Articles | Volume 16, issue 2
https://doi.org/10.5194/se-16-179-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-16-179-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
26 Feb 2025
Research article |
| 26 Feb 2025
| 26 Feb 2025
Petrogenesis of early Paleozoic I-type granitoids in the Longshoushan and implications for the tectonic affinity and evolution of the southwestern Alxa Block
Renyu Zeng
CORRESPONDING AUTHOR
School of Earth Sciences, East China University of Technology, Nanchang, 330013, China
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China
Department of Earth Sciences, Durham University, Durham DH1 3LE, UK
Hui Su
School of Earth Sciences, East China University of Technology, Nanchang, 330013, China
Mark B. Allen
Department of Earth Sciences, Durham University, Durham DH1 3LE, UK
Haiyan Shi
Qinghai Geological Survey, Technology Innovation Center for Exploration and Exploitation of Strategic Mineral Resources in Plateau Desert Region, Ministry of Natural Resources, Xining 810000, China
Houfa Du
School of Earth Sciences, East China University of Technology, Nanchang, 330013, China
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China
Chenguang Zhang
School of Geographic Sciences, Xinyang Normal University, Xinyang, 464000, China
Jie Yan
School of Earth Sciences, East China University of Technology, Nanchang, 330013, China
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China
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In the Liaodong Peninsula, the widely exposed Jurassic high-Sr / Y rocks are generally considered to be derived from the thickened mafic crust. However, research on the Zhoujiapuzi granite in this study shows that there is at least one pluton with a high Sr / Y signature inherited from the source. Zircon growth in Zhoujiapuzi granite can be divided into two stages. The light-CL core was formed in a deeper, hotter magma chamber. The dark-CL rim formed from later, more evolved magma.
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The Shanxi Rift is a young, active rift in northern China that formed atop a Proterozoic orogen. The impact of these structures on active rift faults is poorly understood. Here, we quantify the landscape response to active faulting and compare it with published maps of inherited structures. We find that inherited structures played an important role in the segmentation of the Shanxi Rift and in the development of rift interaction zones, which are the most active regions in the Shanxi Rift.
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In the Liaodong Peninsula, the widely exposed Jurassic high-Sr / Y rocks are generally considered to be derived from the thickened mafic crust. However, research on the Zhoujiapuzi granite in this study shows that there is at least one pluton with a high Sr / Y signature inherited from the source. Zircon growth in Zhoujiapuzi granite can be divided into two stages. The light-CL core was formed in a deeper, hotter magma chamber. The dark-CL rim formed from later, more evolved magma.
Related subject area
Subject area: Crustal structure and composition | Editorial team: Geochemistry, mineralogy, petrology, and volcanology | Discipline: Petrography
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This study highlights the tectono-metamorphic evolution of the lower crust in central Morocco from the Hercynian to the Quaternary from the study of granulitic xenoliths. After a first tectono-metamorphic event, the lower crust recorded heating associated with a moderate deformation preserved in sillimanite. Later, the lower crust interacted with basanite that brought the xenoliths up to the surface. This allows us to compare the evolution of the lower crust in the Rif and the Middle Atlas.
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Short summary
Debate has long surrounded the tectonic affinity and evolution of Longshoushan during the Paleozoic. This study presents new zircon U–Pb ages, whole-rock major and trace element data, and Hf isotopic analyses for granitoids. (1) Longshoushan was influenced by the North Qilian Orogenic Belt in the early Paleozoic, (2) it transitioned from a post-collisional compressional to an extensional setting ~435 Ma, and (3) a three-stage early Paleozoic tectonic model is proposed.
Debate has long surrounded the tectonic affinity and evolution of Longshoushan during the...
