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首页> 外文期刊>Journal of Asian earth sciences >Macrostructures vs microstructures in evaporite detachments: An example from the Salt Range, Pakistan
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Macrostructures vs microstructures in evaporite detachments: An example from the Salt Range, Pakistan

机译：蒸发岩分离中的宏观结构与微观结构：以巴基斯坦盐岩山脉为例

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摘要

The Salt Range, Pakistan is the surface expression of an evaporite detachment over which the Potwar Plateau fold-thrust belt has moved. Whilst previous publications regarding this region have focused on the petroleum prospectivity, deformation, and large-scale processes, this paper characterises the Salt Range detachment at the meso-(10 cm to 10s of metres) and micro-scale (cm to mu m) and examines correlations to the macro-scale (105 of metres to kms). Two detailed scaled cross sections are analysed alongside structural measurements to characterise the detachment at the mesa-scale with optical analysis of microstructures that formed during deformation characterising the micro-scale. Both ductile and brittle features observed in cross section indicate composite deformation processes acting simultaneously; this contrasts with models of salt detachments behaving homogeneously. Microstructural analysis indicates processes of grain boundary migration and crystal lattice distortions. The microstructurally revealed competition between intra-crystalline deformation and recrystallization at shallow depths and low temperatures links passes up-scale to mesoscale evaporite mylonites and progressively in the weaker units, whereas more brittle processes operate in the stronger lithologies in this near-unique outcrop of a the emergent toe of a major salt-bearing detachment fault. (C) 2015 Elsevier Ltd. All rights reserved.
机译：巴基斯坦萨尔特山脉（Salt Range）是蒸发岩脱离的表面表现，波塔瓦高原褶皱冲断带已在该蒸发岩上移动。尽管先前有关该地区的出版物都集中在石油的前景，变形和大规模过程上，但本文还是以中尺度（10 cm至10s米）和微观尺度（cm至μm）表征了盐范围的分离。并检查与宏观尺度（105米至千米）的相关性。对两个详细的按比例缩放的横截面以及结构测量值进行了分析，以对台面规模的分离进行表征，并对在变形过程中形成的微观结构进行了光学分析，从而表征了微观规模。在横截面上观察到的韧性和脆性特征都表明复合变形过程同时起作用。这与均质行为的盐分分离模型形成对比。显微组织分析表明晶界迁移和晶格畸变的过程。微观结构揭示了在浅深度和低温连接处晶体内形变与再结晶之间的竞争，从上到中尺度的蒸发岩棉岩，并在较弱的单元中逐渐发展，而在这种近乎唯一的露头露头中，较脆的过程以较强的岩性作用。重大的含盐脱离断层的出现脚趾。 （C）2015 Elsevier Ltd.保留所有权利。

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  • 来源
    《Journal of Asian earth sciences》 |2015年第2期|922-934|共13页
  • 作者

    Richards L.; King R. C.; Collins A. S.; Sayab M.; Khan M. A.; Haneef M.; Morley C. K.; Warren J.;

  • 作者单位

    Univ Adelaide, Ctr Tecton Resources & Explorat TRaX, Dept Earth Sci, Adelaide, SA 5005, Australia;

    Univ Adelaide, Ctr Tecton Resources & Explorat TRaX, Dept Earth Sci, Adelaide, SA 5005, Australia;

    Univ Adelaide, Ctr Tecton Resources & Explorat TRaX, Dept Earth Sci, Adelaide, SA 5005, Australia;

    Geol Survey Finland, FI-02151 Espoo, Finland;

    Karakoram Int Univ, Gilgit, Gilgit Baltista, Pakistan;

    Univ Peshawar, Dept Geol, Khyber Pakhtunkhwa, Pakistan;

    PTTEP, Bangkok 10900, Thailand;

    Chulalongkorn Univ, Chevron PTTEP Int Master Program Petr Geosci, Dept Geol, Fac Sci, Bangkok 10300, Thailand;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Salt Range; Pakistan; Evaporite detachment; Microstructures; Fold-thrust belt;

    机译：盐范围巴基斯坦蒸发岩脱离微观结构冲断带;

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