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Sulfur Isotopes in Subduction Systems and the Global Sulfur Cycle

俯冲系统中的硫同位素和全球硫循环

基本信息

批准号：
1725301
负责人：
Alicia Cruz-Uribe
金额：
$ 34.14万
依托单位：
University of Maine
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-09-01 至 2022-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1725301&HistoricalAwards=false
关键词：
Sulfur Isotopes Subduction Systems Global

项目摘要

Sulfur is one of the most abundant elements in the Earth, is an essential ingredient for life, and plays a pivotal role in geologic and environmental processes. A large part of the global sulfur cycle involves exchange between the surface and interior of the Earth at subduction zones, where one tectonic plate sinks beneath another. As a volatile element, sulfur has the potential to be released into the Earth's mantle during the physical and chemical changes that take place during subduction. Sulfur released during subduction can be re-introduced into the atmosphere from subduction-related volcanic arcs, such as those found along the Pacific rim. While the chemistry of sulfur released at volcanic arcs has been well studied, the mechanism by which sulfur is released during subduction, and the effects of subducted sulfur on the mineralogy of the upper mantle, the volcanic arc, and arc-associated ore deposits (i.e., gold and copper), are poorly constrained. This team's work addresses this knowledge gap in the sulfur cycle by directly examining sulfur-bearing minerals in rocks from ancient subducted plates and deep arc volcanic systems, which have been brought back to the surface of the Earth via tectonic processes. Using a combination of field-based observations and thermodynamic modeling, one of the most important outcomes of this work will be the identification of coupled sulfide-silicate reactions that occur within subducting slabs. The oxidation state of the fluids released during these reactions has important consequences for the redox state of the upper mantle and volcanic arc system. These observations will be coupled with analyses of the sulfur isotopic signature of sulfides from exhumed high-pressure rocks and deep arc crustal cumulates, which will provide a tracer for different sources of sulfur throughout the entire subduction process. A broad range of lithologies, including meta-sediments and meta-igneous rocks, will be analyzed in order to capture the scope of subducted sulfur isotope values. In combining sulfur isotope signatures with the reactions that likely take place in a variety of subducted lithologies, the redox and isotopic composition of sulfur-related fluids that feed arc volcanic systems will be characterized in a way that has never been done before. These linkages will be tested by quantifying the sulfur isotopic signature of sulfides in deep crustal arc cumulates from the Lesser Antilles arc, which provides a novel opportunity to test how differences in subducted sediment across an arc may influence the sulfur isotopic signature in the volcanic arc. This work will provide University of Maine students with access to techniques not currently available in the State of Maine.

硫是地球上最丰富的元素之一，是生命的基本成分，在地质和环境过程中起着关键作用。全球硫循环的很大一部分涉及地球表面和内部在俯冲带的交换，在那里一个构造板块下沉到另一个板块之下。作为一种挥发性元素，硫有可能在俯冲过程中发生的物理和化学变化中被释放到地幔中。在俯冲过程中释放的硫可以从与俯冲有关的火山弧重新引入大气，例如沿太平洋边缘发现的火山弧。虽然火山弧释放的硫的化学性质已经得到了很好的研究，但在俯冲过程中硫释放的机制，以及俯冲硫对上地幔、火山弧和与火山弧相关的矿床（即金和铜）矿物学的影响却知之甚少。该团队的工作通过直接检查来自古代俯冲板块和深弧火山系统的岩石中的含硫矿物来解决硫磺循环中的这一知识缺口，这些岩石通过构造过程被带回地球表面。结合现场观测和热力学建模，这项工作最重要的成果之一将是确定发生在俯冲板块内的硫化物-硅酸盐耦合反应。在这些反应中释放的流体的氧化状态对上地幔和火山弧系统的氧化还原状态有重要影响。这些观测将与挖掘出的高压岩石和深弧地壳堆积中硫化物的硫同位素特征分析相结合，这将为整个俯冲过程中不同来源的硫提供示踪剂。为了捕捉俯冲硫同位素值的范围，将分析广泛的岩性，包括变质沉积岩和变质火成岩。通过将硫同位素特征与各种俯冲岩性中可能发生的反应相结合，弧火山系统中硫相关流体的氧化还原和同位素组成将以一种前所未有的方式进行表征。这些联系将通过量化来自小安的列斯弧的深地壳弧积累物中硫化物的硫同位素特征来测试，这为测试弧上俯冲沉积物的差异如何影响火山弧中的硫同位素特征提供了一个新的机会。这项工作将为缅因大学的学生提供目前在缅因州无法获得的技术。

项目成果

期刊论文数量（18）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Sulfide Geochemistry of Cumulates from the Lesser Antilles Arc

小安的列斯群岛弧累积物的硫化物地球化学

DOI：
发表时间：
2018
期刊：
Goldschmidt Abstracts
影响因子：
0
作者：
Pollock, T.;Cruz-Uribe, A.M.;Marschall, H.;Blundy, J.
通讯作者：
Blundy, J.

Accessory phases as recorders of subduction redox: Sulfide–oxide– silica equilibria during high-pressure metamorphism

作为俯冲氧化还原记录器的副相：高压变质过程中的硫化物-氧化物-二氧化硅平衡

DOI：
发表时间：
2018
期刊：
AGU
影响因子：
0
作者：
Walters, JB;Cruz-Uribe, AM;Marschall, HR
通讯作者：
Marschall, HR

TRACE ELEMENT ZONING IN TITANITE FROM SYROS, GREECE: IMPLICATIONS FOR COUPLED SUBSTITUTION MECHANISMS

希腊锡罗斯岛钛矿中的微量元素分区：对耦合替代机制的影响

DOI：
10.1130/abs/2019ne-328246
发表时间：
2019
期刊：
Geological Society of America Abstracts with Programs
影响因子：
0
作者：
Biela, Kimberley;Stone, Joshua S.;Harmon, Natalie;Walters, Jesse B.;Cruz-Uribe, Alicia M.;Marschall, Horst
通讯作者：
Marschall, Horst

Trace element redistribution during rehydration of eclogite via sulfide-silicate reactions

通过硫化物-硅酸盐反应进行榴辉岩再水化过程中的微量元素重新分布