Earth Science Research最新文献_第9页

Lithostructural and Petrochemical Survey of Djarkadougou Gold Prospect (South West Burkina Faso / West Africa) Djarkadougou金矿远景区(布基纳法索西南部/西非)岩石构造与石化勘探

Earth Science Research Pub Date : 2017-02-06 DOI: 10.5539/ESR.V6N1P155

Y. Koffi, S. C. Djro, U. Wenmenga

{"title":"Lithostructural and Petrochemical Survey of Djarkadougou Gold Prospect (South West Burkina Faso / West Africa)","authors":"Y. Koffi, S. C. Djro, U. Wenmenga","doi":"10.5539/ESR.V6N1P155","DOIUrl":"https://doi.org/10.5539/ESR.V6N1P155","url":null,"abstract":"The Djarkadougou gold prospect is located on the Birimian greenstone belt of the Hounde exploration permit held by the company Orezone Inc. The permit is at 275 km far from the capital Ouagadougou south- western Burkina Faso, West Africa. This area is based on sheared and metamorphosed greenschist facies rocks. Metamorphism locally reaches to the amphibolite facies around intrusions. There are two major lithological units whose interface is marked by a NW-SE trending shear corridor: an unit of andesite-basaltic rocks of andesitic breccias in the East and volcaniclastic and sedimentary unit composed flows, tuffs and felsic to mafic breccia, interbedded volcano-sedimentary rocks. All this together is intruded by plutonic rocks, and various felsic to mafic dykes. These rocks have undergone ductile to brittle heterogeneous deformations and hydrothermal alteration sericite ±carbonate ±quartz±sulphide within deformation corridors. The rocks of the East and West domains affected by three phases of brittle-ductile deformation (D1, D2, and D3) and the meteoric alteration is systematic in superficial facies of Djarakadougou core drilling.Geochemical analysis shows a tholeiitic to calc-alkaline volcanic serie characteristic a bimodal volcanism. The spectra of normalized REE chondrites are generally flat and constant reminding those of N-MORB basalt. The chemical compositions of andesite and basalt are deferred on several discrimination diagrams especially Th / Yb - Nb / Yb and 2 Nb - Zr / 4 - Y show that andesites and basalts of the prospect are issued in geotectonic setting of volcanism preponderant arc.","PeriodicalId":11486,"journal":{"name":"Earth Science Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82596324","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

Spatial Mapping of Carbon Stock in Riverine Mangroves Along Amanzule River in the Ellembelle District of Ghana 加纳Ellembelle地区Amanzule河沿岸红树林碳储量的空间映射

Earth Science Research Pub Date : 2017-01-31 DOI: 10.5539/ESR.V6N1P120

L. L. Yevugah, E. M. O. Jnr., J. Ayer, Joshua Osei Nti.

{"title":"Spatial Mapping of Carbon Stock in Riverine Mangroves Along Amanzule River in the Ellembelle District of Ghana","authors":"L. L. Yevugah, E. M. O. Jnr., J. Ayer, Joshua Osei Nti.","doi":"10.5539/ESR.V6N1P120","DOIUrl":"https://doi.org/10.5539/ESR.V6N1P120","url":null,"abstract":"Compared to other wetland ecosystems mangroves are well known for their numerous ecosystem services, especially carbon pool. In Ghana, there is limited information on the sequestered carbon in mangroves. There is increasing interest on national climate change mitigation and adaptation plans in mangroves in developing nations, and Ellembelle in the Western Region of Ghana is of no exception. Ellembelle is one of the areas with little information on the size and variation of mangrove carbon stock which needs to be addressed. This research is aimed at determining the carbon stock from the carbon sequestered in mangrove and the areal extent in mangrove forest using remote sensing and allometric equation. The ecosystem carbon density estimate for the mangrove forest was weighted based on their spatial distribution across the landscape to yield a total carbon stock of for the Ellembelle mangrove forest. The error obtained from the 95% Confidence Interval was + 1.53%, which is within the acceptable levels of uncertainty based on the Monte Carlo Analysis. The overall carbon estimated for 2015 based on the area for mangrove (374.49 ha) was 1.550Mt with an uncertainty of + 57.125Kt indicating a high amount of carbon sequestered in mangroves.","PeriodicalId":11486,"journal":{"name":"Earth Science Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74964670","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

Study of Characteristics of Surface Subsidence in Longwall Coal Mine under Poor Ground Conditions in Indonesia 印度尼西亚恶劣地面条件下长壁煤矿地表沉降特征研究

Earth Science Research Pub Date : 2017-01-31 DOI: 10.5539/ESR.V6N1P129

P. Pongpanya, T. Sasaoka, H. Shimada, Sugeng Wahyudi

{"title":"Study of Characteristics of Surface Subsidence in Longwall Coal Mine under Poor Ground Conditions in Indonesia","authors":"P. Pongpanya, T. Sasaoka, H. Shimada, Sugeng Wahyudi","doi":"10.5539/ESR.V6N1P129","DOIUrl":"https://doi.org/10.5539/ESR.V6N1P129","url":null,"abstract":"This paper aims to study the characteristics of surface subsidence induced by longwall mining under poor ground conditions in Indonesia by means of numerical simulation techniques using finite difference code “FLAC3D”. The effect of mining depth in cases of single panel and multi-panel longwall mining, the influence of panel and pillar widths, and the impact of backfilling material, were incorporated into the FLAC3D software. The simulated results indicated that the angle of draw and maximum surface subsidence were significantly associated with the depth of mining, the number of extracted panels, the width of panel and pillar, and the type of backfill. In single panel mining, the largest maximum surface subsidence is observed in case of the shallowest mining depth, and it gradually decreases as the depth increases. In contrast, the angle of draw increases with increasing the mining depth. In multi-panel mining, the angle of draw and maximum surface subsidence increase as the mining depth increases. Moreover, the angle of draw and maximum surface subsidence decrease when the narrow panel and large pillar widths are adopted, and the backfilling materials are applied.","PeriodicalId":11486,"journal":{"name":"Earth Science Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75969612","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

