Site Survey for IODP Proposal 646-Full:- Icelandic V-Shaped-Ridges
IODP 提案 646-Full 的现场调查:- 冰岛 V 形山脊
基本信息
- 批准号:NE/G001251/1
- 负责人:
- 金额:$ 2.42万
- 依托单位:
- 依托单位国家:英国
- 项目类别:Research Grant
- 财政年份:2008
- 资助国家:英国
- 起止时间:2008 至 无数据
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This Urgency Grant Proposal aims to take advantage of a site survey opportunity in support of a UK-led IODP proposal to drill the North Atlantic basement. A bid made last October to the Science Foundation, Ireland and the Irish Marine Institute by Steve Jones (Trinity Colege, Dublin) and Bramley Murton (NOCS) resulted in 450,0000 euros of ship-time being awarded. The Celtic Explorer has been made available to Jones and Murton between mid-April and mid-May 2008. To support this expedition, funds are sought to mobalise and set-up a portable multibeam exchosounder (Reson 8160), and to hire several dredges from NMFD. The costs are modest, at about 2.5% of the ship-time. The scientific objectives are to map and sample along the strike of a V-shaped ridge that is exposed on the western flank of the Rejkanes Ridge, southwest of Iceland. This Urgency Grant Proposal is in support of a major, UK-led, IODP proposal (646-Full) that addresses fundamental questions about the causes of fluctuations in the activity of volcanic hotspots and their effects on the Earth's environment including climate. Does deep upwelling in the mantle, localized temperature and compositional anomalies, or shallow-mantle flow cause hotspot fluctuations? What are the time scales and rates involved? Where mantle flow is involved, what is its fate as it flows away from a hotspot? To address these issues, we propose to sample time-transgressive features that are common where hotspots interact with mid-ocean spreading ridges. These phenomena are exceptionally clearly developed for the Iceland-Reykjanes Ridge couplet where a series of diachronous V-shaped ridges (VSR's) preserve a record of changing hotspot activity, over the last 35Ma, on the floor of the North Atlantic. Linked to these fluctuations in the Iceland hotspot are variations in the flux of North Atlantic Component Water (NACW) that drives the 'global ocean conveyor' and whose return flow is manifest as the North-Atlantic Drift that moderates the climate of northwestern Europe. The significance of the Iceland VSR's as indicators of the processes of hotspot fluctuations has been recognised in the recent Large Igneous Province IODP Workshop (Colrain, 2007). Sampling the diachronous VSR's by drilling on the flanks of the Reykajnes Ridge in the North Atlantic is the only way to access this geological record. We propose to sample lavas from a transect along one of the youngest VSR's, exposed on the western flank of Reykjanes Ridge. The geochemistry of these lavas will yield insights into the genesis of the VSR's, and hence the causes and processes of hotspot fluctuation. The nature of the questions being addressed and our methodology have been informed from four separate, internationally sponsored workshops over the past 4 years. During the most recent, an UK-IODP workshop 'Rift2Ridge '07', Southampton, 2007, we identified an important link between this proposal and another IODP proposal by Wright et al, (in prep.) that aims to investigate the correlation between the initiation of VSR's on Iceland and fluctuations of NACW overflow strength.
