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首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >Magnetic fabric of the Barrington Passage pluton, Meguma Terrane, Nova Scotia: a two-stage fabric history of syntectonic emplacement
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Magnetic fabric of the Barrington Passage pluton, Meguma Terrane, Nova Scotia: a two-stage fabric history of syntectonic emplacement

机译：新斯科舍省Meguma Terrane的Barrington Passage直子的磁性织物：对角线构造的两阶段织物历史

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摘要

Structural analysis and the anisotropy of magnetic susceptibility (AMS) are used to document the internal, magmatic to high-temperature subsolidus fabrics of the tonalitic Late Devonian Barrington Passage pluton. The AMS fabric orientations compare favorably with mesoscopic-scale fabrics. In general, the K_1-K_2 principal plane of the AMS is close to the observed mineral foliation defined by biotite and plagioclase, and the K_1 axis is aligned parallel to a mineral lineation defined by the same minerals, and to a locally developed, weak extension lineation defined by quartz. Measurement of the anisotropy of anhysteretic remanence (AAR), and image analysis of biotite preferred orientations confirm that the orientation of the AMS is principally controlled by biotite. Locally anomalous AMS orientations are attributed to the influence of fine-grained magnetite crystals, the presence of which is revealed by measurements of hysteresis and coercivity properties. A two-stage fabric history is revealed. First, horizontal fabrics were formed (foliation, compositional banding) during emplacement of a laccolith-like pluton. The second stage involved synmagmatic folding of the horizontal foliation and banding in response to regional contraction associated with the Acadian Orogeny, with development of a lineation that records stretching parallel to the fold axis. The results demonstrate that the Barrington Passage pluton was emplaced during the main phase of the Acadian Orogeny. A model is proposed that depicts the Barrington Passage pluton as the folded base of a larger syntectonic pluton, that is now largely eroded off.
机译：使用结构分析和磁化率各向异性（AMS）记录了晚新生代泥盆纪Barrington通道岩体的内部，岩浆到高温的亚固相织物。 AMS织物取向与介观规模的织物相比具有优势。通常，AMS的K_1-K_2主平面接近由黑云母和斜长石定义的观察到的矿物叶面，并且K_1轴平行于由相同矿物定义的矿物线，并且与局部发育的弱延伸对齐石英定义的线条。滞后剩磁（AAR）各向异性的测量以及黑云母优选取向的图像分析证实，AMS的取向主要受黑云母控制。局部异常的AMS取向归因于细晶粒磁铁矿晶体的影响，通过测量磁滞和矫顽力特性可以揭示其存在。揭示了两阶段的织物历史。首先，在放置类似漆石的岩钉的过程中形成了水平织物（叶状，组成带）。第二阶段涉及响应与Acadian造山带相关的区域收缩而对水平叶和带的岩性折叠，并发展出一条记录平行于折叠轴的伸展线。结果表明，在Acadian造山运动的主要阶段，Barrington通道岩体就位。提出了一个模型，该模型将Barrington通道岩体描述为较大的构造岩体的折叠基础，现在该岩体已被大量侵蚀。

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