Petrogenesis of rare-element pegmatites in the Olary Block, South Australia, part 1. Mineralogy and chemical evolution

Lottermoser, Bernd G.; Lu, J.

doi:10.1007/bf01163059

Cited by 24 publications

(13 citation statements)

References 8 publications

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“…Minerals in pegmatites have often been used as geochemical indicators, as well as to estimate the economic potential of these rocks (Shmakin, 1979;Shearer et al, 1985Shearer et al, , 1992CereS, 1992;Neiva, 1995;Mulja et al, 1995;Kontak and Martin, 1997;Lottermoser and Lu, 1997). In order to evaluate the character of the source rock, the petrogenetic link between the different pegmatite types, and between the parental granite and the pegmatites, several processes are considered.…”

Section: Introductionmentioning

confidence: 99%

The granitic pegmatites of the Fregeneda area (Salamanca, Spain): characteristics and petrogenesis

Roda-Robles

Pérez²,

Roldán³

et al. 1999

Mineral. mag.

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Pegmatites of the Fregeneda area, Salamanca, Spain, show a zonal distribution, from barren to enrichment in Li, Sn, Rb, Nb>Ta, B and P. They intrude pre-Ordovician metasediments which were metamorphosed to sillimanite-zone conditions near the Lumbrales granite. Field, mineralogical and petrographic data show the following zonal sequence from the granite outward: (1) barren pegmatites (pegmatites T1, T2, T3 and T4) with quartz, K-feldspar > albite, muscovite, tourmaline _+ andalusite __ garnet; (2) intermediate pegmatites (types T5 and T6), characterized by the occurrence of beryl and Fe-Mn-Li phosphates; and (3) fertile pegmatites (dykes T7 and T8), with lepidolite, cassiterite, columbite, albite > K-feldspar, montebrasite and spodumene.Tourmaline from different pegmatites shows significant compositional variations. Trace element variations in mica and K-feldspar suggest that the origin of the different pegmatitic bodies may be explained by three different paths of fractional crystallization of melts generated by partial melting of quartzo-feldspathic rocks.

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Section: Introductionmentioning

confidence: 99%

The granitic pegmatites of the Fregeneda area (Salamanca, Spain): characteristics and petrogenesis

Roda-Robles

Pérez²,

Roldán³

et al. 1999

Mineral. mag.

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show abstract

“…( Table 3, analysis 9). The Fe contents are even greater than those reported for the apatite in the Olary Block beryl-columbitephosphate pegmatite in Australia (Lottermoser and Lu, 1997) and are probably influenced at least partly by the replaced xanthoxenite. The OH and Cl in the apatite (up to 0.795 a.p.f.u.…”

Section: Fig 5 Diagrams Showing the Alteration Sequences Of Phosphamentioning

confidence: 78%

“…The tripliteÀapatiteÀisokite sequence in the intra-granitic quartz veins suggests an increase in Ca and Mg activity during late-stage hydrothermal alteration (Lottermoser and Lu, 1997). The alteration sequence is indicative of late circulation of Ca-, Mg-and F-rich fluids through fissures.…”

Section: Replacement Texturesmentioning

confidence: 98%

“…Triplite appears to have been the earliest phosphate to crystallize, and is only partly affected by later hydrothermal alteration. This replacement would have been favoured by fractures in an oxidizing, low-temperature environment (<250ºC), as can be inferred from the abundance of Fe 3+ and H 2 O molecules in the structure of the secondary phosphates originating from triplite alteration (Moore, 1973;Lottermoser and Lu, 1997), such as phosphosiderite and rockbridgeite (Fig. 7).…”

Section: Replacement Texturesmentioning

confidence: 99%

“…7). Late fluids with high fluorine concentrations would have allowed the mobilization of alkalis and relatively insoluble elements such as Al and REE (Martin, 1996;Tagirov and Schott, 2001;Tagirov et al, 2002;Bao et al, 2008), which are present in goyazite (Lottermoser and Lu, 1997). The mechanism of formation of goyazite II is probably similar to that of the crandalliteÀgoyazite series in the Beauvoir granite, France (Charoy et al, 2003).…”

Section: Replacement Texturesmentioning

confidence: 99%

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Fe-Mn phosphate associations as indicators of the magmatic-hydrothermal and supergene evolution of the Jálama batholith in the Navasfrías Sn-W District, Salamanca, Spain

Llorens¹,

Moro²

2012

Mineral. mag.

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The residual melts that remained after the consolidation of the Jálama batholith crystallized to form a group of intra-granitic pegmatite dykes, which are hosted by its outermost facies (the External Unit), and the most evolved residual melts migrated through fractures to form the Cruz del Rayo field of pegmatite dykes, which are hosted by pre-Ordovician low-grade metasedimentary rocks. The increasing activity of phosphorus as magmatic differentiation took place led to the crystallization of primary phosphates, including members of the tripliteÀzwieselite and the amblygoniteÀmontebrasite series. A strong albitization of the granitic and pegmatite rocks led to the replacement of the primary assemblage by other phosphates such as alluaudite. The influx of post-magmatic hydrothermal fluids, produced quartz veins, gave rise to the crystallization of ore minerals and triplite, and altered the granites, aplites and pegmatites, replacing some of the phosphate minerals and feldspars and depositing goyazite, montebrasite and childreniteÀeosphorite. The interaction of the residual hydrothermal fluids with those from the surrounding metamorphic rocks during later alteration events resulted in the influx of large quantities of Ca and Mg, and produced phosphate assemblages enriched in those elements. Finally, late goyazite, hydroxylapatite and an unidentified Fe-rich phosphate were formed as a result of supergene alteration by percolating meteoric waters, which added Ca, Sr and other elements into the system, and increased fO 2 .

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Rare earth elements in Australian uranium deposits

Lottermoser

2014

Uranium - Past and Future Challenges

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Petrogenesis of rare-element pegmatites in the Olary Block, South Australia, part 1. Mineralogy and chemical evolution

Cited by 24 publications

References 8 publications

The granitic pegmatites of the Fregeneda area (Salamanca, Spain): characteristics and petrogenesis

The granitic pegmatites of the Fregeneda area (Salamanca, Spain): characteristics and petrogenesis

Fe-Mn phosphate associations as indicators of the magmatic-hydrothermal and supergene evolution of the Jálama batholith in the Navasfrías Sn-W District, Salamanca, Spain

Rare earth elements in Australian uranium deposits

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