Zircon U–Pb ages, geochemistry, Sr–Nd–Hf isotopic compositions, and geological implications of the Shaziling pluton in the Nanling Orogenic Belt, southern China,Geological Journal

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Zircon U–Pb ages, geochemistry, Sr–Nd–Hf isotopic compositions, and geological implications of the Shaziling pluton in the Nanling Orogenic Belt, southern China
Geological Journal ( IF 1.4 ) Pub Date : 2020-04-15 , DOI: 10.1002/gj.3841
Jianfeng Li _{1,

2} , Haiqin Sheng ₁ , Shuaiyi You ₁

Affiliation

Laser ablation–inductively coupled plasma–mass spectrometry zircon U–Pb ages indicate that the Shaziling pluton in the Jiuyishan area, Ningyuan County, Hunan Province crystallised at 151.9 ± 1.1 to 154.1 ± 1.2 Ma, indicating that it was emplaced during the Late Jurassic. The Shaziling pluton is metaluminous to peraluminous (A/CNK = 0.93–1.09), and has high silica and alkali contents, low Ca and Mg contents, and K₂O/Na₂O and FeO*/MgO ratios of 1.37–2.65 (mean = 1.80) and 5.43–15.33 (mean = 7.14), respectively. The total rare earth element (REE) content varies from 186.75 to 413.17 ppm, and the pluton is enriched in light REEs and shows negative Eu anomalies (0.095–0.224). It is enriched in the large‐ion lithophile elements Rb and Th, and depleted in Ni, Cr, Eu, Ti, V, P, and Sr. The pluton yields Ga/Al ratios of 245–582 ppm (mean = 350 ppm) and Zr + Nb + Ce + Y contents of 256.8–630.7 ppm (mean = 441.95 ppm), similar to A‐type granites. The Shaziling pluton has a high initial ⁸⁷Sr/⁸⁶Sr ratio (Sr_i = 0.71603–0.71817), and low ε_Nd(t) (−6.8 to −7.4) and ε_Hf(t) (4.8 to −14.2) values. The granitic magmas were produced by partial melting of crustal material, along with a mantle contribution. The Nd and Hf model ages are 1546–1498 and 1756–1061 Ma, respectively, suggesting that the source rocks separated from the mantle reservoir during the Mesoproterozoic. The Shaziling pluton was formed in an intracontinental extensional environment related to subduction.

更新日期：2020-04-15

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