Understanding the crust-mantle transition from fast-spreading mid-ocean ridges: experiments and analytical studies using ICDP OmanDP drill core samples
了解快速扩张的大洋中脊的壳幔转变:使用 ICDP OmanDP 钻芯样本进行实验和分析研究
基本信息
- 批准号:439183043
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Infrastructure Priority Programmes
- 财政年份:
- 资助国家:德国
- 起止时间:
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
In winter 2017/18, the ICDP drilling initiative "Oman Drilling Project" (OmanDP) successfully penetrated the paleo-crust-mantle transition of the Oman ophiolite, which is regarded as the world’s largest, best-exposed, and most-studied section of subaerially exposed oceanic lithosphere. The cores are 400 m (CM1) and 300 m (CM2) long and were recovered with a nearly 100 % success rate, making them a uniquely valuable resource for petrographical, petrological, and geochemical study and ensuring access to coherent sections throughout the enigmatic transition between the uppermost mantle and the lowermost crust of fast-spreading ridge systems. The drilled transects through the crust-mantle transition of the Oman paleo-crust, provide coherent long sections of the lowermost layered gabbros, massive dunites, troctolites, and wehrlites without any gaps, and can be regarded as a Rosetta Stone for understanding the magmatic processes and the mode of deep crustal accretion, in a depth window that was not accessible in recent oceans so far. The proposed project focuses on several scientific targets following two different methodological approaches: (1) In an experimental study we aim to simulate equilibrium and fractional crystallization in a parental MORB-type system relevant for a setting of initiation of a subduction zone at the transition between "dry" (like East Pacific Rise) and "wet" conditions (Izu-Bonin-Mariana arc-type crust). In a subproject we aim to quantify the trace element distribution between spinel/chromite and MORB melt. (2) The second approach focus on petrological and geochemical investigations on the rocks from the CM1 and CM2 drill cores in order to clarify the mechanism of massive dunite formation in the crust-mantle transition, and establish the exact mode of differentiation/fractionation within the lowermost crust. The results of both complementary approaches will provide a basis for a deep understanding of the magmatic processes at the base of fast-spreading crust in an environment of initial subduction, and will provide fundamental knowledge about the geodynamics of accretion of fast-spreading oceanic crust.
2017/18年冬季,ICDP钻井倡议“阿曼钻井项目”(OmanDP)成功穿透了阿曼蛇绿岩的古壳幔转换,该蛇绿岩被认为是世界上最大、暴露程度最高、研究最多的海底暴露海洋岩石圈剖面。岩心长400米(CM2)和300米(CM2),恢复成功率接近100%,使其成为岩石学,岩石学和地球化学研究的独特宝贵资源,并确保在快速扩张脊系统的最上地幔和最下地壳之间的神秘过渡中获得相干剖面。钻取的阿曼古地壳壳幔过渡剖面,提供了最下层辉长岩、块状泥质岩屑、浮长岩和岩屑的连贯长剖面,没有任何间隙,可以被视为了解岩浆过程和深部地壳吸聚模式的罗塞塔石碑,其深度窗口是迄今为止在近代海洋中无法获得的。拟议的项目侧重于遵循两种不同的方法方法的几个科学目标:(1)在一项实验研究中,我们的目标是模拟与“干”(如东太平洋隆起)和“湿”条件(伊豆-波宁-马里亚纳弧型地壳)之间过渡的俯冲带起始设置相关的母morb型系统中的平衡和分离结晶。在子项目中,我们的目标是量化尖晶石/铬铁矿和MORB熔体之间的微量元素分布。(2)二是通过对CM1和CM2岩心岩石的岩石学和地球化学研究,明确壳幔转变过程中块状白云岩的形成机制,建立最下层地壳分异/分异的精确模式。这两种互补方法的结果将为深入理解初始俯冲环境下快速扩张地壳底部的岩浆过程提供基础,并为快速扩张海洋地壳增生的地球动力学提供基础知识。
