对阿福图纳达矿脉片麻岩穹丘的岩石结构和拉曼微光谱研究:绘制热梯度图

IF 2.6 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Structural Geology Pub Date : 2024-08-20 DOI:10.1016/j.jsg.2024.105236
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引用次数: 0

摘要

通过对石英和石墨岩性分析以及石墨化碳质材料的拉曼微谱分析,对来自阿福图纳达穹顶的黑色石英岩和偏闪长岩进行了分析。研究结果使我们认识到,变形温度从穹顶外围向其核心升高,标志着石英晶内滑移系统从基底-<a>到菱形-<a>的过渡,最大温度为 475 °C,从菱形-<a>到棱形-<a>的过渡,最大温度为 515 °C。对大型石墨晶粒的拉曼研究显示,石墨晶粒中的结晶组织并非随机的,核心区域的晶格结构阶序较弱(反映较低的形成温度),而边缘的结晶度较高(形成温度较高)。这一发现可能反映了级变质过程中的屏蔽效应,边缘物质阻止了晶核物质的重组和结晶度的提高。这项研究还表明,石墨是变质富有机岩石中压力-温度-时间路径重建的良好候选材料。
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Petrofabric and Raman microspectroscopy study of the Mina Afortunada gneiss dome: Mapping its thermal gradient

Black quartzites and migmatitic orthogneisses from the Mina Afortunada dome have been analysed through quartz and graphite petrofabric analysis and Raman microspectrometry on graphitized carbonaceous material. The results permit us to recognize a deformation temperature increase from the dome envelope towards its core marking the transition from basal-<a> to rhomb-<a> quartz intracrystalline slip systems at maximum T of 475 °C, and from rhomb-<a> to prism-<a> at maximum T of 515 °C. The complementary petrofabric and Raman study on graphite discloses a change from basal to prismatic <a> slip systems at maximum T of ca. 470 °C, accompanied by a strengthening of its structural order.

The Raman study of large graphite grains revealed a non-random crystallinity organization in them, with domains of weaker lattice structural order (reflecting lower formation T) in core areas and higher crystallinity sectors (higher formation T) at the rims. This finding might reflect a shielding effect during prograde metamorphism, the rim material preventing grain core material from reorganization and increase in its crystallinity. This study shows also that graphite can be a good candidate for pressure-temperature-time path reconstruction in metamorphosed organic-rich rocks.

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来源期刊
Journal of Structural Geology
Journal of Structural Geology 地学-地球科学综合
CiteScore
6.00
自引率
19.40%
发文量
192
审稿时长
15.7 weeks
期刊介绍: The Journal of Structural Geology publishes process-oriented investigations about structural geology using appropriate combinations of analog and digital field data, seismic reflection data, satellite-derived data, geometric analysis, kinematic analysis, laboratory experiments, computer visualizations, and analogue or numerical modelling on all scales. Contributions are encouraged to draw perspectives from rheology, rock mechanics, geophysics,metamorphism, sedimentology, petroleum geology, economic geology, geodynamics, planetary geology, tectonics and neotectonics to provide a more powerful understanding of deformation processes and systems. Given the visual nature of the discipline, supplementary materials that portray the data and analysis in 3-D or quasi 3-D manners, including the use of videos, and/or graphical abstracts can significantly strengthen the impact of contributions.
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