The source of A-type magmas in two contrasting settings: U–Pb, Lu–Hf and Re–Os isotopic constraints

Pankhurst, Matthew J.; Schaefer, Bruce F.; Turner, Simon; Argles, Tom; Wade, Claire E.

doi:10.1016/j.chemgeo.2013.05.010

Cited by 52 publications

(25 citation statements)

References 82 publications

(46 reference statements)

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“…The term of A-type granite was first proposed by [45] and defined by their alkaline, anhydrous and anorogenic nature. Then, many geologists enriched and improved the concept of A-type granite, making it a significant component of the granite series [44,[52][53][54][55]. Generally, in terms of the elemental compositions, the A-type granites have high contents of SiO 2 , K 2 O, Na 2 O, Zr, Nb, REE, Y, and Ga, and low contents of CaO, Sr, Ba, and so forth, and characterized by high ratios of Ga/Al and (K 2 O + Na 2 O)/CaO [43].…”

Section: Genetic Type Of the Granitic Rocks: An A-type Affinitymentioning

confidence: 99%

Geochronology, Petrology, and Genesis of Two Granitic Plutons of the Xianghualing Ore Field in South Hunan Province: Constraints from Zircon U–Pb Dating, Geochemistry, and Lu–Hf Isotopic Compositions

Yang

Cao

et al. 2018

Minerals

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Two small-sized granitic plutons, outcropped in Xianghualing ore field, South Hunan (South China), have a close relationship with the super large-scale Sn-W polymetallic mineralization in this ore field. The Laiziling and Jianfengling plutons are composed of medium-to coarse-grained two-mica and coarse-grained biotite granites, respectively, and have zircon U-Pb ages of 156.4 ± 1.4 Ma and 165.2 ± 1.4 Ma, respectively. Both of the Laiziling and Jianfengling granites are characterized by extremely similar elemental and Lu-Hf isotopic compositions with high contents of SiO 2 , Al 2 O 3 , Na 2 O, K 2 O, high A/CNK ratios, negative ε Hf (t) values (ranging from −3.86 to −1.38 and from −5.44 to −3.71, respectively), and old T DMC ages (ranging from 1.30 to 1.47 Ga and from 1.32 to 1.56 Ga, respectively). These features indicate that they both belong to highly fractionated A-type granites, and were formed in an extensional setting and from the same magma chamber originated from the Paleoproterozoic metamorphic basement of South China with a certain amount of mantle-derived magma involved with temperatures of ca. 730 • C and low oxygen fugacity.

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Section: Genetic Type Of the Granitic Rocks: An A-type Affinitymentioning

confidence: 99%

Geochronology, Petrology, and Genesis of Two Granitic Plutons of the Xianghualing Ore Field in South Hunan Province: Constraints from Zircon U–Pb Dating, Geochemistry, and Lu–Hf Isotopic Compositions

Yang

Cao

et al. 2018

Minerals

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“…All the studied granites in the Guijiayu pluton have high K 2 O + Na 2 O (>7.50 wt.%) and Zr + Nb + Ce + Y (>577 ppm) contents, FeOt/(FeOt + MgO) (>0.93) and 10,000 Ga/Al (>2.94) ratios, consistent with typical A-type granite characterized by enrichments of K 2 O + Na 2 O contents and incompatible elements (e.g., Zr, Y, Nb and Ce, REEs barring Eu) and high FeOt/(FeOt + MgO) ratios (e.g., Loiselle and Wones, 1979;Whalen et al, 1987;Creaser et al, 1991;Bonin, 2007;Pankhurst et al, 2013;Frost, 1997, 2011;Frost et al, 2001). In addition, the following signatures of the Guijiayu granites are also compatible with that of A-type granite.…”

Section: Genetic Typementioning

confidence: 79%

“…For example, (1) all the samples have high alkali contents and large-ion lithophile elements (LILE) abundances (e.g., Rb, Th and U), low CaO, P 2 O 5 contents and are depleted in Eu, Sr, Ti and P (Fig. 7), resembling typical A-type granites (e.g., King et al, 1997;Li et al, 2007;Pankhurst et al, 2013); (2) the high initial melting temperatures (up to 900°C) as revealed by the zircon show a similar origin to A-type granites with high melting temperatures (e.g., Loiselle and Wones, 1979;King et al, 1997); (3) the low Al 2 O 3 /TiO 2 ratios (14-29) of the Guijiayu granites accord with that of A-type (Sylvester, 1998). Furthermore, in the classification plots of granite (Figs.…”

