Pegmatite genesis: state of the art

Simmons, William B.; Webber, Karen L.

doi:10.1127/0935-1221/2008/0020-1833

Cited by 221 publications

(93 citation statements)

References 43 publications

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“…Such a magma, containing both crustally and mantle-derived components, could have been responsible for LCT-and NYF-type pegmatite formation (Martin and De Vito 2005;Simmons and Webber 2008). It could have been the case also for the GSB pegmatites, showing either the NYF evolving to an LCT, or only LCT, signatures.…”

Section: Classification Of the Lutomia Pegmatitementioning

confidence: 99%

A phosphate-bearing pegmatite from Lutomia and its relationships to other pegmatites of the Góry Sowie Block, southwestern Poland

Włodek¹,

Grochowina²,

Gołębiowska³

et al. 2015

J. Geosci.

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A geochemically primitive, moderately fractionated, LCT pegmatite from Lutomia (Góry Sowie Block, SW Poland) has been characterized in respect of the primary and secondary phosphate assemblages. The pegmatite crystallized from anatectic granitic magmas mobilized by M 2-3 metamorphism at ~370-380 Ma. Three phosphate assemblages had a different origin: (1) the primary, magmatic one [graftonite-(I)-beusite-(I) + triphylite ± sarcopside], (2) a secondary, metasomatic one [Ca-rich graftonite-(II) -Ca-rich beusite-(II) + wolfeite/triploidite/stanĕkite + hagendorfite/alluaudite + kryzhanovskite ± a Ca-bearing phosphate close to ferromerrillite + fluorapatite], and (3) a secondary, hydrothermal and weathering one [ferrisicklerite ± heterosite + phosphoferrite-kryzhanovskite + ludlamite + vivianite ± hureaulite + earlshannonite-whitmoreite + strunzite-ferrostrunzite + beraunite + dufrénite + jahnsite-(CaMnFe), -(CaMnMn) and -(MnMnMn) + landesite + fairfieldite + Mn 2+ -bearing hydroxyapatite]. The magmatic assemblage resulted from the breakdown of a primary, high-T, Ca-and Li-enriched graftonite-like phase. It was induced by cooling and elevated incompatible Ca, Na, Li and F concentrations. The metasomatic assemblage reflects the destabilization of the magmatic phosphates and their Ca-and Na-metasomatism by a high-T fluid connected with a PO 4 -bearing melt, which previously had evolved along with graftonite-(I)-beusite-(I). The assemblage of secondary, hydrothermal and weathering, phosphates was a result of lower T alteration by hydrothermal fluids and meteoric water by both topotactic Fe and Mn oxidation as well gradual hydration and Fe oxidation. Taken together, the Lutomia pegmatite has been compared to the phosphate-bearing pegmatite at Michałkowa and the mixed NYF + LCT, PO 4 -poor pegmatitic system of Piława Górna.Keywords: phosphate-bearing pegmatite, LCT anatectic pegmatite, Lutomia, Poland Received: 16 October 2013; accepted: 25 November 2014; handling editor: Milan Novák The online version of this article (doi: 10.3190/jgeosci.185) contains supplementary electronic material.Moreover, Łodziński and Sitarz (2009) studied graftonite and sarcopside from Michałkowa.The aim of this paper is a description of the Lutomia pegmatite, as the currently best representative of phosphate pegmatitic mineralization in the GSB, and an evaluation of its relationships to the other important pegmatites in the unit. Particular attention is being paid to textural relations and chemical compositions of the minerals that reflect the geochemical evolution of the pegmatiteforming melts.

