Speculations on the Paleozoic legacy of Gondwana amalgamation
文献类型：期刊论文
| 作者 | Murphy, Brendan1; Nance, R. Damian11,12,13; Johnston, Stephen T.1,2; Casas, Josep M.1,3; Cawood, Peter A.4; Matheson, Edward J.5; Pufahl, Peir K.6; Dan, Wei7 ; Alvaro, J. Javier8; Heron, Philip J.9
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| 刊名 | GONDWANA RESEARCH
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| 出版日期 | 2024-05-01 |
| 卷号 | 129页码:107-131 |
| 关键词 | Mantle plumes along Gondwana periphery Arc-plume interaction Ironstone deposits Super-mature clastic deposits Gondwana assembly and mantle convection |
| ISSN号 | 1342-937X |
| DOI | 10.1016/j.gr.2023.12.002 |
| 英文摘要 | Using Gondwana as an example, we show how the geological record can be interrogated to detect significant changes in mantle convection patterns at critical junctures in Earth's evolution. Evidence of major changes in mantle circulation in the aftermath of late Neoproterozoic-early Paleozoic Gondwana assembly is provided by widespread (i) plume-related magmatism around Gondwana's periphery, (ii) ironstone deposits related to mantle plume-ocean ridge interaction and enhanced hydrothermal activity, and (iii) super-mature clastic deposits that reflect epeirogenic uplift triggered by mantle upwelling beneath Gondwana combined with deep tropical weathering. In our model, Gondwana assembled above a region of mantle downwelling in which subducted slabs between the converging Gondwanan continents descended to the core-mantle boundary. Renewed subduction along Gondwana's periphery yielded early arc magmas. But as downwelling beneath Gondwana evolved into upwelling as a result of the ponding of subducted slabs at the base of the mantle, mantle plumes rose from the margins of the nascent upwelling to interact with the edges of Gondwana, where they penetrated the peripheral subduction zones via slab windows, tears and transform faults to generate voluminous calc-alkalic crustal melts in hydrated arc regions and A-type magmas in dry back-arc regions. The plumes also underplated oceanic lithosphere and interacted with adjacent ocean ridges, thereby enhancing hydrothermal activity and the flux of bioessential nutrients, leading to the recurrence of marine iron-rich sedimentary rocks in the geological record. At the same time, upwelling beneath a tropical to equatorial Gondwana led to epeirogenic uplift, deep weathering and erosion, resulting in the production of widespread super-mature clastic deposits. We contend that major changes in mantle convection patterns were encoded into the geological record of Gondwana assembly, influenced global-scale mantle convection patterns, and should be incorporated into geodynamic models for the assembly of Pangea. (c) 2023 Published by Elsevier B.V. on behalf of International Association for Gondwana Research. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001166097800001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77367]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Murphy, Brendan |
| 作者单位 | 1.St Francis Xavier Univ, Dept Earth & Environm Sci, Antigonish, NS B2G 2W5, Canada 2.Univ Alberta, Dept Earth & Planetary Sci, Edmonton, AB T6G 2E1, Canada 3.Univ Barcelona, Dept Dinam Terra & Ocean, Marti Franques S-N, Barcelona 08028, Spain 4.Monash Univ, Sch Earth Atmosphere & Environm, Clayton, Vic 3800, Australia 5.Cape Breton Univ, Dept Math Phys & Geol, Sydney, NS B1M 1A2, Canada 6.Queens Univ, Dept Geol Sci & Geol Engn, Kingston, ON K7L 3N6, Canada 7.Chinese Acad Sci, State Key Lab Isotope Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 8.UCM, Inst Geociencias, CSIC, Dr Severo Ochoa 7, Madrid 28040, Spain 9.Univ Toronto, Dept Earth Sci, Toronto, ON M5S 3B1, Canada 10.Univ Portsmouth, Sch Environm Geog & Geosci, Portsmouth PO1 3QL, England |
| 推荐引用方式 GB/T 7714 | Murphy, Brendan,Nance, R. Damian,Johnston, Stephen T.,et al. Speculations on the Paleozoic legacy of Gondwana amalgamation[J]. GONDWANA RESEARCH,2024,129:107-131. |
| APA | Murphy, Brendan.,Nance, R. Damian.,Johnston, Stephen T..,Casas, Josep M..,Cawood, Peter A..,...&Strachan, Rob A..(2024).Speculations on the Paleozoic legacy of Gondwana amalgamation.GONDWANA RESEARCH,129,107-131. |
| MLA | Murphy, Brendan,et al."Speculations on the Paleozoic legacy of Gondwana amalgamation".GONDWANA RESEARCH 129(2024):107-131. |
入库方式： OAI收割
来源：广州地球化学研究所
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