RESEARCH GROUP

button mineral resources
Mineral Resources and Geofluids
 

Ore Deposits Introductory Course

Prof. Lluís Fontboté and collaborators

 

Slides to Chapter F

Felsic intrusions. Part I: phanerocrystalline textures
Pegmatites, greisen and skarn

 

Campanillas

Native gold (yellow) in a quartz vein (white and light grey) with hematite disseminations (brown),
garnet (dark green), and pyroxene (light green) in the Nambija skarn, Campanillas Mine, Ecuador.
Striking feature in this oxidized gold skarn are the high gold grades and the low metal and sulfur contents.
Width of photo: 3.2 cm. Photograph ©: L. Fontboté 2003
Click on the picture for an enlarged version of this photograph.

More on the Nambija skarn:

*Chiaradia, M.*, *Vallance, J.*, *Fontboté, L.*, Stein, H., *Schaltegger, U.*, Coder, J., Richards, J., Villeneuve, M., and Gendall, I. (2009) U-Pb, Re-Os, and 40Ar/39Ar geochronology of the Nambija Au skarn and Pangui porphyry-Cu deposits, Ecuador: implications for the Jurassic metallogenic belt of the Northern Andes. Mineralium Deposita 44: 371–387
http://www.springerlink.com/content/281g310101np6471/?p=8c26b5016b754052a2d455bef12aef56&pi=12

*Vallance, J., Fontboté, F., Chiaradia, M., Markowski, A. Schmidt, S.* and Vennemann, T. (2009) Magmatic-dominated fluid evolution in the Jurassic Nambija gold skarn deposits (southeastern Ecuador). Mineralium Deposita 44: 389–413
http://www.springerlink.com/content/y10l7h20819x2036/?p=5a6f496b8b374c469b07066155960e97&pi=2

 

himalaya mine

Himalaya mine (Mesa Grande Dist., San Diego Co., California, USA)
Gem bearing pocket in pegmatite-aplite dike. This pocket was opened on 15.02.1989
Photo Pierre Perroud, 1989.02.15 - Copyright © 2001 - Pierre Perroud - All Rights Reserved

himalaya mine

Two minutes later! Gem quality Tourmaline var. Rubellite.
Photo Pierre Perroud, 1989.02.15 - Copyright © 2001 - Pierre Perroud - All Rights Reserved

 

[Mineral Resources and Geofluids]

 


mlevy
Send comments on page to mail pp