Magnetofabric and textural analysis from highly anisotropic magnetite bearing shear zones in metamorphic nappes of the Scandinavian Caledonides

斯堪的纳维亚喀里多尼亚变质推覆体中高度各向异性磁铁矿剪切带的磁织物和结构分析

基本信息

项目摘要

The first documentation of very high anisotropies (P´ > 4) of the magnetic susceptibility in metamorphic nappes from the Scandinavian Caledonides raises questions about the causative processes. Magnetite in a platy shape was identified as the main carrier of the magnetic susceptibility and the main reason for these high degrees of anisotropy. A major question is whether these extremely flattened magnetite grains are controlled by mimetic growth, ductile deformation, or both. Since ductile deformation can influence the grain shape of magnetite and thus the extrinsic susceptibility the AMS can be linked with ductile deformation processes. This is in marked contrast to paramagnetic minerals, which will attain fabric saturation at very high strain and are thus suitable for quantification of low to moderate strain. The exhumation of high-grade metamorphic rocks is commonly accompanied by ductile shearing localized in zones of various dimensions, geometries, lithologies, p-T-conditions and activity periods. Total strain is expected to be high in major shear zones within high-grade metamorphic nappes, but difficult to quantify. The study of shear zones with very high anisotropies of the magnetic susceptibility provides a chance to monitor systematic changes of rock magnetic parameters and petrofabrics – quantified by low- and high-field AMS, IRM, and AARM – and to link them with field observations, meso- to microscale structural data, textural data, magnetomineralogy (SEM, EMP), and image analysis. For the reintegration of the results into the geological realm a few 40Ar/39Ar-datings of recrystallized, synkinematic white micas are considered.
斯堪的纳维亚卡利多尼德变质推覆体中磁化率的高各向异性(P´b> 4)的首次文献提出了有关其成因过程的问题。板状磁铁矿是磁化率的主要载体,也是造成这些高各向异性的主要原因。一个主要的问题是,这些极其扁平的磁铁矿颗粒是由模拟生长、韧性变形还是两者共同控制的。由于韧性变形会影响磁铁矿的晶粒形状,从而影响磁铁矿的外在磁化率,因此可以将AMS与韧性变形过程联系起来。这与顺磁性矿物形成鲜明对比,顺磁性矿物将在非常高的应变下达到织物饱和,因此适合于低至中等应变的量化。高品位变质岩的发掘通常伴随着韧性剪切作用,这些韧性剪切作用在不同的尺度、几何形状、岩性、p- t条件和活动时期都具有局限性。预计在高变质推覆体的主要剪切带中总应变较高,但难以量化。对磁化率各向异性非常高的剪切带的研究提供了一个机会,可以监测岩石磁性参数和岩石组构的系统变化(通过低场和高场AMS、IRM和AARM进行量化),并将它们与现场观测、中观到微观结构数据、纹理数据、磁矿学(SEM、EMP)和图像分析联系起来。为了将结果重新整合到地质领域,考虑了一些40Ar/ 39ar的重结晶,同动的白色云母定年。

项目成果

期刊论文数量(2)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Magnetic fabric development in a highly anisotropic magnetite-bearing ductile shear zone (Seve Nappe Complex, Scandinavian Caledonides)
高度各向异性含磁铁矿的延性剪切带中磁性织物的发展(斯堪的纳维亚喀里多尼德斯的 Seve Nappe 复合体)
Process of magnetite fabric development during granite deformation
花岗岩变形过程中磁铁矿组构的发育过程
  • DOI:
    10.1016/j.epsl.2011.05.033
  • 发表时间:
    2011
  • 期刊:
  • 影响因子:
    5.3
  • 作者:
    Mamtani;Piazolo;Greiling;Kontny;Hrouda
  • 通讯作者:
    Hrouda
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Privatdozentin Dr. Agnes Kontny其他文献

Privatdozentin Dr. Agnes Kontny的其他文献

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{{ truncateString('Privatdozentin Dr. Agnes Kontny', 18)}}的其他基金

Magnetic fatigue of magnetite: effect of cyclic loading on the magnetic and microstructural behavior at elevated temperatures
磁铁矿的磁疲劳:循环载荷对高温下磁性和微观结构行为的影响
  • 批准号:
    329643415
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Mineral magnetism of shocked ferrimagnetic minerals
冲击亚铁磁性矿物的矿物磁性
  • 批准号:
    236619798
  • 财政年份:
    2013
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Rock magnetic properties and their anisotropy from the Outokumpu assemblage in the Outokumpu deep drilling, Finland
芬兰奥托昆普深钻奥托昆普组合的岩石磁特性及其各向异性
  • 批准号:
    65103356
  • 财政年份:
    2008
  • 资助金额:
    --
  • 项目类别:
    Infrastructure Priority Programmes
Rock magnetic properties and their anisotropy from host rock and impact lithologies of drillings at the Chesapeake Bay impact structure, USA
美国切萨皮克湾冲击构造钻探的母岩和冲击岩性的岩石磁特性及其各向异性
  • 批准号:
    65021913
  • 财政年份:
    2008
  • 资助金额:
    --
  • 项目类别:
    Infrastructure Priority Programmes
Magnetic mineralogy and rock magnetic properties of impact lithologies of the Bosumtwi crater drilling project, Ghana
加纳Bosumtwi陨石坑钻探项目的磁矿物学和冲击岩性岩石磁特性
  • 批准号:
    5447188
  • 财政年份:
    2005
  • 资助金额:
    --
  • 项目类别:
    Infrastructure Priority Programmes
Hot-spot related crustal magnetization and magnetic petrology from scientific drillings
来自科学钻探的与热点相关的地壳磁化和磁性岩石学
  • 批准号:
    5447228
  • 财政年份:
    2005
  • 资助金额:
    --
  • 项目类别:
    Infrastructure Priority Programmes
Magneto-mineralogical beharvoir and magnetic fabric of lava in relation to extrusion conditions during growth of the Hawaiian shield volcano (HSDP-drilling)
夏威夷盾状火山生长过程中与挤压条件相关的熔岩磁矿物学行为和磁性结构(HSDP-钻孔)
  • 批准号:
    5238968
  • 财政年份:
    2000
  • 资助金额:
    --
  • 项目类别:
    Infrastructure Priority Programmes
Arctic Volcanism in Woodfjorden: Fundamental magneto-mineralogical data for magnetic modeling and estimation of emplacement conditions of Quaternary volcanic rocks
伍德峡湾的北极火山活动:用于第四纪火山岩磁模拟和侵位条件估计的基本磁矿物学数据
  • 批准号:
    530455879
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Impact structures: Effect of post-shock thermal conditions on mineral magnetism
撞击结构:震后热条件对矿物磁性的影响
  • 批准号:
    432762445
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Emplacement conditions of pyroclastic deposits inferred from magnetic properties of the Eger maar-diatreme (ICDP-EGER drill site S4) and Eifel volcanoes
根据 Eger maar-diatreme(ICDP-EGER 钻探场 S4)和埃菲尔火山的磁性推断的火山碎屑矿床的侵位条件
  • 批准号:
    517885783
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Infrastructure Priority Programmes

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