (Proboscidea) in Malaysia 马来西亚首次发现剑齿龙

Warta Geologi Pub Date : 2020-12-31 DOI: 10.7186/WG463202004

R. Muhammad, Tze Tshen Lim, Norliza Ibrahim, M. Razak, Fakhrulradzi Mohd Razif, Zarris Kem, Boon Tat Ching

{"title":"First discovery of Stegodon (Proboscidea) in Malaysia","authors":"R. Muhammad, Tze Tshen Lim, Norliza Ibrahim, M. Razak, Fakhrulradzi Mohd Razif, Zarris Kem, Boon Tat Ching","doi":"10.7186/WG463202004","DOIUrl":"https://doi.org/10.7186/WG463202004","url":null,"abstract":"A cheek tooth of Stegodon, an extinct genus of Proboscidea, had been discovered in a cave in Gopeng, Perak. The discovery represents the first fossil of Stegodon ever found in Malaysia. Embedded in lithified cave infillings are the associated dental remains from at least three or four other different taxa of fossil mammals commonly found among Southeast Asian Pleistocene-Holocene faunas. The finding provides a unique chance for investigations into the evolution dynamics of Stegodon in this part of Southeast Asia and the species diversity of Proboscidea in prehistoric Peninsular Malaysia. Fossil mammal assemblages from different phases of Pleistocene-Holocene period collected from karstic caves in Peninsular Malaysia, when considered with similar assemblages from other parts of Southeast Asia, have the potential to contribute to our understanding of prehistoric faunal migrations and species compositional changes among the biogeographic (sub)divisions in Southeast Asia. This may ultimately lead to a better knowledge of the possible paleoenvironmental and paleoclimatic fluctuations that influenced patterns of migration and adaptive responses of mammalian faunas in Quaternary Southeast Asia.","PeriodicalId":272380,"journal":{"name":"Warta Geologi","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125851736","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

Study On Beneficiation Of Silica Sand By Wet High-Intensity Magnetic Separators (WHIMS) And Reverse Flotation Technique For Glass Application: A Case Study From Sihanoukville, Cambodia 湿式强磁选机选矿二氧化硅砂及反浮选工艺在玻璃中的应用研究——以柬埔寨西哈努克市为例

Warta Geologi Pub Date : 2020-12-31 DOI: 10.7186/WG463202007

R. Sochea, S. Somsak, A. Numprasanthai

引用次数: 1

Identification Of Unconfined Aquifer Using 3D Resistivity Analysis At Simpang 5 Area, Semarang, Central Java, Indonesia 利用三维电阻率分析识别印尼中爪哇三宝垄Simpang 5区无承压含水层

Warta Geologi Pub Date : 2020-12-31 DOI: 10.7186/WG463202005

S. Supriyadi, Fianti Fianti, R DwiRizki, A. Setyawan, Ronaldo Talapessy

{"title":"Identification Of Unconfined Aquifer Using 3D Resistivity Analysis At Simpang 5 Area, Semarang, Central Java, Indonesia","authors":"S. Supriyadi, Fianti Fianti, R DwiRizki, A. Setyawan, Ronaldo Talapessy","doi":"10.7186/WG463202005","DOIUrl":"https://doi.org/10.7186/WG463202005","url":null,"abstract":"Water is a unique property of the Earth and very important to every living organism. The existence of groundwater is only 0.61% of the total water on earth (oceans, rivers, lakes, polar ice, rain). The purpose of this research is to determine the location and depth of the aquifer by using 2D and 3D modeling. The method of research is resistivity method using Schlumberger configuration, where data is collected according to the survey design with coordinate ranging from X:436100, Y:9226880 to X:436680, Y:9227640, and covered by 7 lines. The modeling results indicate that the present groundwater aquifer potential has low resistivity distribution in this area. The spreading of unconfined aquifer is estimated on the north side to the east of Simpang 5 area. This can be seen from syncing the data of line one to six. But the data on line seven is of different patterns with other lines. The existence of groundwater basin is not easily identified on this line. This may be due to the location of Line Seven being located in the area of Ciputra Mall, Horison Hotel and Tlogorejo Hospital with higher consumption of water, thus the decrease in groundwater condition. This may cause conditions such as land subsidence. The results of interpretation based on the modeling show the possibility of an unconfined aquifer with groundwater level at 10-15 m depth with varied end of border groundwater depth.","PeriodicalId":272380,"journal":{"name":"Warta Geologi","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127862554","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

X-Ray Diffraction (XRD), X-Ray Fluorescence (XRF) And Scanning Electron Microscopy (SEM) Analysis Of Potsherds, Sungai Batu Complex, Bujang Valley, Kedah Sungai Batu Complex, Bujang Valley, Kedah

Warta Geologi Pub Date : 2020-12-31 DOI: 10.7186/WG463202006

M. H. A. Halim, M. Saidin

引用次数: 0

Discovery of agate geode and nodules at Mount Conner, Semporna, Sabah 在沙巴州仙本那的康纳山发现玛瑙晶洞和结核

