The geochemistry of phosphorus in granite rocks and the effect of aluminium

Беа, Ф.; Ферштатер, Г. Б.; Corretgé, L. G.

doi:10.1016/0024-4937(92)90033-u

Cited by 183 publications

(63 citation statements)

References 28 publications

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“…Thus it is necessary to admit that the role played by the zircon is counterbalanced by major mineral fractionation and by the restricted crystallization of other REE-rich minerals (Chappell, 1999). In this way, the lower content of P (phosphorus) in I-type granitic magmas (Watson and Harrison, 1984;Bea et al, 1992) reduces the amount of REE-rich phosphates (apatite, monazite) or makes impossible their crystallization (e.g. xenotime).…”

Section: Discussionmentioning

confidence: 99%

Genesis and emplacement of felsic Variscan plutons within a deep crustal lineation, the Penacova-Régua-Verín fault: An integrated geophysics and geochemical study (NW Iberian Peninsula)

Martins

Sant'Ovaia

Noronha

2009

Lithos

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Multidisciplinary studies integrating, U-Pb geochronology, whole-rock geochemical data, isotope geochemistry, anisotropy of magnetic susceptibility (AMS) studies and gravimetry were carried out on the Vila Pouca de Aguiar and the Águas Frias-Chaves porphyritic biotite granite plutons. Both plutons occur independently in a distance of about 20 km. The Vila Pouca de Aguiar and Águas Frias-Chaves plutons are examples of late to post-orogenic felsic Variscan granites in northern Portugal (NW Iberian Peninsula). The U-Pb zircon analyses yield a consistent age of 299 ± 3 Ma which is considered to be the emplacement age of the two plutons. These granites are weakly peraluminous, show high HREE and Y (and low P) contents which are consistent with them being I-type. This is also supported by their weakly evolved isotopic compositions, 87 Sr/ 86 Sr i = 0.7044-0.7077 and εNd = − 2.0 to − 2.6, as well as by the whole rock oxygen isotope (δ 18 O VSMOW) ranging from + 9.7‰ to + 11.0‰. The emplacement of granite magma took place after the third Variscan deformation phase (D 3 ) in an extensional tectonic regime, large scale uplift and crustal thinning. The integration of different data suggests that both plutons have the same feeding zone aligned within the Penacova-Régua-Verin fault (PRVF) and that both have the same structure which is related to late Variscan phases. The thicker shape for the Águas Frias-Chaves pluton comparing to that of the Vila Pouca de Aguiar pluton is compatible with different depths of PRVF sectors. The available data led us to propose a model of partial melting of a meta-igneous lower crustal source rather than an open-system of mantle-crust interaction. The interaction between the continental crust and invading mafic magmas could have been limited to mere heat transfer and, perhaps, local intermingling.

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Section: Discussionmentioning

confidence: 99%

Genesis and emplacement of felsic Variscan plutons within a deep crustal lineation, the Penacova-Régua-Verín fault: An integrated geophysics and geochemical study (NW Iberian Peninsula)

Martins

Sant'Ovaia

Noronha

2009

Lithos

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“…Reasons for this proposal include: (1) the metaluminous parental magmas resulting from the partial melts of igneous rocks have low P 2 O 5 contents, consistent with Harrison and Watson's (HW) modal. In spite of low P 2 O 5 content in source rocks, the peraluminous parental magmas derived from the partial melts of sedimentary source rocks may have high P 2 O 5 contents [29], which is not consistent with Harrison and Watson's (HW) modal, The difference in P 2 O 5 contents between both types of parental magmas will become increasingly obvious with the process of fractional crystallization. Futhermore, aluminium saturation index (ASI or ACNK) will increase for both I-type and S-type granites with increasing sedimentary rock components during AFC processes; (2) the acitivity or content of Ca is another important factor controlling the fractional crystallization of apatite.…”

Section: Figurementioning

confidence: 90%

“…This may be the reason why our early Yanshanian granite samples exhibit more I-type granite features in major elements, especially in P 2 O 5 contents, but more S-type granite features in isotopic compotions. Bea et al [29] proposed that the P 2 O 5 content is a more useful criterion than aluminium saturation index (ASI or ACNK) in distinguishing the parental magmas derived from igneous rocks and sedimentary rocks. Reasons for this proposal include: (1) the metaluminous parental magmas resulting from the partial melts of igneous rocks have low P 2 O 5 contents, consistent with Harrison and Watson's (HW) modal.…”

Section: Figurementioning

confidence: 99%

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Petrogenesis of early Yanshanian highly evolved granites in the Longyuanba area, southern Jiangxi Province: Evidence from zircon U-Pb dating, Hf-O isotope and whole-rock geochemistry

Tao

et al. 2013

Sci. China Earth Sci.

