Pub Date : 2022-11-29DOI: 10.15446/esrj.v26n3.101477
Oldemar De Oliveira Carvalho-Junior
A long-term analysis of temperature can be used to describe the main mechanisms that operate at the surface of the ocean. The average sea surface temperature (SST) contour plots for the Indian Ocean are produced based on the World Ocean Atlas Data Set (1994). SST, together with the independent variables wind (Wx, zonal component of pseudo-stress wind and Wy, meridional component of pseudo-stress wind), net-down-fresh-water-flow (NDFF), and Ekman pumping, are included in a multiple regression analysis to define the relative importance of each one of these variables in the physical processes at the surface of the Indian Ocean. The NDFF data set is based on COADS (Comprehensive Ocean-Atmosphere Data Set). The wind data is obtained from the Florida State University (FSU). The harmonic terms of the variables are calculated, which is considered to be stationary and expressed by a Fourier series as a cosine function. The harmonic terms are multiplied by the maximum amplitude of the variables and then added to their mean annual values. The isotherms are mainly meridional along the western boundary, but zonal in the southern Indian Ocean. The annual component is seen to have a maximum in July, Summer Monsoon (SW Monsoon) and a minimum in January, during the Winter Monsoon (NE Monsoon). The amplitude of the semiannual component is smaller, with two maxima in May and October and two minima in February and August. The small magnitude of these residuals errors is an indication that the temperature variability during this period and for this area can be explained reasonably well by the two harmonic terms. In the Arabian Sea, the final regression equations for SST variability show that it is mainly affected by the Wx, Ekman pumping and NDFF. For most of the areas of the Bay of Bengal, as well as for most of the locations in the southern tropical Indian Ocean, the entered independent variables can explain SST. Two components fit to observation can be used to predict SST together with the regression equations. Although harmonic analysis can be used to study SST variability, a multiple regression analysis is required to identify and quantify the variables related to areas of large annual and semiannual variability. Different techniques are therefore used together to provide more reliable results in SST configuration in the Indian Ocean.
{"title":"Role of Ocean-Atmosphere Interface in Annual and Semiannual SST Cycles in the Indian Ocean","authors":"Oldemar De Oliveira Carvalho-Junior","doi":"10.15446/esrj.v26n3.101477","DOIUrl":"https://doi.org/10.15446/esrj.v26n3.101477","url":null,"abstract":"A long-term analysis of temperature can be used to describe the main mechanisms that operate at the surface of the ocean. The average sea surface temperature (SST) contour plots for the Indian Ocean are produced based on the World Ocean Atlas Data Set (1994). SST, together with the independent variables wind (Wx, zonal component of pseudo-stress wind and Wy, meridional component of pseudo-stress wind), net-down-fresh-water-flow (NDFF), and Ekman pumping, are included in a multiple regression analysis to define the relative importance of each one of these variables in the physical processes at the surface of the Indian Ocean. The NDFF data set is based on COADS (Comprehensive Ocean-Atmosphere Data Set). The wind data is obtained from the Florida State University (FSU). The harmonic terms of the variables are calculated, which is considered to be stationary and expressed by a Fourier series as a cosine function. The harmonic terms are multiplied by the maximum amplitude of the variables and then added to their mean annual values. The isotherms are mainly meridional along the western boundary, but zonal in the southern Indian Ocean. The annual component is seen to have a maximum in July, Summer Monsoon (SW Monsoon) and a minimum in January, during the Winter Monsoon (NE Monsoon). The amplitude of the semiannual component is smaller, with two maxima in May and October and two minima in February and August. The small magnitude of these residuals errors is an indication that the temperature variability during this period and for this area can be explained reasonably well by the two harmonic terms. In the Arabian Sea, the final regression equations for SST variability show that it is mainly affected by the Wx, Ekman pumping and NDFF. For most of the areas of the Bay of Bengal, as well as for most of the locations in the southern tropical Indian Ocean, the entered independent variables can explain SST. Two components fit to observation can be used to predict SST together with the regression equations. Although harmonic analysis can be used to study SST variability, a multiple regression analysis is required to identify and quantify the variables related to areas of large annual and semiannual variability. Different techniques are therefore used together to provide more reliable results in SST configuration in the Indian Ocean.","PeriodicalId":11456,"journal":{"name":"Earth Sciences Research Journal","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48278497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-29DOI: 10.15446/esrj.v26n3.96209
O. Verma, M. Prashanth, R. Greco, A. Khosla, Kulwant Singh
