The Relationship between Petrology and Nd Isotopes as Evidence for Contrasting Anorogenic Granite Genesis: Example of the Corsican Province (SE France)

Poitrasson, Franck; Duthou, Jean-Louis; Pin, Christian

doi:10.1093/petrology/36.5.1251

Cited by 103 publications

(64 citation statements)

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“…These data suggest that saturation temperatures for both associations were similar, and close to 850-900 • C, comparable to estimates obtained for A-type granites worldwide (Turner et al 1992, Poitrasson et al 1995, King et al 1997. The monzodioritic rocks, typically undersaturated in Zr at liquidus conditions, yield T Ap around 1000 • C, probably very close to the liquidus temperatures for these magmas.…”

Section: Liquidus Temperaturessupporting

confidence: 86%

The Serra da Graciosa A-type granites and syenites, southern Brazil. Part 1: regional setting and geological characterization

Gualda

Vlach

2007

An. Acad. Bras. Ciênc.

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The Serra da Graciosa region includes important occurrences of granites and syenites of the Graciosa A-type Province (formerly Serra do Mar Suite), southern Brazil. Using fieldwork, petrography, and remote sensing imagery, we characterize the geology of the plutons in the region. Five individual plutons were recognized. Two correspond to the previously defined Marumbi and Anhangava Plutons. We divide the former "Graciosa Pluton" into three new plutons: Capivari, Órgãos, and Farinha Seca. The plutons are elliptical with northeast-southwest orientation. Two petrographic associations can be recognized: an alkaline association that includes peralkaline and metaluminous hypersolvus alkalifeldspar granites and syenites (Anhangava, Farinha Seca, Órgãos), and an aluminous association composed of metaluminous and weakly peraluminous subsolvus granites (Capivari, Órgãos, Anhangava, Marumbi). Occurrences of each association are limited to one individual pluton or to portions of a pluton, and the age relationships are not well established. Monzodioritic rocks are found marginal to the Órgãos and Farinha Seca Plutons, and interaction with silicic magmas locally produced hybrid quartz syenites (Farinha Seca Pluton). Geothermobarometry indicates emplacement at shallow crustal levels (P = 2 ± 0.6 kbar), and crystallization temperatures within the interval 900-700 • C for the granitic and syenitic rocks, and 1000-750 • C for the monzodioritic rocks.

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Section: Liquidus Temperaturessupporting

confidence: 86%

The Serra da Graciosa A-type granites and syenites, southern Brazil. Part 1: regional setting and geological characterization

Gualda

Vlach

2007

An. Acad. Bras. Ciênc.

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“…Most samples gave temperatures close to 800 °C, a value significantly lower than temperature estimates obtained for similar plutons from the Graciosa Province (Gualda and Vlach 2007a) and A-type granites elsewhere (e.g. Poitrasson et al 1995, King et al 1997, King et al 2001, in the range 850 -900 °C. Apatite saturation temperatures are always higher (800 -897 °C), with a mean of 834 °C.…”

Section: Crystallization Conditionsmentioning

confidence: 64%

“…The diversity of rock types, with contrasting petrographic and geochemical signatures (e.g. Whalen et al 1987, Eby 1992, Poitrasson et al 1995, King et al 1997 Archean rocks (to the west) and the Neoproterozoic granitoid rocks of the Paranaguá Domain (to the east; Fig. 1a).…”

Section: Introductionmentioning

confidence: 99%

Geology, petrography and geochemistry of the A-type granites from the Morro Redondo Complex (PR-SC), southern Brazil, Graciosa Province

Vilalva

Vlach

2014

An. Acad. Bras. Ciênc.

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The Morro Redondo Complex is one of the most important occurrences of the Graciosa A-type Province, southern Brazil. It consists of the Papanduva and Quiriri granitic plutons and a contemporaneous bimodal volcanic association. The Papanduva Pluton includes massive and deformed peralkaline alkali-feldspar granites with Na-Ca and Na-amphiboles and clinopyroxenes. The deformed types are the most evolved rocks in the province and carry rare 'agpaitic' minerals, some being described for the first time in granites from Brazil. The larger Quiriri Pluton comprises massive, slightly peraluminous, biotite syeno-and monzogranites with rare Ca-amphibole. Biotite compositions are relatively homogeneous, whereas sodic amphiboles and clinopyroxenes show increasing Na and Fe 3+ evolving paths. The Morro Redondo granites are ferroan, with high SiO 2 , alkalis and HFSE contents; the peralkaline types registering the highest fe#. LILE and HFSE abundances increase with the agpaitic index and the most evolved are HHP granites, with radiogenic heat production up to 5.7 μWm -3. Geothermobarometric estimates indicate emplacement under low pressures (~100 MPa), at temperatures up to 850-800 °C, and relatively reduced (QFM) and oxidized (+1 < Δ QFM < +3) environments for the Papanduva and Quiriri Plutons, respectively. In both cases, melts evolved to relatively high oxidation states upon crystallization progress.

