Granulometric Study of the Lokoja Sandstone, Mid Niger Basin, Nigeria

Abstract

Contribution/ OriginalityThe study contributes to the existing literature on the sandstone facies of the Lokoja Formation in the Mid Niger Basin based on granulometric parameters to establish the depositional environment of the sandstone and sedimentary process that occurred during deposition.

Biogenicity of amorphous organic matter and bacteriomorph acritarchs preserved in wrinkle structures from the Ediacaran Cíjara Formation, Spain

“…As their ratios are close to unity, neither Ce nor Pr anomalies are recorded in the greywacke host rock. Finally, other indicators of redox conditions imply oxic conditions for the Cíjara greywacke substrata, such as the U/Th (<1.25; McKay et al., 2007), V/Cr (<2; Madukwe, 2016) and V/Sc (<9.1; Hetzel et al., 2009) ratios, and even the Ni/Co ratio for the source area's redox state (<5; Jones & Manning, 1994). Therefore, organic matter degradation and mat decomposition should not be associated with dysoxic to anoxic substrata of the Cíjara Formation (precluded by REE redox indicators), but to diagenetic processes and/or weathering oxidation (Pacton et al., 2011).…”

Analysis of Fluvial Sediments and Sedimentary Dynamics of the Assif El Mal Wadi.

“…In the context of this study, grain size emerges as the most fundamental and crucial descriptive property [5], [6], [7], [8], [9]. Granulometric properties, analyzed through sieving for particles above 800 microns and laser methods for fine particles (<800 microns) and their percentages, have been widely employed to decipher depositional history, including the depositional environment, process, hydrodynamic conditions, transportation mechanism, and clues about the provenance [5], [10], [11].…”