Martinson age dating and the orbital theory No cc 100 free chat

The error associated with each tuning approach is estimated independently and propagated through to the average result.

The resulting erorr estimate is independent of that associated with the degree of convergence and ahs 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.

martinson age dating and the orbital theory-80martinson age dating and the orbital theory-17

AA(Lamont-Doherty Geological Observatory, Palisades, New York 10964 USA), AB(College of Oceanography, Oregon State University, Corvallis, Oregon 97331 USA), AC(Lamont-Doherty Geological Observatory, Palisades, New York 10964 USA), AD(Department of Geological Sciences, Brown University, Providence, Rhode Island 02912 USA), AE(Exxon Production Research, Houston, Texas 77001 USA), AF(Sub-Department of Quaternary Research, The Godwin Laboratory, Free School Lane, Cambridge, England CB2 3RS) Using 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. 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.

Excellent convergence between chronologies developed using each of five different paleoclimatological indicators (from a single core) is also obtained.

In the 1980s, the international SPECMAP project (SPECtral MAping Project) was launched with the aim of producing continuous time series of Ice Age climate recorded in deep-sea sediments, and studying their spectral properties.

One of SPECMAP’s first, and most referenced, achievements was to publish an astronomical time-scale for the upper Pleistocene (last 780 ka) based on an oxygen isotope reference curve constructed from stacking five planktonic foraminifer isotopic records from low- and mid-latitudes (Imbrie et al., ).

This stacked curve, phase-locked (tuned) to obliquity and precession orbital oscillations, provided a continuous geological time scale for the upper Pleistocene, accurate to within 5 kyr. Using the Concept of "orbit 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. The error measured by the standard deviation about the average of these four results (which represent 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 indicators (from a single core) is also obtained.the resultant chronology is also insensitive to the specific indicator used.

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