Magmatic Volatiles, Unraveling the Reservoirs and Processes of the Volcanism in the Antarctic Peninsula

岩浆挥发物，揭示南极半岛火山活动的储层和过程

• 批准号: 1643494
• 负责人: Alberto Saal
• 金额: $ 27.01万
• 依托单位: Brown University
• 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: 2017-03-01 至 2022-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1643494&HistoricalAwards=false
• 关键词: Magmatic; Volatiles; Unraveling; Reservoirs; Processes

The Earth's mantle influences the movement of tectonic plates and volcanism on the surface. One way to understand the composition and nature of the Earth's mantle is by studying the chemistry of basalts, which originate by volcanic eruptions of partially melting mantle rocks. This study will establish the budget and distribution of volatile elements (hydrogen, carbon, fluorine, chlorine, sulfur) in volcanic basalts to better understand the composition of the Earth's interior. Volatiles influence mantle melting, magma crystallization, magma migration and volcanic eruptions. Their abundances and spatial distribution provide important constraints on models of mantle flow and temperature. Moreover, volatiles are key constituents of the Earth's atmosphere and oceans. Establishing the cycles of volatiles between the Earth's interior and surface is of fundamental importance to understand the long-term evolution of our planet. This project supports a graduate student and research scientist at Brown University. It promotes the collaboration with geochemists from eleven institutions representing six different countries: USA, Germany, United Kingdom, Argentina, South Korea and Japan, and utilizes several NSF-funded USA analytical facilities. Communication of results will occur through: 1) peer-reviewed journals, presentations at conferences and invited university lectures, 2) hands-on science learning activities for local elementary and high school classes, and 3) outreach to the general audience through public lectures.Over the last 60 years of funded research, the Antarctic Peninsula and nearby ocean ridges have been extensively investigated providing information on the origin of the magmatism, and the composition, structure, temperature and evolution of the lithospheric and asthenospheric mantle. Diverse hypotheses have been proposed for the origin of the magmatism in the Antarctic Peninsula, from flux melting of the mantle wedge during devolatilization of the subducted Phoenix plate, to adiabatic decompression melting of a carbonated and hydrous asthenosphere, to melting of a volatile-rich metasomatized subcontinental lithospheric mantle. All proposed hypotheses invoke the role of volatiles. Surprisingly, data on the volatile contents of basalts and mantle from this region are non-existent. This is a significant omission from the geochemical data set, given the important role volatile elements play in the generation and composition of magmas and their sources. The focus of our research is to examine the regional variations in volatile contents (C, H, F, S, Cl) in geochemically well-characterized Pliocene-recent basalts from the Antarctic Peninsula and Phoenix ridge. Our goal is to establish the budget and distribution of volatiles in the mantle to understand 1) the processes responsible for the generation of chemically diverse basalts in close spatial and temporal proximity and 2) the nature (lithology, composition and temperature) of the heterogeneous mantle source beneath the Antarctic Peninsula and Phoenix ridge.

地球的地幔会影响构造板和火山在地面上的运动。 理解地球披风的组成和性质的一种方法是研究玄武岩的化学反应，该化学源于部分融化的地幔岩石的火山喷发。 这项研究将建立火山玄武岩中挥发性元件（氢，碳，氟，氯，硫）的预算和分布，以更好地了解地球内部的组成。 挥发物影响地幔熔化，岩浆结晶，岩浆迁移和火山喷发。 它们的丰度和空间分布提供了对地幔流量和温度模型的重要限制。此外，挥发物是地球大气和海洋的关键组成部分。 建立地球内部和表面之间挥发物的周期对于了解我们地球的长期演变至关重要。 该项目支持布朗大学的研究生和研究科学家。它促进了与代表六个不同国家的11个机构的地球化学主义者的合作：美国，德国，英国，阿根廷，韩国和日本，并利用了几家NSF资助的美国分析设施。 结果的交流将通过以下方式进行：1）经过同行评审的期刊，会议和被邀请的大学讲座，2）为当地小学和高中班的动手科学学习活动，以及3）3）通过公共讲座向一般受众介绍。以及过去60年的资助研究的60年和岩石圈和软圈地幔的进化。已经提出了多种假设，该假设是在南极半岛中的岩浆症的起源，从俯冲腓尼基板的泛滥期间的地幔楔融化到碳酸和氢磷酸和氢磷的绝热减压融化的融化到挥发性富含挥发性富含挥发性的富含挥发性的Meatsatient supertic subcertic lithIth lithIth lithcosterial lithcosterial lithcossigatizan lithcossigation。所有提出的假设都唤起了挥发物的作用。令人惊讶的是，该区域的玄武岩和地幔挥发性含量的数据不存在。鉴于摇动元素在岩浆及其来源的产生和组成中起着重要的作用，这是对地球化学数据集的重大遗漏。我们研究的重点是检查来自南极半岛和菲尼克斯山脊的地球化学上良好的上新世盆地的挥发性含量（C，H，F，S，CL）的区域变化。我们的目标是建立衬垫中挥发物的预算和分配，以了解1）在近距离和时间接近的过程中产生化学多样的底层的过程，以及2）在异源半岛和菲尼克斯山脊下的异质地幔源的性质（岩性，成分和温度）。

项目成果

Source variations in volatile contents between Bransfield Strait and Phoenix Ridge, Antarctica

布兰斯菲尔德海峡和南极洲凤凰岭之间挥发物含量的来源变化

• DOI: 10.7185/gold2021.8087
• 发表时间: 2021
• 期刊: Goldschmidt Conference
• 作者: Anderson, Danny;Saal, Alberto;Riley, Teal;Keller, Randall;Haase, Karsten;Mallick, Soumen;Wang, Jianhua
• 通讯作者: Wang, Jianhua

Source Variations in Bransfield Strait and Relation to Nearby Phoenix Ridge

布兰斯菲尔德海峡的源头变化及其与附近凤凰岭的关系

• DOI: 10.46427/gold2020.61
• 发表时间: 2020
• 期刊: Goldschmidt Conference
• 作者: Anderson, Danny W.;Saal, Alberto E.;Riley, Teal R.;Keller, Randall A.;Haase, Karsten M.;Mallick, Soumen;Wang, Jianhua;Boesenberg, Joseph S.
• 通讯作者: Boesenberg, Joseph S.