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Part 4: Uncommon Magmatic Structures in Granites of the Borborema Province

Roberto Weinberg, Monash University, Australia

 

 

Copyright 2004-2011 by Roberto Weinberg. All rights reserved. Unlimited permission to copy or use is hereby granted for non-profit driven enterprise, subject to inclusion of this copyright notice and acknowledgment of the source URL: users.monash.edu.au/~weinberg.

 

I would very much appreciate an email stating how this material will be used: Roberto Weinberg, Monash University, Australia. Thanks, RW.

 

DISCLAIMER. The material on this website has not undergone the scrutiny of Monash University and does not conform to its corporate web design. It is entirely based on a free-spritied, curiosity-driven research effort by the author, and therefore in no way expresses the official position of the University.

 

Magmatic Structures Continued

  • Feldspar Deformation: Magmatic and Solid-State
  • Dendritic Feldspar

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    Magmatic and Subsolidus Feldspar Deformation

    Some beautiful megacryst deformation in Itaporanga and Pedra Mijada plutons. In Itaporanga many megacrysts are bent as in (A) suggesting squeezing of interstitial magmas and megacryst deformation

    A) Squeezed and bent cumulate K-feldspar. Is this magmatic?

     

    bent K-feldspar phenocryst

     

    B) Tail in K-feldpar megacryst (5 cm long), accompanied by other grains with no tails.

    tail in K-feldspar phenocryst, recrystallization

     

    C) Solid-state zoned K-feldspar from Pedra Mijada Pluton for comparison

    zoned K-feldspar phenocryst, deformed

     

     

    Dendritic K-feldspar in Boqueirao pluton

    dendritic K-feldspar

     

     

    Liked the structures? Want to know more? Contact me on my email