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Clays and Clay Minerals; December 2005; v. 53; no. 6; p. 639-652; DOI: 10.1346/CCMN.2005.0530610
© 2005 Clay Minerals Society
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COMPOSITIONAL AND STRUCTURAL VARIATION OF SUDOITE FROM THE BETIC CORDILLERA (SPAIN): A TEM/AEM STUDY

María Dolores Ruiz Cruz1,* and Carlos Sanz de Galdeano

1 Departamento de Química Inorgánica, Cristalografía y Mineralogía, Facultad de Ciencias, Campus de Teatinos, Universidad de Málaga, Spain
2 Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada, Facultad de Ciencias, 18071 Granada, Spain



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  		Figure 1. Tectonic map of the area studied and location of the sections. AA': Diezma section. BB': El Molinillo section.

 


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  		Figure 2. (a) XRD patterns (oriented samples) in the range 2–30°2{theta} of the <2 µm size fractions of the samples studied, showing the mineral assemblages. (b) XRD patterns (randomly oriented samples) in the range 59–65°2{theta} of the <2 µm size fractions of the samples studied, showing the position of the 060 sudoite reflection. Qtz: quartz. Il: illite. Na-K-Il: sodium potassium illite. Dk: dickite. Sud: sudoite. Prl: pyrophyllite. Chl: trioctahedral chlorite.

 


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  		Figure 3. XRD patterns showing the contrasting shapes of the 7 Å reflection of sudoite in samples CL-34 and CL-26.

 


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  		Figure 4. Low-magnification TEM images showing a composite grain sudoite-dickite (a) (sample CL-64) and the sudoite + illite assemblage (b) (sample CL-26). Qtz: quartz. Il: illite. Dk: dickite. Sud: sudoite.

 


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  		Figure 5. Lattice-fringe images of sudoite from sample CL-26. (a) Packet with regular 14 Å periodicity. The SAED pattern, viewed along the 110 zone axis, indicates the presence of an ordered polytype. (b) This image shows the presence of scarce 10 Å fringes (arrows) randomly interstratified in the sudoite structure.

 


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  		Figure 6. (a) Lattice-fringe image of a sudoite crystal from sample CL-64, showing the regular 14 Å periodicity. The SAED pattern, viewed along the 110 zone axis, indicates the presence of a disordered polytype. (b) Medium-magnification image of a composite dickite-sudoite grain with dominant 42 Å periodicity. The SAED pattern shows a main 14 Å periodicity and streaking along c*.

 


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  		Figure 7. Lattice-fringe images of sudoite from sample CL-34. (a) Randomly interstratified mica-sudoite mixed layers intergrown with sudoite. Arrows indicate the 10 Å fringes. (b) 1:1 and 1:2 mica-sudoite sequences. The SAED pattern shows a 24 Å periodicity.

 


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  		Figure 8. Lattice-fringe image showing intergrowths and interstratified pyrophyllite-sudoite from sample CL-34. The inset SAED pattern shows reflections of sudoite and pyrophyllite.

 


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  		Figure 9. Electron diffraction patterns characteristic of the phyllosilicates coexisting with sudoite in the samples studied. (a) The pattern of dickite, viewed along the 110 zone axis, shows hhl reflection rows with 14 Å periodicity, characteristic of a two-layer polytype (sample CL-64). (b) This pattern of illite, viewed along the 110 zone axis, shows hhl reflection rows with 10 Å periodicity, characteristic of a 1M polytype (sample CL-64). (c) This pattern of Na-K-illite, viewed along 010 shows h0l reflection rows with 20 Å periodicity (sample CL-26). (d) Pattern of K-illite viewed along 110, showing hhl reflection rows with 20 Å periodicity, characteristic of a 2M1 polytype (sample CL-34). (e) Pattern of pyrophyllite viewed along the 110 zone axis. This shows hhl reflection rows with 18 Å periodicity, characteristic of a two-layer polytype (Sample CL-34). (f) Pattern of trioctahedral chlorite (sample CL-34).

 


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  		Figure 10. Plots of significant chemical data (AEM) of sudoite. {blacksquare}: analyses from sample CL-34. x: analyses from sample CL-64. {triangleup}: analyses of Mg-rich sudoites from sample CL-26.

 


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  		Figure 11. Plot of the chemical characteristic of sudoites on a Si-Al-(Fe+Mg) ternary diagram. {blacksquare}: analyses from sample CL-34. x: analyses from sample CL-64. {triangleup}: Mg-rich sudoites from sample CL-26. The composition of coexisting illite (Il), pyrophyllite (Prl), dickite (Dk) and trioctahedral chlorites (Chl) have also been plotted.

 




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