The Cambrian Longwangmiao gas reservoirs in the Moxi area of Sichuan Basin have a complex associated accumulation history. Based on core and thin section examination, fluid inclusion analyses 1-D burial-thermal modelling, diagenetic evolution hydrocarbon processes Formation been reconstructed. Various events were identified, making up complete pore fill sequence as follows: solid bitumen/dolomi...

The Titanosauria were much diversified during the Late Cretaceous, but paleobiological information concerning these sauropods continues to be scarce and no studies have been conducted utilizing modern methods of community analysis to infer possible structural patterns of extinct assemblages. The present study sought to estimate species richness and to investigate the existence of structures in ...

--The hydrocarbon content of leaf fossils from Iceland has been investigated by gas chromatography-mass spectrometry. The distribution patterns of normal hydrocarbons, branched hydrocarbons, and cyclic hydrocarbons are compared to those of present-day living organisms. The diagenetic pathways of these hydrocarbons are discussed.

The stable isotope and minor element geochemistry of Neocomian (Lower Cretaceous) pelagic carbonates of the North Atlantic Basin (Deep Sea Drilling Project Sites 105, 367, 387, 391, and 603) was examined to develop a diagenetic model for pelagic limestones. In particular, we hoped to test the fidelity of whole-rock geochemical records as paleoceanographic indicators for pelagic deposits of pre-...

The Ca, Mg, O, and C isotopic and trace elemental compositions of marine limestones and dolostones from ODP Site 1196A, which range in depth ( 58 to 627 mbsf) and in depositional age ( 5 and 23 Ma), are presented. The objectives of the study are to explore the potential for non-traditional isotope systems to fingerprint diagenesis, to quantify the extent to which geochemical proxies are altered...

Impure reworked evaporitic sandstones, preserved on Meridiani Planum, Mars, are mixtures of roughly equal amounts of altered siliciclastic debris, of basaltic provenance (40F10% by mass), and chemical constituents, dominated by evaporitic minerals (jarosite, Mg-, Ca-sulfatesFchloridesFFe-, Na-sulfates), hematite and possibly secondary silica (60F10%). These chemical constituents and their relat...

To improve our understanding of ocean chemistry and biogeochemical cycling following the termination of large-scale Paleoproterozoic iron formation (IF) deposition ( 1.85 billion years ago [Ga]), we conducted a Fe–S–C–Mo geochemical study of the 1.65 Ga Chuanlinggou Formation, Yanshan Basin, North China. Despite the cessation of IF deposition, our results suggest the presence of anoxic but non-...

Field investigation, biostratigraphic, paleoecological, and sedimentary microfacies analyses, as well diagenetic processes characterization, were carried out in the Epirus region (Western Ionian Basin) to define depositional environments further decipher history of Late Cretaceous–Early Paleocene carbonate succession western continental Greece. Planktonic foraminiferal biostratigraphy studied c...