这一紧急赠款提案旨在利用现场调查机会,支持英国领导的IODP钻探北大西洋基底的提案。去年10月,史蒂夫·琼斯(都柏林的Trinity学院)和布拉姆利·默顿(NOCS)向科学基金会、爱尔兰和爱尔兰海洋研究所投标,获得了45万欧元的船期。凯尔特探险家已经提供给琼斯和莫顿之间的四月中旬和五月中旬2008年。为了支持这次考察,寻求资金来移动和设置一个便携式多波束exchosounder(Reson 8160),并从NMFD租用几个挖泥船。成本不高,约占运输时间的2.5%。科学目标是绘制冰岛西南部Rejkanes海脊西侧暴露的V形海脊走向的地图并沿其沿着取样。这项紧急拨款提案是为了支持一项由英国领导的重大IODP提案(646-Full),该提案解决了有关火山热点活动波动原因及其对地球环境(包括气候)影响的基本问题。地幔深部上升流、局部温度和成分异常或浅地幔流是否会引起热点波动?所涉及的时间尺度和比率是什么?当地幔流从热点流出时,它的命运是什么?为了解决这些问题,我们建议采样的时间海侵功能是常见的热点与洋中扩张脊的相互作用。这些现象是非常清楚的冰岛-雷克雅未克海脊对,其中一系列的穿时V形脊(VSR的)保存在过去的35 Ma,在北大西洋的地板上的热点活动的变化记录。与冰岛热点的这些波动有关的是北大西洋成分水(NACW)通量的变化,NACW驱动着“全球海洋输送带”,其回流表现为北大西洋漂移,缓和了欧洲西北部的气候。冰岛VSR作为热点波动过程指标的重要性已在最近的大型火成岩省IODP研讨会(Colrain,2007年)中得到认可。通过在北大西洋的Reykajnes海岭的侧翼钻探对穿时振动时效进行取样是获得这一地质记录的唯一途径。我们建议从雷克雅内斯山脊西侧暴露的最年轻的VSR之一的横断面沿着采集熔岩样本。这些熔岩的地球化学将有助于了解VSR的成因,从而了解热点波动的原因和过程。所处理问题的性质和我们的方法是从过去四年中国际赞助的四个独立讲习班中了解到的。在最近的一次UK-IODP研讨会“Rift 2 Ridge '07”(南安普顿,2007年)中,我们发现了该提案与Wright等人(正在准备中)的另一个IODP提案之间的重要联系。旨在研究冰岛VSR启动与NACW溢流强度波动之间的相关性。
项目成果
期刊论文数量(10)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
An integrated kinematic and geochemical model to determine lithospheric extension and mantle temperature from syn-rift volcanic compositions
- DOI:10.1016/j.epsl.2008.11.012
- 发表时间:2009-02
- 期刊:
- 影响因子:5.3
- 作者:S. Dean;B. Murton;T. Minshull;T. Henstock;R. White
- 通讯作者:S. Dean;B. Murton;T. Minshull;T. Henstock;R. White
Geochemical evidence of Milankovitch cycles in Atlantic Ocean ferromanganese crusts
- DOI:10.1016/j.epsl.2020.116651
- 发表时间:2021-01
- 期刊:
- 影响因子:5.3
- 作者:P. Josso;T. Peer;M. Horstwood;P. Lusty;B. Murton
- 通讯作者:P. Josso;T. Peer;M. Horstwood;P. Lusty;B. Murton
Development of a Correlated Fe-Mn Crust Stratigraphy Using Pb and Nd Isotopes and Its Application to Paleoceanographic Reconstruction in the Atlantic
利用 Pb 和 Nd 同位素建立相关铁锰地壳地层学及其在大西洋古海洋重建中的应用
- DOI:10.1029/2020pa003928
- 发表时间:2020
- 期刊:
- 影响因子:3.5
- 作者:Josso P
- 通讯作者:Josso P
Carlsberg Ridge and Mid-Atlantic Ridge: Comparison of slow spreading centre analogues
- DOI:10.1016/j.dsr2.2015.04.021
- 发表时间:2015-11
- 期刊:
- 影响因子:3
- 作者:B. Murton;P. Rona
- 通讯作者:B. Murton;P. Rona
Analysis of deep-ocean sediments from the TAG hydrothermal field (MAR, 26° N): application of short-wave infrared reflectance (SWIR) spectra for offshore geochemical exploration
TAG 热液场(3 月,北纬 26°)深海沉积物分析:短波红外反射(SWIR)光谱在近海地球化学勘探中的应用
- DOI:10.1007/s11368-020-02691-3
- 发表时间:2020
- 期刊:
- 影响因子:3.6
- 作者:Milinovic J
- 通讯作者:Milinovic J
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Bramley Murton其他文献
Bramley Murton的其他文献
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{{ truncateString('Bramley Murton', 18)}}的其他基金
Testing for the Pulse of the Iceland Plume: IODP EXP.395
测试冰岛羽流的脉动:IODP EXP.395
- 批准号:
NE/W002167/1 - 财政年份:2021
- 资助金额:
$ 2.42万 - 项目类别:
Research Grant
ULTRA - Ultramafic-hosted mineral Resource Assessment
ULTRA - 超镁铁质托管的矿产资源评估
- 批准号:
NE/S004068/1 - 财政年份:2020
- 资助金额:
$ 2.42万 - 项目类别:
Research Grant
FAPESP Marine ferromanganese deposits - a major resource of E-tech elements (MarineE-tech)
FAPESP 海洋铁锰矿床 - 电子技术元素的主要资源 (MarineE-tech)
- 批准号:
NE/M011186/2 - 财政年份:2019
- 资助金额:
$ 2.42万 - 项目类别:
Research Grant
FAPESP Marine ferromanganese deposits - a major resource of E-tech elements (MarineE-tech)
FAPESP 海洋铁锰矿床 - 电子技术元素的主要资源 (MarineE-tech)
- 批准号:
NE/M011186/1 - 财政年份:2015
- 资助金额:
$ 2.42万 - 项目类别:
Research Grant
The E-tech element potential of submarine ferromanganese crusts
海底铁锰结壳的电子技术元素潜力
- 批准号:
NE/L002353/1 - 财政年份:2013
- 资助金额:
$ 2.42万 - 项目类别:
Research Grant
Investigating the influence of lithology and water depth on the composition and distribution of sulphides at the worlds deepest known vent sites.
研究岩性和水深对世界上已知最深喷口处硫化物成分和分布的影响。
- 批准号:
NE/I01442X/1 - 财政年份:2011
- 资助金额:
$ 2.42万 - 项目类别:
Research Grant
Hydrothermal activity and deep-ocean biology of the Mid-Cayman Rise
开曼中隆隆的热液活动和深海生物学
- 批准号:
NE/F017758/1 - 财政年份:2009
- 资助金额:
$ 2.42万 - 项目类别:
Research Grant
Structure and evolution of Axial Volcanic Ridges: Constraining the architecture, chronology and evolution of ocean ridge magmatism
轴状火山脊的结构和演化:制约洋脊岩浆作用的结构、年代和演化
- 批准号:
NE/G00126X/1 - 财政年份:2008
- 资助金额:
$ 2.42万 - 项目类别:
Research Grant
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