Collaborative Research: Mantle Volatiles in an Emerging Ocean Basin: H2O, CO2, and He & Ar Isotopes in Basalts from the Gulf of Aden Spreading Center System
合作研究:新兴洋盆中的地幔挥发物:H2O、CO2 和 He
基本信息
- 批准号:1259916
- 负责人:
- 金额:$ 7万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2013
- 资助国家:美国
- 起止时间:2013-08-01 至 2018-07-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Continental rifts and ocean spreading ridges are key places where volatile elements are exchanged between Earth's interior and its surface. Volatiles play a central role in the initiation of rifting/spreading, in volcanic evolution, and in associated geologic hazards. This research characterizes major volatile concentrations (H2O and CO2) and mantle source tracers (helium and argon isotopes) in magma erupted along the mid-ocean ridge in the Gulf of Aden in the Arabian Sea because this is a mid-ocean spreading center in its early stages of formation and evolution. The research also quantifies the flux of water coming from the mantle in the region. The Gulf of Aden is a unique locality for this work because it is a young ocean basin influenced by flow from the Afar mantle plume under the Horn of Africa. The plume affects the base of the Arabian lithosphere along the Red Sea and the western part of the Gulf of Aden; and its widespread influence is thought to result from the channeling of asthenospheric magma from the plume to the spreading center by rifts. However, the Afar Plume's apparent weaker penetration into the Gulf of Aden is not well understood and may be related to tectonic segmentation/discontinuities of the spreading ridge. The research will analyze submarine basalt glasses that were collected from previous oceanographic and sampling expeditions to the area for major element composition, volatile concentrations (CO2, H2O, Cl, F and S), and He and Ar isotopes. Initial results for Aden basalt glasses reveal a strong plume signal that may become rapidly attenuated with distance from the plume axis. Project goals are to determine how partial melting and degassing control mantle volatile signatures in young ocean spreading centers. Geochemical evidence (e.g., 3He/4He, 40Ar/36Ar, 4He/40Ar*, CO2/Nb, H2O/Ce) in about 40 basalt glasses from this region will be used to make this determination. Results of the study allow us to quantify variation in the volatile flux from the Afar plume and the upper mantle along the length of this emerging ocean basin between 44°E and 57°E. The results also provide a basic framework needed for geophysical and geodynamic models in terms of model input for regional and smaller scale variations in mantle composition, partial melting, and the heat and mass flux associated with the evolution from continental rifting to oceanic spreading. Broader impacts of the work include support of graduate and undergraduate students at two institutions, one in an EPSCoR state (Oklahoma), leverages existing samples collected with prior NSF support, and utilization of NSF-funded analytical facilities at Oregon State University and the University of Tulsa. Results will be described on institutional web pages as well as NSF-funded publically available data systems. Findings will also be incorporated into classes taught by the investigators.
