| 81. |
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| 82. |
- Burman, Jan-Ola, et al.
(author)
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Comparison of different plasma excitation and calibration methods in the analysis of geological materials by optical emission spectrometry
- 1979
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In: Analytical Chemistry. - : American Chemical Society (ACS). - 0003-2700 .- 1520-6882. ; 51:4, s. 516-520
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Journal article (peer-reviewed)abstract
- A comparative study has been made of different dissolution and calibration methods for analyses by optical emission spectrometry (OES) utilizing inductively coupled plasma (ICP) and capacitively coupled microwave plasma (MWP) as excitation sources. The test substances were geological standard rocks, in which SlO2, Al2O3, TiO2, Fe2O3, MnO, MgO CaO, Na2O, Ba, and some traces were determined. The results show that analyses by MWP-OES are severely disturbed by matrix effects; only in the presence of large quantities of ionization buffers e.g., [Sr(NO3)2] can MWP-OES yield rock analyses of very good quality. No buffers are needed for analyses by ICP-OES, for which the matrix effects are remarkably low. ICP-OES may suffer from annoying nebulizer disturbances when concentrated solutions are used but, with properly diluted solutions, all major and many trace elements can routinely be analyzed in 50-mg rock samples. MWP-OES on the other hand is poorly suited for trace element determinationsA comparative study has been made of different dissolution and calibration methods for analyses by optical emission spectrometry (OES) utilizing inductively coupled plasma (ICP) and capacitively coupled microwave plasma (MWP) as excitation sources. The test substances were geological standard rocks, in which SlO2, Al2O3, TiO2, Fe2O3, MnO, MgO CaO, Na2O, Ba, and some traces were determined. The results show that analyses by MWP-OES are severely disturbed by matrix effects; only in the presence of large quantities of ionization buffers e.g., [Sr(NO3)2] can MWP-OES yield rock analyses of very good quality. No buffers are needed for analyses by ICP-OES, for which the matrix effects are remarkably low. ICP-OES may suffer from annoying nebulizer disturbances when concentrated solutions are used but, with properly diluted solutions, all major and many trace elements can routinely be analyzed in 50-mg rock samples. MWP-OES on the other hand is poorly suited for trace element determinations. © 1979 American Chemical Society.
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| 83. |
- Burman, Jan-Ola, et al.
(author)
-
Geochemical analyses by-plasma spectroscopy
- 1977
-
In: GFF. - : Informa UK Limited. - 1103-5897 .- 2000-0863. ; 99:2, s. 102-110
-
Journal article (peer-reviewed)abstract
- Microwave plasma (MWP) and inductively coupled plasma (ICP) have been used as excitation sources in spectroscopic analyses. The results show that MWP and ICP sources are excellent for spectroscopic determinations of a large number of major, minor and trace constituents in various geological materials. The low detection limits, the restricted matrix effects and the large number of elements that can easily be determined in a single process make MWP and ICP spectroscopy superior to atomic absorption and X-ray spectroscopy in many geochemical studies.
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| 84. |
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| 85. |
- Burns, K.L, et al.
(author)
-
The Flinders Ranges breccias of South Australia diapirs or décollement?
- 1977
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In: Journal of the Geological Society. - : Geological Society of London. - 0016-7649 .- 2041-479X. ; 134:3, s. 363-384
-
Journal article (peer-reviewed)abstract
- Breccia-cored domes in the Northern Flinders Ranges, South Australia, have been regarded as diapirs analogous to diapiric salt structures in northwestern Germany and the Gulf Coast. It is shown that the core of the Blinman Dome is not intrusive and is not composed of less dense rocks; hence a diapiric process cannot apply. It is suggested that much of the breccia of the core is formed by deformation of a stratigraphic unit composed of interbedded competent and incompetent beds at a Flinders Ranges dgcollernent and results from folding. If this model is correct, the Flinders Ranges structures should occur at ddcollements in other parts of the world.
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| 86. |
- Bylund, Göran, et al.
(author)
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The Caledonian Research Project (CRP): A Swedish contribution to the International Geodynamics Project (IGP)
- 1976
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In: GFF. - : Informa UK Limited. - 1103-5897 .- 2000-0863. ; 98:2, s. 99-110
-
Journal article (peer-reviewed)abstract
- The Swedish contribution to the International Geodynamics Project (IGP) is concentrated in two major fields of research, the Caledonian Research Project and the Study of Postglacial Earth.Movements. Both projects are financed by the Swedish Natural Science Research Council This paper summarizes the research activities of the Caledonian Research Project (CRP). The IGP-CRP is an inter-disciplinary study involving geologists and geophysicists with a wide range of interests and drawn from institutions in Göteborg, Lund, Luleå, Stockholm and Uppsala. Various collaborative projects with foreign institutions are in progress. Research is concentrated geographically in a Geotraverse some 300 km long and 200 km wide, extending from the Caledonian Front in the vicinity of Östersund to the Norwegian coast west of Trondheim. CRP research is organized in nine subprojects, namely, Basement and Deep Structure, Basement—Cover Relationships, the Särv Nappe, the Seve—Köli Nappe Complex and Higher Tectonic Units, Pre-orogenic History, Palaeo-magnetism, Experimental and Theoretical Tectonics, Experimental and Theoretical Studies of the Mechanism of Rock Deformation, and Experimental and Theoretical Studies of Metamorphism within the Geotraverse Area. Priority is given to research leading to a better understanding of crustal movements during the Caledonian evolution, during both the accumulation of the late Pre-Cambrian to Devonian sequences and their orogenic deformation.
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| 87. |
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| 88. |
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| 89. |
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