Volcano-sedimentary evolution of the Walvis Ridge (IODP Expedition 391)

鲸湾海岭的火山沉​​积演化（IODP 391 号探险队）

• 批准号: NE/W009862/1
• 负责人: David Buchs
• 金额: $ 3.3万
• 依托单位: CARDIFF UNIVERSITY
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FW009862%2F1
• 关键词: Volcano; sedimentary; evolution; Walvis; Ridge

IODP Expedition 391 along the Walvis Ridge (WR) will provide a unique opportunity to reconstruct the geological evolution of several submarine volcanic edifices considered to have formed due to hotspot volcanism on a slow-moving ocean plate. Previous drilling of the WR during DSDP Legs 39, 40, 74 and 75 recovered a large diversity of volcaniclastic deposits that suggest recurring formation of volcanic islands since the Late Cretaceous. However, our understanding of their formation and evolution remains hampered by very limited drilling. Similarly, the long-term geological (constructional and erosional) evolution of drown hotspot islands globally is still poorly understood due to difficulties to access and characterise their summit geology; consequently, existing models of oceanic island formation are based on observations from a limited selection of subaerial volcanic edifices that are much younger and/or unusually large compared to the vast population of unstudied seamounts thought to represent ancient oceanic islands. The proposed research will help address this observational bias through a lithofacies and geochemical characterisation of volcano-sedimentary sequences to be retrieved during Expedition 391 from the top of WR guyots. This will allow to test whether the evolution of the Ridge was accompanied by the formation of ephemeral oceanic islands, and whether the evolution of these possible islands was similar to that of other modern and ancient hotspot intraplate volcanoes in the Atlantic and Pacific Oceans. Ultimately, this will help develop an improved model of formation and evolution of large intraplate oceanic volcanoes.

沿着沃尔维斯山脊（WR）的IODP 391探险队将提供一个独特的机会来重建几个海底火山大厦的地质演化，这些海底火山大厦被认为是由于缓慢移动的海洋板块上的热点火山活动而形成的。先前在DSDP第39、40、74和75段期间对WR的钻探发现了大量的火山碎屑沉积物，这些沉积物表明晚白垩纪以来火山岛的反复形成。然而，由于钻井数量有限，我们对它们的形成和演化的理解仍然受到阻碍。同样，全球淹没热点岛的长期地质（构造和侵蚀）演变仍然知之甚少，因为很难进入和表征它们的顶峰地质；因此，现有的海洋岛屿形成模型是基于对有限选择的陆上火山大厦的观察，这些火山大厦比被认为代表古代海洋岛屿的大量未经研究的海山要年轻得多和/或异常大。该研究计划将通过391探险队从WR古丘顶部获取的火山-沉积序列的岩相和地球化学特征，帮助解决这一观测偏差。这将有助于测试洋脊的演化是否伴随着短暂的海洋岛屿的形成，以及这些可能的岛屿的演化是否与大西洋和太平洋上其他现代和古代的板内热点火山的演化相似。最终，这将有助于开发一个改进的大型板内海洋火山形成和演化的模型。

项目成果

Preliminary Characterization of Submarine Basalt Magnetic Mineralogy Using Amplitude‐Dependence of Magnetic Susceptibility

利用振幅对磁化率的依赖性对海底玄武岩磁性矿物学进行初步表征

• DOI: 10.1029/2023gc011222
• 发表时间: 2024
• 期刊: Geosystems
• 作者: Yang, H.;Tikoo, S. M.;Carvallo, C.;Bilardello, D.;Solheid, P.;Gaastra, K. M.;Sager, W. W.;Thoram, S.;Hoernle, K.;Höfig, T. W.
• 通讯作者: Höfig, T. W.

Nature and Origin of Magnetic Lineations Within Valdivia Bank: Ocean Plateau Formation by Complex Seafloor Spreading

• DOI: 10.1029/2023gl103415
• 发表时间: 2023-07
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: S. Thoram;W. W. Sager-W.;K. Gaastra;S. Tikoo;C. Carvallo;A. Avery;A. V. Del Gaudio;Y. Huang;K. Hoernle;T. W. Höfig;R. Bhutani;D. M. Buchs;C. Class;Y. Dai;G. Dalla Valle;S. Fielding;S. Han;D. Heaton;S. Homrighausen;Y. Kubota;C.-F. Li;W. R. Nelson;E. Petrou;K. E. Potter;S. Pujatti;J. Scholpp;J. Shervais;M. Tshiningayamwe;X. J. Wang;M. Widdowson

Expedition 391 Preliminary Report: Walvis Ridge Hotspot

• DOI: 10.14379/iodp.pr.391.2022
• 发表时间: 2022-05
• 期刊: International Ocean Discovery Program Preliminary Report
• 作者: W. Sager;K. Hoernle;T. Höfig;A. Avery;R. Bhutani;D. M. Buchs;C. A. Carvallo;C. Class;Y. Dai;G. Dalla Valle;A. V. Del Gaudio;K. Gaastra;S. Han;D. Heaton;S. Homrighausen;Y. Kubota;C. F. Li;W. R. Nelson;E. Petrou;K. E. Potter;S. Pujatti;J. Scholpp;M. Pincus;S. Fielding;J. Shervais;S. Thoram;S. M. Tikoo-Schantz;X. J. Wang;M. Widdowson;M. Tshiningayamwe;Scientists the Expedition

Walvis Ridge Hotspot

沃尔维斯岭热点

• DOI: 10.14379/iodp.proc.391.101.2023
• 发表时间: 2023
• 作者: Sager W