Paleozoic Episodic Magmatism in Western Tianshan: Insight Into Assembling the Northeastern Pangea
文献类型：期刊论文
| 作者 | Wang, Kai5; Cai, Keda5; Sun, Min1; Lai, Chun-Kit4; Xia, Xiao-Ping3; Wang, Xiangsong1; Bao, Zihe2 |
| 刊名 | GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
 |
| 出版日期 | 2024-07-01 |
| 卷号 | 25期号:7页码:19 |
| DOI | 10.1029/2023GC011329 |
| 英文摘要 | The late-stage union of Pangea was associated with the convergence of Siberia with Laurussia, but the exact timing remains unclear. The orogenic duration of the Kazakhstan block can provide geochronological constraints as it connects Siberia, Baltica, and Tarim. Zircon petrochronology offers a reliable approach for ascertaining the lifespan of an ancient orogen. In this study, we explore three phases of magmatism recorded in detrital zircons from late Paleozoic and Mesozoic sandstone-siltstones in Western Tianshan, that is, 400-470 Ma, 320-380 Ma, and 280-320 Ma. Based on their age-propagated Hf isotopes, melt SiO2 contents, and crustal thicknesses, our findings suggest that the southern limb of Kazakhstan underwent the early Paleozoic amalgamation of microcontinents with arcs, the late Paleozoic maturation of an Andean-like continental arc, and the late Carboniferous collision of Kazakhstan with the Junggar oceanic basin and the Tarim craton. Such characteristics manifest the long-term orogenic progression of Kazakhstan. Combining published timelines and paleolatitudes of major orogens and blocks, we propose that the Kazakhstan block welded northeastern Pangea along with the cessation of these orogenic activities around it. Consequently, by docking Kazakhstan with surrounding cratons, the fundamental configuration of Pangea could have been established in the late Carboniferous. Pangea was suggested to have assembled at ca. 250 Ma upon paleogeographic reconstructions. However, the assembling time remains a matter of debate due to low-quality Permo-Carboniferous paleomagnetic data on the northeast of Pangea; thus, other geochronological records need to be determined. Here, we employ the method of zircon petrochronology to trace the orogenic processes of Kazakhstan because it serves as a pivot in welding peripheral Siberia, Baltica, and Tarim blocks. Our results demonstrate that episodic variations in melt compositions, crustal thicknesses, and Hf isotopes reveal the long-lived orogenic progression of the southern limb of Kazakhstan and constrain its incorporation into Pangea to the late Carboniferous. Such an event was almost contemporaneous with the assembly of Baltica and Siberia with the northern limb of Kazakhstan but occurred slightly later than the collision of Laurussia with Gondwana. As such, the fundamental configuration of Pangea could have been established in the late Carboniferous rather than the Permian, as previous paleogeographic reconstructions postulated. Detrital zircons in Western Tianshan record three phases of Paleozoic magmatism Zircon petrochronology can trace orogenic processes of the southern limb of Kazakhstan Docking Kazakhstan with surrounding cratons in the late Carboniferous marked the major assembly of the northeastern Pangea |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001264009500001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/78294]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Cai, Keda |
| 作者单位 | 1.Univ Hong Kong, Dept Earth Sci, Hong Kong, Peoples R China 2.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Urumqi, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Peoples R China 4.Fortescue Met Grp Ltd, Global Project Generat & Targeting, East Perth, WA, Australia 5.China Univ Geosci, Frontiers Sci Ctr Deep time Digital Earth, Sch Earth Sci & Resources, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Kai,Cai, Keda,Sun, Min,et al. Paleozoic Episodic Magmatism in Western Tianshan: Insight Into Assembling the Northeastern Pangea[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2024,25(7):19. |
| APA | Wang, Kai.,Cai, Keda.,Sun, Min.,Lai, Chun-Kit.,Xia, Xiao-Ping.,...&Bao, Zihe.(2024).Paleozoic Episodic Magmatism in Western Tianshan: Insight Into Assembling the Northeastern Pangea.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,25(7),19. |
| MLA | Wang, Kai,et al."Paleozoic Episodic Magmatism in Western Tianshan: Insight Into Assembling the Northeastern Pangea".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 25.7(2024):19. |
入库方式： OAI收割
来源：广州地球化学研究所
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