Estuarine Sediments from the Boreal Region – an Indication of Weathering
Öre estuary (Northern Sweden) was chosen as a model for other anthropogenically unpolluted estuaries in the boreal region. Sediments were studied in detail in order to characterize the weathering products of silicate rocks. Primary rocks are mostly composed of granite and gneiss. Chemical analysis o...
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fthrcak:oai:hrcak.srce.hr:103093 2023-05-15T17:45:13+02:00 Estuarine Sediments from the Boreal Region – an Indication of Weathering Frančišković-Bilinski, Stanislav; Department of Physical Chemistry, Ruđer Bošković Institute, P. O. Box 180, HR-10002 Zagreb, Croatia; francis@rudjer.irb.hr Bilinski, Halka; Department of Physical Chemistry, Ruđer Bošković Institute, P. O. Box 180, HR-10002 Zagreb, Croatia Tibljaš, Darko; Division of Mineralogy and Petrology, Department of Geology, Faculty of Science, University of Zagreb, Horvatovac bb, HR-10000 Zagreb, Croatia Hanžel, Darko; Jožef Stefan Institute, Jamova 39, SI-1001 Ljubljana, Slovenia 2003-06-30 pdf http://hrcak.srce.hr/103093 http://hrcak.srce.hr/file/151658 en eng Croatian Chemical Society http://hrcak.srce.hr/103093 http://hrcak.srce.hr/file/151658 Parts of the contents of Croat. Chem. Acta (e. g. figures or tables) may be reproduced without prior permission, provided reference is made to their source. Croatica Chemica Acta (cca@chem.pmf.hr); Vol.76 No.2; ISSN 0011-1643 (Print); ISSN 1334-417X (Online) silicate weathering estuarine sediments boreal region X-ray diffraction X-ray fluorescence Mössbauer spectroscopy text 2003 fthrcak 2013-06-05T23:37:03Z Öre estuary (Northern Sweden) was chosen as a model for other anthropogenically unpolluted estuaries in the boreal region. Sediments were studied in detail in order to characterize the weathering products of silicate rocks. Primary rocks are mostly composed of granite and gneiss. Chemical analysis of total sediments was performed by the XRF method. SiO2 predominated (71.1–59.2 %) in all samples, decreasing seaward. Al2O3 (11.58–12.89 %) and Fe2O3 (3.71–6.92 %) were the other main chemical components and they increased seaward. Fourteen elements within the fine silt and clay fraction (f < 32 µm) were analyzed by the ICP-AES method. The most abundant microelement was Ti, followed by Mn, Zn, Ba, Cr, Sr, V, while Cu, Co and Ni were the least abundant. Organic matter was characterized as total carbon, hydrogen and nitrogen. Mineralogical composition was studied by the XRD method. The minerals found were quartz, different minerals from the feldspar group (albite, microcline, plagioclase, sanidine), biotite, chlorite and hornblende. Some weathering products, such as montmorillonite-15Å and Al(OH)3, were detected in the fine silt and clay fraction (f < 32 µm). Amorphous iron hydroxide could not be detected by the XRD method. Most of the trace elements determined by ICP-AES (Co, Mg, Cr, Ni, Cu, Mn, Zn) were in very good correlation with iron. 57Fe Mössbauer spectroscopy was used for further characterization. Measured at room temperature, Mössbauer spectra did not display magnetic ordering. In only one sample, closest to the river mouth, a better fit was obtained by adding one sextet pattern, but it was of minor significance. Relative amounts of Fe(II) and of Fe(III) were determined in each sample and the Fe(III)/Fe(II) ratio was calculated. It was observed that the amount of Fe(III) increased with the distance from the river mouth and it was either retained at the silicate sites or precipitated as amorphous iron oxide. Mössbauer spectroscopy indicates that the sediments sampled are mostly formed from metamorphic rocks due to the presence of altered biotite and chlorite. The results of this work demonstrate that sediments can be used to study weathering. Some of the reactions, according to the literature, are connected with the consumption of CO2. Examples of such reactions include the weathering of K-feldspar, albite and hornblende. Text Northern Sweden Hrčak - Portal of scientific journals of Croatia |
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English |
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silicate weathering estuarine sediments boreal region X-ray diffraction X-ray fluorescence Mössbauer spectroscopy |
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silicate weathering estuarine sediments boreal region X-ray diffraction X-ray fluorescence Mössbauer spectroscopy Frančišković-Bilinski, Stanislav; Department of Physical Chemistry, Ruđer Bošković Institute, P. O. Box 180, HR-10002 Zagreb, Croatia; francis@rudjer.irb.hr Bilinski, Halka; Department of Physical Chemistry, Ruđer Bošković Institute, P. O. Box 180, HR-10002 Zagreb, Croatia Tibljaš, Darko; Division of Mineralogy and Petrology, Department of Geology, Faculty of Science, University of Zagreb, Horvatovac bb, HR-10000 Zagreb, Croatia Hanžel, Darko; Jožef Stefan Institute, Jamova 39, SI-1001 Ljubljana, Slovenia Estuarine Sediments from the Boreal Region – an Indication of Weathering |
