NSFGEO-NERC: Sulfur Cycling at Subduction Zones

NSFGEO-NERC：俯冲带的硫循环

• 批准号: 1933773
• 负责人: Terry Plank
• 金额: $ 45.57万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1933773&HistoricalAwards=false
• 关键词: NSFGEO; NERC; Sulfur; Cycling; Subduction

This is a project that is jointly funded by the National Science Foundation's Directorate of Geosciences (NSF/GEO) and the National Environment Research Council (NERC) of the United Kingdom (UK) via the NSF/GEO-NERC Lead Agency Agreement. This Agreement allows a single joint US/UK proposal to be submitted and peer-reviewed by the Agency whose investigator has the largest proportion of the budget. Upon successful joint determination of an award, each Agency funds the proportion of the budget and the investigators associated with its own country.Sulfur is a critical element in Earth's environment. When volcanoes erupt, sulfur is ejected into the atmosphere with cooling effects. Sulfur is also the transport agent and host of economic metals such as lead and zinc. The cluster of factors that control how much sulfur is available to volcanoes and metal deposits is still a major question in science, one that this project seeks to answer. One possible source of sulfur includes the sediments on the seafloor, which are subducted into the Earth to the depths where magmas form. This project is testing this hypothesis by measuring for the first time the sulfur forms and fluxes that feed volcanic systems at different subduction zones. A team of scientists from the US (Columbia University), the UK (Oxford University) and Italy (University of Palermo) will partner with the Ocean Drilling Program at Texas A&M University and the NERC Ion Microprobe Facility at the University of Edinburgh to make novel measurements of sulfur and its isotopes in sediments and volcanic material. Most of the project budget will support a Columbia Ph.D. student, a Columbia undergraduate, and an Oxford postdoc. The PI Team of Mather, Aiuppa and Plank will incubate special sessions at international meetings and a special journal issue focused on Deep Sulfur. This project, aimed at the very origins of sulfur in magmatic systems, may lead to novel connections between the sulfur supply to ore deposits and volcanic emissions at convergent margins. This international project targets major unknowns in the sulfur cycle at subduction zones. The US-NSF focus of this project will fill a key knowledge gap in terms of S inputs to the mantle at subduction zones. It will involve extensive analysis of sedimentary sections at the Tonga, Marianas, Aleutians, Alaska and Central America trenches, chosen to represent end-member oceanic environments for sulfur deposition and diagenesis and extreme isotopic variations. Ocean Drilling Programs cores will be analyzed by XRF core scanning, a strategic approach to quantify heterogeneously disseminated pyrite and barite, major hosts of sulfur in sediment. Core scanning results will guide discrete sampling for bulk sulfur and sulfur isotope analyses at the University of Palermo by coupled Elemental Analyzer-Mass Spectrometry with a focus on the sulfide- vs. sulfate-dominated regimes that may occur in a single sedimentary section. The outcome will be the first comprehensive estimates (with uncertainties) for the fluxes and isotopic compositions of S into end-member trenches and improved global estimates. The UK-NERC part of this project will take a novel approach to understanding volcanic arc S outputs. It will measure for the first time the sulfur isotopic composition in undegassed olivine-hosted arc melt inclusions. Planned work will include well-studied melt inclusions suites from the same subducting systems as the sediment targets above. This will ensure close collaboration between the US, UK and Italian parts of this project, and allow for the first-time direct tracing of sulfur isotopes from sediment input to arc output. This project will not only provide the first comprehensive sediment input sulfur fluxes and arc isotopic compositions for any subduction zone, but also test the competing hypotheses that the concentrations and isotopic compositions of arc volcanic sulfur reflect a) the subducted inputs or b) the fractionation of sulfur species and isotopes in the subduction zone.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

