P-PINI: A cosmogenic nuclide burial dating method for landscapes undergoing non-steady erosion

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F23%3A00567420" target="_blank" >RIV/67985530:_____/23:00567420 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S1871101422001686" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1871101422001686</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.quageo.2022.101420" target="_blank" >10.1016/j.quageo.2022.101420</a>

Jazyk výsledku

angličtina

Název v původním jazyce

P-PINI: A cosmogenic nuclide burial dating method for landscapes undergoing non-steady erosion

Popis výsledku v původním jazyce

Existing methods of cosmogenic nuclide burial dating perform well provided that sediment sources undergo steady rates of erosion and the samples experience continuous exposure to cosmic rays. These premises exert important limitations on the applicability of the methods. And yet, high mountain sediment sources are rife with transient processes, such as non-steady erosion by glacial quarrying and/or landsliding, or temporary cosmic-ray shielding beneath glaciers and/or sediment. As well as breaching the premises of existing burial dating methods, such processes yield samples with low nuclide abundances and variable Al-26/Be-10 ratios that may foil both isochron and simple burial-age solutions. P-PINI (Particle-Pathway Inversion of Nuclide Inventories) is a new dating tool designed for dating the burial of sediments sourced from landscapes characterized by abrupt, nonsteady erosion, discontinuous exposure, and catchments with elevation-dependent Al-26/Be-10 production ratios. P-PINI merges a Monte Carlo simulator with established cosmogenic nuclide production equations to simulate millions of samples (Be-10-Al-26 inventories). The simulated samples are compared statistically with Be-10-Al-26 measured in field samples to define the most probable burial age. Here, we target three published Be-10-Al-26 datasets to demonstrate the versatility of the P-PINI model for dating fluvial and glacial sediments. (1) The first case serves as a robust validation of P-PINI. For the Pulu fluvial gravels (China), we obtain a burial age of 1.27 +/- 0.10 Ma (1 sigma), which accords with the isochron burial age and two independent chronometers reported in Zhao et al. (2016) Quaternary Geochronology 34, 75-80. The second and third cases, however, reveal marked divergence between P-PINI and isochron-derived ages. (2) For the fluvial Nenana Gravel (USA), we obtain a minimum-limiting burial age of 4.5 +/- 0.7 Ma (1s), which is compatible with unroofing of the Alaska Range starting similar to 6 Ma, while calling into question the Early Pleistocene isochron burial age presented in Sortor et al. (2021) Geology 49, 1473-1477. (3) For the Bunten Till (Switzerland), we obtain a limiting burial age of <204 ka (95th percentile range), which conforms with the classical notion of the most extensive glaciation in the northern Alpine Foreland assigned to the Riss glaciation (sensu marine isotope stage 6) contrary to the isochron burial age presented in Dieleman et al. (2022) Geosciences, 12, 39. Discrepancies between P-PINI and the isochron ages are rooted in the challenges posed by the diverse pre-burial Al-26/Be-10 ratios produced under conditions characteristic of high mountain landscapes.

Název v anglickém jazyce

P-PINI: A cosmogenic nuclide burial dating method for landscapes undergoing non-steady erosion

Popis výsledku anglicky

Existing methods of cosmogenic nuclide burial dating perform well provided that sediment sources undergo steady rates of erosion and the samples experience continuous exposure to cosmic rays. These premises exert important limitations on the applicability of the methods. And yet, high mountain sediment sources are rife with transient processes, such as non-steady erosion by glacial quarrying and/or landsliding, or temporary cosmic-ray shielding beneath glaciers and/or sediment. As well as breaching the premises of existing burial dating methods, such processes yield samples with low nuclide abundances and variable Al-26/Be-10 ratios that may foil both isochron and simple burial-age solutions. P-PINI (Particle-Pathway Inversion of Nuclide Inventories) is a new dating tool designed for dating the burial of sediments sourced from landscapes characterized by abrupt, nonsteady erosion, discontinuous exposure, and catchments with elevation-dependent Al-26/Be-10 production ratios. P-PINI merges a Monte Carlo simulator with established cosmogenic nuclide production equations to simulate millions of samples (Be-10-Al-26 inventories). The simulated samples are compared statistically with Be-10-Al-26 measured in field samples to define the most probable burial age. Here, we target three published Be-10-Al-26 datasets to demonstrate the versatility of the P-PINI model for dating fluvial and glacial sediments. (1) The first case serves as a robust validation of P-PINI. For the Pulu fluvial gravels (China), we obtain a burial age of 1.27 +/- 0.10 Ma (1 sigma), which accords with the isochron burial age and two independent chronometers reported in Zhao et al. (2016) Quaternary Geochronology 34, 75-80. The second and third cases, however, reveal marked divergence between P-PINI and isochron-derived ages. (2) For the fluvial Nenana Gravel (USA), we obtain a minimum-limiting burial age of 4.5 +/- 0.7 Ma (1s), which is compatible with unroofing of the Alaska Range starting similar to 6 Ma, while calling into question the Early Pleistocene isochron burial age presented in Sortor et al. (2021) Geology 49, 1473-1477. (3) For the Bunten Till (Switzerland), we obtain a limiting burial age of <204 ka (95th percentile range), which conforms with the classical notion of the most extensive glaciation in the northern Alpine Foreland assigned to the Riss glaciation (sensu marine isotope stage 6) contrary to the isochron burial age presented in Dieleman et al. (2022) Geosciences, 12, 39. Discrepancies between P-PINI and the isochron ages are rooted in the challenges posed by the diverse pre-burial Al-26/Be-10 ratios produced under conditions characteristic of high mountain landscapes.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Quaternary Geochronology

ISSN

1871-1014

e-ISSN

1878-0350

Svazek periodika

74

Číslo periodika v rámci svazku

February

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

101420

Kód UT WoS článku

000904655200001

EID výsledku v databázi Scopus

2-s2.0-85143883562