Towards a petrological explanation for the X-Discontinuity: The role of eclogite
Towards a petrological explanation for the X-Discontinuity: The role of eclogite
批准号:
199969681
负责人:
Professor Dr. Alan Butler Woodland
金额:
$0.0万
依托单位国家:
德国
项目类别:
Research Grants
财政年份:
2011
资助国家:
德国
项目状态:
已结题
起止时间:
2010-12-31 至 2016-12-31
中文摘要
将岩石学模型与地震波速度的不连续性结合起来,是对地球深部结构和成分施加约束的基本手段。在约300公里深度观察到的局部地震特征被称为X-不连续,但到目前为止,对这种不连续的岩石学解释尚不清楚。最新的有趣解释主要涉及辉石从榴辉岩矿物组合中存在的含钙(Ca0.5-0.5Si2O6)单斜辉石(CPx)中出溶。我们的目标是用两步实验方法验证这一假说:1)确定在模型和天然榴辉岩成分中低磷条件下可以并入cpx的最大Ca-Eskola组分,以及2)在较高磷条件下预先合成的组合在辉石稳定场内重新平衡。重点将放在确定辉锌矿析出的条件和监测cpx组成和摩尔体积的变化,以及相分布、微观结构和可能的择优取向。榴辉岩体和X-不连续面之间的联系对于地球动力学模拟和理解洋壳再循环进入地幔所涉及的物理和化学过程具有非常重要的意义。
英文摘要
Combining petrological models with discontinuities in seismic wave velocities is the essential means for placing constraints on the structure and composition in the deep Earth. A local seismic feature observed at ~300 km depth is referred to as the X-discontinuity, but to date, no clear petrologic explanation for this discontinuity is generally accepted. The most recent intriguing explanation primarily involves the exsolution of stishovite from Ca-eskola-bearing (Ca0.5□0.5Si2O6) clinopyroxene (cpx) that is present in an eclogitic mineral assemblage. Our goal is to test this hypothesis using a two-step experimental approach: 1) determining the maximum Ca-eskola-component that can be incorporated in cpx at lower P in model and natural eclogitic compositions, and 2) re-equilibration of pre-synthesised assemblages at higher P within the stishovite stability field. Emphasis will be placed on defining the conditions where stishovite exsolves and monitoring changes in cpx composition and molar volume, as well as in phase distributions, microstructures and possible preferred orientation of the exsolved stishovite. A linkage between eclogite bodies and the X-discontinuity has very important implications for geodynamic modelling and for understanding the physical and chemical processes involved in recycling of oceanic crust into the mantle.
期刊论文(2)
专著(0)
科研奖励(0)
会议论文
DOI:
10.1007/s00410-016-1311-3
发表时间:
2016-11
期刊:
Contributions to Mineralogy and Petrology
影响因子:
3.5
作者:
[F. Schroeder-Frerkes;A. Woodland;L. Uenver-Thiele;K. Klimm;Nadia Knapp]
通讯作者:
F. Schroeder-Frerkes;A. Woodland;L. Uenver-Thiele;K. Klimm;Nadia Knapp
Experimental constraints on coesite abundances in eclogite and implications for the X seismic discontinuity
榴辉岩柯石英丰度的实验限制及其对 X 地震不连续性的影响
DOI:
10.1002/2015jb011933
发表时间:
2013
期刊:
Journal of Geophysical Research: Solid Earth
影响因子:
--
作者:
[napp N, Woodland AB, Klimm K]
通讯作者:
Klimm K
Stabilities and properties of high-pressure oxide phases containing Cr with focus on solid solutions of (Mg,Fe2+)3Fe2O6 – testing for possible precursor phases for inclusions in diamond
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批准号:504772250
-
项目类别:Research Grants
-
资助金额:$0.0万
-
财政年份:2022
-
负责人:Professor Dr. Alan Butler Woodland
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依托单位:
Experimental study of coupled redox equilibria in a peridotite–metasediment–eclogite mélange and implications for diamond formation
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批准号:445062436
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项目类别:Research Grants
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资助金额:$0.0万
-
财政年份:2020
-
负责人:Professor Dr. Alan Butler Woodland
-
依托单位:
Experimental investigation of reduction in the CaO-SiO2-CO2 system with application to the formation of Breyite inclusions in diamonds
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批准号:426912966
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项目类别:Research Grants
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资助金额:$0.0万
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财政年份:2019
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负责人:Professor Dr. Alan Butler Woodland
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依托单位:
Experimental modeling of ferropericlase formation under upper mantle conditions
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批准号:406051903
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项目类别:Research Grants
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资助金额:$0.0万
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财政年份:2018
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负责人:Professor Dr. Alan Butler Woodland
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依托单位:
Oxidation state of the lithospheric mantle beneath Somerset Island, Rae Craton, Canada as a function of depth and its relation to metasomatism
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批准号:393808454
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项目类别:Research Grants
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资助金额:$0.0万
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财政年份:2017
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负责人:Professor Dr. Alan Butler Woodland
-
依托单位:
Experimental study of sulfur solubility in silico-carbonatitic melts at pressures of 6-10 GPa
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批准号:378270953
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项目类别:Research Grants
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资助金额:$0.0万
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财政年份:2017
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负责人:Professor Dr. Alan Butler Woodland
-
依托单位:
Redox melting processes in the mantle under reducing conditions
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批准号:320586258
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项目类别:Research Grants
-
资助金额:$0.0万
-
财政年份:2016
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负责人:Professor Dr. Alan Butler Woodland
-
依托单位:
Sediment-peridotite interaction in a temperature gradient: transport of trace elements and growth of diamonds
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批准号:277898631
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项目类别:Research Grants
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资助金额:$0.0万
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财政年份:2015
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负责人:Professor Dr. Alan Butler Woodland
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依托单位:
Phase relations and partial melting of C-bearing sediment under mantle conditions
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批准号:260637238
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项目类别:Research Grants
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资助金额:$0.0万
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财政年份:2014
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负责人:Professor Dr. Alan Butler Woodland
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依托单位:
Spatial and temporal variations in mantle redox state beneath the Massif Central, France
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批准号:192754881
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项目类别:Research Grants
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资助金额:$0.0万
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财政年份:2010
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负责人:Professor Dr. Alan Butler Woodland
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依托单位:
Fe3+/Fe2+-Bestimmungen an Granaten mit drei unabhängigen Methoden: Mössbauer, EMPA-Flankenmethode und XANES
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批准号:5454515
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项目类别:Research Grants
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资助金额:$0.0万
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财政年份:2005
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负责人:Professor Dr. Alan Butler Woodland
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依托单位:
Oxidation state of garnet and pyroxenes and the estimation of the fo2 in the Garnet Peridotite facies of the upper mantle
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批准号:5190214
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项目类别:Research Grants
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资助金额:$0.0万
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财政年份:1999
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负责人:Professor Dr. Alan Butler Woodland
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依托单位:
Characterizing the fluid films surrounding inclusions in lithospheric diamond: further clues to the environment of diamond formation
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批准号:538678688
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项目类别:Research Grants
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资助金额:$0.0万
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财政年份:--
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负责人:Professor Dr. Alan Butler Woodland
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依托单位:
海外基金