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Section: Classification Of the Lutomia Pegmatitementioning

confidence: 99%

A phosphate-bearing pegmatite from Lutomia and its relationships to other pegmatites of the Góry Sowie Block, southwestern Poland

Włodek¹,

Grochowina²,

Gołębiowska³

et al. 2015

J. Geosci.

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“…In other cases, some combination of textural, mineralogical, geochemical, isotopic, and geochronological information provide evidence for a genetic link (Pilbara Craton, Australia: Sweetapple and Collins, 2002). Simmons and Webber (2008) noted that LCT pegmatites surrounding an inferred parental granite cannot be traced to source body via a feeder dike. Zagorsky (2009) suggested that, in certain cases, geochemical and geochronologic data contradict the perceived relation between pegmatites and spatially related granites, suggesting that these pegmatites and granites may be likened to brothers and sisters rather than parents and children.…”

Section: Relations To Igneous Rocksmentioning

confidence: 99%

“…In the latter half of the 1900s, one of the most influential researchers was Richard Jahns, who proposed that complex pegmatites form an aqueous vapor phase that separates from a silicate melt phase (Jahns and Burnham, 1969). Recent treatments of pegmatite petrogenesis include those by London (2005aLondon ( , 2008London ( , 2014, Simmons and Webber (2008), and Thomas and others (2012). Based in part on high-temperature petrologic experiments, London (1992London ( , 2005a developed the idea of constitutional zone refining.…”

Section: History Of Pegmatite Researchmentioning

confidence: 99%

“…Despite major strides in understanding of LCT pegmatites (London, 2005a(London, , 2008(London, , 2011(London, , 2014Simmons and Webber, 2008;Thomson and others, 2012), a key question remains: why are some orogenic belts well endowed with LCT pegmatites whereas others are poorly endowed? As mentioned in Section 4.1, connections between LCT pegmatites and tectonics have yet to be unraveled at the level of detail that would bear on deposit genesis or aid in exploration.…”

Section: Knowledge Gaps and Future Research Directionsmentioning

confidence: 99%

“…At about the same time, Martin and De Vito (2005) advocated a petrogenetically based classification, with LCT pegmatites being related to S-type, or more rarely, I-type, orogenic granites and NYF pegmatites being related to anorogenic, A-type granites. London (2008) and Simmons and Webber (2008) presented overviews of previous classifications.…”

Section: History Of Pegmatite Researchmentioning

confidence: 99%

See 2 more Smart Citations

Mineral-deposit model for lithium-cesium-tantalum pegmatites

Bradley¹,

McCauley²,

Stillings³

2017

Scientific Investigations Report

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Nb‐Ta‐Sn‐W Distribution in Granite‐related Ore Systems

Hulsbosch

2019

Geophysical Monograph Series

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Tantalum, niobium, tin, and tungsten mineralization typically occurs worldwide in close proximity to fractionated peraluminous leucogranites. These granite-related ore deposits show a diversity of mineralization modes, ranging from plutonic-hosted breccia and hydrothermal vein-stockwork systems to (peri)batholitic greisens, skarns, pegmatites, and hydrothermal veins. In the Mesoproterozoic Karagwe-Ankole orogenic belt (KAB) of Central Africa, numerous early Neoproterozoic Nb-Ta-Sn-W rare-metal deposits formed as primary mineralization in hydrothermal quartz veins, magmatic lithium-cesium-tantalum (LCT) family pegmatites and associated intrapegmatitic greisens. This chapter reviews the petro-and metallogenesis of Nb-Ta-Sn-W graniterelated ore deposits, as they occur in the Rwandese part of the KAB, and provides a general overview of the geochemical mechanisms behind the formation of pegmatite-and quartz vein-hosted deposits and the distribution and enrichment of the ore elements Nb, Ta, Sn, and W in the different metallogenic subsystems (i.e., granites, pegmatites, and veins). Moreover, this chapter assesses the observed close spatiotemporal association between leucogranites, pegmatites, and quartz veins in terms of a direct genetic link between the mineralization and the felsic magmatism. Based on this review and element distribution calculations, an integrated orthomagmatic metallogenic model for Nb-Ta-Sn-W mineralization in the KAB is demonstrated. This model can form a major tool in the exploration for granite-related ore deposits in general.

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Pegmatite genesis: state of the art

Cited by 221 publications

References 43 publications

A phosphate-bearing pegmatite from Lutomia and its relationships to other pegmatites of the Góry Sowie Block, southwestern Poland

A phosphate-bearing pegmatite from Lutomia and its relationships to other pegmatites of the Góry Sowie Block, southwestern Poland

Mineral-deposit model for lithium-cesium-tantalum pegmatites

Nb‐Ta‐Sn‐W Distribution in Granite‐related Ore Systems

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