Crystal-melt partitioning under high pressure hydrous conditions.

高压含水条件下的晶体熔融分配。

• 批准号: NE/B502936/2
• 负责人: Bernard Wood
• 金额: $ 10.22万
• 依托单位: University of Oxford
• 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: https://gtr.ukri.org/projects?ref=NE%2FB502936%2F2
• 关键词: Crystal; melt; partitioning; under; pressure

The presence of water inside the earth and on its surface has had the most profound influence on the evolution of our planet. The earth's crust, for example, is created from volcanic eruptions which are driven by water and which degas water to the atmosphere and oceans. Without water the crust would be of quite different composition, of low elevation and there would be no mountains. The degassing of water from inside the earth has created the oceans which were a major factor enabling the development of life. Despite its importance, however, we do not know how much water is left within the earth and we have only sketchy ideas about how water has influenced the compositions of the earth's different layers. The main aim of this project is to test a new hypothesis about the effect of water or the evolution of the earth's mantle, which is the primary source region of lavas arriving at the surface. The hypothesis is that, as material moves towards the surface, it releases water at 410 km depth (a pressure of 140000 atmospheres) and that this water causes melting to produce a thin-layer of water rich volcanic liquid. The remaining solid rises and becomes the main source region for the earth's crust. The liquid remains at depth. Our tests will involve determining the partitioning of large numbers of chemical elements between the upwelling solid minerals and the postulated melt layer. In this way we will be able to determine whether or not the chemical compositions of the outermost layers are consistent with the presence of substantial amounts of water at depth. The high pressure experiments and most of the detailed chemical analyses will be performed in the Earth Sciences department at the University of Bristol. This department has been developed, with NERC support, into a major European centre for high pressure research and microanalysis. Additional microanalysis will be performed at the NERC ion microprobe facility in the Department of Geosciences at the University of Edinburgh.

水在地球内部和表面的存在对我们星球的演变产生了最深远的影响。例如，地壳是由火山喷发产生的，火山喷发是由水驱动的，它将水脱气到大气和海洋中。如果没有水，地壳的成分就会完全不同，海拔会很低，也就不会有山脉。地球内部的水脱气创造了海洋，海洋是生命发展的主要因素。然而，尽管水很重要，我们却不知道地球内部还剩下多少水，而且对于水如何影响地球不同层的组成，我们也只有粗略的概念。这个项目的主要目的是检验一个关于水的影响或地幔演化的新假设，地幔是到达地表的熔岩的主要来源区域。该假说认为，当物质向地表移动时，它会在410公里深处释放水（14万个大气压的压力），这些水会导致融化，产生一层富含水的火山液体。剩余的固体上升，成为地壳的主要源区。液体留在深处。我们的测试将涉及确定大量的化学元素之间的上升流固体矿物和假设的熔体层的分区。这样，我们就能够确定最外层的化学成分是否与深度处存在大量水的情况一致。高压实验和大多数详细的化学分析将在布里斯托大学的地球科学系进行。在NERC的支持下，该部门已发展成为欧洲主要的高压研究和微量分析中心。将在爱丁堡大学地球科学系的NERC离子微探针设施进行额外的微量分析。

项目成果

The oxidation states of niobium and tantalum in mantle melts

• DOI: 10.1016/j.chemgeo.2012.09.002
• 发表时间: 2012-11-10
• 期刊: CHEMICAL GEOLOGY
• 影响因子: 3.9
• 作者: Burnham, Antony D.;Berry, Andrew J.;Cibin, Giannantonio
• 通讯作者: Cibin, Giannantonio

A simple model for chalcophile element partitioning between sulphide and silicate liquids with geochemical applications

• DOI: 10.1016/j.epsl.2013.09.034
• 发表时间: 2013-12-01
• 期刊: EARTH AND PLANETARY SCIENCE LETTERS
• 影响因子: 5.3
• 作者: Kiseeva, Ekaterina S.;Wood, Bernard J.
• 通讯作者: Wood, Bernard J.

Clinopyroxene-melt trace element partitioning and the development of a predictive model for HFSE and Sc

• DOI: 10.1007/s00410-010-0540-0
• 发表时间: 2011-03-01
• 期刊: CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
• 影响因子: 3.5
• 作者: Hill, Eddy;Blundy, Jonathan D.;Wood, Bernard J.
• 通讯作者: Wood, Bernard J.