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Redskin Granite: a rare-metal-rich Precambrian pluton, Colorado, USA

Published online by Cambridge University Press:  05 July 2018

G. A. Desborough ,
S. D. Ludington  and
W. N. Sharp
G. A. Desborough
Affiliation:
US Geological Survey, Denver, Colorado, USA
S. D. Ludington
Affiliation:
US Geological Survey, Denver, Colorado, USA
W. N. Sharp
Affiliation:
US Geological Survey, Denver, Colorado, USA
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Summary

The Precambrian Redskin stock is a high-silica alkalic granite that forms a late pluton related to the 1000 Ma-old Pikes Peak batholith. Zircon, fluorite, fluocerite, ilmenorutile, columbite, biotite, magnetite, and hematite are the most abundant accessory minerals. Thorite, monazite, and xenotime are sparse, and cassiterite and topaz very rare. The principal residences of Sn, Nb, and Ta are ilmenorutile and columbite. The occurrence of cassiterite intergrown with biotite and columbite and the high contents of Nb and Ta in cassiterite are evidence that cassiterite is also a primary mineral. The high concentrations of certain trace elements indicate a high degree of fractionation of magma prior to emplacement of the Redskin Granite. An extremely low crystallization temperature for the granite is indicated by the compositions of albite and K-feldspars, the presence of Fe-rich dioctahedral mica, the absence of Ti in magnetite, and the low content of Ti in biotite. This low crystallization temperature seems due largely to the high concentrations of F, Rb, and other volatile elements in the magma.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 332 , December 1980 , pp. 959 - 966
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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