Section: Genetic Typementioning

confidence: 99%

“…A-type granites can originate from different source regions, including fractional crystallization of mantle-derived mafic magmas (Eby, 1992;Turner et al, 1992;Shellnutt and Zhou, 2007), partial melting of crustal source (Skjerlie and Johnston, 1992;Patiño Douce, 1997;Wu et al, 2002;Shellnutt and Zhou, 2007;Shellnutt et al, 2011), or mixing of the two end members Pankhurst et al, 2013).…”

Section: Petrogenesismentioning

confidence: 99%

“…They comprise a distinct group of granitoid rocks that are commonly produced in an extensional tectonic setting (e.g., Eby, 1992;Bonin, 2007), but their origins can be different and remains controversial (e.g., Skjerlie and Johnston, 1992;Turner et al, 1992;Patiño Douce, 1997;Wu et al, 2002;Yang et al, 2006;Shellnutt and Zhou, 2007;Shellnutt et al, 2011;Pankhurst et al, 2013). This type of rock is rare in Archean and early-mid Paleoproterozoic but has been identified extensively worldwide since the late Paleoproterozoic (e.g., Whalen et al, 1987;Anderson and Bender, 1989;Rämö et al, 1995;Dall'Agnol et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Geochronology and geochemistry of the late Paleoproterozoic aluminous A-type granite in the Xiaoqinling area along the southern margin of the North China Craton: Petrogenesis and tectonic implications

Deng

Peng

Zhao

2016

Precambrian Research

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Geochronology and geochemistry of granites from the Hengjian area, Qinling Orogenic Belt: Implications for the Late Palaeozoic tectonic evolution of the North Qinling Terrane, China

Han

Lin

et al. 2021

Geological Journal

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The North Qinling Orogen underwent subduction and collision processes during the Palaeozoic, but the tectonic framework remains unclear. To investigate the tectonic evolution of the North Qinling Orogen, we selected the Devonian granites from the northeastern margin of the North Qinling Terrane. Integrated petrographic, geochemical, and geochronological studies, as well as Sr-Nd-Hf isotopic analyses, were carried out on the newly identified Devonian granites from the Hengjian area in the northeastern North Qinling Terrane, Qinling Orogenic Belt. Zircon laser ablation inductively coupled plasma mass spectrometry U-Pb dating reveals that these granites were crystallized at 396-387 Ma. The granite samples are metaluminous to weakly peraluminous (A/CNK = Al 2 O 3 /(CaO+Na 2 O+K 2 O) = 0.86 to 1.12), with high SiO 2 (60.6-76.5 wt%) and high total alkaline (Na 2 O + K 2 O = 8.45-11.0 wt%) contents. The granites are enriched in Th, rare-earth element, Zr, and Hf and depleted in Sr, Nb, Ta, P, Eu, and Ti. They are characterized by high Zr + Nb + Ce + Y contents (511-990 ppm) and 10,000*Ga/Al ratios (2.71-3.32), as well as high zircon-saturation temperatures (T Zr = 819-885 C, average = 845 C), which indicate that they are typical A-type granites. The granites have low Y/Nb (0.39-0.67) and Yb/Ta (0.56-0.83) ratios, resembling those of the A 1 -type granite, which indicates that they are formed in anorogenic settings. They also have low ( 87 Sr/ 86 Sr) i ratios (0.7055-0.7071) and negative ε Nd (t) values (À10.1 to À8.40) and variable zircon ε Hf (t) values (À8.46 to +14.7), with the two-stage model ages of 2.0-1.8 Ga and 1.9-0.4 Ga, respectively. These geological features suggest that the granites of the Hengjian area were most likely generated by partial melting of mafic lower crust induced by asthenospheric ascent. The A-type granites were generated in a continental rift environment during 396-387 Ma, corresponding to the closure of the Shangdan Ocean and the opening of the Palaeo-Tethyan Ocean during the Early Devonian.

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The source of A-type magmas in two contrasting settings: U–Pb, Lu–Hf and Re–Os isotopic constraints

Cited by 52 publications

References 82 publications

Geochronology, Petrology, and Genesis of Two Granitic Plutons of the Xianghualing Ore Field in South Hunan Province: Constraints from Zircon U–Pb Dating, Geochemistry, and Lu–Hf Isotopic Compositions

Geochronology, Petrology, and Genesis of Two Granitic Plutons of the Xianghualing Ore Field in South Hunan Province: Constraints from Zircon U–Pb Dating, Geochemistry, and Lu–Hf Isotopic Compositions

Geochronology and geochemistry of the late Paleoproterozoic aluminous A-type granite in the Xiaoqinling area along the southern margin of the North China Craton: Petrogenesis and tectonic implications

Geochronology and geochemistry of granites from the Hengjian area, Qinling Orogenic Belt: Implications for the Late Palaeozoic tectonic evolution of the North Qinling Terrane, China

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