Geological education plays a major role in the social, economic, and cultural growth and development of any country. India is a vast diversified country with wide-ranging geological features, consisting of rocks of all geological ages with well-developed physiographic divisions. The Indian lithospheric plate is a storehouse of vast georesources and also serves as a natural field laboratory for developing and testing numerous geological principles. The exploration of Indian georesources began in the past; with the organized exploration began way back in the 1830s. The number of institutions offering geological education is, however, comparatively low. Thus, Geology as a science discipline is less popular in comparison with other science subjects such as Physics, Chemistry, Zoology, Botany, and Environmental science, based on enrolment data of the learners enrolled in academic sessions from 2011-2012 to 2018-2019 of the Master's degree programs. Analysis indicates that teaching-learning resources of foreign origin are dominantly being adopted as learning resources in the teaching-learning pedagogy of degree programs in Geology, and are over-riding those of Indian origin. The COVID-19 pandemic is affecting geological education in two ways namely, the disruption of conventional (face-to-face) teaching together with not allowing learners of Geology programs to complete their compulsory out-door geological fieldwork assignments. The analysis of data gathered by an online questionnaire survey shows that the use of indigenous open educational resources in Geology appears as a plausible solution to overcome the learning barriers created by the COVID-19 pandemic, and also to enrich teaching-learning resources of Indian origin. This article provides an up-to-date detailed account of the necessity and evolution of geological education, the current popularity of Geology as a science discipline, the nature of available geological teaching-learning resources, the impact of the COVID-19 on geological education, and the role of open educational resources in providing quality and equitable geological education, whilst removing educational barriers created by COVID-19 in India.
{"title":"Geological education scenario in India and role of open educational resources in the light of COVID-19 pandemic","authors":"O. Verma, M. Prashanth, R. Greco, A. Khosla, Kulwant Singh","doi":"10.15446/esrj.v26n3.96209","DOIUrl":"https://doi.org/10.15446/esrj.v26n3.96209","url":null,"abstract":"Geological education plays a major role in the social, economic, and cultural growth and development of any country. India is a vast diversified country with wide-ranging geological features, consisting of rocks of all geological ages with well-developed physiographic divisions. The Indian lithospheric plate is a storehouse of vast georesources and also serves as a natural field laboratory for developing and testing numerous geological principles. The exploration of Indian georesources began in the past; with the organized exploration began way back in the 1830s. The number of institutions offering geological education is, however, comparatively low. Thus, Geology as a science discipline is less popular in comparison with other science subjects such as Physics, Chemistry, Zoology, Botany, and Environmental science, based on enrolment data of the learners enrolled in academic sessions from 2011-2012 to 2018-2019 of the Master's degree programs. Analysis indicates that teaching-learning resources of foreign origin are dominantly being adopted as learning resources in the teaching-learning pedagogy of degree programs in Geology, and are over-riding those of Indian origin. The COVID-19 pandemic is affecting geological education in two ways namely, the disruption of conventional (face-to-face) teaching together with not allowing learners of Geology programs to complete their compulsory out-door geological fieldwork assignments. The analysis of data gathered by an online questionnaire survey shows that the use of indigenous open educational resources in Geology appears as a plausible solution to overcome the learning barriers created by the COVID-19 pandemic, and also to enrich teaching-learning resources of Indian origin. This article provides an up-to-date detailed account of the necessity and evolution of geological education, the current popularity of Geology as a science discipline, the nature of available geological teaching-learning resources, the impact of the COVID-19 on geological education, and the role of open educational resources in providing quality and equitable geological education, whilst removing educational barriers created by COVID-19 in India.","PeriodicalId":11456,"journal":{"name":"Earth Sciences Research Journal","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45623345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-29DOI: 10.15446/esrj.v26n3.103981
Carlos Alberto Vargas Jimenez, Juan M. Solano, A. Gulisano, S. Santillana, E. A. Casallas
Authors have calculated the H/V spectral ratios using seismic-noise recordings in the uppermost layers north of the Seymour-Marambio Island, Antarctic. Sixty-seven seismic site-response measurements near and far from the Argentinean Marambio Base runway suggest geotechnical works on the uppermost sedimentary layers due to maintenance, landing, and taxi of large loads and aircraft during decades could contribute to changes in their seismic dynamic response. Two horizontal images of Vp, Vs, and Vp/ Vs ratios at 1.0 m and 35.0 m depth show lateral variations in the permafrost properties. Authors interpret that permafrost is emplaced in rocks with different porosities and contrasting fluids saturation at those depths. In shallow strata, the saturation of gases affects mainly the elastic properties. In deeper strata, where the location of water reservoirs is detected, the primary mechanism of seismic dissipation is anelastic.
