Recent geophysical analyses suggest the presence of a late Paleozoic oxygen pulse beginning in the late Devonian and continuing through to the late Carboniferous. During this period, plant terrestrialization and global carbon deposition resulted in a dramatic increase in atmospheric oxygen levels, ultimately yielding concentrations potentially as high as 35% relative to the contemporary value o...

The Central Asian Orogenic Belt, or Altaids, is an amalgamation of volcanic arcs and microcontinent blocks that records a complex late Precambrian–Mesozoic accretionary history. Although microcontinents cored by Precambrian basement are proposed to play an integral role in the accretion process, a lack of isotopic data hampers volume estimates of newly produced arc-derived versus old-cratonic c...

Iron ore occurrences are situated on the south-eastern slopes of the Medvednica Mountain. They occur as discontinous, decameters long and 2-3.5 m thick bedded, poorly mineralized (15-35 % Fe) lenses. A narrow, 6 km long, ore zone strikes NE-SW from Tisova Peć to Pustodol-Adolfovac. It is spatially and genetically bounded to the basic volcanogenic-sedimentary series (SEDEX-type), metamorphosed i...

Upper Cretaceous intrusives of limited extent crop out in the Coastal Cordillera near Valdivia (39º48’ S), 100 km west main topographic divide Andean Cordillera. Given that plutonic rocks same age at latitudes high Andes coastal emplaced a forearc position upper plate subduction setting. They correspond to hypabyssal displaying mainly porphyritic texture and lithological variations with microto...

Tight sandstone gas (TSG) reservoirs develop extensively in the upper Paleozoic coal bearing strata both southern North China Basin and Ordos Basin. The former has not achieved important advances TSG exploration, while latter built largest production facility China. By comparing accumulation conditions Tongxu area of Fuxian Basin, main controlling factors were analyzed this article. results ind...

The Cambrian transgression across the Great Unconformity produced one of largest expansions shallow marine habitats and associated diversification invertebrate faunas in Earth history. However, identification underlying controls on pattern seas has been hampered by imprecise or inaccurate age assignments for many formations. Recovery an Ehmaniella Zone trilobite fauna from Lodore Formation nort...

The coupled evolution of land plants, CO2, and climate over the last half billion years has maintained atmospheric CO2 concentrations within finite limits, indicating the involvement of a complex network of geophysiological feedbacks. But insight into this important regulatory network is extremely limited. Here we present a systems analysis of the physiological and geochemical processes involve...

Variations in continental volcanic arc emissions have the potential to control atmospheric carbon dioxide (CO2) levels and climate change on multimillion-year time scales. Here we present a compilation of ~120,000 detrital zircon uranium-lead (U-Pb) ages from global sedimentary deposits as a proxy to track the spatial distribution of continental magmatic arc systems from the Cryogenian period t...

—Changes in genus diversity within higher taxa of marine animals on the temporal scale of a few million years are more strongly correlated with changes in extinction rate than with changes in origination rate during the Paleozoic. After the Paleozoic the relative roles of origination and extinction in diversity dynamics are reversed. Metazoa as well as individual higher taxa shift from one mode...