ABSTRACT

The Upper Subarnarekha Kangsabati Interfluve (USKI) belongs to the eastern margin of CGGC, which is part of East Indian Shield. This Proterozoic (1.72–1.87 Ga) terrain had have experienced intensive weathering processes over the long period under different climatic conditions. A total number of 965 Rebound (R) value were collected from eight geomorphic features located in the USKI. In the present study, an attempt has been made to synthesize the history and variation in intensity of weathering using Schmidt hammer (SH). The degree of weathering is calculated using micro-weathering index, which is formulated on Schmidt hammer R-values, collected from deeply weathered (DW) and relatively less weathered (RLW) rock surfaces. The results of the study revealed the different response of diverse types of rock to the geomorphic processes. The weathering grade of each identified geomorphic features has been computed and the results revealed that seven features belong to moderately weathered (grade III) out of eight identified features. The present study is a unique attempt considering multi-cyclic evolution of CGGC to understand the degree of weathering of these studied features, belonging from USKI. This study helps to understand the weathering grade of studied features in quantitative way.

摘要

Upper Subarnarekha Kangsabati Interfluve (USKI) 属于 CGGC 东缘，是东印度地盾的一部分。这片元古代（1.72~1.87 Ga）地形在不同的气候条件下经历了长期的强烈风化过程。从位于 USKI 的八个地貌特征中收集了总共 965 个回弹 ( R ) 值。在本研究中，已尝试使用施密特锤 (SH) 综合风化的历史和强度变化。风化程度使用微风化指数计算，该指数是在 Schmidt hammer R上制定的- 从深度风化 (DW) 和相对较少风化 (RLW) 的岩石表面收集的值。研究结果揭示了不同类型的岩石对地貌过程的不同反应。计算了每个已识别地貌特征的风化等级，结果表明，在已识别的 8 个特征中，有 7 个属于中度风化（III 级）。本研究是考虑 CGGC 的多循环演化以了解这些研究特征的风化程度的独特尝试，属于 USKI。本研究有助于定量地了解所研究特征的风化等级。