Warta Geologi Pub Date : 2020-12-31 DOI: 10.7186/WG463202003

E. James, H. F. W. S. Erfen, A. Ghani, Angela Vidda Chuwat, Gerald Eko Ejiga, T. E. Garba

{"title":"Discovery of agate geode and nodules at Mount Conner, Semporna, Sabah","authors":"E. James, H. F. W. S. Erfen, A. Ghani, Angela Vidda Chuwat, Gerald Eko Ejiga, T. E. Garba","doi":"10.7186/WG463202003","DOIUrl":"https://doi.org/10.7186/WG463202003","url":null,"abstract":"An exposure of agate geode and nodules in Mount Conner, Sabah, provides an essential aspect to the geological formation in Semporna. This paper briefly report results from petrography analyses on the agate geode and nodules and its significance to the volcanic rocks and sedimentary rocks formation in Mount Conner. The geode and nodules can be divided into agate, and nodules and most of them are sub-rounded. Nodules are usually small in size and display brownish colour. It commonly occurs in volcanic rocks (dacite and rhyolite) and contained amygdale filled by secondary mineral such as microcrystalline and macrocystalline quartz. In contrast, sedimentary rocks in Mount Conner contain both nodules and geodes, which nodules shows similar characteristic with nodules in volcanic rocks and geodes contained empty vesicles or spaces surrounded by colourless to milky white quartz crystals. Both geode and nodules exhibit conchoidal fracture, while geode shows vesicle features and nodules in volcanic rocks show amygdale texture. The formation of geodes and nodules in Mount Conner might as result of precipitation under low temperature from hydrothermal solution.","PeriodicalId":272380,"journal":{"name":"Warta Geologi","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114145162","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

High Resistivity Reservoirs (Causes And Effects): Sahara Field, Murzuq Basin, Libya 高电阻率油藏(成因和影响):利比亚Murzuq盆地撒哈拉油田

Warta Geologi Pub Date : 2020-12-31 DOI: 10.7186/WG463202011

Abubaker Alansari, A. Salim, A. Rahman, N. Fello, Hammad Janjujah

{"title":"High Resistivity Reservoirs (Causes And Effects): Sahara Field, Murzuq Basin, Libya","authors":"Abubaker Alansari, A. Salim, A. Rahman, N. Fello, Hammad Janjujah","doi":"10.7186/WG463202011","DOIUrl":"https://doi.org/10.7186/WG463202011","url":null,"abstract":"High and low resistivity values is an alarming phenomenon that is usually associated with a very complicated reservoir history and worth looking into. Ordovician sandstone reservoirs are the primary oil producers in the Murzuq basin oil fields that is characterized with an average porosity of 14%, permeability range 410-10,760 md and clean quartz aranite composition. More than fifty wells were drilled in Sahara oil field, but only four of them were announced to have high resistivity values more than 100k ohm-m and ten others to be considered as low resistivity wells (below 50 ohm-m). Therefore, average deep resistivity was mapped in both water and oil legs using all available data set, and the top reservoir was employed as a trend map. They showed distinctive trends for low resistivity readings in oil-leg and confirmed the extreme deep resistivity nature for the wells (W7, W8, W9, and W10). Height above oil water contact and capillary pressure was also calculated for all the wells and revealed a high pressure (400 psi) at the location of the high resistivity wells. As a result, of higher capillary pressure in thicker reservoir area oil might have been able to displace water through geological time by benefitting of more considerable height above oil-water contact, higher connate pressure, and buoyancy forces support, which resulted in occupying all the larger pores and pushed the water into minor scattered pores leading to gradual alteration of reservoir wettability from water to oil-wet. Hence, the brine fluids will no longer be connected to each other inside the pore system. Therefore, they will lose their contribution to resistivity readings, and the resistivity tool will encounter a more resistant medium, which in turn will lead to underestimation of water saturation.","PeriodicalId":272380,"journal":{"name":"Warta Geologi","volume":"113 19","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120851902","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 Potential Assessment Using 2-D Resistivity Method In Kluang, Johor (Malaysia) 利用二维电阻率法评价马来西亚柔佛州Kluang地区地下水潜力

