In situ cosmogenic 10Be production-rate calibration from the Southern Alps, New Zealand

Putnam, Aaron E.; Schaefer, Joerg M.; Barrell, David; Vandergoes, Marcus J.; Denton, George H.; Kaplan, Michael R.; Finkel, Robert C.; Schwartz, Roseanne; Goehring, Brent M.; Kelley, Samuel E.

doi:10.1016/j.quageo.2009.12.001

Cited by 249 publications

(268 citation statements)

References 56 publications

Supporting

Mentioning

252

Contrasting

Order By: Relevance

“…Further, the independent control on the calibration age vary from tightly clustered minimum and maximum radiocarbon ages to correlation to climate proxies, yielding production rates of varying reliability. However, the updated global production rates have a tighter clustering and are 9-11 % lower than the global CRONUS production rates (Balco et al, 2008) in agreement with recent lower 10 Be production rates (Balco et al, 2009;Putnam et al, 2010;Fenton et al, 2011;Kaplan et al, 2011;Briner et al, 2012;Goehring et al, 2012;Ballantyne and Stone, 2012;Young et al, 2013;Kelly et al, in press). Using the CRONUS calculator code for exposure age calculations, the global production rate uncertainties are taken to reflect a combined uncertainty from the individual site uncertainties as well as spatial and temporal production rate scaling, and they are used to derive the external exposure age uncertainty (Balco et al, 2008).…”

Section: An Updated Global 10supporting

confidence: 72%

“…Several recent 10 Be production rate calibration studies have indicated that the reference 10 Be production rate used in the CRONUS online calculator is a bit too high (Balco et al, 2009;Putnam et al, 2010;Fenton et al, 2011;Kaplan et al, 2011;Briner et al, 2012;Goehring et al, 2012;Ballantyne and Stone, 2012;Young et al, 2013;Kelly et al, in press). To calculate an updated production rate the reference 10 Be production rate of the CRONUS online calibration sites (Nishiizumi et al, 1989;Gosse et al, 1995;Larsen, 1996;Stone et al, 1998;Kubik and Ivy-Ochs, 2004;Farber et al, 2005) as well sites in recent calibration studies have been recalibrated (Fig.…”

Section: An Updated Global 10mentioning

confidence: 99%

See 1 more Smart Citation

Paleoglaciation of the Tibetan Plateau and surrounding mountains based on exposure ages and ELA depression estimates

Heyman

2014

Quaternary Science Reviews

173

153

View full text Add to dashboard Cite

The Tibetan Plateau holds an ample record of past glaciations, and there is an extensive set of glacial deposits dated by exposure dating. Here a compilation is presented of 10 Be exposure ages from 485 glacial deposits with 1855 individual samples on the Tibetan Plateau, and ELA depression estimates for the glacial deposits based on a simple toe to headwall ratio approach. To recalculate the Tibetan Plateau exposure ages, 10Be production rates from 24 calibration sites across the world are compiled and recalibrated yielding an updated global reference 10 Be production rate. The recalculated exposure ages from the Tibetan Plateau glacial deposits are then divided into three groups based on exposure age clustering, to discriminate good (well-clustered) from poor (scattered) deglaciation ages. A major part of the glacial deposits have exposure ages affected by prior or incomplete exposure, complicating exposure age interpretations. The well-clustered deglaciation ages are primarily from mountain ranges along the margins of the Tibetan Plateau with a main peak between 10 and 30 ka, indicating glacial advances during the global LGM. A large number of deglaciation ages older than 30 ka indicates maximum glaciation predating the LGM, but the exposure age scatter generally prohibits accurate definition of the glacial chronology. The ELA depression estimates scatter significantly, but the main part is remarkably low. Average ELA depressions of 337 ± 197 m for the LGM and 494 ± 280 m for the pre-LGM indicate restricted glacier expansion.

show abstract

Section: An Updated Global 10supporting

confidence: 72%

Section: An Updated Global 10mentioning

confidence: 99%

Paleoglaciation of the Tibetan Plateau and surrounding mountains based on exposure ages and ELA depression estimates

Heyman

2014

Quaternary Science Reviews

173

153

View full text Add to dashboard Cite

show abstract

“…Cobb Valley -41 173 12 (9) (Shulmeister et al, 2005) Taramakau -43 171/172 34 (29) (Barrows et al, 2013) Arthur's Pass -43 172 5 (4) (Ivy-Ochs et al, 1999) Waimakariri -43 172 31 (29) (Rother et al, 2015) Rakaia Valley -43/-44 171/172 55 (46) (Shulmeister et al, 2010;Putnam et al, 2013a) Cameron glacier -43 171 10 (10) (Putnam et al, 2012) Franz Josef -43/-44 170 6 (6) (Barrows et al, 2007b) Rangitata Valley -43/-44 171 56 (51) (Rother et al, 2014) Pukaki -44 170/171 169 (159) (Schaefer et al, 2006;Putnam et al, 2010a;Kelley et al, 2014;Doughty et al, 2015;Schaefer et al, 2015) Ohau -44 170 91 (84) (Kaplan et al, 2013;Putnam et al, 2013b) Irishman Stream -44 170 33 (31) Cascade Plateau -44 168 19 (14) (Sutherland et al, 2007) Boundary Stream Tarn -44 170 10 (10) (Putnam et al, 2010b) Total within Last Glacial Cycle 531 (482) 37 Table 2. The timing of culminations in glacial advances identified from relative cumulative 4 probability density functions for New Zealand and Patagonia using the New Zealand 5 production rate of , and using the Patagonian production rate (PPR) of 6 Kaplan et al (2011) for Patagonia.…”