topic_facet |
silicate weathering estuarine sediments boreal region X-ray diffraction X-ray fluorescence Mössbauer spectroscopy |
description |
Öre estuary (Northern Sweden) was chosen as a model for other anthropogenically unpolluted estuaries in the boreal region. Sediments were studied in detail in order to characterize the weathering products of silicate rocks. Primary rocks are mostly composed of granite and gneiss. Chemical analysis of total sediments was performed by the XRF method. SiO2 predominated (71.1–59.2 %) in all samples, decreasing seaward. Al2O3 (11.58–12.89 %) and Fe2O3 (3.71–6.92 %) were the other main chemical components and they increased seaward. Fourteen elements within the fine silt and clay fraction (f < 32 µm) were analyzed by the ICP-AES method. The most abundant microelement was Ti, followed by Mn, Zn, Ba, Cr, Sr, V, while Cu, Co and Ni were the least abundant. Organic matter was characterized as total carbon, hydrogen and nitrogen. Mineralogical composition was studied by the XRD method. The minerals found were quartz, different minerals from the feldspar group (albite, microcline, plagioclase, sanidine), biotite, chlorite and hornblende. Some weathering products, such as montmorillonite-15Å and Al(OH)3, were detected in the fine silt and clay fraction (f < 32 µm). Amorphous iron hydroxide could not be detected by the XRD method. Most of the trace elements determined by ICP-AES (Co, Mg, Cr, Ni, Cu, Mn, Zn) were in very good correlation with iron. 57Fe Mössbauer spectroscopy was used for further characterization. Measured at room temperature, Mössbauer spectra did not display magnetic ordering. In only one sample, closest to the river mouth, a better fit was obtained by adding one sextet pattern, but it was of minor significance. Relative amounts of Fe(II) and of Fe(III) were determined in each sample and the Fe(III)/Fe(II) ratio was calculated. It was observed that the amount of Fe(III) increased with the distance from the river mouth and it was either retained at the silicate sites or precipitated as amorphous iron oxide. Mössbauer spectroscopy indicates that the sediments sampled are mostly formed from metamorphic rocks due to the presence of altered biotite and chlorite. The results of this work demonstrate that sediments can be used to study weathering. Some of the reactions, according to the literature, are connected with the consumption of CO2. Examples of such reactions include the weathering of K-feldspar, albite and hornblende. |
format |
Text |
author |
Frančišković-Bilinski, Stanislav; Department of Physical Chemistry, Ruđer Bošković Institute, P. O. Box 180, HR-10002 Zagreb, Croatia; francis@rudjer.irb.hr Bilinski, Halka; Department of Physical Chemistry, Ruđer Bošković Institute, P. O. Box 180, HR-10002 Zagreb, Croatia Tibljaš, Darko; Division of Mineralogy and Petrology, Department of Geology, Faculty of Science, University of Zagreb, Horvatovac bb, HR-10000 Zagreb, Croatia Hanžel, Darko; Jožef Stefan Institute, Jamova 39, SI-1001 Ljubljana, Slovenia |
author_facet |
Frančišković-Bilinski, Stanislav; Department of Physical Chemistry, Ruđer Bošković Institute, P. O. Box 180, HR-10002 Zagreb, Croatia; francis@rudjer.irb.hr Bilinski, Halka; Department of Physical Chemistry, Ruđer Bošković Institute, P. O. Box 180, HR-10002 Zagreb, Croatia Tibljaš, Darko; Division of Mineralogy and Petrology, Department of Geology, Faculty of Science, University of Zagreb, Horvatovac bb, HR-10000 Zagreb, Croatia Hanžel, Darko; Jožef Stefan Institute, Jamova 39, SI-1001 Ljubljana, Slovenia |
author_sort |
Frančišković-Bilinski, Stanislav; Department of Physical Chemistry, Ruđer Bošković Institute, P. O. Box 180, HR-10002 Zagreb, Croatia; francis@rudjer.irb.hr |
title |
Estuarine Sediments from the Boreal Region – an Indication of Weathering |
title_short |
Estuarine Sediments from the Boreal Region – an Indication of Weathering |
title_full |
Estuarine Sediments from the Boreal Region – an Indication of Weathering |
title_fullStr |
Estuarine Sediments from the Boreal Region – an Indication of Weathering |
title_full_unstemmed |
Estuarine Sediments from the Boreal Region – an Indication of Weathering |
title_sort |
estuarine sediments from the boreal region – an indication of weathering |
publisher |
Croatian Chemical Society |
publishDate |
2003 |
url |
http://hrcak.srce.hr/103093 http://hrcak.srce.hr/file/151658 |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_source |
Croatica Chemica Acta (cca@chem.pmf.hr); Vol.76 No.2; ISSN 0011-1643 (Print); ISSN 1334-417X (Online) |
op_relation |
http://hrcak.srce.hr/103093 http://hrcak.srce.hr/file/151658 |
op_rights |
Parts of the contents of Croat. Chem. Acta (e. g. figures or tables) may be reproduced without prior permission, provided reference is made to their source. |
_version_ |
1766148068993925120 |