Geologos最新文献_第3页

Calibrated geochemical ages of the Baltic Artesian Basin groundwater 波罗的海自流盆地地下水的校准地球化学年龄

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Geologos Pub Date : 2022-12-01 DOI: 10.14746/logos.2022.28.3.0001

V. Samalavičius, Jurga Arustienė

引用次数: 0

Book reviews: Granite landscapes of the world, by Piotr Migoń, 2006. Oxford University Press, Oxford, UK, 384 pages. Hardback: price 383$, ISBN 0-19-927368-5; 978-0-19-927368-3 书评:《世界的花岗岩景观》，彼得·米戈维著，2006年。牛津大学出版社，牛津，英国，384页。精装本:价格383美元，ISBN 0-19-927368-5;978-0-19-927368-3

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Geologos Pub Date : 2022-12-01 DOI: 10.14746/logos.2022.28.3.0004

J. Burda

引用次数: 0

Radiometric dating of the Ootun palaeosol and its implication for the age of the Shifting Sand in Ngorongoro Lengai Geopark (Arusha, Tanzania) Ngorongoro Lengai地质公园（坦桑尼亚阿鲁沙）Ootun古土壤的放射性测年及其对流沙年龄的影响

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Geologos Pub Date : 2022-12-01 DOI: 10.14746/logos.2022.28.3.0003

Mohamed Zengo Makongoro, Maheswara Rao Vegi, S. Vuai, M. Msabi

{"title":"Radiometric dating of the Ootun palaeosol and its implication for the age of the Shifting Sand in Ngorongoro Lengai Geopark (Arusha, Tanzania)","authors":"Mohamed Zengo Makongoro, Maheswara Rao Vegi, S. Vuai, M. Msabi","doi":"10.14746/logos.2022.28.3.0003","DOIUrl":"https://doi.org/10.14746/logos.2022.28.3.0003","url":null,"abstract":"Abstract The Shifting Sand is a barchan dune in Ngorongoro Lengai Geopark in Arusha, Tanzania. The geopark, a UNESCO World Heritage Site, is protected by the Ngorongoro Conservation Area Authority. The dune ranks amongst the main geosites that have been attracting numerous tourists; it formed as a result of volcanic ash eruptions that led to tephra deposition on a palaeosol (palaeosurface) in the Ootun area. The easterly winds modified the ash into dunes and headed to the Olduvai Gorge area. The age of the Shifting Sand dune is not known in detail. In the present study, we employ the radiocarbon (14C) dating method to date a subsurface palaeosol bed in the Ootun area where the tephra (i.e., original Shifting Sand materials) was originally deposited. An Accelerator Mass Spectrometer was used to determine the carbon-14 date of the palaeosol so as to estimate the age of the Shifting Sand dune, and an Energy Dispersive X-ray Fluorescent Spectrometer to determine the chemical composition of the Shifting Sand material and the tephra bed for correlative purposes. A radiocarbon (14C) date of 2510 ± 30 years BP for the Ootun palaeosol was obtained to estimate the minimum age of the Ootun subsurface tephra deposited in the area; since then, this started to move westwards towards the Olduvai Gorge area, where it is today defined as the Shifting Sand. The current findings add educational value to the Shifting Sand in Ngorongoro Lengai Geopark and improve our understanding of the eruption history of the Gregory Rift volcanoes.","PeriodicalId":44833,"journal":{"name":"Geologos","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48124969","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

Tsunami: the world’s greatest waves, by James Goff and Walter Dudley, 2021. Oxford University Press, USA, 231 pages. Hardback: price 17.24$, ISBN 0197546129 《海啸:世界上最大的海浪》，詹姆斯·戈夫和沃尔特·达德利，2021年。牛津大学出版社，美国，231页。精装本:17.24美元，ISBN 0197546129

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Geologos Pub Date : 2022-12-01 DOI: 10.14746/logos.2022.28.3.0005

Krzysztof Pleskot

引用次数: 0

Influence of natural and anthropogenic factors on the chemical composition of shallow groundwater in the city of Wrocław, south-west Poland 自然和人为因素对波兰西南部弗罗茨瓦夫市浅层地下水化学成分的影响

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Geologos Pub Date : 2022-12-01 DOI: 10.14746/logos.2022.28.3.0002

Marta Trałka, M. Błachowicz, Sebastian Buczyński

引用次数: 1

Frequency magnitude distribution and spatial correlation dimension of earthquakes in north-east Himalaya and adjacent regions 喜马拉雅东北部及邻近地区地震的频率-震级分布和空间相关维数

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Geologos Pub Date : 2022-08-01 DOI: 10.2478/logos-2022-0009

