Comparison of Granites from the Eastern and Western Districts of the Gejiu Ore District in South China: Implication for Petrogenesis and Tin Metallogeny
Late Cretaceous granitoids are developed in the eastern and western districts of the Gejiu ore district, but tin deposits mainly occur in the eastern district, and the reasons for the difference in mineralization between the eastern and western districts are still controversial. Considering the main...
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MDPI AG
2023-05-01
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| Series: | Minerals |
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| author | Saijun Sun Junjie Zhang Shuang Li Haobin Niu Zhaojian Wu Weidong Sun |
| author_facet | Saijun Sun Junjie Zhang Shuang Li Haobin Niu Zhaojian Wu Weidong Sun |
| author_sort | Saijun Sun |
| collection | DOAJ |
| description | Late Cretaceous granitoids are developed in the eastern and western districts of the Gejiu ore district, but tin deposits mainly occur in the eastern district, and the reasons for the difference in mineralization between the eastern and western districts are still controversial. Considering the main factors controlling granite Sn fertility, the whole-rock geochemical characteristics of granites on both sides are compared. LA-ICP-MS zircon U-Pb analyses of the Gejiu granites yielded two age periods: the early phase from 79.2 to 83.3 Ma and the later phase from 73.8 to 75.6 Ma. The western district granites have higher zircon ε<sub>Hf</sub>(<i>t</i>), CaO/Na<sub>2</sub>O, Ba, and Sr concentrations and lower Rb/Sr ratios than the eastern district granites, indicating that the western district granites have more mantle-derived materials in the source than the eastern district granites. Results of oxygen fugacity show that the western granites have a higher oxygen fugacity condition. More depleted Ba, Sr, P, Eu and Ti characteristics with obviously negative Eu anomalies in the eastern granites also have high Rb/Sr ratios and low Nb/Ta and Zr/Hf ratios, indicating that the eastern granites experienced highly magmatic differentiation, attributed to high volatile F contents that can reduce the viscosity and solidus of magma. Combined with the differences in field observations and structural styles, on the whole, the western district granites have higher oxygen fugacities and lower F contents and magmatic differentiation than those in the eastern district granites, indicating that the western district granites are not conducive to mineralization. |
| first_indexed | 2024-03-11T03:27:46Z |
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| id | doaj.art-d2cf343538bb4f268d2a192861919d6b |
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| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-11T03:27:46Z |
| publishDate | 2023-05-01 |
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| series | Minerals |
| spelling | doaj.art-d2cf343538bb4f268d2a192861919d6b2023-11-18T02:37:11ZengMDPI AGMinerals2075-163X2023-05-0113569110.3390/min13050691Comparison of Granites from the Eastern and Western Districts of the Gejiu Ore District in South China: Implication for Petrogenesis and Tin MetallogenySaijun Sun0Junjie Zhang1Shuang Li2Haobin Niu3Zhaojian Wu4Weidong Sun5Center of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, ChinaCenter of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, ChinaGuangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, College of Earth Science, Guilin University of Technology, Guilin 541004, ChinaChengdu Center, China Geological Survey, Chengdu 610081, ChinaSpecial Technology Exploration Center of China National Administration of Coal Geology, China Coal Geology Group Corporation Limited, Beijing 100040, ChinaCenter of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, ChinaLate Cretaceous granitoids are developed in the eastern and western districts of the Gejiu ore district, but tin deposits mainly occur in the eastern district, and the reasons for the difference in mineralization between the eastern and western districts are still controversial. Considering the main factors controlling granite Sn fertility, the whole-rock geochemical characteristics of granites on both sides are compared. LA-ICP-MS zircon U-Pb analyses of the Gejiu granites yielded two age periods: the early phase from 79.2 to 83.3 Ma and the later phase from 73.8 to 75.6 Ma. The western district granites have higher zircon ε<sub>Hf</sub>(<i>t</i>), CaO/Na<sub>2</sub>O, Ba, and Sr concentrations and lower Rb/Sr ratios than the eastern district granites, indicating that the western district granites have more mantle-derived materials in the source than the eastern district granites. Results of oxygen fugacity show that the western granites have a higher oxygen fugacity condition. More depleted Ba, Sr, P, Eu and Ti characteristics with obviously negative Eu anomalies in the eastern granites also have high Rb/Sr ratios and low Nb/Ta and Zr/Hf ratios, indicating that the eastern granites experienced highly magmatic differentiation, attributed to high volatile F contents that can reduce the viscosity and solidus of magma. Combined with the differences in field observations and structural styles, on the whole, the western district granites have higher oxygen fugacities and lower F contents and magmatic differentiation than those in the eastern district granites, indicating that the western district granites are not conducive to mineralization.https://www.mdpi.com/2075-163X/13/5/691Late Cretaceous granitemagma sourcemelting conditionbiotiteGejiu tin ore |
| spellingShingle | Saijun Sun Junjie Zhang Shuang Li Haobin Niu Zhaojian Wu Weidong Sun Comparison of Granites from the Eastern and Western Districts of the Gejiu Ore District in South China: Implication for Petrogenesis and Tin Metallogeny Minerals Late Cretaceous granite magma source melting condition biotite Gejiu tin ore |
| title | Comparison of Granites from the Eastern and Western Districts of the Gejiu Ore District in South China: Implication for Petrogenesis and Tin Metallogeny |
| title_full | Comparison of Granites from the Eastern and Western Districts of the Gejiu Ore District in South China: Implication for Petrogenesis and Tin Metallogeny |
| title_fullStr | Comparison of Granites from the Eastern and Western Districts of the Gejiu Ore District in South China: Implication for Petrogenesis and Tin Metallogeny |
| title_full_unstemmed | Comparison of Granites from the Eastern and Western Districts of the Gejiu Ore District in South China: Implication for Petrogenesis and Tin Metallogeny |
| title_short | Comparison of Granites from the Eastern and Western Districts of the Gejiu Ore District in South China: Implication for Petrogenesis and Tin Metallogeny |
| title_sort | comparison of granites from the eastern and western districts of the gejiu ore district in south china implication for petrogenesis and tin metallogeny |
| topic | Late Cretaceous granite magma source melting condition biotite Gejiu tin ore |
| url | https://www.mdpi.com/2075-163X/13/5/691 |
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