Quantitative evaluation of the stability relations of riebeckite, in the system Na-Fe-MgSi-C-GH at low temperature and pressure, is based upon estimated thermodynamic parameters for riebeckite and on chemical and petrologic data. This evaluation forms the basis for an assessment of the conditions of riebeckite formation in the Dales Gorge Member, Hamersley Group, Western Australia. Computed val...

*Correspondence: Marianne Holmer, Department of Biology, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark e-mail: [email protected] Sulfide intrusion in seagrasses, as assessed by stable sulfur isotope signals, is widespread in all climate zones, where seagrasses are growing. Seagrasses can incorporate substantial amounts of 34S-depleted sulfide into their tissues wit...

We view the structures and features described in this atlas as sedimentary structures, albeit of a complex organo-physico-chemical origin. Just like their physical sedimentary structure counterparts (e.g., Pettijohn and Potter, 1964), they can be of great assistance in unravelling depositional palaeoenvironments inferred for ancient rock successions. Pettijohn and Potter (1964) included stromat...

The shale oil reservoir of the Lucaogou Formation in Jimsar Sag has undergone tectonic movement, regional deposition and complex diagenesis processes. Therefore, various space types combination patterns pores have developed, resulting an intricate pore throat structure. structure brings great challenges to classification evaluation reservoirs efficient development oil. methods scanning electron...

An assessment performed using raman spectroscopy has found space in the black shales of Cisuralian-age rocks Karoo Basin South Africa, particularly those from Guadalupian Ripon, Cisuralian Whitehill and Prince Albert Formations. It is used conjunction with geochemical screening techniques such as organic petrology programmed pyrolysis. In turn, combination these for thermal maturity sedimentary...

The causes of mass extinctions and the nature of taxonomic radiations are central questions in paleobiology. Several episodes of taxonomic turnover in the fossil record, particularly the major mass extinctions, are generally thought to transcend known biases in the geologic record and are widely interpreted as distinct macroevolutionary phenomena that require unique forcing mechanisms. Here, by...

Correlations between mapping units of costal sedimentary basin and interpretation of piezocone test results are presented and discussed based on examples from Caravelas strandplain, (State of Bahia), Paranaguá (State of Paraná) and Guarujá bays (State of São Paulo), Brazil. Recognizing that the sedimentary environment was mainly controlled by sea level fluctuations led to the interpretation of ...