Google analytics Link

Part 2: Uncommon Magmatic Structures in Granites of the Borborema Province

Roberto Weinberg, Monash University, Australia

 

Part 1 

 

 

Magmatic Structures Continued

 

  • Granite Layering
  • Ellipsoids and Snails
  • Diapirs
  •  


     

    Granite Layering

    A) Complex schlieren pattern, Tavares pluton

    complex schlieren

    B) Detail of A) showing shearing of schlieren

    complex schlieren

     

    C) Layering, Itaporanga Pluton

    magmatic layering

     

    D) Layering, Itaporanga Pluton

    magmatic layering

     

    E) Detail of D)

    magmatic layering

     

     

    F) Layering, Serra Branca pluton

    magmatic layering

     

    G) Curved layering, Serra Branca pluton

    curved magmatic layering

     

     

    H) Complex layering forming an elliptical shape, only half the ellipse shown , Serra Branca pluton

    elliptical magmatic layering

     

     


    Magmatic Ellipsoids and Snails

    Ellipsoids in Tavares pluton

     

    A) Three ellipsoids, Tavares pluton

    elliptical magmatic layering

     

    B) Ellipsoid, Tavares

    elliptical magmatic layering

     

     

    Ellipsoids in tonalitic Tanzawa pluton, Japan, courtesy of Dr Tetsuo Kanamaru, Kobe University, and Dr Ryo Anma, Tsukuba University

     

    elliptical magmatic layering
    elliptical magmatic layering

     

    Magmatic Snails

     

    A) Snail structure, Tavares pluton

    elliptical magmatic layering

     

    B) Snail structure, Tavares pluton

    elliptical magmatic layering

     

     


    Magmatic Diapirs, Tavares pluton

     

    A) Diapir delineated by schlieren

    diapirs

     

    B) Enclave-rich diapir in granite

    diapirs

     

    C) Diapir with poorly developed ladder structure along stem

    ladder dykes/dikes

     

    D) Magma channel depicted by schlieren margin. Diapir stem?

    ladder dykes/dikes

     

     


     

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