这是一个由国家科学基金会地球科学局（NSF/GEO）和英国国家环境研究委员会（NERC）共同资助的项目。该协议允许该机构提交和同行评审的一项联合提案，其调查员的预算比例最大。成功确定裁决后，每个机构都为预算的比例和与其自己的国家相关的调查人员提供了资金。硫磺是地球环境中的关键要素。当火山爆发时，将硫弹入大气中，并具有冷却作用。硫还是铅和锌等经济金属的运输代理和托管。控制着火山和金属沉积物的硫群的一系列因素仍然是科学的主要问题，该项目试图回答这个项目。硫的一种可能的来源包括海底上的沉积物，这些沉积物被俯冲到地球到岩浆形成的深度。该项目是通过首次测量在不同俯冲区域为火山系统供应火山系统的通量来检验这一假设的。 来自美国（哥伦比亚大学），英国大学（牛津大学）和意大利大学（巴勒莫大学）的科学家团队将与德克萨斯A＆M大学的海洋钻井计划以及爱丁堡大学的NERC ION Microprobe设施，以对硫磺及其在沉积物和火山材料中的同位素进行新颖的测量。项目预算的大部分将支持哥伦比亚博士学位。学生，哥伦比亚本科生和牛津博士后。 Mather，Aiuppa和Plank的PI团队将在国际会议上孵化特殊会议，并以深层硫磺为重点。该项目针对岩浆系统中硫的起源，可能会导致硫供应与矿石沉积物与融合边缘处的火山排放之间的新联系。这个国际项目针对俯冲带硫周期中的主要未知数。该项目的US-NSF重点将填补俯冲带的S输入的关键知识差距。它将涉及对汤加，玛丽安娜，阿留申群岛，阿拉斯加和中美洲战es的沉积区的广泛分析，被选为代表硫磺沉积和成岩作用以及极端同位素变化的最终成员的海洋环境。海洋钻井程序将通过XRF核心扫描来分析核心，XRF核心扫描是一种量化异质散布黄铁矿和Barite的战略方法，这是沉积物中主要硫的主要硫宿主。核心扫描结果将通过耦合元素分析仪 - 质谱法在巴勒莫大学进行散装硫和硫同位素分析的离散抽样，重点是硫化物与硫酸盐占主导地位的方案，这些方案可能发生在单个沉积物中。结果将是第一个全面的估计（不确定性），该估计值是S成员沟渠中S的通量和同位素组成，并改善了全球估计。该项目的英国-NERC部分将采用一种新颖的方法来了解火山弧的产量。它将首次测量未量化的橄榄石托管融合物中的硫同位素组成。计划的工作将包括与上述沉积物目标相同的俯冲系统的融化融合物套件。这将确保该项目的美国，英国和意大利部分之间的密切合作，并允许首次直接跟踪硫同位素从沉积物输入到ARC输出。 This project will not only provide the first comprehensive sediment input sulfur fluxes and arc isotopic compositions for any subduction zone, but also test the competing hypotheses that the concentrations and isotopic compositions of arc volcanic sulfur reflect a) the subducted inputs or b) the fractionation of sulfur species and isotopes in the subduction zone.This award reflects NSF's statutory mission and has使用基金会的知识分子优点和更广泛的审查标准，被认为值得通过评估来支持。

项目成果

Sulfur from the subducted slab dominates the sulfur budget of the mantle wedge under volcanic arcs

来自俯冲板片的硫主导了火山弧下地幔楔的硫收支

• DOI: 10.1016/j.epsl.2022.117948
• 发表时间: 2023
• 期刊: Earth and Planetary Science Letters
• 影响因子: 5.3
• 作者: Taracsák, Z.;Mather, T.A.;Ding, S.;Plank, T.;Brounce, M.;Pyle, D.M.;Aiuppa, A.
• 通讯作者: Aiuppa, A.

Constraints on the sulfur subduction cycle in Central America from sulfur isotope compositions of volcanic gases

火山气体硫同位素组成对中美洲硫俯冲旋回的制约

• DOI: 10.1016/j.chemgeo.2021.120627
• 发表时间: 2022
• 期刊: Chemical Geology
• 影响因子: 3.9
• 作者: de Moor, J. Maarten;Fischer, Tobias P.;Plank, Terry
• 通讯作者: Plank, Terry

Sulfur_X: A Model of Sulfur Degassing During Magma Ascent

Sulfur_X：岩浆上升过程中硫脱气的模型

• DOI: 10.1029/2022gc010552
• 发表时间: 2023
• 期刊: Geosystems
• 作者: Ding, Shuo;Plank, Terry;Wallace, Paul J.;Rasmussen, Daniel J.
• 通讯作者: Rasmussen, Daniel J.