This study assesses the prospectivity of world’s oldest known stacked petroleum systems from Proterozoic greater McArthur Basin (Northern Territory, Australia), which has immense potential to host both conventional natural gas and oil, in addition shale-gas accumulations. The Mesoproterozoic succession Beetaloo Sub-basin surrounding region hosts Territory’s premier play is at an advanced stage ...

5.14.5 References Planetary Moment of Inertia and the Spin-Axis Apparent Polar Wander (APW) = Plate motion + TPW Different Information in Different Reference Frames Type 0' TPW: Mass Redistribution at Clock to Millenial Timescales, of Inconsistent Sense Type I TPW: Slow/Prolonged TPW Type II TPW: Fast/Multiple/Oscillatory TPW: A Distinct Flavor of Inertial Interchange Hypothesized Rapid or Prol...

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Throughout the Proterozoic Era, sedimentary organic carbon burial helped set pace of global oxygenation and acted as a major modulator atmospheric CO2 climate. Although rocks generally contain low concentrations matter (OM), there are key exceptions to this rule, including relatively OM-rich Arctic Bay shales from Baffin Island, Canada (Bylot Supergroup, Borden Basin, ∼1.05 Ga). The mechanisms ...

Ion microprobe age determinations of 102 detrital zircon crystals from a sand extrudite, Cretaceous Paraná volcanic province, set limits on the origin of the numerous sand layers present in this major flood basalt province. The zircon U-Pb ages reflect four main orogenic cycles: Mesoproterozoic (1155-962 Ma), latest Proterozoic-early Cambrian (808-500 Ma) and two Palaeozoic (Ordovician- 480 to ...

Conical stromatolites are thought to be robust indicators of the presence of photosynthetic and phototactic microbes in aquatic environments as early as 3.5 billion years ago. However, phototaxis alone cannot explain the ubiquity of disrupted, curled, and contorted laminae in the crests of many Mesoproterozoic, Paleoproterozoic, and some Archean conical stromatolites. Here, we demonstrate that ...

The Mesoproterozoic deep ocean is thought to have been largely anoxic, dominated by ferruginous conditions. Phosphate was scavenged from the water column iron oxyhydroxides, and dissolved nitrate rapidly reduced along redoxcline. Primary productivity therefore generally low, eukaryotic life restricted oxic marine margins. This model supported new nitrogen isotope data Lower Riphean (ca. 1.55 Ga...