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Personen: Den Brok, B. (Autor) 
Passchier, Cornelis Willem (Autor) 
Sieber, M. (Autor) 
  
Titel: Fibre growth in wet salt aggregates in a temperature gradient field
  
Quelle: Mineralogical magazine. Bd. 62. H. 4. London : Mineralogical Society. S. 527 - 532
Erscheinungsjahr:    1998
ISBN / ISSN: 0026-461X
URL der Originalveröffentlichung http://rruff.info/doclib/MinMag/Volume_62/62-4-527.pdf
  
Dokumentart:
Zeitschriftenaufsatz Zeitschriftenaufsatz
Sprache: Englisch
Open Access: OpenAccess
Person der Universität:    Passchier, Cornelis Willem  In UnivIS suchen 
Einrichtung: Institut für Geowissenschaften
DDC-Sachgruppe:    Geowissenschaften
ID: 52630  Universitätsbibliothek Mainz
Hinweis:
Informationen zu den Nutzungsrechten unserer Inhalte Informationen zu den Nutzungsrechten unserer Inhalte
Abstract: Intense fibrosity develops in wet porous NaCl crystal aggregates (grain size 250-500 mu m) held in a temperature (T) gradient field (0.5-4 degrees C/mm) at temperatures between 20 and 50-60 degrees C. In situ microscopic observation of the process shows that fibre growth is associated with T-gradient driven motion of tiny gas (air, water vapour) bubbles present in the saturated intercrystalline aqueous NaCl solution. Gas bubbles move through the intercrystalline pore fluid into the cold direction. They only move if they are next to an NaCl crystal; bubbles that are 'free' do not move. Each bubble is 'pushed' into the cold direction by a growing crystal fibre of the same diameter as the bubble itself. Fibres apparently grow due to oversaturation of the NaCl solution at the hot side of the gas bubble. Crystals dissolve at the cold side of the gas bubbles, apparently by undersaturation of the NaCl solution there. Thus, bubbles dissolve their way through NaCl-crystals and aggregates. Intense fibrosity develops within weeks.
   
  
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