{"title":"Seismic properties of the permafrost layer using the HVSR method in Seymour-Marambio Island, Antarctica","authors":"Carlos Alberto Vargas Jimenez, Juan M. Solano, A. Gulisano, S. Santillana, E. A. Casallas","doi":"10.15446/esrj.v26n3.103981","DOIUrl":"https://doi.org/10.15446/esrj.v26n3.103981","url":null,"abstract":"Authors have calculated the H/V spectral ratios using seismic-noise recordings in the uppermost layers north of the Seymour-Marambio Island, Antarctic. Sixty-seven seismic site-response measurements near and far from the Argentinean Marambio Base runway suggest geotechnical works on the uppermost sedimentary layers due to maintenance, landing, and taxi of large loads and aircraft during decades could contribute to changes in their seismic dynamic response. Two horizontal images of Vp, Vs, and Vp/ Vs ratios at 1.0 m and 35.0 m depth show lateral variations in the permafrost properties. Authors interpret that permafrost is emplaced in rocks with different porosities and contrasting fluids saturation at those depths. In shallow strata, the saturation of gases affects mainly the elastic properties. In deeper strata, where the location of water reservoirs is detected, the primary mechanism of seismic dissipation is anelastic.","PeriodicalId":11456,"journal":{"name":"Earth Sciences Research Journal","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44554761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-29DOI: 10.15446/esrj.v26n3.71479
R. Kemkina, I. Kemkin
The paper presents new data on mineral composition and geochemical peculiarities of ores from the Albazinskoe gold-bearing deposit (Khabarovsk region, Far East of Russia). Excepting earlier known ore minerals represented by sulfides of iron, arsenic, lead, zinc, and copper, authors have established about two tens of ore minerals, new for this deposit. Among them are sulfides of antimony, bismuth and molybdenum, native bismuth, copper, nickel, silver, tellurides of bismuth, cobalt sulphoarsenite, nickel sulphoantimonite, silver sulphobismuthites, lead-antimony-bismuth sulphosalts, oxides of tin, titanium, tungsten and some others. The revealed specificity of the ores' material composition indicates this deposit belongs to the gold-rare metallic ore-formational type. The sets of geological and structural data show that gold-bearing deposits of this ore-formational type are spatially and genetically associated with the granitoid magmatism, which is exhibited within transform continental margin and related to the geodynamic mode of sliding of the continental and oceanic lithospheric plates.
{"title":"Mineral composition of Albazinskoe deposit ores as an indicator of its belonging to the gold-rare metallic ore-formational type","authors":"R. Kemkina, I. Kemkin","doi":"10.15446/esrj.v26n3.71479","DOIUrl":"https://doi.org/10.15446/esrj.v26n3.71479","url":null,"abstract":"The paper presents new data on mineral composition and geochemical peculiarities of ores from the Albazinskoe gold-bearing deposit (Khabarovsk region, Far East of Russia). Excepting earlier known ore minerals represented by sulfides of iron, arsenic, lead, zinc, and copper, authors have established about two tens of ore minerals, new for this deposit. Among them are sulfides of antimony, bismuth and molybdenum, native bismuth, copper, nickel, silver, tellurides of bismuth, cobalt sulphoarsenite, nickel sulphoantimonite, silver sulphobismuthites, lead-antimony-bismuth sulphosalts, oxides of tin, titanium, tungsten and some others. The revealed specificity of the ores' material composition indicates this deposit belongs to the gold-rare metallic ore-formational type. The sets of geological and structural data show that gold-bearing deposits of this ore-formational type are spatially and genetically associated with the granitoid magmatism, which is exhibited within transform continental margin and related to the geodynamic mode of sliding of the continental and oceanic lithospheric plates.","PeriodicalId":11456,"journal":{"name":"Earth Sciences Research Journal","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45508462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-08DOI: 10.15446/esrj.v26n2.98451
T. Oljira, O. Okunlola, A. Olatunji, D. Ayalew, B. Bedada
The Western Ethiopian Shield is underlain by volcano-sedimentary terranes, gneissic terranes, and ophiolitic rocks intruded by different granitoid bodies. The Megele area is part of Western Ethiopian Shield and consist of a low-grade volcano-sedimentary zone that has been intruded by mafic (dolerite dyke) and granitoid intrusions (granodiorite, diorite, granite gneiss). To establish the origin of the distinctive lithologies of the locality and evaluate its mineral potential, petrological, petrographical, and geochemical characterization of these rocks were carried out. Hence, the lithological, geochemical, and petrogenetic features of the Neoproterozoic granitoid intrusives and associated metavolcanic, were illustrated through a combination of field mapping, petrological, and geochemical analysis. The petrological result obtained from the thin section analysis of the granitoids and metabasalt from Megele area indicates that, these rocks has been metamorphosed from lower green-schist facies to lower amphibolite facies as denoted by mineral assemblages such as albite + muscovite + prehnite+ quartz and actinolite + hornblende + epidote + garnet. The major and trace element geochemical