Warta Geologi Pub Date : 2020-12-31 DOI: 10.7186/WG463202009

Nazrin Rahman, E. T. Mohamad, R. Saad

{"title":"Groundwater Potential Assessment Using 2-D Resistivity Method In Kluang, Johor (Malaysia)","authors":"Nazrin Rahman, E. T. Mohamad, R. Saad","doi":"10.7186/WG463202009","DOIUrl":"https://doi.org/10.7186/WG463202009","url":null,"abstract":"Sources of clean water are decreasing due to rapid usage, contaminated surface waters, pollution and dry season. The dependence on the existing water source is not enough to fulfil the increasing demand of population in Malaysia. In order to overcome the problem, groundwater source is the most suitable alternative. 2-D resistivity method was carried out in a granitic area of Kluang, Johor to delineate and locate groundwater resource. 5 survey lines were conducted by using ABEM SAS4000 terrameter and electrode selector which were connected to 41 electrodes through lund cables. Pole-dipole array was chosen in this study for deeper penetration. Collected data were processed by using RES2DINV software to produce inversion model which was then exported to Surfer8 software for visualisation and interpretation. The result shows that most of the study area consist of granite with different level of fracturing. Unconfined aquifer was found at depths of 0 to 50 m. Confined aquifers can be seen at two different zones. They exhibit same properties at three parallel lines, R1-R3 and show continuity between them. It is predicted that the aquifers flow in the southwest to northeast direction. The hard rock aquifers are highly recommended to be drilled as they contain a large amount of fresh water for further usage.","PeriodicalId":272380,"journal":{"name":"Warta Geologi","volume":"23 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131840643","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

Variation In Textural Properties Of Aplitic Kaolin From Kinta Valley 金塔谷应用高岭土织构特性的变化

Warta Geologi Pub Date : 2020-12-31 DOI: 10.7186/WG463202008

L. Khong, H. Zabidi, K. Ariffin

{"title":"Variation In Textural Properties Of Aplitic Kaolin From Kinta Valley","authors":"L. Khong, H. Zabidi, K. Ariffin","doi":"10.7186/WG463202008","DOIUrl":"https://doi.org/10.7186/WG463202008","url":null,"abstract":"Textural properties are among one of the fundamental characteristics especially important to be understood before suitable application(s) of a kaolin can be determined as they have direct influence on the other properties such as plasticity, brightness, firing and rheological behavior. This paper presents an investigation on the textural properties of aplitic kaolin from Kinta Valley. Two degritted kaolin samples from different location of Kinta Valley were measured for their particle size distribution by laser diffraction method. The samples were then classified into different size fractions followed by examination of their morphological property by various techniques which X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and field emission scanning electron microscope (FESEM). Generally, the kaolin can be classified into two different types based on the fine fraction content which may be consists of; i) delaminated platy kaolinite, or ii) tubular shaped halloysite. These fine fractions however constitute only to minor amount or not more than 12 % of the clays, as both clay consist predominantly of coarse book like kaolinite stacks. The degree of crystallinity of kaolinite samples shows a positive correlation to its particle size during examination by XRD, but FTIR spectrum shows a high degree of crystallinity for all kaolinite samples regardless of their particle size. Slight presence of halloysite is sufficient to give an adverse effect on the clay crystallinity index measured from XRD pattern. Sorting of the clay into different size and morphological fraction creates a product with less variation in properties between individual particles, and with more potential for tailoring or engineering of their properties.","PeriodicalId":272380,"journal":{"name":"Warta Geologi","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128329309","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

Residual shear strength of shales from the Gemas Formation based on ring shear tests 基于环剪试验的Gemas组页岩残余抗剪强度

Warta Geologi Pub Date : 2020-12-31 DOI: 10.7186/WG463202001

J. K. Raj

{"title":"Residual shear strength of shales from the Gemas Formation based on ring shear tests","authors":"J. K. Raj","doi":"10.7186/WG463202001","DOIUrl":"https://doi.org/10.7186/WG463202001","url":null,"abstract":"Fresh, dark grey to black, shales with minor sandstones of the Triassic Gemas Formation outcrop at the slope cut between Km 81.30 and 81.05 (southbound) of the North-South Expressway near Ayer Hitam in Johore State. The beds strike 165o with eastward dips of 35o to 43o and have thickness of between 0.2 and 1.5 m. Over-lying the fresh bedrock along an irregular boundary is a bleached zone, some 14 to 18 m thick, comprising light grey to white, in situ oxidized shales and sandstones. Three samples were collected from a thick shale bed; fresh samples A and B at 18 m and 15 m depth, respectively, and a bleached shale sample C at 11 m depth. All samples were air dried, finely ground, and then passed through a wire mesh sieve with 180 μm aperture sieve. The remoulded samples were tested with the Bromhead ring shear apparatus, employing the pre-shearing test procedure with multi-stage loading. Plots of shear stress versus cumulative horizontal shear displacement under low normal stresses (<150 kPa) yield failure envelopes with residual friction angles of 27.4o, 27.4o and 27.9o for samples A, B, and C, respectively. Under moderate to large normal stresses (150-350 kPa), plots of shear stress versus linear displacement sometimes slope upward due to increased friction as a result of sample extrusion and settlement of the top platen. It is concluded that the pre-shearing test procedure with multi-stage loading is best suited for low to moderate, effective normal stresses (<250 kPa). Based on the test results, the residual friction angle for shales from the Gemas Formation is between 27o and 28o.","PeriodicalId":272380,"journal":{"name":"Warta Geologi","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133810768","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