Acumulações químicas e marcadores organofílicos do quaternário superior da sub-bacia de Icaraí, Itarema-Ce, Brasil.

Abstract

Byusingof three sampled in the Quaternary of the west coast of Ceará-Brazil, in Itarema, this research applies methods for analysis of chemical and biotic parameters,showing CaCO3above 80%; concentration of Organic Matter (OM) and Organic Carbon (OC) with a tendency to alter Kerogen I; marine and terrestrial Nitrogen; detection of Ca linked groups inindicateenzymatic groups and metabolites, as showed byof Infrared Spectrophotometry; mineralogical activitiesof Fe, K, Si and Al through X-ray diffractometryand the morphologiccharacteristicsby Exoscopy; microfaunistic identifications and their relationship with the depositional environment. Polycyclic Aromatic Hydrocarbons (PAH) inthe maturation process of organic matter, carbonated minerals such as Dolomite, Kaolinite and Magnesite and high ratio of Planktonic x Benthic foraminifera (B / W ratio) demonstratefewchangesof sea level, but great fluvial and recent estuarine impact, pointedby G. menardiiplexus foraminíferous as the main bioindicator of ocean temperature on the west coast of Ceará. Nitrification and denitrification, sulfation and phosphating mark as reducing microbiological activities and residual oxidantsin the ORP e pH changes. Diagenetic processesand mineralizations, such as dolomitization and pyridization in some layers, correlated to the presence of algalic components evidencea consolidated turbiditic system.