Cosmogenic nuclide burial dating

Posted by / 06-Sep-2020 03:19

Cosmogenic nuclide burial dating

But the coupling of 10Be with the stable nuclide 21Ne would significantly improve the burial dating range up to the middle Miocene, which is promising in revolutionizing the chronology study for the Late Cenozoic terrestrial sedimentary sequences.We have applied 10Be-21Ne pair for dating the middle Miocene sediments of the Hongliu Valley in southern Ningxia basin.The first is the development of the 'isochron' method for burial dating with cosmogenic 26Al and 10Be.An isochron uses multiple samples from the same site to check that all assumptions required for cosmogenic burial dating are met, including that the sediment has not been reworked.Our 10Be-21Ne analysis demonstrates the age of the burial sample is 12.4( 0.6/-0.4) Ma, and the erosion rate at the source area is 0.26±0.01 cm ka-1.The sample's burial age is consistent with the age constraint set by the Hongliugou Formation (16.7-5.4 Ma) which we collected the sample in.This successful cosmogenic dating represents the collaborative work of Granger and Gibbon.The new date is made possible by two major advances in methodology.

The burial ages of the overlying Quaternary sediments provide the lower age limit of the Sanying Formation: 2 Ma.The Pliocene fluvial/lacustrine sediments of the Sanying Formation lie along the Red River fault and its northwest extension; their majority outcrops appear around Eryuan.The Sanying Formation is characterized by multiple intercalated coal layers and its unconformities contact with the underlying Triassic limestone and the overlying Quaternary coarse sediments.In situ-produced cosmogenic nuclides provide a powerful tool for the sediment dating based on the time-dependent concentration ratio of two nuclides, which are produced in the same mineral but with different half-lives.Thereinto,10Be-26Al is the most widely used nuclide pairs, of which the available dating range spans the Plio-Pleistocene.

cosmogenic nuclide burial dating-36cosmogenic nuclide burial dating-52cosmogenic nuclide burial dating-84

We therefore propose that activation of the Red River and the Jianchuan faults during the Late Miocene resulted in subsidence of basins in the extensional areas around Eryuan and in the middle to south segments of the Red River fault.

One thought on “cosmogenic nuclide burial dating”