Developing continuous volcano-stratigraphies across the South Atlantic Transect: NERC UK-IODP Moratorium support for Aled Evans - IODP Expedition 393

开发横跨南大西洋横断面的连续火山地层：NERC UK-IODP 暂停支持 Aled Evans - IODP Expedition 393

• 批准号: NE/X00631X/1
• 负责人: Damon Teagle
• 金额: $ 6.97万
• 依托单位: University of Southampton
• 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: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FX00631X%2F1
• 关键词: Developing; continuous; volcano; stratigraphies; across

Mid-Ocean Ridges are the most extensive magmatic system on Earth, producing 75 per cent of the planet's volcanism with the resulting processes governing the architecture of at least two thirds of the surface of our planet. A representative stratigraphic record of the order, eruption style, and extent of mid-ocean ridge lava flows is required to understand seafloor spreading, a fundamental process in plate tectonics. As access to ocean crust is restricted to scientific ocean drilling and the use of submersibles, physical and chemical information on the nature of upper ocean crust is limited to recovered rock. However, during scientific ocean drilling, the proportion of recovered rock compared to the length drilled is both generally low and highly variable. These recovered samples have been shown to reflect a bias towards stronger, more competent lithologies, with weaker, more incompetent rock types underrepresented. This highlights that recovered physical samples from scientific expeditions display only a partial representation of reality. Integration of recovered physical drill cores with quantitative geophysical wireline logging data can provide representations of the volcanic stratigraphy at drilled sections of mid-ocean ridges. The unification of a physical but incomplete dataset, with a complete but abstract quantitative dataset, provides constraints on biases within recovered samples. An understanding of the bias reflected in recovered samples is essential to avoid inaccurate estimations of key planetary processes such as the extent of heat, chemical, and mass exchange between ocean crustal rocks and seawater. The understanding and quantification of these exchanges is necessary in evaluating the role of mid-ocean ridges on long-term global geochemical cycles (e.g., C, H2O) and the wider habitability of the planet. International Ocean Discovery Program (IODP) Expeditions 390 and 393 will drill a transect of six sites across the South Atlantic, recovering ocean crust formed at the Mid-Atlantic Ridge between 7 and 61 million years ago. I will integrate observations of physically recovered core samples with quantitative geophysical wireline logging data from these drillholes to reconstruct the volcanic history along a transect of the aging western flank of the southern Mid-Atlantic Ridge . The resulting stratigraphy will provide an essential foundation for subsequent investigations and quantifications of planetary processes at mid-ocean ridges.

海洋中部山脊是地球上最广泛的岩浆系统，产生了地球的75％的火山，由此产生的过程，统治着我们星球表面的三分之二的建筑。需要了解海底散布的订单，喷发风格和范围的代表性地层记录，这是板块构造的基本过程。由于进入海皮的通道仅限于科学海洋钻井和潜水物的使用，因此有关上海壳性质的物理和化学信息仅限于回收的岩石。但是，在科学海洋钻井过程中，与钻孔长度相比，回收岩石的比例通常是低和高度可变的。这些回收的样品已被证明反映了对更强大，更有能力的岩性的偏见，岩石类型较弱，岩石类型较弱。这突出显示了从科学探险中回收的物理样本仅显示现实的部分表示。将回收的物理钻芯与定量的地球物理有线记录数据的整合可以提供中腹脊的钻探区域的火山地层的表示。具有完整但抽象的定量数据集的物理但不完整数据集的统一为恢复样本中的偏差提供了限制。对回收样品反映的偏见的理解对于避免对关键行星过程的估计不准确，例如海洋地壳岩石和海水之间的热量，化学和质量交换的程度。对这些交流的理解和量化对于评估中山脊对长期全球地球化学周期（例如C，H2O）的作用以及地球的更广泛可居住性是必要的。国际海洋发现计划（IODP）探险队390和393将钻出整个南大西洋六个地点的样品，并在7到6100万年前在中大西洋山脊形成的海皮。我将将对物理回收的核心样品的观察与来自这些钻孔的定量地球物理记录数据结合在一起，以沿着南部中大西洋山脊的衰老西侧侧面的样带重建火山历史。由此产生的地层将为随后对中山脊的行星过程进行调查和量化为基础。

项目成果

South Atlantic Transect

南大西洋横断面

• 发表时间: 2024
• 期刊: Proceedings of the International Ocean Discovery Program Expedition reports
• 作者: Coggon, R.M.;Teagle, D.A.H.;Sylvan, J.B.;Reece, J.;Estes, E.R.;Williams, T.J.;Christeson, G.L.
• 通讯作者: Christeson, G.L.

Expedition 393 Preliminary Report: South Atlantic Transect 2

• DOI: 10.14379/iodp.pr.393.2023
• 发表时间: 2023-01
• 期刊: International Ocean Discovery Program Preliminary Report
• 作者: D. Teagle;J. Reece;R. Coggon;J. Sylvan;G. Christeson;T. Williams;E. Estes

Expedition 390 Preliminary Report: South Atlantic Transect 1

• DOI: 10.14379/iodp.pr.390.2022
• 发表时间: 2022-10
• 期刊: International Ocean Discovery Program Preliminary Report
• 作者: R. Coggon;J. Sylvan;D. Teagle;J. Reece;G. Christeson;E. Estes;T. Williams