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Early Yanshanian (Jurassic) granitoids are widespread in the Nanling Range, South China. Whereas large granitic batholiths commonly crop out in the center of the Nanling Range (corresponding geographically to the central and northern parts of Guangdong Province), many small stocks occur in the southern part of Jiangxi Province. Most of the small stocks are associated closely with economically significant rare-metal deposits (W, Sn, Nb, Ta). Here we report the results for biotite granites and two-mica granites from three Yanshanian stocks of the Longyuanba complex. LA-ICPMS U-Pb dating of zircon yields an age of 156.1±2.1 Ma for Xiaomubei biotite granite, and U-Pb zircon dating using SIMS yields an age of 156.7±1.2 Ma for Longyuanba-Chengjiang biotite granite and 156.4±1.3 Ma for Jiangtoudong two-mica granite. Biotite granites are silica-rich (SiO 2 =70%-79%), potassic (K 2 O/Na 2 O>1.9), and peraluminous (ASI=1.05-1.33). Associated samples are invariably enriched in Rb, Th, Pb and LREE, yet depleted in Ba, Nb, Sr, P and Ti, and their REE pattern shows a large fractionation between LREE and HREE ((La/Yb) N =10.7-13.5) and a pronounced Eu negative anomaly (δEu=0.28-0.41). Two-mica granite samples are also silica-rich (SiO 2 =75%-79%), potassic (K 2 O/Na 2 O>1.2), and peraluminous (ASI=1.09-1.17). However, in contrast to the biotite granites, they are more enriched in Rb, Th, Pb and extremely depleted in Ba, Nb, Sr, P and Ti, and exhibit nearly flat ((La/Yb) N =0.75-1.08) chondrite-normalized REE patterns characterized by strong Eu depletion (δEu=0.02-0.04) and clear tetrad effect (TE 1.3 =1.10-1.14). Biotite granites and two-mica granties have comparable Nd isotopic signatures, and their εNd(t) are concentrated in the 13.0 to 9.6 and 11.5 to 7.7 respectively. Their zircon Hf-O isotopes of both also show similarity (biotite granites: εHf(t)=10.8-7.9, δ 18 O=7.98‰-8.89‰ and εHf(t)= 13.8 to 9.1, δ 18 O=8.31‰-10.08‰; two-mica granites: εHf(t)=11.3 to 8.0, δ 18 O=7.91‰-9.77‰). The results show that both biotite and two-mica granites were derived mainly from sedimentary source rocks with a minor contribution from mantle-derived materials. In spite of some S-type characteristics, the biotite granites were formed by fractional crystallization of I-type magma and assimilation of peraluminous sedimentary rocks during their ascent to the surface. Therefore, they belong to highly fractionated I-type granites. Two-mica granites exhibit a tetrad effect in their REE patterns, but share the same isotopic features with the biotite granites, suggesting that they are highly fractionated I-type granites as well. Their Lanthanide tetrad effects may be attributed to the hydrothermal alteration by magmatic fluids that have suffered degassing at late stages. Granitic magmas undergoing fractional crystallization and wall-rock assilimation can generate highly evolved granites with no REE tetrad effect in the uni-phase system. However, in the late-stage of magmatic evolution in the multi-phase system (i.e., magmatic-hydrothermal s...

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“…temperature of 640-870°C of whole rock TiO 2 -SiO 2 and P 2 O 5 -SiO 2 thermometers (Bea et al, 1992;Green and Pearson, 1986;Harrison and Watson, 1984).…”

Section: Zircon U-pb Dating and Trace Element Characteristicsmentioning

confidence: 99%

The Permian–Triassic granitoids in Bayan Obo, North China Craton: A geochemical and geochronological study

Ling

Zhang

et al. 2014

Lithos

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The geochemistry of phosphorus in granite rocks and the effect of aluminium

Cited by 183 publications

References 28 publications

Genesis and emplacement of felsic Variscan plutons within a deep crustal lineation, the Penacova-Régua-Verín fault: An integrated geophysics and geochemical study (NW Iberian Peninsula)

Genesis and emplacement of felsic Variscan plutons within a deep crustal lineation, the Penacova-Régua-Verín fault: An integrated geophysics and geochemical study (NW Iberian Peninsula)

Petrogenesis of early Yanshanian highly evolved granites in the Longyuanba area, southern Jiangxi Province: Evidence from zircon U-Pb dating, Hf-O isotope and whole-rock geochemistry

The Permian–Triassic granitoids in Bayan Obo, North China Craton: A geochemical and geochronological study

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