نتایج جستجو برای: late diagenesis
تعداد نتایج: 196766 فیلتر نتایج به سال:
Other than halite diagenesis and organic matter degradation, Cl and Br are considered to be conservative in marine pore fluids. Consequently, Br/Cl ratios should remain constant during most diagenetic reactions. Nonetheless, Br/Cl molar ratios decrease to 1.27 3 10 ('18% less than seawater value) in pore fluids from Site 833 in the Aoba Basin of the New Hebrides convergent margin despite the la...
The Ellenburger Group of the West Texas Permian Basin is part of a Lower Ordovician carbonate platform sequence that covers a large area of the United States. During the Early Ordovician, the Permian Basin area was located on the southwest edge of the Laurentia plate between 20° and 30° latitude. The equator crossed northern Canada, situating Texas in a tropical to subtropical latitude. The are...
Chemical analyses of historical and prehistoric bone material provide us with a complex body of knowledge in bioarcheological studies. These can be used for reconstructing diet, migration, climate changes and the weaning process. The analysis of enamel, dentin and bones allows researchers to gather data on life strategies of an individual by retrospectively tracing his ontogenetic phases. This ...
The mineralogy and geochemistry of the bulk rock and clay fraction of sediments deposited at the CretaceousTertiary transition and in the KTB layer have been investigated by various methods in two sections from the Betic Cordilleras (Agost, Caravaca) and five sections from the Basque-Cantabrian Basin (Monte Urko, Sopelana, Zumaya, Hendaye, Biarritz). Active terrigenous supply prevailed in both ...
The Paleoproterozoic Era witnessed crucial steps in the evolution of Earth's surface environments following the first appreciable rise of free atmospheric oxygen concentrations ∼2.3 to 2.1 Ga ago, and concomitant shallow ocean oxygenation. While most sedimentary successions deposited during this time interval have experienced thermal overprinting from burial diagenesis and metamorphism, the ca....
The Middle Mississippian Delle phosphatic event marks a significant change in depositional conditions in the Devonian–Mississippian Antler foreland basin of North America. Stratigraphic and petrographic studies show that deposition of Delle-event rocks ended a long period of open-marine carbonate sedimentation when facies shifted to phosphorites, cherts, fine-grained siliciclastics, and lime mu...
This paper takes polymorphism to the multi-object level. Traditional inheritance, polymorphism, and late binding interact nicely to provide both flexibility and safety – when a method is invoked on an object via a polymorphic reference, late binding ensures that we get the appropriate implementation of that method for the actual object. We are granted the flexibility of using different kinds of...
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