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

Desborough, George A.; Ludington, Steve; Sharp, William N.

doi:10.1180/minmag.1980.043.332.01

Cited by 12 publications

(5 citation statements)

References 8 publications

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Section: Pegmatite Compositions and Regional Zonationmentioning

confidence: 99%

Granitic pegmatites

London¹

1996

The Third Hutton Symposium on the Origin of Granites and Related Rocks

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The primary focus of this review is on P-T conditions, mineralogical indicators of melt or fluid composition and textural evolution; lesser treatment is given to pegmatite sources or to pegmatite-wallrock interactions. Investigations of stable and radiogenic isotopes have revealed that the source materials for pegmatites are likely to be more heterogeneous or varied than previously thought, especially for peraluminous pegmatites, but that overall pegmatites bear a clear intrusive relationship with their hosts, as opposed to an origin in situ. The P-T conditions of crystallisation of some lithium-rich pegmatites have been constrained by lithium aluminosilicate stability relations in combination with stable isotope or fluid inclusion methods. Experimental studies have elucidated the effects of components such as Li, B, P and F, which are common in some classes of pegmatites, to liquidus relations in the hydrous haplogranite system. Experimentation has also provided corroboration of an old concept of pegmatite crystallisation-that pegmatites owe their distinctive textures and mineral/chemical zonation to relatively rapid crystallisation of melt from the margins inwards at conditions far from the equilibrium (i.e. from supercooled liquids). The origin of aplites, whether alone, layered, or paired with pegmatites, remains an active area of research. Studies of fluid inclusions, crystal-vapour equilibria and wallrock alteration have helped to define the timing and compositions of vapour phases in pegmatites and to aid in the economic evaluation of deposits.

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Section: Pegmatite Compositions and Regional Zonationmentioning

confidence: 99%

Granitic pegmatites

London¹

1996

The Third Hutton Symposium on the Origin of Granites and Related Rocks

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“…(Hawley 1969). The Redskin granite is late, highly evolved phase of the 1 Ga Pikes Peak batholith (Desborough et al 1980). Like some other fundamentally metaluminous systems, it has late muscovite-bearing phases which are associated with the Be-rich muscovite-quartz-fluorite-topaz greisens (inset).…”

Section: Felsic Host Rock S In Non-volcanic Settingsmentioning

confidence: 99%

“…21; Hawley 1969). The Redskin granite is an evolved late phase of the variably alkaline 1.0 Ga Pikes Peak batholith, Colorado (Desborough et al 1980). As a whole the batholith is known for Nb-Y-F-type miarolitic pegmatites that contain genthelvite, phenakite, bertrandite, gadolinite but lack beryl (Levasseur 1997; see next section).…”

Section: Felsic Host Rock S In Non-volcanic Settingsmentioning

confidence: 99%

“…20 Keith et al 1996;Olcott et al 1998 Emerald Gross and Heinrich 1966;Ludington 1981;Simmons et al 1987;Levasseur 1997;Kile and Foord 1998;Smith et al 1999 Variably rare-metal enriched, composite alkaline batholith; Gad, Ph, Hlv, Gnt, present in miarolitic pegmatites typically with Amz-Znw; local areas of F-rich veins and greisens with Brl-Brt Redskin Granite & Boomer Mine, Colorado, USA (see Fig. 21) G (gr) ProtL (1.0 Ga) Hawley et al 1966;Hawley 1969;Desborough et al 1980 Qtz-Ms-Toz greisens along margin of Redskin Bt granite (Pikes Peak derivative) were mined for Brl+Brt (>5Kt @ 2% BeO), minor Wlf-Cst-sulfides…”

Section: Acknowledgmentsmentioning

confidence: 99%

See 1 more Smart Citation

Non-pegmatitic Deposits of Beryllium: Mineralogy, Geology, Phase Equilibria and Origin

Barton

Young

2002

Reviews in Mineralogy and Geochemistry

103

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“…The Pikes Peak batholith (Colorado, U.S.A.) and associated pegmatites of the South Platte and Lake George districts are illustrative of the NYF family (e.g. Wobus & Anderson 1978;Desborough et al 1980;Simmons & Heinrich 1980). The LCT family (Li-Cs-Ta; Cerny 1991) is more varied in apparent source materials (supracrustal metasedimentary sequences plus lower crustal granulites; e.g.…”

Section: Pegmatite Compositions and Regional Zonationmentioning

confidence: 99%

Granitic pegmatites

London¹

1996

Earth and Environmental Science Transactions of the Royal Socie

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ABSTRACT:The primary focus of this review is on P-T conditions, mineralogical indicators of melt or fluid composition and textural evolution; lesser treatment is given to pegmatite sources or to pegmatite-wallrock interactions. Investigations of stable and radiogenic isotopes have revealed that the source materials for pegmatites are likely to be more heterogeneous or varied than previously thought, especially for peraluminous pegmatites, but that overall pegmatites bear a clear intrusive relationship with their hosts, as opposed to an origin in situ. The P-T conditions of crystallisation of some lithium-rich pegmatites have been constrained by lithium aluminosilicate stability relations in combination with stable isotope or fluid inclusion methods. Experimental studies have elucidated the effects of components such as Li, B, P and F, which are common in some classes of pegmatites, to liquidus relations in the hydrous haplogranite system. Experimentation has also provided corroboration of an old concept of pegmatite crystallisation—that pegmatites owe their distinctive textures and mineral/chemical zonation to relatively rapid crystallisation of melt from the margins inwards at conditions far from the equilibrium (i.e. from supercooled liquids). The origin of aplites, whether alone, layered, or paired with pegmatites, remains an active area of research. Studies of fluid inclusions, crystal-vapour equilibria and wallrock alteration have helped to define the timing and compositions of vapour phases in pegmatites and to aid in the economic evaluation of deposits.

show abstract

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

Cited by 12 publications

References 8 publications

Granitic pegmatites

Granitic pegmatites

Non-pegmatitic Deposits of Beryllium: Mineralogy, Geology, Phase Equilibria and Origin

Granitic pegmatites

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