Lava stratigraphy of Lonavala subgroup of Deccan trap formation
Author(s): Prashant Uttamrao Terker
Abstract: The Deccan Trap Formation in western India represents one of the largest continental flood basalt provinces globally, and its stratigraphy provides valuable insights into Earth’s volcanic and tectonic history. This study focuses on the lava stratigraphy of the Lonavala Subgroup, situated between the Kalsubai and Wai subgroups, using an integrated approach of field mapping, petrography, and geochemistry. Stratigraphic logging revealed a series of basaltic lava flows characterized by alternating massive and vesicular units, with red bole horizons indicating intermittent volcanic pauses. Petrographic analysis showed tholeiitic basalts composed mainly of plagioclase, clinopyroxene, and iron-titanium oxides, while amygdaloidal zones were infilled with zeolites, calcite, and quartz. Geochemical data revealed major and trace element variations suggesting fractional crystallization and enriched mantle sources with crustal contamination. These findings confirm the complex, episodic nature of Deccan volcanism and highlight the stratigraphic, petrological, and environmental importance of the Lonavala Subgroup.
Pages: 166-174 | Views: 26 | Downloads: 15Download Full Article: Click Here
How to cite this article:
Prashant Uttamrao Terker. Lava stratigraphy of Lonavala subgroup of Deccan trap formation. Int J Geogr Geol Environ 2024;6(2):166-174.
