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DOI: http://dx.doi.org/10.18686/ag.v0i0

Online First, the immediate online pre-published of all accepted papers. Articles in Online First are these have been initially reviewed, initially accepted and initially typeset. But they haven’t being peer-viewed and proofreaded, also, the final date of publication hasn’t been scheduled. Individual articles and its content may differ from the final version of publication, subject to the final version.

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Articles

by MOHAMMAD SHAHI FERDOWS 1
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Enhancement of anomaly plays such a critical role in mineral exploration that this work has been carried out by removed noise in geophysical data. Power spectrum area (S-A) and multifractal singular value decomposition (MSVD) methods are application methods in enhancement of anomaly that are usually used in the geochemical exploration process. However, these methods have not been widely used in the geoelectrical data so far. Hamyj deposit is located about 80 kilometers west of Birjand city, South Khorasan province, Iran. In this area, resistivity and induced polarization data have been surveyed by dipole- dipole array. In this paper, IP data has been inversed by the linear method. Then, enhancement of anomaly IP data has been carried out by S-A and MSVD methods. Results of S-A and MSVD methods were compared with each other. Results indicate that the S-A method has determined the location of anomaly IP data better than the MSVD method.
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Articles

by ABDUL SAMAD ABDUL RAHMAN 1, Juhaizad Ahmad 1, Norbaya Sidek 1, Norhazwani Md Zain 1, Mohd Ikmal Fazlan Rosli 1
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Nowadays, peoples are more concern about the environment impact assessment towards sustainable development. For that reason, this research is focusing on the effect of the usable daily cooking oils which easily thrown into the soil in the backyard. Furthermore, the stabilization of a foundation in a building mainly depends on the shear strength of soil especially when it’s been soaked into the water for a long period of time. Due to that, the mixing of oil with water in the soil may lead to reduction in shear strength and thus will lead to failure in a foundation of structures. A studied were carried out to investigate the effect of mixing samples with usable cooking oil with 3% and 5% into the laterite soil under the condition of unsoaked and soaked for 14 days using multistage triaxial consolidated drained test. From the results, it’s show that there is significant reduction in shear strength for control samples and with the mixing of 3% and 5% oil for unsoaked and soaked condition in 14 days. For control sample under unsoaked condition compare to the sample that mix with 3% and 5% of usable cooking oil under the same condition, about 6° of effective friction angle were deduced. Meanwhile for control sample that been soaking compare to 3% mixing, the shear strength was deduced about 6° and for 5% mixing, the shear strength was 9°. In the end, results show that reduction in shear strength will continuously decreased with the increase of the quantities of usable cooking oil and thus will reflect towards the failure of a foundation.

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Articles

by Rongliang Zhang, Enpu Gong, Guoku Wang, Weiya Peng
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After the exploration and research of Lateritic-Gibbsite bauxite for years in Guinea, based on factors such as paleoclimate, paleogeography and parent rocks, the laterization and bauxite mineralization process of lateritic gibbsite bauxite in Guinea were analyzed. The mineralization conditions and topography were favorable for the formation of bauxite deposits on the West Africa craton of NW Africa, especially in Guinea. Through chemical and phase analysis for mineralogy and petrology of different mining area in BOKE-SANGAREDI of Guinea, the mineralization characters of different minerals were analyzed. Due to the paleoclimate and paleogeographical conditions, the parent rocks were leached of certain major elements, such as Si, K, Na, Ca and Mg. However, some elements, such as Al, Fe, and Ti, became relatively concentrated. Based on composition analyses of the bauxite and surrounding rocks, the laterization and bauxite mineralization processes are evaluated in the Boke-Sangaredi area of Guinea.

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Articles

by Desmond Fitzgerald Lascelles 1
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Crustal evolution recommenced after the Late Heavy bombardment caused melting and mixing of the Hadean crust. Upwelling hot mantle spread out carrying the colder brittle crust away from the upwelling current causing rifts and lateral movement of crustal plates. Partial melting due to the reduction of pressure on the mantle generated magma that flowed through the rifts forming new crust while degassing of the magma produced the atmosphere and hydrosphere. New information from the Yilgarn craton in Western Australia indicates that where the lateral movement of converging plates intersected the crust was compressed into multi-kilometre scale folds. Partial melting at the base of the folded crust produced granodiorite and a dense ultramafic restite and the formation of an Archean style craton. The spreading mantle flow loses heat through the crust becoming denser and together with the restite sinks down through the mantle forming a convective cycle. When two cratons approach the intervening mafic crust is folded forming a new craton that joins the cratons into a continent. Mantle plumes rising beneath the continent cause rifts to open and the formation of new ocean crust in the rifts while older ocean crust is subducted beneath the outer margins of the continent.
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Articles

by Yinghong Qin 1, Jia Liang 1, Kanghao Tan 1, Fanghua Li 2
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Urban structures consist of buildings, roofs, walls and streets. Buildings at both sides of the street create a canyon-like environment that is called urban canyon (UC). In a UC, conventional impervious pavements absorb and store solar radiation but negate the evaporative cooling, contributing to the development of urban heat island (UHI). One popular option to mitigate UHI is to make the pavements more reflective than conventional pavements and to absorb less solar radiation in the urban area. However, it remains unknown if a reflective pavement in an urban canyon can effectively reduce the solar absorption of the urban surfaces. This study prepares ten UC prototypes with differential pavement reflectivity and with south-north orientation, west-east orientation, and cross-street orientation, respectively. The albedo of these UC prototypes is measured by a new method that is proposed to estimate the reflectivity of urban canyon prototypes. It is found that raising the albedo of the pavement is inefficient to increase the albedo of the UC, especially for UC with great aspect ratio. In low aspect-ratio UC or parking lot, reflective pavements reflect a sizable additional diffuse radiation to pedestrians. Therefore, it should be caution to develop reflective pavements as urban cooling strategy.
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Articles

by Ahmad Alvandi
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Magnetic anomalies depth determination techniques can significantly decrease the interpretation workload of a geophysicist and are widely used. In this paper, I use from Tilt-Depth method to provide information about the nature of the source from Magnetic survey. The method is tested using theoretical data and field model from Iran.

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