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首页> 外文期刊>Contributions to Mineralogy and Petrology >Steep schlieren and associated enclaves in the Vinalhaven granite, Maine: possible indicators for granite rheology
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Steep schlieren and associated enclaves in the Vinalhaven granite, Maine: possible indicators for granite rheology

机译：缅因州Vinalhaven花岗岩中陡峭的schlieren及其相关飞地：花岗岩流变学的可能指标

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摘要

Schlieren that form above the solidus are potentially diagnostic of the rheology of crystallizing granitic magmas and could provide insights into magma chamber structure. Here we focus on steep schlieren associated with comagmatic enclaves in the Vinalhaven granite. Steep schlieren extend 1–3 m upward from the sides of enclaves and appear to have steep cylindrical shapes in 3D. Analyses of schlieren widths and the sizes of associated enclaves suggest that granitic crystal mush in which they occur had a plastic rheology probably characterized by a yield strength. The enclaves, now enclosed in coarse-grained granite, must have existed at higher levels in a crystal-poor part of a magma chamber and settled downward until reaching material with a yield strength exceeding the buoyancy of the enclaves. In addition to constraining the local rheology of the granite, their relative positions may indicate vertical rheological variations and possibly the chamber floor.
机译：固相线上方形成的Schlieren可能对结晶花岗岩岩浆的流变性进行诊断，并可能提供岩浆室结构的见识。在这里，我们重点研究与Vinalhaven花岗岩中的岩浆飞地相关的陡峭的裂纹岩。陡峭的鹅卵石从飞地的侧面向上延伸1-3 m，并且在3D模式下呈现出陡峭的圆柱形状。对纹影宽度和相关飞地的大小的分析表明，发生它们的花岗岩晶体糊状物具有可能以屈服强度为特征的塑性流变学。现在，包围在粗粒花岗岩中的围场必须存在于岩浆室中晶体贫乏的部分中较高的位置，并且必须向下沉降，直到达到屈服强度超过围场浮力的材料为止。除了限制花岗岩的局部流变性外，它们的相对位置还可能指示出垂直的流变变化，也可能表明腔室底部。

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  • 来源
    《Contributions to Mineralogy and Petrology》 |2007年第2期|121-138|共18页
  • 作者

    R. A. Wiebe; M. Jellinek; M. J. Markley; D. P. Hawkins; D. Snyder;

  • 作者单位

    Department of Earth and Environment Franklin and Marshall College Lancaster PA 17603 USA;

    Department of Earth and Ocean Sciences The University of British Columbia 6339 Stores Road Vancouver BC Canada V6T 1Z4;

    Department of Earth and Environment Mount Holyoke College 50 College Street South Hadley MA 01075 USA;

    Department of Geosciences Denison University Granville OH 43023 USA;

    RAND Corporation 1776 Main Street P.O. Box 2138 Santa Monica CA 90407 USA;

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