analysis of granodiorite, diorite, and granite gneiss revealed that the rocks in the studied area were mainly calc-alkaline and peraluminous in nature in the SiO2 versus Na2O+K2O and A/NK versus A/CNK, the details of the results on the major and rare elements are stated in the result section respectively. The granitoids are S-type granites revealed silica saturated rock formed at the volcanic arc subduction (VAG) to syn-collisional (syn-COLD) tectonic setting by fractionation of LREE-enriched, HREE-depleted basaltic magma with considerable crustal input. This basaltic magma seems to be generated from the LREE-enriched, HREE-depleted mantle. In conclusion, the metabasalt is sub-alkaline (tholeiitic), metaluminous bodies generated at mid-oceanic ridge tectonic setting by partially melting of HREE-depleted and LREE-enriched basaltic magma. The magma sources are associated with the reworked sediment-laden crustal slabs from the subduction zone and resulted in S-type granitoid.
{"title":"Petrogenesis of the Neoproterozoic rocks of Megele area, Asosa, Western Ethiopia","authors":"T. Oljira, O. Okunlola, A. Olatunji, D. Ayalew, B. Bedada","doi":"10.15446/esrj.v26n2.98451","DOIUrl":"https://doi.org/10.15446/esrj.v26n2.98451","url":null,"abstract":"The Western Ethiopian Shield is underlain by volcano-sedimentary terranes, gneissic terranes, and ophiolitic rocks intruded by different granitoid bodies. The Megele area is part of Western Ethiopian Shield and consist of a low-grade volcano-sedimentary zone that has been intruded by mafic (dolerite dyke) and granitoid intrusions (granodiorite, diorite, granite gneiss). To establish the origin of the distinctive lithologies of the locality and evaluate its mineral potential, petrological, petrographical, and geochemical characterization of these rocks were carried out. Hence, the lithological, geochemical, and petrogenetic features of the Neoproterozoic granitoid intrusives and associated metavolcanic, were illustrated through a combination of field mapping, petrological, and geochemical analysis. The petrological result obtained from the thin section analysis of the granitoids and metabasalt from Megele area indicates that, these rocks has been metamorphosed from lower green-schist facies to lower amphibolite facies as denoted by mineral assemblages such as albite + muscovite + prehnite+ quartz and actinolite + hornblende + epidote + garnet. The major and trace element geochemical analysis of granodiorite, diorite, and granite gneiss revealed that the rocks in the studied area were mainly calc-alkaline and peraluminous in nature in the SiO2 versus Na2O+K2O and A/NK versus A/CNK, the details of the results on the major and rare elements are stated in the result section respectively. The granitoids are S-type granites revealed silica saturated rock formed at the volcanic arc subduction (VAG) to syn-collisional (syn-COLD) tectonic setting by fractionation of LREE-enriched, HREE-depleted basaltic magma with considerable crustal input. This basaltic magma seems to be generated from the LREE-enriched, HREE-depleted mantle. In conclusion, the metabasalt is sub-alkaline (tholeiitic), metaluminous bodies generated at mid-oceanic ridge tectonic setting by partially melting of HREE-depleted and LREE-enriched basaltic magma. The magma sources are associated with the reworked sediment-laden crustal slabs from the subduction zone and resulted in S-type granitoid.","PeriodicalId":11456,"journal":{"name":"Earth Sciences Research Journal","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45317544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-08DOI: 10.15446/esrj.v26n2.100645
Valéria Cristina Silva, D. Blitzkow, F. G. V. Almeida, A. Matos, G. Guimarães
In recent decades, important steps have been taken to implement the physical concepts of Geodesy in practice, con- cerning height systems. Despite the difficulties involving gravity field modeling, with the establishment of conventions, standards, and computation strategies, the realization of the International Height Reference System (IHRS) is well underway. For a global system, there are constraints for some countries, especially for those with sparse gravity data, mountain regions, and vast areas. In terms of methodology, the computation can be performed directly using the Global Geopotential Models (GGM), recovering existing geoid models, or determining pointwise the gravity potential using integral formulas. In general, the regional gravity modeling is given by numerical integration or least-squares collocation and more recently adopting the spherical radial basis functions. The first approach allows determining the earth’s gravity component at a specific point and adjusting the integral formula according to the gravity coverage. Since so far there is no common sense about the best methodology, computation strategies are been analyzed. In this con- text, the paper aims to contribute to IHRF, computing the geopotential number in the scope of IHRF, using numerical integration to solve the Geodetic Boundary Value Problem and an existing recent quasi-geoid model in four stations in São Paulo state, Brazil. The first approach was performed considering two cases: a radius of 210 km and 110 km of gravimetric data coverage and the Global Geopotential Model GOCO05S truncated at 100 and 200, respectively. The results between solutions have shown a maximum difference of 94 cm, and a minimum difference of 10 cm.
