MagnetostratigraphyA Powerful Tool for High-Resolution Age-Dating and Correlation in the Miocene Monterey Formation of California: Results from Shell Beach Section, Pismo Basin

1993 ◽  
Author(s):  
Sheraz Khan Omarzai ◽  
Robert S. Coe ◽  
John A. Barron
Keyword(s):  
High Resolution ◽  
Age Dating ◽  
Monterey Formation

scholarly journals Age Dating and the Orbital Theory of the Ice Ages: Development of a High-Resolution 0 to 300,000-Year Chronostratigraphy

1987 ◽  
Vol 27 (1) ◽  
pp. 1-29 ◽  
Author(s):  
Douglas G. Martinson ◽  
Nicklas G. Pisias ◽  
James D. Hays ◽  
John Imbrie ◽  
Theodore C. Moore ◽  
...  
Keyword(s):  
High Resolution ◽  
Deep Sea ◽  
Age Dating ◽  
Average Error ◽  
Orbital Theory ◽  
Oxygen Isotope Stratigraphy ◽  
Orbital Tuning ◽  
Isotope Stratigraphy ◽  
Degree Of Convergence ◽  
Estimated Error

AbstractUsing the concept of “orbital tuning”, a continuous, high-resolution deep-sea chronostratigraphy has been developed spanning the last 300,000 yr. The chronology is developed using a stacked oxygen-isotope stratigraphy and four different orbital tuning approaches, each of which is based upon a different assumption concerning the response of the orbital signal recorded in the data. Each approach yields a separate chronology. The error measured by the standard deviation about the average of these four results (which represents the “best” chronology) has an average magnitude of only 2500 yr. This small value indicates that the chronology produced is insensitive to the specific orbital tuning technique used. Excellent convergence between chronologies developed using each of five different paleoclimatological indicators (from a single core) is also obtained. The resultant chronology is also insensitive to the specific indicator used. The error associated with each tuning approach is estimated independently and propagated through to the average result. The resulting error estimate is independent of that associated with the degree of convergence and has an average magnitude of 3500 yr, in excellent agreement with the 2500-yr estimate. Transfer of the final chronology to the stacked record leads to an estimated error of ±1500 yr. Thus the final chronology has an average error of ±5000 yr.

The ownership of time: approved 14C calibration or freedom of choice?

Antiquity ◽  
2005 ◽  
Vol 79 (306) ◽  
pp. 944-948 ◽  
Author(s):  
Tjeerd H. van Andel
Keyword(s):  
High Resolution ◽  
Basic Research ◽  
Age Dating ◽  
Freedom Of Choice ◽  
Last Glaciation ◽  
Primary Responsibility ◽  
Climate Events

Rapid extension of 14C-age dating into the Last Glaciation due to a rising interest in high-resolution climate events is demanding ever greater emphasis on accurate stratigraphic placement of samples relative to events or objects to be dated. This shifts the primary responsibility for date quality from the producer of dates, who is responsible for their precision, to geological and archaeological consumers, who are responsible for their stratigraphic and calibrated accuracy. It is essential that both sides accept the partial switch of mutual roles and collaborate constructively and respect the traditional freedom of choice that marks basic research.

Impacts of climatic changes on fluvial sediment fluxes in north western Europe: The Middle and Late Pleistocene Meuse river system

2021 ◽  
Author(s):  
Ewerton da Silva Guimarães ◽  
Ronald T. van Balen ◽  
Cornelis Kasse ◽  
Freek S. Busschers ◽  
Renaud Bouroullec
Keyword(s):  
Climate Change ◽  
High Resolution ◽  
Age Dating ◽  
Middle Pleistocene ◽  
Fluvial Terrace ◽  
River Catchment ◽  
Sediment Fluxes ◽  
Pleistocene Climate ◽  
Source To Sink ◽  
Climate Transition

<p>Climate change and tectonics can generate signals in a source-to-sink system in the form of changing sediment supply. The study of the propagation of this signal through the system might elucidate how different source-to-sink systems respond to a given perturbation, for instance, the Early to Middle-Pleistocene climate transition. Knowledge on the temporal and spatial responses to such perturbations in a catchment is still limited. Previous studies, with the support of landscape evolution models, demonstrate that several thousands of years might be needed for an extreme-climate-transition-induced signal to propagate through a river catchment (an example of source-to-sink system). The present work aims to contribute to the understanding of how such systems might react when submitted to rapid climate change events by studying the Meuse river catchment. The primary goals are to characterize and quantify the main controls on sediment flux of this fluvial system as a response to the Early to Middle Pleistocene climate transition as well as to assess how climate signals propagated through this source-to-sink system during the last four glacial-interglacial cycles, starting around 450.000 years ago.</p><p>To achieve our goals, three main tasks are proposed. In the first stage of this project, with the support of high-resolution DEM and high-resolution sedimentary cores, the different Meuse fluvial terrace maps are updated. For that, a new cross-border fluvial terrace map between the Netherlands, Belgium and Germany is produced. Characterization and mapping of sediment grain-size and provenance is also carried out. The new Meuse terrace map will guide the sampling campaign of Meuse terrace sediments. The samples will be used for cosmogenic-nuclide age-dating of the sampled terraces. Two dating methods will be used depending on how deeply buried and well-preserved the terraces are: burial isochrone (<sup>26</sup>Al/<sup>10</sup>Be) where sediment cover thickness is greater than 4,5 – 5 m, and depth profile (<sup>10</sup>Be) when the terrace surface is well preserved. These methods will be applied to specific terrace steps, in order to date those around the Mid-Pleistocene transition. Beryllium-10 age-dating will possibly also be applied to specific sedimentary levels (cores, outcrops), in order to infer averaged denudation rates and, consequently, the sediment fluxes, during the investigated climatic cycles. During the latter part of the project, all the data will be set in a temporal framework using the cosmogenic dating results and existing age controls.</p>

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