Distinction between S-type and peraluminous I-type granites: Zircon versus whole-rock geochemistry

Gao, Peng; Zheng, Yong‐Fei; Zhao, Zi‐Fu

doi:10.1016/j.lithos.2016.04.019

Cited by 116 publications

(31 citation statements)

References 84 publications

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“…b) and had a SiO 2 content as high as 75.7%. These characteristics are typical of S‐type granites ( Chappell and White , , ; Gao et al., ; Mughal et al., ).…”

Section: Resultsmentioning

confidence: 82%

Rare earth element geochemistry during weathering of S‐type granites from dry to humid climates of Brazil

Silva

Nascimento

Biondi

et al. 2018

J. Plant Nutr. Soil Sci.

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S‐type granites are igneous rock types that are widespread in all continental crust. These granites play a key role in global weathering patterns and can be important economic ores of rare earth elements (REEs). This study provides insights into the geochemical and mineralogical signatures of REEs in S‐type granites and their derived soil profiles along a climosequence from dry to humid climates of Brazil. Mineralogical, petrographic, geochemical and soil analyses (physical and chemical) were used to evaluate the geochemistry of REEs in rock and soil samples. The granites were characterized as strongly peraluminous, being classified as typical S‐types. Both the granites and their derived soils contained high contents of REEs, with monazite and apatite being the major source of REEs. The high enrichment of light REEs (LRREs) in monazite and apatite explained the REE fractionation evidenced in the S‐type granites. The normalized REE distribution patterns for soil profiles along the climosequence revealed the fractionation between light and heavy REEs (HREEs). The ratio of La/YbN > 1 also confirmed the LREEs/HREEs fractionation. The mineralogical composition of the parent material and the clay minerals (kaolintes) seemed to govern the fractionation between LREEs and HREEs in these soils. Chemical index of alteration (CIA) values, REE fractionation and kaolinite proportions in soil profiles increased from dry to humid climates. These results suggest that the degree of weathering plays an important role in the type and volume of secondary minerals, as well as the REE fractionation. Among the phyllosilicates, kaolinite seems to be the most important adsorbent of light REE. The higher positive Eu anomalies with advanced weathering are explained by the breakdown of plagioclase. The weathering of monazite and apatite was the main reason for the slight negative Ce anomalies in the soil profiles. This study can be used to comprehend the geochemistry of REEs in other parts of the tropics underlain by S‐type granites.

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“…b) and had a SiO 2 content as high as 75.7%. These characteristics are typical of S‐type granites ( Chappell and White , , ; Gao et al., ; Mughal et al., ).…”

Section: Resultsmentioning

confidence: 82%

Rare earth element geochemistry during weathering of S‐type granites from dry to humid climates of Brazil

Silva

Nascimento

Biondi

et al. 2018

J. Plant Nutr. Soil Sci.

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“…The issue on the classification of the granitic rocks has been a hot topic for decades, and many types of granitic rocks are proposed based on the different standards, among which the classification of I-, S-, M-, and A-type granite are well accepted all over the world [41][42][43][44][45][46][47][48][49][50][51]. The term of A-type granite was first proposed by [45] and defined by their alkaline, anhydrous and anorogenic nature.…”

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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“…Peraluminous granites are usually S‐type granites and may also partly include highly fractionated I‐type granites (Wu, Liu, et al, ). They are characterized by high aluminium content, generally with A/CNK > 1.0, SiO 2 (68–77 wt.%), high K 2 O, Na 2 O and P 2 O 5 content, low CaO content, initial 87 Sr/ 86 Sr > 0.706, and εNd ( t ) < −2 (White & Chappell, ; Sylvester, ; Champion & Bultitude, ; Gao, Zheng, & Zhao, ). S‐type granites are usually the products of the partial melting of sedimentary rocks from the upper crust (White & Chappell, ; Gao et al, ).…”

Section: Discussionmentioning

confidence: 99%

Peraluminous granitoid magmatism from isotopically depleted sources: The case of Jing'erquanbei pluton in Eastern Tianshan, Northwest China

Muhtar

Santosh

et al. 2018

Geological Journal

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The Eastern Tianshan region is a critical segment of the Central Asian Orogenic Belt (CAOB), one of the largest Phanerozoic accretionary orogenic belts in the world. Several pulses of isotopically depleted Late Palaeozoic calc-alkaline and high-K calc-alkaline granitoid magmatism are known to be associated with the collisional orogeny in the CAOB. However, no systematic studies have been conducted on the peraluminous granites that were formed during the Late Palaeozoic collisional orogeny in EasternTianshan.Here, we present major and trace element characteristics, whole-rock Sr-Nd isotopes, and zircon U-Pb and Lu-Hf data from the Jing'erquanbei pluton in the eastern part of Eastern Tianshan. Zircon grains from the granite yield a weighted mean U-Pb age of 250 ± 4 Ma, which is consistent with the previously determined 40 Ar-39 Ar age of muscovite in the associated ore body, suggesting Late Permian magmatism. The pluton shows a wide range of Sr isotope ratios ( 87 Sr/ 86 Sr = 0.705777-1.308836) but depleted Nd (εNd (t) = +6.71 to +8.21) and Hf (εHf (t) = +12.6 to +14.6) isotopic values. The Nd and Hf isotopic values are also consistent with the Nd and Hf isotopic values of the Carboniferous mafic volcanics (εNd (t) = +5.50 to +9.66, εHf (t) = +6.3 to +13.2) in Eastern Tianshan. The whole-rock Nd model age (T DM2 = 350-480 Ma) and zircon Hf model age (T DM2 = 342-451 Ma) as well as the Carboniferous inherited zircon (341 ± 5 Ma) suggest that original magma was derived from young and depleted juvenile crust source. The granite is characterized by high SiO 2 (74.50%-75.80%), enriched alkali contents with high sodium values (K 2 O + Na 2 O = 5.65%-8.20%, Na 2 O/K 2 O = 1.24-2.74), concentration of peraluminous elements (Al 2 O 3 /(CaO + Na 2 O + K 2 O) [A/CNK] = 1.18-1.24), high large-ion lithophile element content, low Nb/Ta (9.97-10.64) ratio, variable Rb/Sr (0.18-16.11) ratios, and negative Eu anomalies (Eu/Eu * = 0.05-0.81). These features suggest that some minerals, such as biotite, plagioclase, and apatite, underwent fractional crystallization during the formation and evolution of the pluton. Considering the regional magmatic activity as well as tectonic evolution, we speculate that peraluminous granites of the Huangshan-Jing'erquan area of Eastern Tianshan were generated during the postcollisional extension in the Late Permian. Dehydration and melting of the Carboniferous mafic volcanics through heat input from mafic-ultramafic magma in the Middle Permian is considered to have generated the peraluminous granites.

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Distinction between S-type and peraluminous I-type granites: Zircon versus whole-rock geochemistry

Cited by 116 publications

References 84 publications

Rare earth element geochemistry during weathering of S‐type granites from dry to humid climates of Brazil

Rare earth element geochemistry during weathering of S‐type granites from dry to humid climates of Brazil

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

Peraluminous granitoid magmatism from isotopically depleted sources: The case of Jing'erquanbei pluton in Eastern Tianshan, Northwest China

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