Geochemistry of the Palaeo–Mesoproterozoic Tadpatri shales, Cuddapah basin, India: implications on p

• 作者: Rahul Mitra Gopal Chakrabarti Debasish Shome
• 学科: 地球科学
• 关键词: Tadpatri Provenance Paleoweathering Paleoredox Geochemistry
• 年，卷（期）: 2022,（5）
• 页码范围: 715-733
• 页数: 18页
• 语种: 英文
• DOI: 10.1007/s11631-017-0254-3

摘要

The Palaeo–Mesoproterozoic Tadapatri formation of the Cuddapah basin is comprised of clastic sedimentary rocks with minor carbonates and mafic–ultramafic sill bodies. Geochemistry of the shale is used to study the provenance, paleoweathering and paleoredox conditions of this Tadpatri formation in order to better understand the development of the Cuddapah basin during Palaeo–Mesoproterozoic time. The higher CIA (average 74.39), PIA (average 85.94) and CIW (average 87.59) values of the Tadpatri shales suggest intensely weathered sources. Higher Al2O3/TiO2 (average 30.78) and LREE/HREE ratio (average 8.80) with negative europium anomaly indicate derivation of the clastic sediments from a felsic source rock. The geochemical parameters like U, U/Th, Cu/Zn, Ni/Co, V/Cr ratios reveal that the Tadpatri shales are mainly deposited in an oxic condition.