INTRODUCTION Complex organic compounds found in oil and sediments linked with a particular source (such as algae, bacteria or vascular plants) are defined as biomarkers and are useful dating indicators in organic geochemistry. METHODS AND RESULTS This paper presents the composition of the organic matter (OM) on marine surface sediments from a degraded Tunisian coast analysed by pyrolysis and ...

We conducted in situ high-pressure acoustic-wave velocity measurements of Fe2+-bearing MgSiO3 glass up to 158 GPa by Brillouin scattering spectroscopy clarify the effect iron on elasticity and structural evolution silicate melts lower mantle. The change trend VS profile, likely induced transition Si-O coordination number from 6 6+ proposed previous studies glasses, was confirmed be located at ∼...

Abstract Olivine polymorphs are considered the most abundant minerals in Earth and vital to governing its dynamics. Seismic discontinuities near 410 660 km depth attributed phase transitions of olivine have long been reference models. However, significance 520 discontinuity (520) causative transition debated. To address prevalence properties, receiver functions from >2,000 seismographs acros...

background and purpose: in a recent century, the amount of construction waste has increased significantly. although the building industry has a considerable role in the development of a society, it is regarded as an environmentally destructive. source reduction is the highest goal in the waste management hierarchy and is in priority. it also has economic benefits by reducing costs associated wi...

Abstract A compartmental one‐dimensional model of a fluidized bed pyrolytic converter biomass is presented. Reference conditions are those non‐catalytic fast pyrolysis in shallow with external regeneration the material. The fate and resulting char has been modelled by considering elutriation particles, attrition as well drain/regeneration. course primary secondary pyrolitic reactions according ...

The objective of the study was to determine the concentration of total PAHs and to identify the potential sources of contamination in sediments from the Romanian Black Sea sector. Sixteen priority polycyclic hydrocarbons were identified and determined quantitatively in samples of sediment collected from marine areas (depths over 20 m) from the 12 stations located between Sulina and Mangalia, du...