Chemostratigraphy across Devonian-Carboniferous Sedimentary Sequences at Roboré Sub-Basin, Southeastern Bolivia: Correlation and Tectonic Setting

Abstract

A chemostratigraphic analysis was performed on cutting samples from Devonian-Carboniferous intervals belonging to four wells located in the Roboré Sub-Basin, southeast Bolivia. From the multivariate statistical analysis (applying Factor Analysis-FA), it was possible to establish two main geochemical associations that control the chemistry of the analyzed samples: detrital (clay and heavy minerals) and redox-organic matter association. With the application of a hierarchical statistical analysis (cluster constrained), the different geochemical zones (chemozones and sub-chemozones) were established, both for the detrital and redox-organic matter associations. A chemostratigraphic correlation scheme was made, achieving a total correspondence of the established chemozones. A better definition of the predefined stratigraphic contacts was obtained from the chemostratigraphic correlations. The general characteristics of the sources of sediment provenance along the sequences studied were evaluated, as well as the establishment of the tectonic setting. A passive margin tectonic setting is proposed for the sandy facies of the Tupambi Formation and active continental margin for the sediments of the Los Monos Formation

AAPG Datapages/Search and Discovery Article #90326 © 2018 AAPG Latin America & Caribbean Region, Optimizing Exploration and Development in Thrust Belts and Foreland Basins. Santa Cruz de la Sierra, Bolivia, June 6-8, 2018