Section: New Zealandmentioning

confidence: 99%

“…Table 1), shown against the Marine Isotope Stages from and the gLGM from Clark et al (2009). (A and C) For Patagonia and New Zealand, respectively: all 10 Be exposure ages within 110-10 ka, including author-identified outliers, as mean ages with standard errors recalculated using the Putnam et al (2010b) production rate, with no erosion rate applied. The exposure ages are colour-coded according to the glacial system from which they are derived, and associated references can be found in Table 1.…”

Section: New Zealandmentioning

confidence: 99%

The timing and cause of glacial advances in the southern mid-latitudes during the last glacial cycle based on a synthesis of exposure ages from Patagonia and New Zealand

Darvill

Bentley

Stokes

et al. 2016

Quaternary Science Reviews

View full text Add to dashboard Cite

“…Ensuring that sample performance matches standard performance 16 during AMS analysis likely increases the accuracy of sample measurements, a prerequisite for 17 accurate determination of dates and rates across a variety of applications. Increasing the 18 precision of analyses enhances not only the interpretations that can be made from dates and rates, 19 but also enables approaches involving multiple isotopic systems such as burial dating (Granger 20 and Muzikar, 2001) and burial isochron dating (Balco and Rovey, 2008), and allows for 21 improved calibration of cosmogenic nuclide production rates (Balco et al, 2009;Borchers et al, 22 2015; Briner et al, 2012;Putnam et al, 2010). Very low concentration samples, such as those 23 from young exposures (Licciardi et al, 2009), rapidly eroding landscapes (Portenga et al, 2015), 1 or long-buried sediments (Erlanger et al, 2012;Gibbon et al, 2014), require low detection limits 2 to be measurable above background levels.…”

mentioning

confidence: 99%

An approach for optimizing in situ cosmogenic 10Be sample preparation

Corbett

Bierman

Rood

2016

Quaternary Geochronology

134

View full text Add to dashboard Cite

Optimizing sample preparation for the isotopic measurement of 10Be extracted from quartz mineral separates has a direct positive effect on the efficiency of sample production and the accuracy and precision of isotopic analysis. Here, we demonstrate the value of tracing Be throughout the extraction process (both after dissolution and after processing), producing pure Be (by optimizing column chromatography methods and quantifying quartz mineral separate purity), and minimizing backgrounds (through reducing both laboratory process blanks and 10B isobaric interference). These optimization strategies increase the amount of 10Be available for analysis during accelerator mass spectrometry (AMS), while simultaneously decreasing interference and contamination, and ensuring that sample performance matches standard performance during analysis. After optimization of our laboratory's extraction methodology, 9Be3+ beam currents, a metric for sample purity and Be yield through the extraction process, matched the 9Be3+ beam currents of AMS standards analyzed at the same time considering nearly 800 samples. Optimization of laboratory procedures leads to purer samples that perform better, more consistently, and more similarly to standards during AMS analysis, allowing for improved dating and quantification of Earth surface processes. February 2, 2016To the Editor:After performing the revisions suggested by two reviewers, we are resubmitting our manuscript, An Approach for Optimizing In Situ Cosmogenic 10 Be Sample Preparation, for publication in Quaternary Geochronology.We appreciated the comments from both reviewers and found that their suggestions improved the manuscript. In our revisions, we focused particular attention toward broadening our discussion of measurement accuracy, clarifying the impact of Ti impurities in samples, providing more information about beam current normalization, and benchmarking our methods against those previously used in our laboratory. As a group, we considered each suggestion and addressed it in the way that we thought most benefited the manuscript. In the following pages, you will find a list of the reviewers' suggestions and details about how we incorporated those suggestions.We are optimistic that our revisions have addressed the reviewers' concerns and that the manuscript has grown in both clarity and applicability. Thank you in advance for considering our revised draft. The paper of Corbett et al. describes in detail the chemical separation procedure for Be-10 in quartz samples applied at the University of Vermont. They show how their column chemistry was optimized for the purification of Be and they impressively demonstrate, on the statistical base of about 800 samples, that their lab constantly produces high quality Be-10 samples. This paper is important not only for newcomers in the field, e.g. who want to set up their own lab, but also for the existing cosmo labs because it demonstrates the importance of quality control e.g. to avoid systematic errors in the final Be-10 ages. D...

show abstract

In situ cosmogenic 10Be production-rate calibration from the Southern Alps, New Zealand

Cited by 249 publications

References 56 publications

Paleoglaciation of the Tibetan Plateau and surrounding mountains based on exposure ages and ELA depression estimates

Paleoglaciation of the Tibetan Plateau and surrounding mountains based on exposure ages and ELA depression estimates

The timing and cause of glacial advances in the southern mid-latitudes during the last glacial cycle based on a synthesis of exposure ages from Patagonia and New Zealand

An approach for optimizing in situ cosmogenic 10Be sample preparation

Contact Info

Product

Resources

About