{"title":"Computation and Analysis of Geopotential Number in São Paulo, Brazil","authors":"Valéria Cristina Silva, D. Blitzkow, F. G. V. Almeida, A. Matos, G. Guimarães","doi":"10.15446/esrj.v26n2.100645","DOIUrl":"https://doi.org/10.15446/esrj.v26n2.100645","url":null,"abstract":"\u0000\u0000\u0000\u0000In recent decades, important steps have been taken to implement the physical concepts of Geodesy in practice, con- cerning height systems. Despite the difficulties involving gravity field modeling, with the establishment of conventions, standards, and computation strategies, the realization of the International Height Reference System (IHRS) is well underway. For a global system, there are constraints for some countries, especially for those with sparse gravity data, mountain regions, and vast areas. In terms of methodology, the computation can be performed directly using the Global Geopotential Models (GGM), recovering existing geoid models, or determining pointwise the gravity potential using integral formulas. In general, the regional gravity modeling is given by numerical integration or least-squares collocation and more recently adopting the spherical radial basis functions. The first approach allows determining the earth’s gravity component at a specific point and adjusting the integral formula according to the gravity coverage. Since so far there is no common sense about the best methodology, computation strategies are been analyzed. In this con- text, the paper aims to contribute to IHRF, computing the geopotential number in the scope of IHRF, using numerical integration to solve the Geodetic Boundary Value Problem and an existing recent quasi-geoid model in four stations in São Paulo state, Brazil. The first approach was performed considering two cases: a radius of 210 km and 110 km of gravimetric data coverage and the Global Geopotential Model GOCO05S truncated at 100 and 200, respectively. The results between solutions have shown a maximum difference of 94 cm, and a minimum difference of 10 cm.\u0000\u0000\u0000\u0000","PeriodicalId":11456,"journal":{"name":"Earth Sciences Research Journal","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46308384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-08DOI: 10.15446/esrj.v26n2.92417
F. Dursun, K. Zorlu, M. Gül
This study aims to describe, classify, and analyze the most common anthropogenic factors that have altered the landscape. For this reason, the city of Diyarbakır, one of Mesopotamia’s largest and most urbanized cities, was chosen as an example of several anthropogenic factors. Several field surveys were conducted to determine the most common anthropogenic activities in the study area. They were then classified into four categories: marble quarries, aggregate quarries, water bodies, and built-up areas. A series of satellite images spanning 1975 to 2019 were analyzed by investigating time-based anthropogenic changes. The trends, distributions, and impacts of 177 locations were examined and monitored through remotely sensed images. Between 1975 and 2019, a total of 25224 ha of land were transformed, according to the findings. “Water bodies” were the most extended of the studied classes. The second most rapidly expanding class was “Built-up areas.” The “Built-up areas” class was assumed to be the most effective agent that will continue to modify the land of the study area, given the need for more construction spaces. Surface mining activities can also be assumed to be an efficient agent that will continue to modify the lands of Diyarbakır in the future, considering the export potential of marble products and the demand for construction material. Water resources and building materials supply should be examined in depth throughout future development planning of such urbanized cities to minimize anthropogenic degradation.
