EAGER: Towards a High Resolution Record of Phanerozoic Ocean Chemistry: Links to Plate Tectonics and Climate

渴望：获得显生宙海洋化学的高分辨率记录：与板块构造和气候的联系

• 批准号: 1028663
• 负责人: Emma Rasbury
• 金额: $ 2.72万
• 依托单位: SUNY at Stony Brook
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-05-01 至 2011-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1028663&HistoricalAwards=false
• 关键词: EAGER; Towards; Resolution; Record; Phanerozoic

Towards a High Resolution Record of Phanerozoic Ocean Chemistry: Links to Plate Tectonics and ClimateTroy Rasbury, SUNY StonybrookEAR-1028663ABSTRACTThe oceans are the heart of our planet and are the primary feature that makes Earth different from other planets we have found. Much of the difficulty in constraining models for interlinking of the Earth systems comes from the paucity of reliable archives of past seawater chemistry. PI has chosen to focus on the relationship between Sr and Mg in marine invertebrate fossils to study changes in paleo-seawater. Seawater chemistry is thought to result from the mixing of hydrothermal fluids from ridge spreading centers and continental fluxes as sources, and the sinks of various elements such as in new mineral formation or sorption on existing mineral surfaces. Some geochemical models for seawater have used changes in sea level and volcanism to imply changes in the spreading rates of ocean ridges and their corresponding flux. These models closely predict the changes measured in the marine proxy record. However, other scientists maintain there is no evidence that spreading rates have changed since the Jurassic. These scientists do not address seawater chemistry constraints, and therefore their interpretation requires that another mechanism be sought to produce the observed relationships between sealevel, climate, and seawater chemistry. Another point of conflict with the geochemical record of seawater is the behavior of Sr. While studies based on Sr concentrations in low Mg fossils shells show that Sr behaves inversely to Mg in seawater, a recent Science paper argues that Sr behaves the same Mg in seawater. They suggest that the difference may be a poor understanding of the Kd for Sr in biogenic carbonates. However this would only impact the magnitude of calculated changes, not cause an inverse relationship. PIs research goal is to produce a high resolution record of Mg and Sr from marine fossils to address the issue of how seawater chemistry ties to known tectonic events and climate change in the Cenozoic- and by doing so to perhaps address the overarching question of what causes changes in rates of plate tectonics and how this links to global climate change.

朝着植物学海洋化学的高分辨率记录：与板块构造和气候罗斯伯里的链接，SUNY StonyBrookear-10286663abtracttractthe the Oceans是我们星球的核心，并且是使地球与其他星球不同的主要特征。 限制地球系统相互联系的模型的许多困难来自过去海水化学的可靠档案。 PI选择专注于海洋无脊椎动物化石中的SR和MG之间的关系，以研究古盐水的变化。 人们认为海水化学是由从山脊扩散中心和大陆通量作为来源的水热液以及各种元素的水槽（例如在现有矿物质表面上的新矿物形成或吸附）的下沉而产生的。 一些海水的地球化学模型使用了海平面和火山的变化，暗示着海脊的扩散速率及其相应的通量发生变化。 这些模型仔细预测了海洋代理记录中测得的变化。 但是，其他科学家坚持没有证据表明自侏罗纪以来的传播率已经改变。这些科学家没有应对海水化学限制，因此他们的解释要求寻求另一种机制来产生海上，气候和海水化学之间观察到的关系。 与海水的地球化学记录相冲突的另一个点是SR的行为。而基于低MG化石壳中SR浓度的研究表明，SR在海水中呈现MG的行为，最近的一份科学论文认为SR在海水中的行为相同。 他们认为差异可能是对生物碳酸盐中SR的KD的不良理解。但是，这只会影响计算的变化的幅度，而不会导致相反的关系。 PIS研究的目标是从海洋化石中产生高分辨率记录，以解决海水化学如何与已知的构造事件联系在一起的核酸造影和气候变化的问题，并通过这样做来解决总体问题，即导致板块构造率的变化以及与全球气候变化的链接的原因。