Rambooshan Tiwari, H. Paudyal

{"title":"Frequency magnitude distribution and spatial correlation dimension of earthquakes in north-east Himalaya and adjacent regions","authors":"Rambooshan Tiwari, H. Paudyal","doi":"10.2478/logos-2022-0009","DOIUrl":"https://doi.org/10.2478/logos-2022-0009","url":null,"abstract":"Abstract The north-east sector of the Himalaya is one of the most active tectonic belts, with complex geological and tectonic features. The b-value and spatial correlation dimension (Dc) of earthquake distribution in the north-east Himalaya and its adjacent regions (20–32°N and 88–98°E) are estimated in the present study. Based on seismicity and faulting pattern, the region is divided into five active regions, namely the (i) South-Tibet, (ii) Eastern-Syntaxis, (iii) Himalayan-Frontal Arc, (iv) Arakan-Yoma belt and (v) Shillong-Plateau. A homogeneous catalogue of 1,416 earthquakes (mb ≥ 4.5) has been prepared from a revised catalogue of the ISC (International Seismological Centre). The b-value has been appraised by the maximum likelihood estimation method, while Dc values have been calculated by the correlation integral method; b-values of 1.08 ± 0.09, 1.13 ± 0.05, 0.92 ± 0.05, 1.00 ± 0.03 and 0.98 ± 0.08 have been computed for the South-Tibet, Eastern-Syntaxis, Himalayan-Frontal Arc, Arakan-Yoma belt and Shillong-Plateau region, respectively. The Dc values computed for the respective regions are 1.36 ± 0.02, 1.74 ± 0.04, 1.57 ± 0.01, 1.8 ± 0.01, and 1.83 ± 0.02. These values are > 1.5, except for the South-Tibet (1.36 ± 0.02). The b-values around the global average value (1.0) reflect the stress level and seismic activity of the regions, while high Dc values refer to the heterogeneity of the seismogenic sources.","PeriodicalId":44833,"journal":{"name":"Geologos","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49461965","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

Book reviews: Introduction to environmental modelling 书评:环境建模导论

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Geologos Pub Date : 2022-08-01 DOI: 10.2478/logos-2022-0014

M. Bronikowska

引用次数: 0

Iron-bearing phases affecting the colour of upper Neogene clayey sediments from Dymaczewo Stare, west-central Poland 影响波兰中西部Dymaczewo Stare上第三纪粘质沉积物颜色的含铁相

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Geologos Pub Date : 2022-08-01 DOI: 10.2478/logos-2022-0010

Jakub Klęsk, A. Błachowski, R. Diduszko, Ł. Kruszewski, M. Widera

{"title":"Iron-bearing phases affecting the colour of upper Neogene clayey sediments from Dymaczewo Stare, west-central Poland","authors":"Jakub Klęsk, A. Błachowski, R. Diduszko, Ł. Kruszewski, M. Widera","doi":"10.2478/logos-2022-0010","DOIUrl":"https://doi.org/10.2478/logos-2022-0010","url":null,"abstract":"Abstract The present paper investigates the colour dependence of mineral compositions in clay-rich sedimentary strata, mainly clayey silts, the emphasis being on iron-bearing minerals (rather than clay minerals) by using powder X-ray diffraction (PXRD) and 57Fe Mössbauer spectroscopy (57Fe-MS). The PXRD-based phase analysis has demonstrated the variable compositions of samples, consisting of, inter alia, quartz, calcite or gypsum, and admixtures of potassium feldspars and plagioclase. Hematite + goethite (sample D1, dark red), goethite (sample D2, pinkish brown), poorly crystalline goethite (sample D3, orange) and jarosite (sample D4, yellow) have been distinguished. A very low jarosite content was detected in sample D5 (light grey); this did not affect its colour. The potential yellow/brown shades in sample D6 (dark grey), coming from trace amounts of jarosite, are masked by macroscopically visible organic matter. In the case of the two last-named samples (D5 and D6), with trace amounts of Fe-bearing minerals, it is most likely that the organic matter was effective in influencing the light and dark grey colour of the sediment, respectively.","PeriodicalId":44833,"journal":{"name":"Geologos","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49659652","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

Book reviews: Volcanoes: a very short introduction 书评:火山:一个非常简短的介绍

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Geologos Pub Date : 2022-08-01 DOI: 10.2478/logos-2022-0015

C. Scarpati

引用次数: 0

Reconsidering the glaciogenic origin of Gondwana diamictites of the Dwyka Group, South Africa 南非Dwyka群冈瓦纳双晶岩冰川成因的再思考

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Geologos Pub Date : 2022-08-01 DOI: 10.2478/logos-2022-0008

Mats O. Molén, J. Smit

{"title":"Reconsidering the glaciogenic origin of Gondwana diamictites of the Dwyka Group, South Africa","authors":"Mats O. Molén, J. Smit","doi":"10.2478/logos-2022-0008","DOIUrl":"https://doi.org/10.2478/logos-2022-0008","url":null,"abstract":"Abstract The Gondwana Late Palaeozoic Ice Age is probably best represented by the Dwyka Group in South Africa. Striated and grooved surfaces or pavements are commonly considered to have formed subglacially, as are diamictites which have been interpreted as in-situ or reworked tillites. These interpretations were tested by investigation of outcrops in formerly well-studied areas, throughout South Africa. Detailed analyses have focused on striated surfaces/pavements and surface microtextures on quartz sand grains in diamictites. The sedimentological context of four pavements, interpreted to be glaciogenic, display features commonly associated with sediment gravity flows, rather than glaciation. A total of 4,271 quartz sand grains were subsampled from outcrops that are considered mainly to be tillites formed by continental glaciation. These grains, analysed by SEM, do not demonstrate the characteristic surface microtexture combinations of fracturing and irregular abrasion associated with Quaternary glacial deposits, but mainly a mix of surface microtextures associated with multicyclical grains. The Dwyka Group diamictites warrant reinterpretation as non-glacial sediment gravity flow deposits.","PeriodicalId":44833,"journal":{"name":"Geologos","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42010343","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: 4