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- Title
粤北长江地区花岗斑岩脉年代学、地球化学 特征及其地质意义.
- Authors
庞雅庆; 孟晓庆; 范洪海; 高飞; 王勇剑; 何德宝
- Abstract
The EW trending granite porphyry dyke mainly distributed in the central east of Changjiang uranium ore field of northern Guangdong province. With zircon U-Pb geochronological, petrological and geochemical research, the paper discussed the age,genetic type, magma sources, tectonic settings of the granite porphyry and their relations to uranium mineralization. LA-ICP-MS dating of Zircon in the granite porphyry got a concordant age of 151.8± 0.7 Ma (MSWD=1.8), which means that the granite porphyry was the product of early Yanshanian magmatism. Geochemical characteristics indicated that granite porphyry was high in the contents of SiO2 (average 74.67 %),Al2O3(average 13.39 %),and high ratios of K2O/Na2O (average 2.15), A/CNK (average 1.28) .The granite porphyry was found enriched in Rb, Th and Hf,but depleted in Ba,Sr,P and Ti,with high ratios of Rb/Sr (average 9.93) and Rb/ Nb (average 20.03) .The REE patterns are characterized by slight enrichment of light REE and right-inclining type, as well as obvious Eu depletion (average δEu of 0.31) .These features indicate that the granite porphyry is a typical crustal derived type granite. Comprehensive results show the granite porphyry dyke from Changjiang area formed by partial melting of argillaceous rock in the middle-upper crust sources under the post-orogenic extensional environment during the transition from compressional orogeny to non-orogeny. The presence of the granite porphyry has increased the inhomogeneity of the pluton, which maybe provided a beneficial. mineralization space for the uranium mineralization.
- Subjects
GUANGDONG Sheng (China); PORPHYRY; URANIUM ores; GRANITE; URANIUM; MAGMAS; LASER ablation inductively coupled plasma mass spectrometry; METALLOGENY; DIKES (Geology)
- Publication
World Nuclear Geoscience, 2023, Vol 40, Issue 3, p701
- ISSN
1672-0636
- Publication type
Article
- DOI
10.3969/j.issn.1672-0636.2023.03.002