<abstract xmlns="http://www.w3.org/1999/xhtml">

For the present study, geochemical ages were derived from radiocarbon and radiokrypton age calibration with ground-water chemical contents (Na+, K+, Mg2+, Ca2+, Cl−, SO42−, HCO3−). Geochemical ages may fill the dating gap (40–150 ka) between the isotope techniques mentioned. A case study of groundwater in the Baltic Artesian Basin has involved geochemical age calibration, data filtering (such as regional subdivision of the basin for more accurate results) and geochemical dating of groundwater of unknown age. Various approaches to interpretations of geochemical age results could be used. Bicarbonate and sulphate are sensitive to the hydrochemical environment and should be omitted from geochemical age calculations. Modern fresh groundwater samples should also be excluded from calibration in order to obtain more reliable trend lines. Calcium-sodium cation exchange occurs in deep aquifers and may be used for geo-chemical age determination of fossil groundwater.
</abstract>

Calibrated geochemical ages of the Baltic Artesian Basin groundwater

<abstract xmlns="http://www.w3.org/1999/xhtml">

Seen in the light of increasing anthropogenic impacts on the environment and a growing demand for potable water, pollution of groundwater is a very important issue, especially in large city areas. The present research includes analyses of the chemical composition at 109 measuring points in the Wrocław area, and of the spatial distribution of groundwater components with regard to land use, geological structure and hydrogeological conditions. Based on spatial analyses, it has been noted that changes depend mainly on land use and the kind of activity carried out in close proximity of water intake. Shallow groundwater in Wrocław is characterised by a great variability of main components. Factor analysis has made it possible to distinguish these components and determine the degree of their influence on the chemical composition of shallow groundwater in the entire study area. The current research demonstrates the high sensitivity of aquifers to pollution and emphasises the role of human activity in levels of groundwater pollution in urban areas.
</abstract>

Influence of natural and anthropogenic factors on the chemical composition of shallow groundwater in the city of Wrocław, south-west Poland

<abstract xmlns="http://www.w3.org/1999/xhtml">

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.
</abstract>

Department of Chemistry, College of Natural and Mathematical Sciences

Department of Geology, College of Earth Sciences and Engineering

Radiometric dating of the Ootun palaeosol and its implication for the age of the Shifting Sand in Ngorongoro Lengai Geopark (Arusha, Tanzania)

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

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

Authors of articles published in Geologos in 2022 – brief information

Thanks to the journal’s reviewers

AHEAD OF PRINT

Volume 29 (2023): Issue 3 (December 2023)

Volume 29 (2023): Issue 2 (August 2023)

Volume 29 (2023): Issue 1 (April 2023)

Volume 28 (2022): Issue 3 (December 2022)

Volume 28 (2022): Issue 2 (August 2022)

Volume 28 (2022): Issue 1 (April 2022)

Volume 27 (2021): Issue 3 (December 2021)

Volume 27 (2021): Issue 2 (August 2021)

Volume 27 (2021): Issue 1 (April 2021)

Volume 26 (2020): Issue 3 (December 2020)

Volume 26 (2020): Issue 2 (August 2020)

Volume 26 (2020): Issue 1 (April 2020)

Volume 25 (2019): Issue 3 (December 2019)

Volume 25 (2019): Issue 2 (August 2019)

Volume 25 (2019): Issue 1 (April 2019)

Volume 24 (2018): Issue 3 (December 2018)

Volume 24 (2018): Issue 2 (August 2018)

Volume 24 (2018): Issue 1 (March 2018)

Volume 23 (2017): Issue 3 (December 2017)

Volume 23 (2017): Issue 2 (June 2017)

Volume 23 (2017): Issue 1 (March 2017)

Volume 22 (2016): Issue 3 (September 2016)

Volume 22 (2016): Issue 2 (June 2016)

Volume 22 (2016): Issue 1 (March 2016)

Volume 21 (2015): Issue 4 (December 2015)

Volume 21 (2015): Issue 3 (September 2015)

Volume 21 (2015): Issue 2 (June 2015)

Volume 21 (2015): Issue 1 (March 2015)

Volume 20 (2014): Issue 4 (December 2014)

Volume 20 (2014): Issue 3 (September 2014)

Volume 20 (2014): Issue 2 (June 2014)

Volume 20 (2014): Issue 1 (March 2014)

Volume 19 (2013): Issue 4 (December 2013)

Volume 19 (2013): Issue 3 (September 2013)

Volume 19 (2013): Issue 1-2 (May 2013) Heavy-mineral analysis as a tool in earth-scientific research

Volume 18 (2012): Issue 4 (December 2012)

Volume 18 (2012): Issue 3 (October 2012)

Volume 18 (2012): Issue 2 (August 2012)

Volume 18 (2012): Issue 1 (March 2012)

Volume 17 (2011): Issue 4 (December 2011)

Volume 17 (2011): Issue 3 (September 2011)

Volume 17 (2011): Issue 2 (June 2011)

Volume 17 (2011): Issue 1 (April 2011)

Volume 16 (2010): Issue 4 (December 2010)

Volume 16 (2010): Issue 3 (October 2010)

Volume 16 (2010): Issue 2 (June 2010)

Volume 16 (2010): Issue 1 (April 2010)

Volume 15 (2009): Issue 3-4 (December 2009)

Geologos

GEOLOGOS is an international, peer-reviewed journal publishing research results and review articles covering all earth-science disciplines, with a focus on the geology of central and eastern Europe. Studies on areas of poorly known geology (e.g. Asia and Africa) are also published. Articles from non-European areas should be universal and problem-related, while purely regional issues are avoided.  Over the last years, Geologos has published studies on many topics, including:    mineralogy and geochemistry  sedimentology (siliciclastics and carbonates, sedimentary structures, facies analysis)  palaeontology (invertebrate palaeontology, trace fossils, micropalaeontology)  stratigraphy and petroleum geology (sequence stratigraphy)  glacial geology (Pleistocene palaeogeography and stratigraphy, lithology of glaciogenic deposits)  hydrogeology (groundwater circulation, groundwater flow models, drainage systems, deep aquifers)  meteorites (Morasko meteorite fall).    GEOLOGOS has been issued since 1995 as the journal of the Institute of Geology, Adam Mickiewicz University (AMU) in Poznań, Poland.  GEOLOGOS is an open access journal; all content is freely available without charge.  Three issues of GEOLOGOS are published each year. Electronic versions of all papers are published on the Sciendo platform.  Why subscribe and read    Journal on geology of Central and Eastern Europe as well as other areas of poorly known geology   Why submit    Quick publication, colour pages free of chargé. To publish in GEOLOGOS, authors are not required to pay an Article Processing Charge.   Reviewing    Each manuscript, as a rule, is reviewed by two referees, commonly one Polish and one foreign. Reviews are double-blind.   Rejection Rate    About 40%    Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 