大陆裂谷和海洋扩张海脊是挥发性元素在地球内部和表面之间交换的关键地方。挥发物在裂谷/扩散的启动、火山演化和相关的地质灾害中起着核心作用。这项研究描述了沿阿拉伯海亚丁湾大洋中脊喷发的岩浆中的主要挥发性浓度(H2O和CO2)和地幔来源示踪(氦和Ar同位素),因为这是一个大洋中部扩张中心,处于形成和演化的早期阶段。这项研究还量化了该地区来自地幔的水的流量。亚丁湾是这项工作的独特地点,因为它是一个年轻的洋盆,受到非洲之角下方阿法尔地幔羽流的影响。这股热柱影响着红海沿岸和亚丁湾西部的阿拉伯岩石圈的底部;它的广泛影响被认为是由于裂谷将软流圈岩浆从热柱输送到扩张中心。然而,阿法尔羽流对亚丁湾的穿透力明显较弱,目前还不清楚,可能与扩张海脊的构造分段/不连续有关。这项研究将分析从之前对该地区进行的海洋和采样考察中收集的海底玄武岩玻璃的主要元素组成、挥发性浓度(二氧化碳、H2O、氯、F和S)以及氦和Ar同位素。亚丁玄武岩玻璃的初步结果显示,一个强烈的羽流信号可能会随着离羽流轴的距离而迅速减弱。该项目的目标是确定部分熔融和脱气如何控制年轻海洋扩张中心的地幔挥发性特征。该地区约40个玄武岩玻璃中的3He/4He、40Ar/36Ar、4He/40Ar*、CO2/Nb、H2O/Ce等地球化学证据将被用来进行这一测定。研究结果使我们能够量化在44°E至57°E之间来自阿法尔羽流和上地幔的挥发通量沿这一新兴洋盆长度的变化。研究结果还提供了地球物理和地球动力学模型所需的基本框架,用于研究地幔成分、部分熔融以及与大陆裂谷向海洋扩张演化有关的区域和较小尺度变化的模型输入。这项工作的更广泛影响包括支持两个机构的研究生和本科生,其中一个在EPSCoR州(俄克拉荷马州),利用先前NSF支持下收集的现有样本,以及利用NSF资助的俄勒冈州立大学和塔尔萨大学的分析设施。结果将在机构网页以及由国家科学基金会资助的公共数据系统上描述。调查结果也将被纳入调查人员的课堂教学。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Peter Michael其他文献
A back-arc in time
时间上的后弧
- DOI:
10.1038/469170a - 发表时间:
2011-01-12 - 期刊:
- 影响因子:48.500
- 作者:
Peter Michael - 通讯作者:
Peter Michael
A back-arc in time
时间上的后弧
- DOI:
10.1038/469170a - 发表时间:
2011-01-12 - 期刊:
- 影响因子:48.500
- 作者:
Peter Michael - 通讯作者:
Peter Michael
Lava without the fizz
没有气泡的熔岩
- DOI:
10.1038/419445a - 发表时间:
2002-10-03 - 期刊:
- 影响因子:48.500
- 作者:
Peter Michael - 通讯作者:
Peter Michael
Peter Michael的其他文献
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{{ truncateString('Peter Michael', 18)}}的其他基金
Collaborative Research: Carbon-Helium-Argon Isotope Relations at High-3He/4He Hotspots and Implications for Mantle Dynamics
合作研究:高 3He/4He 热点的碳-氦-氩同位素关系及其对地幔动力学的影响
- 批准号:
1763259 - 财政年份:2018
- 资助金额:
$ 7万 - 项目类别:
Standard Grant
Collaborative Research: Examining Upper Mantle Volatile History Through Isotopic Variations of Carbon, Nitrogen, Hydrogen and Noble Gases in Undegassed Mid-Ocean Ridge Basalts
合作研究:通过未脱气的大洋中脊玄武岩中碳、氮、氢和稀有气体的同位素变化检查上地幔挥发历史
- 批准号:
1558802 - 财政年份:2016
- 资助金额:
$ 7万 - 项目类别:
Standard Grant
Studying Eruptions and Lava Flows on Ontong Java Plateau with High-Precision Glass Chemistry
利用高精度玻璃化学研究翁通爪哇高原的喷发和熔岩流
- 批准号:
1132038 - 财政年份:2011
- 资助金额:
$ 7万 - 项目类别:
Standard Grant
Collaborative Research: Geochemical investigations of newly discovered back-arc spreading centers in the northeastern Lau Basin
合作研究:劳盆地东北部新发现的弧后扩张中心的地球化学调查
- 批准号:
0752256 - 财政年份:2008
- 资助金额:
$ 7万 - 项目类别:
Standard Grant
Collaborative Research: Origin of Crust and the Temporal and Spatial Scales of Mantle Melting at the Endeavour Segment, Juan de Fuca Ridge
合作研究:胡安德富卡海岭奋进段的地壳起源和地幔融化的时空尺度
- 批准号:
0623156 - 财政年份:2006
- 资助金额:
$ 7万 - 项目类别:
Continuing Grant
Mantle Heterogeneity and Melting and Magma Transport Beneath the Ultraslow-Spreading Gakkel Ridge: Evidence from Volatiles and Trace Elements
超慢速扩张的加克尔海脊下方的地幔异质性、熔融和岩浆输送:来自挥发物和微量元素的证据
- 批准号:
0425892 - 财政年份:2004
- 资助金额:
$ 7万 - 项目类别:
Standard Grant
Collaborative Research: Integrated Hydrothermal and Petrological Studies of the Eastern Lau Spreading Center
合作研究:东刘扩散中心的综合热液和岩石学研究
- 批准号:
0242902 - 财政年份:2004
- 资助金额:
$ 7万 - 项目类别:
Standard Grant
Collaborative Research: Chemical Geodynamics of the Galapagos Mantle Plume-Spreading Center System
合作研究:加拉帕戈斯地幔柱扩散中心系统的化学地球动力学
- 批准号:
0241478 - 财政年份:2003
- 资助金额:
$ 7万 - 项目类别:
Standard Grant
Development of Seafloor Sampling and Hydrothermal Detection Tools for Use in Ice-Covered Seas
开发用于冰层海洋的海底采样和热液探测工具
- 批准号:
0107767 - 财政年份:2001
- 资助金额:
$ 7万 - 项目类别:
Standard Grant
Collaborative Research: Mantle Melting and Crustal Genesis at the Slowest Spreading Rate: A Petrological investigation of Gakkel Ridge, Arctic Ocean
合作研究:最慢扩散速度下的地幔融化和地壳成因:北冰洋加克尔海脊的岩石学调查
- 批准号:
9911795 - 财政年份:2000
- 资助金额:
$ 7万 - 项目类别:
Continuing Grant
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