江西相山铀矿田中西部鹅湖岭组与打鼓顶组碎斑流纹岩特征对比及其成因探讨

田明明; 李子颖; 聂江涛; 刘军港; 王健; 曹建辉

doi:10.3799/dqkx.2020.181

Volume 46 Issue 12

Dec. 2021

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Tian Mingming, Li Ziying, Nie Jiangtao, Liu Jungang, Wang Jian, Cao Jianhui, 2021. A Comparative Study and Its Genesis of Porphyroclastic Rhyolite from Ehuling and Daguding Formations in Midwestern of Xiangshan Uranium Orefield, Jiangxi Province. Earth Science, 46(12): 4546-4561. doi: 10.3799/dqkx.2020.181

Citation:

Tian Mingming, Li Ziying, Nie Jiangtao, Liu Jungang, Wang Jian, Cao Jianhui, 2021. A Comparative Study and Its Genesis of Porphyroclastic Rhyolite from Ehuling and Daguding Formations in Midwestern of Xiangshan Uranium Orefield, Jiangxi Province. Earth Science, 46(12): 4546-4561. doi: 10.3799/dqkx.2020.181

Citation:

Tian Mingming, Li Ziying, Nie Jiangtao, Liu Jungang, Wang Jian, Cao Jianhui, 2021. A Comparative Study and Its Genesis of Porphyroclastic Rhyolite from Ehuling and Daguding Formations in Midwestern of Xiangshan Uranium Orefield, Jiangxi Province. Earth Science, 46(12): 4546-4561. doi: 10.3799/dqkx.2020.181

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A Comparative Study and Its Genesis of Porphyroclastic Rhyolite from Ehuling and Daguding Formations in Midwestern of Xiangshan Uranium Orefield, Jiangxi Province

doi: 10.3799/dqkx.2020.181

Beijing Research Institute of Uranium Geology, Beijing 100029, China

Received Date: 2020-02-22
Publish Date: 2021-12-15

Abstract

Abstract

Porphyroclastic rhyolites of Ehuling and Daguding formations were taken as the research objects in this paper, which was sampled from the boreholes in the midwestern parts of Xiangshan uranium orefield. A comparative study of porphyroclastic rhyolite from these two formations were carried out by means of petromineralogy, lithogeochemistry, U-Pb geochronology and Hf isotopes. The results illustrate that the mineralogical composition and lithogeochemical characteristics of porphyroclastic rhyolite from Ehuling and Daguding formations are relatively semblable, the rock enriching Si and K₂O, low Na₂O and MgO. Chondrite normalized REE curves are generally consistent, showing right-inclined type with enriched LREE. The samples from the Ehuling Formation demonstrate more intensive Eu negative anormaly, indicating that a high degree of crystallizational fractionation of plagioclase was occured, or more plagioclase residued in source area. While the high fractional degree of LREE and HREE of Daguding porphyroclastic rhyolite is likely related to the high contents of secondary minerals, such as titanite, epidoite and monazite. Primitive mantle-normalized spider diagram shows depletion of lithophile elements (K, Ba, Sr) and high field strength elements (Nb, Ti, P), and enrichment of Rb, Th, Nd. These similar petrogeochemical characteristics suggest a certain homology between Ehuling and Daguding porphyroclastic rhyolite. Zircon U-Pb dating results indicate that the age of porphyroclastic rhyolite from Ehuling Formation and Daguding Formation are 132.4±0.7 Ma and 131.9±0.8 Ma respectively. The ε_Hf(t) of porphyroclastic rhyolite of Ehuling Formation is (-9.5)-(-4.5), and the two-stage Hf model age is 1 470-1 787 Ma; while the ε_Hf(t) of porphyroclastic rhyolite of Daguding Formation is (-14.2)-(-8.1), and the two-stage Hf model age is 1 704-2 087 Ma. The above petromineralogy, lithogeochemistry, zircon U-Pb age and Hf isotope characteristics show that the porphyroclastic rhyolite of Ehuling Formation and the Daguding Formation have certain similarities, but at the same time, some differences exist. Combined with previous research data, a conclusion can be drawn, the formation of two sets of porphyroclastic rhyolite maybe homologous, both of them are derived from the partial melting of Paleoproterozoic-Mesoproterozoic metamorphic rock basement under the background of Early Cretaceous regional extensional environment, and may be accompanied by the merging of mantle material in a certain degree.
- porphyroclastic rhyolite,
- lithogeochemistry,
- zircon U-Pb age,
- zircon Hf isotope,
- Xiangshan uranium orefield

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A Comparative Study and Its Genesis of Porphyroclastic Rhyolite from Ehuling and Daguding Formations in Midwestern of Xiangshan Uranium Orefield, Jiangxi Province

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