Nguyen-Thanh, L. ; Ferreiro Mählmann, R. ; Hoang-Minh, T. ; Petschick, R. ; Reischmann, T. ; Nesbor, H. D. ; Ruttmann, M. ; Fritsche, J. G. (2021)
Clay mineral formation in Permian rocks of a geothermal borehole at Northern Upper Rhine Graben, Germany.
In: International Journal of Earth Sciences, 110 (4)
doi: 10.1007/s00531-021-02022-y
Artikel, Bibliographie
Dies ist die neueste Version dieses Eintrags.
Kurzbeschreibung (Abstract)
Hydrothermally altered rhyolite rocks in the Permian Donnersberg Formation of a geothermal borehole in the Northern Upper Rhine Graben (Germany) were investigated to find out answers for the low hydraulic conductivity of the rocks. The composition of clay minerals and the temperature of smectite–illite transformation were carried out using X-ray diffraction, X-ray fluorescence, transmission electron microscopy, Fourier transform infrared spectroscopy, and polarized-light microscopy analyses. Clay mineral (CM) composition includes illite/muscovite (1M and 2M₁ polytypes), illite–smectite interstratifications (IS-ml), smectite, and chlorite; and non-clay minerals such as quartz, feldspars, epidote, calcite, dolomite, and hematite were detected. The 2M1-polytype mica might be the only primary sheet silicates from the parent rocks, while the others occur as authigenic neo-formed CMs under heat flow and geothermal gradient. The development of CMs indicates different mechanisms of illitization and smectitization. Based on the texture, morphology, structure/polytype, and chemistry of rocks and minerals, in particular CMs, the study grouped the CM formation into three transformation processes: smectitization during magma cooling and possible contact metamorphisms with decreasing and low temperature, smectite illitization controlled by burial diagenesis and hydrothermal alteration, and illite smectitization followed exhumation and Cenozoic subsidence with decreasing temperature. The rhyolites were altered to all of the orders IS-R0, IS-R1, and IS-R3 by the dissolution-precipitation and layer-to-layer mechanisms. The first one supported small xenomorphic plates and flakes of 1Md, elongated particles of 1M, and pseudo-hexagonal forms of 2M₁. The second one could lead to the platy particles of 1Md and 2M₁ polytypes. The dominant temperature range for the transformation in the area has been 140–170 °C– ~ 230 °C.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2021 |
| Autor(en): | Nguyen-Thanh, L. ; Ferreiro Mählmann, R. ; Hoang-Minh, T. ; Petschick, R. ; Reischmann, T. ; Nesbor, H. D. ; Ruttmann, M. ; Fritsche, J. G. |
| Art des Eintrags: | Bibliographie |
| Titel: | Clay mineral formation in Permian rocks of a geothermal borehole at Northern Upper Rhine Graben, Germany |
| Sprache: | Englisch |
| Publikationsjahr: | 27 März 2021 |
| Verlag: | Springer |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | International Journal of Earth Sciences |
| Jahrgang/Volume einer Zeitschrift: | 110 |
| (Heft-)Nummer: | 4 |
| DOI: | 10.1007/s00531-021-02022-y |
| URL / URN: | https://link.springer.com/article/10.1007/s00531-021-02022-y |
| Zugehörige Links: | |
| Kurzbeschreibung (Abstract): | Hydrothermally altered rhyolite rocks in the Permian Donnersberg Formation of a geothermal borehole in the Northern Upper Rhine Graben (Germany) were investigated to find out answers for the low hydraulic conductivity of the rocks. The composition of clay minerals and the temperature of smectite–illite transformation were carried out using X-ray diffraction, X-ray fluorescence, transmission electron microscopy, Fourier transform infrared spectroscopy, and polarized-light microscopy analyses. Clay mineral (CM) composition includes illite/muscovite (1M and 2M₁ polytypes), illite–smectite interstratifications (IS-ml), smectite, and chlorite; and non-clay minerals such as quartz, feldspars, epidote, calcite, dolomite, and hematite were detected. The 2M1-polytype mica might be the only primary sheet silicates from the parent rocks, while the others occur as authigenic neo-formed CMs under heat flow and geothermal gradient. The development of CMs indicates different mechanisms of illitization and smectitization. Based on the texture, morphology, structure/polytype, and chemistry of rocks and minerals, in particular CMs, the study grouped the CM formation into three transformation processes: smectitization during magma cooling and possible contact metamorphisms with decreasing and low temperature, smectite illitization controlled by burial diagenesis and hydrothermal alteration, and illite smectitization followed exhumation and Cenozoic subsidence with decreasing temperature. The rhyolites were altered to all of the orders IS-R0, IS-R1, and IS-R3 by the dissolution-precipitation and layer-to-layer mechanisms. The first one supported small xenomorphic plates and flakes of 1Md, elongated particles of 1M, and pseudo-hexagonal forms of 2M₁. The second one could lead to the platy particles of 1Md and 2M₁ polytypes. The dominant temperature range for the transformation in the area has been 140–170 °C– ~ 230 °C. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Technische Petrologie |
| Hinterlegungsdatum: | 27 Apr 2021 05:21 |
| Letzte Änderung: | 27 Mär 2024 06:57 |
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Clay mineral formation in Permian rocks of a geothermal borehole at Northern Upper Rhine Graben, Germany. (deposited 26 Mär 2024 14:12)
- Clay mineral formation in Permian rocks of a geothermal borehole at Northern Upper Rhine Graben, Germany. (deposited 27 Apr 2021 05:21) [Gegenwärtig angezeigt]
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