caa a22 4500 465791875 CHVBK 20180323112027.0 cr unu---uuuuu 170327e19901201xx s 000 0 eng 10.1007/BF00306413 doi (NATIONALLICENCE)springer-10.1007/BF00306413 Ion microprobe study of intragrain micropermeability in alkali feldspars [Elektronische Daten] [F. David, L. Walker] Alkali feldspar cleavage fragments from the Klokken layered syenite, South Greenland, were heated to 700°C at 0.1 GPa in 99% H2 18O for 75 h. These samples were then polished and imaged by ion microprobe for 18O. The feldspars were known to contain areas of pristine, braid micro-perthite which were not turbid and areas of deuteric patch perthite which were turbid. Turbidity is related to the presence of micropores in the feldspars. On imaging the grain, it was found that the 18O had penetrated into the parts of the grain which were microporous and not into the pristine areas. Micropores are therefore responsible for rendering the feldspars permeable as well as porous. The implications of micropermeable feldspars in several areas of geology are discussed. Springer-Verlag, 1990 David F. Department of Geology and Geophysics, Grant Institute of Geology, University of Edinburgh, King's Buildings, EH9 3JW, Edinburgh, Scotland aut Walker L. Department of Geology and Geophysics, Grant Institute of Geology, University of Edinburgh, King's Buildings, EH9 3JW, Edinburgh, Scotland aut Contributions to Mineralogy and Petrology Springer-Verlag 106/1(1990-12-01), 124-128 0010-7999 106:1<124 1990 106 410 https://doi.org/10.1007/BF00306413 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00306413 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- David F. Department of Geology and Geophysics, Grant Institute of Geology, University of Edinburgh, King's Buildings, EH9 3JW, Edinburgh, Scotland aut NATIONALLICENCE 700 1- Walker L. Department of Geology and Geophysics, Grant Institute of Geology, University of Edinburgh, King's Buildings, EH9 3JW, Edinburgh, Scotland aut NATIONALLICENCE 773 0- Contributions to Mineralogy and Petrology Springer-Verlag 106/1(1990-12-01), 124-128 0010-7999 106:1<124 1990 106 410 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer