We present a detailed account of the structural aspects of dykes from the Chotanagpur Gneissic Complex (CGC) of eastern India, in order to understand dyke-emplacement mechanisms and magma-chamber dynamics. The study area comprises two temporally distinct parts of the CGC, namely the Proterozoic CGC and the Gondwana CGC. Dykes of the Gondwana CGC are divided into two types based on their intrusion into either sandstones or basalts. The size distributions of dyke lengths and of thicknesses respectively follow a power-law and an exponential distribution. Power law explains the nonlinear functional relationship between two quantities in which one quantity varies as the power of the other. The essential properties of power-law are that it is scale-invariant and represents the universality of a problem. An exponential distribution explains that a quantity sharply decreases with respect to other quantities over a period of time. We calculate the overpressure conditions for 60 selected dykes using their aspect ratios. Calculated overpressure is utilized to estimate the depth of magma origin, which in turn is used to estimate the magnitude of maximum and minimum principal stresses. Based on this collective information, we propose a conceptual model of dyke emplacement. Consequently, the results have critical implications in understanding magma chamber dynamics.

我们详细介绍了印度东部 Chotanagpur 片麻岩杂岩 (CGC) 岩脉的结构特征，以了解岩脉侵位机制和岩浆室动力学。研究区包括 CGC 的两个时间上不同的部分，即元古代 CGC 和冈瓦纳 CGC。Gondwana CGC 的岩脉根据它们侵入砂岩或玄武岩分为两种类型。堤坝长度和厚度的尺寸分布分别遵循幂律和指数分布。幂律解释了两个量之间的非线性函数关系，其中一个量随另一个量的幂而变化。幂律的基本特性是它是尺度不变的并且代表了问题的普遍性。指数分布解释了一个数量在一段时间内相对于其他数量急剧减少。我们使用纵横比计算 60 个选定堤坝的超压条件。计算出的超压用于估计岩浆起源的深度，进而用于估计最大和最小主应力的大小。基于这些集体信息，我们提出了堤坝就位的概念模型。因此，这些结果对理解岩浆房动力学具有重要意义。这反过来又用于估计最大和最小主应力的大小。基于这些集体信息，我们提出了堤坝就位的概念模型。因此，这些结果对理解岩浆房动力学具有重要意义。这反过来又用于估计最大和最小主应力的大小。基于这些集体信息，我们提出了堤坝就位的概念模型。因此，这些结果对理解岩浆房动力学具有重要意义。