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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Dr. Carl-Dieter Garbe-Schönberg其他文献
Dr. Carl-Dieter Garbe-Schönberg的其他文献
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{{ truncateString('Dr. Carl-Dieter Garbe-Schönberg', 18)}}的其他基金
Trans-European ash plumes from the largest explosive volcanic eruptions: A tephra record from the East European Plain
最大的火山喷发产生的横贯欧洲的火山灰羽流:来自东欧平原的火山灰记录
- 批准号:
429662378 - 财政年份:2020
- 资助金额:
-- - 项目类别:
Research Grants
Understanding axial melt lens dynamics and lower crust accretion at fast-spreading mid-ocean ridges: new insights from drill cores obtained by the ICDP Oman Drilling Project
了解快速扩张的洋中脊的轴向熔融透镜体动力学和下地壳增生:ICDP阿曼钻探项目获得的钻芯新见解
- 批准号:
398945252 - 财政年份:2018
- 资助金额:
-- - 项目类别:
Infrastructure Priority Programmes
Long in-situ sections in the Wadi Gideah, Oman ophiolite: The key for understanding the mechanism of accretion, magmatic evolution and cooling of lower fast-spread oceanic crust
阿曼蛇绿岩 Wadi Gideah 的长原位剖面:了解下部快速扩张洋壳的增生、岩浆演化和冷却机制的关键
- 批准号:
270849521 - 财政年份:2015
- 资助金额:
-- - 项目类别:
Infrastructure Priority Programmes
Establishing a reference profile for fast-spreading oceanic crust: Petrology and geochemistry of the "Wadi Gideah" cross section in the Oman ophiolite
为快速扩张的洋壳建立参考剖面:阿曼蛇绿岩“Wadi Gideah”横截面的岩石学和地球化学
- 批准号:
214851514 - 财政年份:2012
- 资助金额:
-- - 项目类别:
Infrastructure Priority Programmes
Coral-based reconstruction of sub- to interdecadal climate variability in the Western Atlantic Warm Pool and the link to past hurricane activity
基于珊瑚的西大西洋暖池亚到年代际气候变化的重建以及与过去飓风活动的联系
- 批准号:
220278536 - 财政年份:2012
- 资助金额:
-- - 项目类别:
Research Grants
Lithiumisotope und Wassergehalte als Tracer für die Entstehung der Mantelreservoire von ozeanischen Intraplattenbasalten
锂同位素和水含量作为大洋板内玄武岩地幔储层形成的示踪剂
- 批准号:
21645268 - 财政年份:2006
- 资助金额:
-- - 项目类别:
Research Grants
Hydrothermal Fluids at the Mid-Atlantic Ridge (15°N and 4-11°S) as Media for the Transport of Energy and Mass from the Crust into the Hydro- and Biosphere
大西洋中脊(北纬 15°和南纬 4-11°)的热液作为能量和质量从地壳传输到水文圈和生物圈的媒介
- 批准号:
5417497 - 财政年份:2003
- 资助金额:
-- - 项目类别:
Priority Programmes
Mineralogische, geochemische und biologische Untersuchungen an Hydrothermalsystemen des Mittelatlantischen Rückens zwischen 14°45`N und 15°05`N (Forschungsantrag M 60/3)
对北纬 14°45 至 15°05 之间的大西洋中脊热液系统进行矿物学、地球化学和生物学研究(研究提案 M 60/3)
- 批准号:
5416127 - 财政年份:2003
- 资助金额:
-- - 项目类别:
Priority Programmes
Coral reefs on the tin island of Belitung: ‘reefs of hope’ threatened by pollution and runoff (TINBELT)
勿里洞锡岛上的珊瑚礁:“希望之礁”受到污染和径流的威胁 (TINBELT)
- 批准号:
468545728 - 财政年份:
- 资助金额:
-- - 项目类别:
Priority Programmes
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