Estimating complete dyke dimensions from partial exposures

IF 2.6 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Structural Geology Pub Date : 2025-02-04 DOI:10.1016/j.jsg.2025.105350

Sirshendu Kumar Biswas , Tridib Kumar Mondal , Avijit Saha , Alaap Kumar Mukhopadhyay , Archishman Mukherjee

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Abstract

Knowledge of complete dyke dimensions is crucial to determine the actual aspect ratio which is indispensable in estimating their magma overpressure, depth of origin and even explosivity potential of fissure eruptions. A dearth of completely exposed dykes imposes considerable uncertainty on estimates of their aspect ratios. Therefore, we have pioneered a method of estimating complete dyke dimensions from their partial exposures lacking any tip. Considering dykes as dominantly opening mode fractures, the method is built upon the idealized canonical model of opening mode fractures and utilizes differential equation of ellipse, which is the predicted shape of fracture opening in the model, to estimate their full length, maximum width and aspect ratio from limited outcrop measurements. The validity of the method has been tested against ground data and published data. From its application to two partially exposed mafic dykes devoid of tips, one each from the Western and Eastern Dharwar Cratons of India we generated results from which we further calculate their magma overpressures and depths of origin. Although developed for dykes, the method has potential for wider application, since it can be used fundamentally to predict complete dimensions of any elliptical shaped natural features from their partial exposures.

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从部分暴露估计堤防的完整尺寸

完整的岩脉尺寸对于确定实际宽高比至关重要，这对于估计岩浆超压、成因深度甚至裂缝喷发的爆炸性潜力都是必不可少的。由于缺乏完全暴露的堤坝，对其纵横比的估计存在相当大的不确定性。因此，我们开创了一种方法，估计完整的堤防尺寸从他们的部分暴露缺乏任何尖端。该方法考虑岩脉以张开型裂缝为主，以张开型裂缝的理想典型模型为基础，利用模型中预测裂缝张开形状的椭圆微分方程，从有限的露头测量中估计出岩脉的全长、最大宽度和长径比。该方法的有效性已通过地面数据和公开数据进行了验证。将其应用于印度达尔瓦克拉通东、西两个部分裸露无尖端的基性岩脉，得到了相应的结果，并进一步计算了它们的岩浆超压和成因深度。虽然该方法是为堤坝开发的，但它有更广泛的应用潜力，因为它可以从部分暴露中预测任何椭圆形自然特征的完整尺寸。

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来源期刊

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.