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“…This tectonic setting differs from the typical intracratonic setting of Precambrian fayalite bearing granitoids and from the extensional setting of most Phanerozoic fayalite granitoids. Worldwide, the Precambrian fayalite-bearing granitoids are commonly closely associated with rapakivi granites, anorthosite -mangeritecharnockite -granite suites (AMCG), and the Phanerozoic fayalite granitoids to anorogenic ring complexes (e.g., Frost et al, 2002;Poitrasson et al, 1995). The petrogenesis of AMCG suites has been subject of discussion for a long time and its relation with fayalite granitoids is still problematic owing to the suggested different origins for the fayalite granitoids in the different localities where they occur.…”

Section: Comparison With Other Fayalite Granitoids Worldwidementioning

confidence: 99%

“…Most fayalite granitoids occur in Precambrian terrains (e.g., Pikes Peak Batholith, Central Colorado, USA, Smith et al, 2001;Sherman Batholith, Wyoming, USA, Frost et al, 1999;Padthaway Ridge, South Australia, Turner et al, 1992). Only few fayalite granitoids are known from Phanerozoic terrains, e.g., the anorogenic province of Corsica (France) (Poitrasson et al, 1995) and the Tibchi anorogenic ring complex of Nigeria (Mücke, 2003). Fayalite granitoids are characterized by comparatively high overall Fe contents, high FeO/(FeO+MgO) ratios, the occurrence of Fe-rich anhydrous mafic minerals such as fayalite to this unit indicate that metamorphism occurred mainly in the Late Paleozoic (PermoCarboniferous; Willner et al, 2005, Glodny et al, 2006.…”

Section: Introductionmentioning

confidence: 99%

Origin of fayalite granitoids: New insights from the Cobquecura Pluton, Chile, and its metapelitic xenoliths

Vásquez¹,

Glodny²,

Franz³

et al. 2009

Lithos

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Fayalite granitoids of the Cobquecura Pluton, Central Chile, occur in an active continental margin setting, which is unusual for such rocks. They are closely associated with gabbros, and both lithologies contain hercynite-rich, Fe-rich metapelitic xenoliths. The primitive magmas of the Cobquecura Pluton are derived from a mafic source, similar to the regional subarc subcontinental mantle. Sr-Nd-Pb isotope data demonstrate that crustal contributions were important in the petrogenesis of the fayalite granitoids. The crustal contribution, however, does not consist of rocks similar to the regionally exposed Paleozoic basement rocks, but rather resembles partial melts derived from metapelitic rocks at depth. The corresponding restites are the hercynite-rich xenoliths. A relatively high content of rare earth elements and high field strength elements in the fayalite granitoids is linked to selective assimilation of crust. This is evident from the abundant xenoliths that are entrained in the fayalite granitoids, and whose leucosomes are rich in accessory minerals carrying these elements. Such Fe-rich rocks similar to the hercynite-rich xenoliths could have acted as a chemical buffer keeping the oxygen fugacity low, which is crucial for the generation of fayalite bearing granitoids.

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The Relationship between Petrology and Nd Isotopes as Evidence for Contrasting Anorogenic Granite Genesis: Example of the Corsican Province (SE France)

Cited by 103 publications

References 0 publications

The Serra da Graciosa A-type granites and syenites, southern Brazil. Part 1: regional setting and geological characterization

The Serra da Graciosa A-type granites and syenites, southern Brazil. Part 1: regional setting and geological characterization

Geology, petrography and geochemistry of the A-type granites from the Morro Redondo Complex (PR-SC), southern Brazil, Graciosa Province

Origin of fayalite granitoids: New insights from the Cobquecura Pluton, Chile, and its metapelitic xenoliths

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