蚌埠隆起区古元古代钾长花岗岩的成因: 岩石地球化学、锆石U-Pb年代学与Hf同位素的制约

杨德彬; 许文良; 裴福萍; 王清海

Volume 34 Issue 1

Jan. 2009

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Article Navigation > Earth Science > 2009 > 34(1): 148-164

YANG De-bin, XU Wen-liang, PEI Fu-ping, WANG Qing-hai, 2009. Petrogenesis of the Paleoproterozoic K-Feldspar Granites in Bengbu Uplift: Constraints from Petro-Geochemistry, Zircon U-Pb Dating and Hf Isotope. Earth Science, 34(1): 148-164.

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Petrogenesis of the Paleoproterozoic K-Feldspar Granites in Bengbu Uplift: Constraints from Petro-Geochemistry, Zircon U-Pb Dating and Hf Isotope

1.
College of Earth Sciences, Jilin University, Changchun 130061, China
2.
International Centre for Geoscience Research and Education in Northeast Asia, Jilin University, Changchun 130026, China

Received Date: 2008-10-10
Publish Date: 2009-01-25

Abstract

Abstract

The study on the chronology, geochemistry and zircon Hf isotopes of the Zhuangzili and Mopanshan K-feldspar granites in Bengbu uplift was carried out in order to constrain their petrogenesis.Zircons from the intrusions display oscillatory zoning and high Th/U ratios (0.13-1.47), implying their magmatic origin.Zircon LA-ICP-MS, U-Pb dating results of the Zhuangzili and Mopanshan K-feldspar granites indicate that they formed in Paleoproterozoic with the upper intercept ages of 2104±20Ma and 2196±190Ma, respectively.Their SiO₂ and K₂O contents range from 69.65 to 77.95% and 4.98 to 5.17%, respectively.Moreover, the K-feldspar granites are enriched with light rare earth elements as well as Zr, Hf, Rb, Th, and U, while markedly depleted in Ba, Sr, Eu, P and Ti.Their ε_Nd(t) values vary from-3.4 to +3.2 and Nd model ages range from 2.31 to 2.79Ga.Their initial Hf isotope ratios and Hf two-stage model ages range from-5.1 to +7.8 and 2.26 to 2.83Ga, respectively.Taken together, it is suggested that the primary magma for the K-feldspar granites could be mainly derived from partial melting of the Paleoproterzoic and Neoarchean juvenile crust and that a small amount of ancient crustal material was involved in their origin.Chemically, these K-feldspar granites are A-type ones, implying that they formed under an extensional tectonic setting.
- Paleoproterozoic,
- K-feldspar granite,
- geochronology,
- geochemistry,
- Hf isotope,
- Bengbu uplift

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Petrogenesis of the Paleoproterozoic K-Feldspar Granites in Bengbu Uplift: Constraints from Petro-Geochemistry, Zircon U-Pb Dating and Hf Isotope

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