Optimization of Abstraction Wells near Coastal Zone 近岸抽采井优化设计

Earth Science Research Pub Date : 2016-12-31 DOI: 10.18005/JESR0401004

H. Abu-Bakr, Mustafa Elkhedr, T. Hassan

引用次数: 4

Network Data Model to Transport Network Analysis Through Geographical Information System Techniques A Case Study of English Bazar Municipality (Malda), West Bengal in India 通过地理信息系统技术进行运输网络分析的网络数据模型——以印度西孟加拉邦英国巴扎尔市(马尔达)为例

Earth Science Research Pub Date : 2016-12-31 DOI: 10.18005/JESR0401006

P. Ghosh

引用次数: 0

Regional Differences of Hypsometry in Reference to Geotectonic and Geomorphometric Vectors in Atreyee River Basin of Indo-Bangladesh 基于大地构造和地貌矢量的印度-孟加拉国Atreyee河流域地形拟合的区域差异

Earth Science Research Pub Date : 2016-12-31 DOI: 10.18005/JESR0401003

T. Saha, Surjya K. Pal

引用次数: 1

Segmented Parametric Estimates of the Sea State Bias for Radar Altimeters 雷达高度表海况偏差的分段参数估计

Earth Science Research Pub Date : 2016-12-31 DOI: 10.18005/JESR0401002

Guoshou Zhang, H. Miao, Guizhong Wang, Yingting Guo, Yujie Jing

引用次数: 0

Management of the Test Site/In-Situ Data Integrated into Space Information 试验场/原位数据与空间信息集成的管理

Earth Science Research Pub Date : 2016-12-30 DOI: 10.18005/JESR0401001

Nargiz E. Samadova, R. Rustamov

引用次数: 3

Integrated Characterization of Toxicity Distribution of Selected Heavy Metals in Stream Sediments Around Itakpe Iron Ore Mines, North Central Nigeria 尼日利亚中北部Itakpe铁矿附近水系沉积物中部分重金属毒性分布的综合表征

Earth Science Research Pub Date : 2016-12-27 DOI: 10.5539/ESR.V6N1P109

E. Ameh, Ojochogwu Sunday Idakwo, Ojone Caroline Ameh, Omojo Mercy Lekdukum

{"title":"Integrated Characterization of Toxicity Distribution of Selected Heavy Metals in Stream Sediments Around Itakpe Iron Ore Mines, North Central Nigeria","authors":"E. Ameh, Ojochogwu Sunday Idakwo, Ojone Caroline Ameh, Omojo Mercy Lekdukum","doi":"10.5539/ESR.V6N1P109","DOIUrl":"https://doi.org/10.5539/ESR.V6N1P109","url":null,"abstract":"The results of the analysis were subjected to five (5) indices: contamination factor (CF); Ecological risk factor (Er i ); Enrichment factor (EF); index of geo-accumulation (Igeo) and anthropogenic factor (AF). The CF results showed that the River PomPom dry and wet season sediments were collected in February and July respectively from 0cm to 10cm depth. Stainless steel spoon was used to collect the samples. The sediment samples were packaged, labeled and refrigerated for onward transportation to the laboratory. All samples were oven-dried (50 o C) for about 24 hours, sieved through -80 mesh. About 1.0g of each sample was digested, filtered and the filtrates were ready for heavy metal analysis using Atomic sediments were most contaminated with Fe in both seasons, least contaminated with Cd at dry season and Zn in wet season. The Er i factor revealed pollution hazard level of middle during wet season and tiny in dry season. Pb and Ni showed strong and middle hazard level during wet season and Cu revealed middle level during dry season. The enrichment factor indicated extremely enriched for Fe in all locations in both seasons while most heavy metals showed depletion to minimal enrichment. The Igeo for both seasons showed that Fe was moderately to highly polluted in all locations. During dry season, other heavy metals showed moderately to unpolluted while in wet season Cd, Ni and Pb indicated moderately to very highly polluted. In both seasons, the % AF was very high for Fe, Cu, Pb. The AF% was very high for Ni and Cd in wet season. All sites in both seasons have experienced deterioration but more in the wet season. From these indices, the stream sediments have been significantly contaminated with Fe, Ni, Pb and Ni in most locations in both seasons.","PeriodicalId":11486,"journal":{"name":"Earth Science Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87111483","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

Supercooling of Seawater Near the Glacier Front in a Fjord 峡湾冰川锋附近海水的过冷现象

Earth Science Research Pub Date : 2016-12-27 DOI: 10.5539/ESR.V6N1P97

A. Marchenko, E. Morozov, N. Marchenko

引用次数: 4