Oxygen-depleted and ferruginous seawater composition imprinted in Early Cretaceous Fe-rich Al-glauconites in marginal marine deposits.

ABSTRACT: The composition of marine authigenic iron silicates bears subtle evidence of paleo-oceanographic and paleoclimatic conditions. This study focuses on the compositionally unique glauconite within the Early Cretaceous Pariwar and Habur formations in the Jaisalmer Basin and discusses its implications. The Al-glauconite is enriched in TFe₂O₃ (> 18 wt%), and is considered as Fe-rich Al-glauconite. The X-ray diffraction parameters, the micro-texture, and the K₂O content reveal an evolved to highly evolved structure of the glauconite. It is abundant in shallow subtidal and tidal- and wave-influenced shoreface facies, and it forms either by the alteration of fecal pellets or as bioclast infillings. Micropaleontological and ichnological proxies confirm the glauconiti

SUBMITTER: Chakraborty A 

PROVIDER: S-EPMC12552670 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature