RUI: Fabric in Granite: the Vinalhaven and Cadillac Mountain Intrusive Complexes, Maine
RUI:花岗岩织物:维纳尔黑文和凯迪拉克山侵入岩综合体,缅因州
基本信息
- 批准号:0229269
- 负责人:
- 金额:$ 10.96万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2003
- 资助国家:美国
- 起止时间:2003-01-01 至 2006-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Granitoid plutons constitute much of the earth's crust, and most show magmatic foliation and lineation (i.e. fabric). Although structural geologists have made great strides in quantifying magmatic fabric and interpreting its significance in the context of pluton emplacement, problems remain in using fabric to understand tectonic and magmatic processes, identifying fabric overprinting or modification, and integrating different scales of observation. Does fabric form during magma chamber processes such as deposition of crystal mush on the magma chamber floor, during tectonic processes such as deformation in an active shear zone, or as a composite record of multiple events? Although many processes probably contribute to fabric formation in granites, and the mechanisms by which fabric forms in one pluton may be different from those in another, few widely accepted criteria exist for testing the different models of fabric formation against one another. This project integrates structural and petrological methods in order to testhypotheses about fabric formation in and emplacement of two shallow Silurian plutons in coastal Maine: the Cadillac Mountain and Vinalhaven Intrusive Complexes. Both plutons show quantifiable variations in magmatic fabric, and neither shows evidence for solid-state deformation. In addition to developing new methods for quantifying magmatic fabric in granite, this proposal takes a hypothesis-testing approach to interpreting the origins of fabric. It also supports research by six undergraduate women in a field in which they are under-represented. The research goals are three-fold:Goal 1: Test models for fabric development and modification by quantifying outcrop-scale gradients in granite fabric, texture, and composition. Working on mutually orthogonal faces of large, oriented hand samples of granite, the PI's will use a state-of-the-art fabric analysis technique to quantify the strength and symmetry of fabric defined by each mineral population. They will also use a petrological technique that has never been integrated into a structural study: qualitative assessment of the relative volumes of cumulus crystals and melt present during fabric development. The focus is on gradients in three settings: (a) granite that is associated with a preserved magma chamber floor because it is interlayered with mafic sheets, (b) typical homogeneous granite, and (c) granite associated with mafic schlieren. Goal 2: Conduct pluton-scale studies of magmatic fabric in order to further constrain ourinterpretations of the origin and the significance of magmatic fabric in both plutons. Using the anisotropy of magnetic susceptibility (AMS), the PI's will map the orientations of magmatic foliation and lineation with respect to both the wall-rock contact and major boundaries between granite facies. The AMS study will be accompanied by detailed work on magnetic mineralogy and the relation of the AMS ellipsoid to rock fabric.Goal 3: Test the hypothesis that the magma chamber floor sagged during pluton emplacement. Previous work, based on mapping of polarity criteria and paleo-horizontalindicators preserved in mafic and felsic layers, has generated a testable model for theemplacement of these plutons by the downward sagging of the pluton floor. With alternating field demagnetization measurements on all cores collected for Goal #2, the PI's will use a paleomagnetic study to attempt to quantify the relative rotation of different parts of the pluton.
花岗岩类岩体构成了地壳的大部分,大多数表现为岩浆面理和线理(即组构)。尽管构造地质学家在量化岩浆组构和解释其在岩体侵位背景下的意义方面取得了很大进展,但在利用组构了解构造和岩浆过程、识别组构叠加或修改以及整合不同尺度的观察方面仍然存在问题。组构是在岩浆室过程中形成的,如在岩浆室底板上沉积晶体碎屑,在构造过程中,如在活动剪切带中变形,还是作为多个事件的综合记录?尽管花岗岩中的组构形成可能有许多过程,而且一个岩体中组构形成的机制可能与另一个不同,但很少有被广泛接受的标准来检验不同的组构形成模式。该项目整合了构造和岩石学方法,以验证缅因州沿海两个浅层志留系深成岩块的组构形成和侵位情况:卡迪拉克山脉和Vinalaven侵入杂岩。这两个深成岩块都显示出岩浆组构的可量化变化,都没有显示出固态变形的证据。除了开发新的方法来量化花岗岩中的岩浆组构之外,这个建议还采用了假设检验的方法来解释组构的起源。它还支持由6名本科生女性在她们所在的领域进行的研究。研究目标有三个:目标1:通过量化花岗岩织物、纹理和成分中露头尺度的梯度,测试织物开发和修改的模型。PI‘s将利用最先进的织物分析技术来量化由每种矿物定义的织物的强度和对称性,在花岗岩的大型定向手样的相互垂直的表面上工作。他们还将使用一种从未被整合到结构研究中的岩石学技术:对织物开发过程中存在的积云晶体和熔体的相对体积进行定性评估。重点关注三种环境中的梯度:(A)与保存下来的岩浆室底板有关的花岗岩,因为它与镁铁质片层夹层;(B)典型的均质花岗岩;以及(C)与镁铁纹石有关的花岗岩。目标2:开展深部岩浆组构的研究,以进一步限制我们对两个深部岩浆组构的起源和意义的解释。利用磁化率各向异性(AMS),PI将绘制岩浆面理和线理相对于围岩接触和花岗岩相之间主要边界的方向图。AMS研究将伴随着磁性矿物学以及AMS椭球体与岩石组构的关系的详细工作。目标3:验证岩浆室底板在岩体侵位过程中下陷的假设。以前的工作基于对保存在镁铁质和长英质岩层中的极性标准和古水平指示器的绘制,为这些深成岩的就位提供了一个可检验的模型,即通过深成岩底向下凹陷的方式。通过对目标2收集的所有岩芯进行交变磁场退磁测量,PI将使用古地磁研究来尝试量化岩体不同部分的相对旋转。
项目成果
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