{"title":"Using satellite imagery to assess the changes in land use and land cover in Diyarbakır city (SE Turkey)","authors":"F. Dursun, K. Zorlu, M. Gül","doi":"10.15446/esrj.v26n2.92417","DOIUrl":"https://doi.org/10.15446/esrj.v26n2.92417","url":null,"abstract":"\u0000\u0000\u0000\u0000This study aims to describe, classify, and analyze the most common anthropogenic factors that have altered the landscape. For this reason, the city of Diyarbakır, one of Mesopotamia’s largest and most urbanized cities, was chosen as an example of several anthropogenic factors. Several field surveys were conducted to determine the most common anthropogenic activities in the study area. They were then classified into four categories: marble quarries, aggregate quarries, water bodies, and built-up areas. A series of satellite images spanning 1975 to 2019 were analyzed by investigating time-based anthropogenic changes. The trends, distributions, and impacts of 177 locations were examined and monitored through remotely sensed images. Between 1975 and 2019, a total of 25224 ha of land were transformed, according to the findings. “Water bodies” were the most extended of the studied classes. The second most rapidly expanding class was “Built-up areas.” The “Built-up areas” class was assumed to be the most effective agent that will continue to modify the land of the study area, given the need for more construction spaces. Surface mining activities can also be assumed to be an efficient agent that will continue to modify the lands of Diyarbakır in the future, considering the export potential of marble products and the demand for construction material. Water resources and building materials supply should be examined in depth throughout future development planning of such urbanized cities to minimize anthropogenic degradation.\u0000\u0000\u0000\u0000","PeriodicalId":11456,"journal":{"name":"Earth Sciences Research Journal","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46381550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-08DOI: 10.15446/esrj.v26n2.89819
Ömer Gökdaş, M. Özlüdemir
The geometric design of the Continuously Operating Reference Station (CORS) network is one of the most critical factors that impact accuracy, precision, and Time to Fix Ambiguity (TTFA) performance. In this study, the authors investigate the subject of geometric design by using both local ISKI CORS and national CORS-Turkey (CORS-TR) networks, and they redesign the ISKI CORS network by increasing interstation distances. For three systems, real-time Virtual Reference Station (VRS) solutions have been obtained and tested with Analysis of Variance (ANOVA). As a result, the 8-station ISKI CORS provides the most accurate results in the vertical component. In contrast, for TTFA performance, the CORS-TR network shows worse outcomes than the others. Due to the increase in the interstation distances, the increase in the base length caused worse results in FIX solution ratios for redesigned ISKI CORS. In summary, the authors have stated that the 8-station ISKI CORS network performs better, especially regarding vertical accuracy. Furthermore, the authors state that the TTFA performance and FIX solution ratios are high, and the ISKI CORS geometric design is optimal.
{"title":"Effects of the Continuously Operating Reference Station (CORS) network on the accuracy, precision, and Time to Fix Ambiguity (TTFA) performance","authors":"Ömer Gökdaş, M. Özlüdemir","doi":"10.15446/esrj.v26n2.89819","DOIUrl":"https://doi.org/10.15446/esrj.v26n2.89819","url":null,"abstract":"The geometric design of the Continuously Operating Reference Station (CORS) network is one of the most critical factors that impact accuracy, precision, and Time to Fix Ambiguity (TTFA) performance. In this study, the authors investigate the subject of geometric design by using both local ISKI CORS and national CORS-Turkey (CORS-TR) networks, and they redesign the ISKI CORS network by increasing interstation distances. For three systems, real-time Virtual Reference Station (VRS) solutions have been obtained and tested with Analysis of Variance (ANOVA). As a result, the 8-station ISKI CORS provides the most accurate results in the vertical component. In contrast, for TTFA performance, the CORS-TR network shows worse outcomes than the others. Due to the increase in the interstation distances, the increase in the base length caused worse results in FIX solution ratios for redesigned ISKI CORS. In summary, the authors have stated that the 8-station ISKI CORS network performs better, especially regarding vertical accuracy. Furthermore, the authors state that the TTFA performance and FIX solution ratios are high, and the ISKI CORS geometric design is optimal.","PeriodicalId":11456,"journal":{"name":"Earth Sciences Research Journal","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43135896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-08DOI: 10.15446/esrj.v26n2.94786
E. Topçu
Drought is a natural phenomenon that occurs frequently and has some adverse effects on the ecosystem and humanity. Determination of drought beforehand is vital for optimal management of water resources. Many different methods have been developed to detect drought. Sequential association analysis is used for the data series analysis containing time information and is one of the methods used to determine the drought. A correlation can be established between the values taken by the data at different times when determining association rules with this method. The primary purpose of this study is to determine the sequential association patterns between precipitation and climate oscillation index for Aras Basin. The Aras basin is a region where irrigation and animal husbandry are common. Today, many dams and hydroelectric power plants, together with the increasing population, meet the water and energy needs. A possible drought event in this region will adversely affect the living things in the basin. Therefore, the study focused on this basin. Finding sequential associations between precipitation and climate oscillation index can determine the temporal correlations between these parameters and specifically detect drought. The MOWCATL (Minimal Occurrences with Constraints and Time Lags) algorithm was used to detect sequential associations, and the J-measure was used to evaluate the patterns in the study. Sequential association patterns were determined by applying this method to the precipitation data obtained from 6 meteorology stations in the Aras basin. AO (Arctic Oscillation) Index, MEI (Multivariate ENSO) Index, NAO (North Atlantic Oscillation) Index, Oceanic Niño Index (ONI), PDO (Pacific Decadal Oscillation) Index, PNA (Pacific/North American), and SOI (Southern Oscillation Index), followed by the 1, 3, 6 and 12-month Agricultural Standardized Precipitation Index (a-SPI) were used in sequential association. The study results revealed that the antecedent parameters were ineffective in detecting arid conditions in Ardahan and Doğubeyazıt stations, and they were influential on drought conditions, especially in a-SPI-3 and a-SPI-12 month periods at other stations. Although the altitude and geographical features are different, similar climatic patterns have been detected in some stations. As a result, it has been determined that climatic oscillations generally bring about typical situations in terms of drought for the Aras Basin.
