Back to Search
Start Over
Geochronology and Petrogenesis of the Early Paleozoic Jilongjie Granites in the Central South China Block: Implication for Post-Kinematic Lithospheric Delamination.
- Source :
- Minerals (2075-163X); Jun2023, Vol. 13 Issue 6, p734, 23p
- Publication Year :
- 2023
-
Abstract
- Controversy over the geodynamic interpretation of the early Paleozoic granites in the South China Block constrains understanding of tectonic–magmatic evolution. In this paper, we present zircon U-Pb age, Hf isotope, and major and trace element data of the early Paleozoic granites in the Jilongjie region, south-central Hunan Province. A sample that yielded a weighted average <superscript>206</superscript>Pb/<superscript>238</superscript>U age of 425 ± 3 Ma falls into the post-collisional granite field in the classification discriminant of magmatic rocks. Geochemical features indicate that the Jilongjie pluton is a shoshonitic metaluminous rock. The Jilongjie pluton's chondrite-normalized rare earth element patterns exhibit a slight enrichment of light rare earth elements (LREEs) relative to heavy rare earth elements (HREEs) with (La/Yb)<subscript>N</subscript> ratios of 15.1–23.7 and weak Eu anomalies (Eu/Eu* = 0.68–0.78). Zircon Hf isotope results show ε<subscript>Hf</subscript>(t) ranging from −9.94 to −0.69. Jilongjie granite's parent magma originated from a mixing of crust-derived felsic and mantle-derived mafic magmas, which then underwent fractional crystallization during its ascent. Jilongjie granite was generated through a post-collisional extensional setting associated with delamination of the thickened lithosphere. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 2075163X
- Volume :
- 13
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Minerals (2075-163X)
- Publication Type :
- Academic Journal
- Accession number :
- 164685692
- Full Text :
- https://doi.org/10.3390/min13060734