Geochronology and geochemistry of Early Cretaceous high-silica granites in the Nan'ao Island, South China: Petrogenesis and implications for lithospheric extension
文献类型：期刊论文
| 作者 | Zhou, Dawn; Sun, Peng; Jiang, Shijun; Liu, Xiao; Wang, Qiang |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2023 |
| 卷号 | 245页码:105558 |
| 关键词 | A-TYPE GRANITES CRUST-MANTLE INTERACTION GAN-HANG BELT U-PB AGE SOUTHEASTERN CHINA TECTONIC SIGNIFICANCE ISOTOPIC CONSTRAINTS VOLCANIC-ROCKS TRACE-ELEMENTS COASTAL AREA |
| ISSN号 | 1367-9120 |
| DOI | 10.1016/j.jseaes.2023.105558 |
| 英文摘要 | Widespread Late Mesozoic granites in South China are known to be younger southeastward, which is important for understanding the tectonic-magmatic evolution in South China. However, previous studies assumed Jurassic or Late Cretaceous ages for some granites in the Nan'ao Island, contradicting with the established trend. To address such controversy, we have carried out geochronological and geochemical studies of several granite plutons in this island. New zircon U-Pb age data show that they were emplaced in the Early Cretaceous from similar to 141 Ma in the Dajianshan area to 123-121 Ma in the Forest Park and Hulu-Guolaoshan areas, confirming that the southeastward younger trend of granitic magmatism had reached Nan'ao Island. These granites are characterized by high SiO2 (74.2-77.8 wt%) and low Al2O3 (12.0-13.1 wt%) contents, pronounced negative Ba-Eu-Sr-Ti anomalies, and moderately high temperatures of magmas (T-Zr = 655-771 degrees C; T-LREE = 675-819 degrees C). The Dajianshan granites have lower epsilon(Nd)(t) (-3.9 to -3.6), Nb/Ta (6.8-12), and Zr/Hf (16-22) than the Forest Park and Hulu-Guolaoshan granites (-1.5 to + 1.1, 9.4-16, and 20-30). The new data support the interpretation that the parental magmas for the Dajianshan granites were derived from a mixture of juvenile crustal rocks and Proterozoic metamorphic rocks whereas the parental magmas for the Forest Park and Hulu-Guolaoshan granites were sourced from juvenile crustal rocks. We envision that partial melting in the crust was induced by under -plating of mantle-derived mafic magma, which in turn was produced by decompression melting of ascending asthenospheric mantle in response to rollback of the subducting Paleo-Pacific plate. |
| WOS研究方向 | Geosciences, Multidisciplinary |
| 语种 | 英语 |
| WOS记录号 | WOS:000927306600001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/80388]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Zhou, Dawn,Sun, Peng,Jiang, Shijun,et al. Geochronology and geochemistry of Early Cretaceous high-silica granites in the Nan'ao Island, South China: Petrogenesis and implications for lithospheric extension[J]. JOURNAL OF ASIAN EARTH SCIENCES,2023,245:105558. |
| APA | Zhou, Dawn,Sun, Peng,Jiang, Shijun,Liu, Xiao,&Wang, Qiang.(2023).Geochronology and geochemistry of Early Cretaceous high-silica granites in the Nan'ao Island, South China: Petrogenesis and implications for lithospheric extension.JOURNAL OF ASIAN EARTH SCIENCES,245,105558. |
| MLA | Zhou, Dawn,et al."Geochronology and geochemistry of Early Cretaceous high-silica granites in the Nan'ao Island, South China: Petrogenesis and implications for lithospheric extension".JOURNAL OF ASIAN EARTH SCIENCES 245(2023):105558. |
入库方式： OAI收割
来源：广州地球化学研究所
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