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<p>The Dharwar Craton of South India, a key geological province, provides valuable insights into Precambrian palaeoweathering processes and crustal evolution. Herein, Thamatakal section on the Closepet Granite was investigated for detailed, sequential morphological, micromorphological, and geochemical signatures to understand palaeoweathering and palaeoclimate conditions. The studied section is about 1.8&#xa0;m, which is divided into an upper relict weathered profile (~ 85&#xa0;cm) and a lower buried weathered profile (&gt; 80&#xa0;cm). The morphological and micromorphological observations reveal progressive mineral disintegration, void formation, structural transformations and diagnostic pedofeatures, which are indicative of oxidative and significant leaching conditions. These findings are further corroborated by geochemical variations across the profile, which reflect specific climatic conditions and pedogenesis. The findings highlight advanced weathering in the upper part of the buried profile, resulting from the redistribution of elements triggered by environmental transitions during the late Archaean. This integrative approach enhances understanding of palaeoweathering dynamics and provides additional data for a greater understanding of Earth's early atmospheric and geological evolution.</p>

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Regolith profile on Closepet Granite: records of late Archean weathering and climate conditions

  • 期刊论文

  • 发表日期：

    2025年4月29日

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  • Chaitanya Popli,
  • Seema Singh,
  • Nisha Rani,
  • Pankaj Kumar

摘要

The Dharwar Craton of South India, a key geological province, provides valuable insights into Precambrian palaeoweathering processes and crustal evolution. Herein, Thamatakal section on the Closepet Granite was investigated for detailed, sequential morphological, micromorphological, and geochemical signatures to understand palaeoweathering and palaeoclimate conditions. The studied section is about 1.8 m, which is divided into an upper relict weathered profile (~ 85 cm) and a lower buried weathered profile (> 80 cm). The morphological and micromorphological observations reveal progressive mineral disintegration, void formation, structural transformations and diagnostic pedofeatures, which are indicative of oxidative and significant leaching conditions. These findings are further corroborated by geochemical variations across the profile, which reflect specific climatic conditions and pedogenesis. The findings highlight advanced weathering in the upper part of the buried profile, resulting from the redistribution of elements triggered by environmental transitions during the late Archaean. This integrative approach enhances understanding of palaeoweathering dynamics and provides additional data for a greater understanding of Earth's early atmospheric and geological evolution.