首页> 外文学位 >Petrologic studies of process interactions in metamorphic systems: Deformation and metamorphism in the Selkirk Allochthon orogenic wedge; and feedback mechanisms during reactive fluid flow (British Columbia).

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Petrologic studies of process interactions in metamorphic systems: Deformation and metamorphism in the Selkirk Allochthon orogenic wedge; and feedback mechanisms during reactive fluid flow (British Columbia).

机译：变质系统中过程相互作用的岩石学研究：Selkirk Allochthon造山楔中的变形和变质作用；反应流体流动过程中的反馈和反馈机制（不列颠哥伦比亚省）。

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The first part of this thesis focuses on the tectono-metamorphic evolution of the Selkirk Allochthon, a welt of supracrusal rocks deformed and metamorphosed during Mesozoic to early Cenozoic time as a result of terrane collision at the western edge of North America. The studied area is part of the Selkirk Allochthon. Pelitic rocks in the area record a Barrovian metamorphic field gradient. Detailed mapping of metamorphic assemblage distribution and textural analysis of pelitic rocks has unraveled two distinct metamorphic events (M1 and M2). Emplacement of the Bigmouth Creek stock, which intrudes rocks of the Big Fish Creek area was dated as mid-Jurassic, with evidence for substantial reheating in early Cretaceous time. Based on regional correlation, M1 is assigned a mid-Jurassic age, synchronous with emplacement of the Bigmouth Creek stock. M2 is interpreted to have resulted from the early Cretaceous thermal event. The development of early-M2 kyanite and late-M2 andalusite indicates decompression over at least 3 kbar, implying at least 10 km of denudation. Detailed analysis of structural elements suggests that the area was part of a long-lived, mid-crustal zone of intense distributed strain. Uplift and denudation of metamorphic rocks by tectonic extension and coaxial thinning were synchronous with continued contraction. A tectono-thermal model is proposed for the Allochthon as a long-lived, dynamic orogenic wedge within which deformation accommodated contraction due to terrane convergence and accretion, and polycyclic metamorphism resulted from thickening and maintenance of the wedge over at least 20 My. Significant early Cretaceous thinning of the wedge recorded by extensional strain and late-M2 decompression resulted from waning of far-field contraction, and/or from rheological modification of the wedge due to thermal relaxation.; The second part of this thesis reports on a study of heterogeneous reactive transport of H₂O-CO₂ fluids during contact metamorphism of siliceous dolomites. Comparison of mineral assemblage distributions resulting from numerical simulations of heterogeneous flow with assemblage distribution in the Alta (Utah) contact aureole indicates that mineral reactions record flow through highly heterogeneous permeability. This is interpreted to result from positive feedback between reaction enhancement of permeability and flow-focusing. Comparison with other contact aureoles suggests that this is a common mechanism of permeability evolution during contact metamorphism of carbonate rocks. More homogeneous permeability recorded in regional metamorphic rocks may reflect fundamental differences in the relative rates of fluid flow and compaction in regional and contact metamorphic environments.

机译：本论文的第一部分着眼于塞尔基克异地带的构造-变质演化，这是由于中西部地区的地层碰撞而在中生代至新生代早期变形并变质的上界岩石的熔体。研究区域是Selkirk Allochthon的一部分。该地区的泥质岩记录了Barrovian变质场梯度。变质组合分布的详细映射和胶质岩的纹理分析揭示了两个不同的变质事件（M1和M2）。侵入大鱼溪地区岩石的比格茅斯溪水库的进驻年代为侏罗纪中期，有证据表明白垩纪早期大量回暖。根据区域相关性，将M1分配为侏罗纪中期，并与Bigmouth Creek种群的安置同步。 M2被认为是白垩纪早期热事件的结果。 M2早期的蓝晶石和M2晚期的红柱石的发育表明至少在3 kbar上减压，这意味着至少10 km的剥蚀作用。对结构元素的详细分析表明，该区域是高强度分布应变的长寿命，中地壳区域的一部分。构造伸展和同轴变薄作用对变质岩的抬升剥蚀与持续收缩是同步的。为Allochthon提出了构造-热模型，该模型是一种长寿的动态造山楔，其中变形适应了由于地形收敛和积聚而产生的收缩，并且由于楔的增厚和维持至少20 My而产生了多环变质作用。远期收缩的减弱和/或由于热弛豫引起的楔的流变学改变，导致拉伸应变和M2晚期减压记录到楔的白垩纪早期明显变薄。本文的第二部分报道了硅质白云岩接触变质过程中H _{2 O-CO _{2 流体的非均相反应输运研究。由非均质流的数值模拟得到的矿物组合分布与阿尔塔（犹他州）接触极的组合分布的比较表明，矿物反应记录了通过高度非均质渗透率的流动。这被解释为是由渗透率反应增强和流动聚焦之间的正反馈引起的。与其他接触性金相的比较表明，这是碳酸盐岩接触变质过程中渗透性演化的常见机制。区域变质岩中记录的更均匀的渗透率可能反映了区域和接触变质环境中流体流动和压实相对速率的根本差异。}}

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作者
Marchildon, Marie-France Nathalie.;
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作者单位

The University of British Columbia (Canada).;

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授予单位 The University of British Columbia (Canada).;
学科 Geology.
学位 Ph.D.
年度 2000
页码 169 p.
总页数 169
原文格式 PDF
正文语种 eng
中图分类地质学;
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Petrologic studies of process interactions in metamorphic systems: Deformation and metamorphism in the Selkirk Allochthon orogenic wedge; and feedback mechanisms during reactive fluid flow (British Columbia).

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