干旱是一种频繁发生的自然现象，对生态系统和人类都有一定的不利影响。提前确定干旱对水资源的优化管理至关重要。人们开发了许多不同的方法来探测干旱。序列关联分析是一种包含时间信息的数据序列分析方法，是确定干旱的方法之一。在使用该方法确定关联规则时，可以在不同时间的数据值之间建立相关性。本研究的主要目的是确定阿拉斯盆地降水与气候振荡指数的序列关联模式。阿拉斯盆地是一个以灌溉和畜牧业为主的地区。今天，许多水坝和水力发电厂，加上不断增长的人口，满足了水和能源的需求。这个地区可能发生的干旱事件将对盆地里的生物产生不利影响。因此，研究重点是该盆地。发现降水与气候振荡指数之间的序列关系，可以确定这些参数之间的时间相关性，并可以具体地检测干旱。MOWCATL (minimum Occurrences with Constraints and Time lag)算法用于检测序列关联，J-measure用于评估研究中的模式。将该方法应用于阿拉斯区6个气象站的降水资料，确定了序列关联模式。利用AO (Arctic Oscillation)指数、MEI (Multivariate ENSO)指数、NAO (North Atlantic Oscillation)指数、Oceanic Niño指数(ONI)、PDO (Pacific Decadal Oscillation)指数、PNA (Pacific/North American)指数和SOI (Southern Oscillation)指数，以及1、3、6和12个月农业标准化降水指数(a-SPI)进行序列关联。研究结果表明，在Ardahan和Doğubeyazıt站点，先验参数对干旱条件的检测效果不明显，但对其他站点的干旱条件有影响，特别是在a-SPI-3和a-SPI-12个月期间。虽然海拔和地理特征不同，但在一些气象站发现了类似的气候模式。因此，已经确定，气候振荡通常会给阿拉斯盆地带来典型的干旱情况。
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Pub Date : 2022-09-08DOI: 10.15446/esrj.v26n2.95993
Néstor Cano, J. Molano, Janeth Sepúlveda
La Quinta Formation is a Triassic-Jurassic volcano-sedimentary unit that crops out along both flanks of the Serranía de Perijá, in Cesar and La Guajira departments of Colombia, and Zulia state in Venezuela. It is mainly composed of red clastic sedimentary rocks (siltstones, sandstones, and minor conglomerates), interbedded with volcanic rocks and cut by small stocks. The volcanic horizons are mainly formed by rhyolitic tuffs and lava flows (basalts and andesites). Andesites and basalts are constituted by plagioclase, clinopyroxene, biotite, magnetite, apatite, and zircon, whereas rhyolites and tuffs are formed by plagioclase, ß quartz, biotite, and sanidine. EMPA analyses revealed that plagioclase display varying compositions from labradorite-andesine in intermediate and basic rocks to oligoclase in rhyolites. Besides, clinopyroxene from basalts was classified as augite, and several hydrothermal mineral phases were also recognized, such as epidote, Ca-zeolites, and andradite-grossular. Using ILMAT (ilmenite-magnetite) geothermometer, temperature and oxygen fugacity conditions of 700-730°C and +1.2 ∆NNO were determined for dolerite. Whole-rock geochemistry results evidence that La Quinta Formation volcanic rocks belong to the sub-alkaline (calc-alkaline) series, displaying compositions from basaltic andesites to rhyolites. Chondrite normalized REE and incompatible elements spidergrams show typical features of subduction-related magmatism and depict three groups of rocks (basic, intermediate, and acid) with contrasting geochemical behaviors. Hence, each group could have formed during single magmatic events associated with different magmatic suites. Nevertheless, the three groups have features that suggest a genesis related to an Andean-type supra-subduction zone, which agrees with the regional tectonic assemblage during Triassic-Jurassic times.
