Cosmogenic nuclide dating ppt

08-Aug-2017 20:20

The time of burial (shielding from cosmic rays) can be determined using cosmogenic nuclide-pairs with different half-lives.

Typical example is the burial dating of sediment trapped in caves using the Be nuclide-pair.

Spallation reactions occur in minerals in the rocks upon bombardment by cosmic rays.

By sampling the rocks and separating certain minerals (such as quartz or pyroxene) and calculating the amount of these minerals (as a ratio to other, stable, minerals), we can work out how long the rock has been exposed on the earth’s surface.

Numerical age determination of the terraces is essential for the determination of the incision rate of the Danube and connected uplift rate of the TR.

First application of in-situ produced cosmogenic nuclides in the region was the age determination of strath terraces of the Danube using in situ produced cosmogenic Be depth profiles revealed that the onset of the incision of the Danube was probably triggered by the mid-Pleistocene climate transition between 1.2 and 0.7 ka (Ruszkiczay-Rüdiger et al., 2016a).

Applications in Hungary The Danube, the major river of the Pannonian Basin system, is the only river cutting through the NE-SW Transdanubian Range (TR).

River terraces show an up-warped pattern approaching the axis of the TR documenting differential uplift rates along the river.

cosmogenic nuclide dating ppt-28

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The faster is the denudation the lower is the equilibrium level.Terrestrial in situ produced cosmogenic nuclides a geochronological tool for Quaternary geology and geomorphology Terrestrial in-situ produced Cosmogenic Nuclides (TCN) are suitable for the determination of the exposure age, burial age and denudation rate of rock surfaces, sediments and landforms.