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
基本信息
- 批准号:398945252
- 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:2018
- 资助国家:德国
- 起止时间:2017-12-31 至 2021-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In winter 2016/17, the ICDP drilling initiative "Oman Drilling Project" (OmanDP) successfully penetrated the lower paleocrust of the Oman ophiolite, the world’s largest, best-exposed, and most-studied section of subaerially exposed oceanic lithosphere. The cores are 400 m long and were recovered with a nearly 100 % success rate, making them a uniquely valuable resource for petrographical, petrological, geochemical and structural study and ensuring access to coherent sections throughout critical zones of a fast-spreading oceanic crust: the lowermost layered gabbros (core GT1), the layered to foliated gabbro transition (core GT2), and the gabbro/dike transition (core GT3). The drilled transects through the plutonic crust of the Oman paleocrust can be regarded as a Rosetta Stone for understanding the mode of accretion and cooling of fast-spread oceanic crust that covers about one third of our planet. The proposed project focuses on four main scientific targets: (1) exploring of axial melt lens dynamics at the gabbro/dike transition, (2) investigating the nature of the transition between layered and foliated gabbro in the mid-crust (3) understanding the mechanisms of layer-forming processes in the deep, layered crust, and (4) testing the hypothesis that amphibole-bearing patches/veins formed in the magmatic-metamorphic regime are the results of initial cooling of the deep crust. We plan to integrate petrographical, petrological, geochemical and micro-structural work (lattice preferred orientation using electron backscattering diffraction) on layered, foliated and varitextured gabbros. The results will establish the basis for a deep understanding of the magmatic and initial hydrothermal processes within the axial melt lens and surrounding crystal mush, which form the magma chambers at the end of the melting column beneath mid-ocean ridges.
2016/17年冬季,ICDP钻井项目“阿曼钻井项目”(OmanDP)成功穿透了阿曼蛇绿岩的下古地壳,这是世界上最大、暴露程度最高、研究最多的海底暴露海洋岩石圈部分。岩心长400米,恢复成功率接近100%,使其成为岩石学,岩石学,地球化学和构造研究的独特宝贵资源,并确保在快速扩张的海洋地壳的关键区域:最底部的层状辉长岩(岩心GT1),层状到片理辉长岩过渡(岩心GT2)和辉长岩/岩脉过渡(岩心GT3)中获得连贯剖面。钻穿阿曼古地壳深部地壳的横断面可以被视为了解覆盖地球约三分之一的快速扩张的海洋地壳的吸积和冷却模式的罗塞塔石碑。该项目主要有四个主要的科学目标:(1)探索辉长岩/岩脉过渡的轴向熔融透镜动力学;(2)研究中地壳层状辉长岩与片理辉长岩过渡的性质;(3)了解深层层状地壳的成层过程机制;(4)验证岩浆变质体系中形成的含角闪岩斑块/脉是深部地壳初始冷却的结果。我们计划将岩相学、岩石学、地球化学和微结构工作(利用电子后向散射衍射的晶格优选方向)整合到层状、片理和变质辉长岩中。这些结果将为深入了解岩浆和初始热液过程在轴向熔融透镜和周围的晶体糊内建立基础,这些晶体糊形成了中洋脊下熔融柱末端的岩浆房。
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
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
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- 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
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
- 批准号:
439183043 - 财政年份:
- 资助金额:
-- - 项目类别:
Infrastructure Priority Programmes
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