F-rich strongly peraluminous A-type magmatism in the pre-Andean foreland Sierras Pampeanas, Argentina: Geochemical, geochronological, isotopic constraints and petrogenesis

Cámera, Matías M. Morales; Dahlquist, Juán A.; Basei, Miguel Ângelo Stipp; Galindo, Carmen; Neto, Mário da Costa Campos; Facetti, Nicolás

doi:10.1016/j.lithos.2016.10.035

Cited by 26 publications

(2 citation statements)

References 85 publications

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“…5b and Table 2) along with the presence of primary muscovite (up to 4.3 vol%; Table 1) are coherent with a strongly peraluminous character typical of S-type granites (e.g., . The plutonic rocks that share chemical features of A-type and S-type granites have been incrementally reported in the last decade (Dahlquist et al, 2013(Dahlquist et al, , 2014Gao et al, 2020;Huang et al, 2011;Morales Cámera et al, 2017, 2020), for which the term "peraluminous A-type granites" has been coined. The Guadalcazar granite besides sharing chemical compositions of A-type and S-type character indicated high Zr-saturation temperatures (869 ± 34 and 848 ± 45 °C; Boehnke et al, 2013;Watson & Harrison, 1983, respectively; Table 2) more typical of A-type granites (> 830 °C; King et al, 2001) rather than S-type (< 760 °C; Chappell et al, 1998).…”

Section: Classification Origin and Magma Sourcementioning

confidence: 99%

Petrogenesis and geodynamic implications of Oligocene A-type granite in the Guadalcazar area, San Luis Potosi, central Mexico

et al. 2022

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The Guadalcazar is located in the Mesa Central (MC) province, which is mainly composed of granitic rocks and is known for its metallogenetic. The granitic rocks contain complex Sn-Hg-Ag-F mineralization and were emplaced during Eocene to Oligocene. However, the source, origin, and evolution of magma and the tectonic setting of this magmatic area have never been explained. In this study, we have conducted petrology, whole-rock geochemistry, and U-Pb zircon geochronology on granitic rocks from the Guadalcazar to constrain the petrogenesis and tectonic environment. LA-ICP-SF-MS zircon U-Pb dating shows that the Guadalcazar granite was emplaced ca. 31 Ma. These rocks are characterized by high (SiO 2 ) contents (64-75 wt%), low CaO (0.28-1.78 wt%), with relatively high (FeO t ) adj /(FeO t + MgO) values ranging from 0.90 to 0.98. The geochemical diagrams of SiO 2 vs [(FeO t )/(FeO t + MgO)] and SiO 2 vs [(Na 2 O + K 2 O) − CaO] show the ferroan and mostly alkali-calcic nature of these rocks. The granite shows an A 2 -type affinity and is strongly peraluminous, with ASI (molar Al 2 O 3 /[CaO + Na 2 O + K 2 O]) values of 1.13 to 2.60. These granitic rocks are characterized by enrichments in rare earth elements (REE) and high field strength elements (HFSE), and depletion in Ba, Nb, Sr, Ti, and Eu. These features suggest that these A-type granites were derived from the metasedimentary rocks and evolved through extensive fractional crystallization. The multidimensional discrimination diagrams showed a continental rift or within-plate setting. By combining previous and new data, we proposed a new magmatic evolution model that supports an extension during ca. 34-28 Ma in the Guadalcazar, central Mexico.

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Section: Classification Origin and Magma Sourcementioning

confidence: 99%

Petrogenesis and geodynamic implications of Oligocene A-type granite in the Guadalcazar area, San Luis Potosi, central Mexico

et al. 2022

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“…This may be owing to the alteration of the alkaline feldspar and K-rich feldspar in the samples, which affected their Na, K and Al H Li et al element contents. The co-occurrence of such A-type granites, ranging from alkaline to aluminous, also occurs in SW China and northern Argentina, and their formation was related to crust-mantle interaction and sediment melting (Shellnutt & Zhou, 2007;Morales et al 2017).…”

Section: B Geochemical Datamentioning

confidence: 99%

Slab break-off origin of 105 Ma A-type porphyritic granites in the Asa area of Tibet

Wang

Zeng

et al. 2020

Geol. Mag.

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The study of the petrogenesis of some magmatic rocks with special geochemical attributes provides effective information for us to explore the deep geodynamic background of their formation. A series of granitic porphyry dykes have been found in the mélange zone of the Asa region in southern Tibet, whose genesis may be closely related to the evolution of the Meso-Tethyan Ocean. Regional geodynamic evolution is investigated by whole-rock geochemical analysis, zircon U–Pb dating and Lu–Hf isotopic analysis of two porphyritic granites. The Asa porphyritic granites have high SiO2 (74.29–78.65 wt %) and alkalis (Na2O + K2O = 6.51–9.35 wt %) contents, and low Al2O3 (11.60–14.51 wt %), CaO (0.04–0.19 wt MgO (0.01–0.10 wt %) contents. They are enriched in Zr, Nb, Ce, Y and Hf and depleted in Ti, Ba, Sr and P, consistent with A-type granites. The samples are relatively rich in LREEs, with LREE/HREE ratios of 1.73–3.04. They display negative Eu anomalies (Eu/Eu* = 0.24–0.28) and obvious Ce anomalies in some samples. Zircon U–Pb analyses show that the porphyritic granites formed in late Early Cretaceous time, 107.4 to 105.5 Ma. Zircon εHf(t) values are in the range of 6.9 to 12.0. These data indicate that the porphyritic granites were sourced from interaction between mantle-derived and juvenile lower crust-derived melts, with the addition of oceanic sediment-derived melts. This occurred when the subducting Bangong–Nujiang oceanic crust split to create a slab window. Rising asthenosphere triggered re-melting of lower crust basalts, resulting in the formation of the late Early Cretaceous A-type granites around Asa.

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Petrological, geochemical, isotopic, and geochronological constraints for the Late Devonian–Early Carboniferous magmatism in SW Gondwana (27–32°LS): an example of geodynamic switching

Dahlquist

Alasino

Basei

et al. 2018

Int J Earth Sci (Geol Rundsch)

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F-rich strongly peraluminous A-type magmatism in the pre-Andean foreland Sierras Pampeanas, Argentina: Geochemical, geochronological, isotopic constraints and petrogenesis

Cited by 26 publications

References 85 publications

Petrogenesis and geodynamic implications of Oligocene A-type granite in the Guadalcazar area, San Luis Potosi, central Mexico

Petrogenesis and geodynamic implications of Oligocene A-type granite in the Guadalcazar area, San Luis Potosi, central Mexico

Slab break-off origin of 105 Ma A-type porphyritic granites in the Asa area of Tibet

Petrological, geochemical, isotopic, and geochronological constraints for the Late Devonian–Early Carboniferous magmatism in SW Gondwana (27–32°LS): an example of geodynamic switching

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