拉昆塔组是一个三叠纪-侏罗纪火山-沉积单元，沿Serranía de perij两侧，位于哥伦比亚的塞萨尔和拉瓜希拉省以及委内瑞拉的苏利亚州。主要由红色碎屑沉积岩(粉砂岩、砂岩和小型砾岩)组成，与火山岩互层，并被少量岩石切割。火山层主要由流纹凝灰岩和熔岩流(玄武岩和安山岩)构成。安山岩和玄武岩主要由斜长石、斜辉石、黑云母、磁铁矿、磷灰石和锆石组成，流纹岩和凝灰岩主要由斜长石、石英、黑云母和硅云母组成。EMPA分析表明，中基性岩中的斜长石和流纹岩中的斜长石组成不同，从拉布拉长岩-安长岩到流纹岩中的低长岩。将玄武岩中的斜辉石划分为辉长岩，并识别出绿帘石、钙沸石、角闪石等热液矿物相。采用ILMAT(钛铁矿-磁铁矿)地温计测定了白云石700 ~ 730℃和+1.2∆NNO的温度和氧逸度条件。全岩地球化学结果表明，拉昆塔组火山岩属于亚碱性(钙碱性)系列，其组成由玄武岩安山岩到流纹岩。球粒陨石归一化稀土元素和不相容元素蜘蛛图显示了与俯冲有关的岩浆活动的典型特征，描绘了三组岩石(基性、中间和酸性)的地球化学行为。因此，每一组都可能形成于与不同岩浆套相关联的单一岩浆事件中。然而，这三个群具有与安第斯型超俯冲带有关的成因特征，这与三叠纪-侏罗纪时期的区域构造组合相一致。
{"title":"Petrogenetic constraints of the La Quinta Formation igneous rocks, Serranía del Perijá, northern Colombian Andes","authors":"Néstor Cano, J. Molano, Janeth Sepúlveda","doi":"10.15446/esrj.v26n2.95993","DOIUrl":"https://doi.org/10.15446/esrj.v26n2.95993","url":null,"abstract":"La Quinta Formation is a Triassic-Jurassic volcano-sedimentary unit that crops out along both flanks of the Serranía de Perijá, in Cesar and La Guajira departments of Colombia, and Zulia state in Venezuela. It is mainly composed of red clastic sedimentary rocks (siltstones, sandstones, and minor conglomerates), interbedded with volcanic rocks and cut by small stocks. The volcanic horizons are mainly formed by rhyolitic tuffs and lava flows (basalts and andesites). \u0000 \u0000Andesites and basalts are constituted by plagioclase, clinopyroxene, biotite, magnetite, apatite, and zircon, whereas rhyolites and tuffs are formed by plagioclase, ß quartz, biotite, and sanidine. EMPA analyses revealed that plagioclase display varying compositions from labradorite-andesine in intermediate and basic rocks to oligoclase in rhyolites. Besides, clinopyroxene from basalts was classified as augite, and several hydrothermal mineral phases were also recognized, such as epidote, Ca-zeolites, and andradite-grossular. Using ILMAT (ilmenite-magnetite) geothermometer, temperature and oxygen fugacity conditions of 700-730°C and +1.2 ∆NNO were determined for dolerite. \u0000 \u0000Whole-rock geochemistry results evidence that La Quinta Formation volcanic rocks belong to the sub-alkaline (calc-alkaline) series, displaying compositions from basaltic andesites to rhyolites. Chondrite normalized REE and incompatible elements spidergrams show typical features of subduction-related magmatism and depict three groups of rocks (basic, intermediate, and acid) with contrasting geochemical behaviors. Hence, each group could have formed during single magmatic events associated with different magmatic suites. Nevertheless, the three groups have features that suggest a genesis related to an Andean-type supra-subduction zone, which agrees with the regional tectonic assemblage during Triassic-Jurassic times.","PeriodicalId":11456,"journal":{"name":"Earth Sciences Research Journal","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48214389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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