نتایج جستجو برای: mesoproterozoic
تعداد نتایج: 427 فیلتر نتایج به سال:
Records of shallow-marine ramps with the mixing carbonate and siliciclastic sediments are common throughout geological time. All these records have pure deposits as end members, occurring contemporaneously in distinct depositional regions along ramp, transitional hybrid facies between them. The two member can mix different scales alternate time due to climatic changes regressions transgressions...
The emplacement of the Mesoproterozoic Götemar Pluton into Paleoproterozoic granitoid host rocks of the Transscandinavian Igneous Belt is re-examined by microfabric analysis, including cathodoluminescence microscopy. Field data on the pluton-host rock system are used to strengthen the model. The Götemar Pluton, situated on the Baltic Shield of SE Sweden, is a horizontally zoned tabular structur...
Previous geochemical and biomarker studies of the late Paleo-Mesoproterozoic propose a stratified world, with strongly reducing (possibly sulfidic) deep-ocean conditions overlain by an oxygenated surface-ocean and atmosphere. To investigate such a scenario, we look to the structure of the biogeochemical sulfur cycle. We present sulfur (S, S, S, and S in sulfides) isotope data from the McArthur ...
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