Cosmogenic in carbonate rocks

Handwerger, D.; Cerling, Thure E.; Bruhn, Ronald L.

doi:10.1016/s0169-555x(98)00087-7

Cited by 35 publications

(23 citation statements)

References 28 publications

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“…The ability to document the exposure, transport and burial of sediment in fluvial systems over timescales of 10 3 -10 6 yr opens up a whole suite of possibilities for developing an understanding of drainage basin processes over the timescales relevant to significant landscape change (Granger, 2002). Particularly valuable for addressing the more recent part of this time range will be the wider use of in-situ-produced 14 C (Jull et al, 1989(Jull et al, , 1992(Jull et al, , 1994bHandwerger et al, 1999;Lal and Jull, 2001). Recent technical advances (Lifton et al, 2001; are now making it possible to pair this short-lived radioisotope with cosmogenic nuclides with much longer half-lives in order to provide far more sensitivity in the detection of complex exposure histories.…”

Section: Discussionmentioning

confidence: 99%

Geomorphological applications of cosmogenic isotope analysis

Cockburn

Summerfield

2004

Progress in Physical Geography: Earth and Environment

148

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Cosmogenic isotope analysis involves the measurement of cosmogenic nuclides that have accumulated in the upper few metres of the Earth's surface as a result of interactions between cosmic rays and target elements. The concentrations of these cosmogenic nuclides can provide quantitative estimates of the timing and rate of geomorphic processes. In dating applications the concentration of cosmogenic nuclides is interpreted as reflecting the time elapsed since a surface exposure event. However, over most of the Earth's surface for most of the time the landsurface experiences incremental denudation and in these circumstances cosmogenic nuclide concentrations are related to the rate of denudation. Applications of event dating using cosmogenic isotopes include constructional landforms such as volcanic and depositional features, fault displacement, meteorite impacts, rapid mass movement, bedrock surfaces rapidly eroded by fluvial or wave action or exposed by glacial retreat, and the burial of sediment or ice. Strategies for quantifying rates of incremental change include estimates of denudation rates from site-specific samples and from fluvial sediment samples reflecting catchment-wide rates, and measurements of cosmogenic nuclide concentrations in soils and regolith to quantify rates of rock weathering. The past decade has seen a rapid growth in applications of cosmogenic isotope analysis to a wide range of geomorphological problems, and the technique is now playing a major role in dating and quantifying rates of landscape change over timescales of several thousands to several millions of years.

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Section: Discussionmentioning

confidence: 99%

Geomorphological applications of cosmogenic isotope analysis

Cockburn

Summerfield

2004

Progress in Physical Geography: Earth and Environment

148

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“…Braucher et al, 2005), and 1 4 C 2 (e.g. Handwerger et al, 1999) in travertine deposits which are well-exposed to cosmic rays.…”

Section: Travertine Depositionmentioning

confidence: 99%

“…This in situ cosmogenic 1 4 C must be distinguished from 4 C originating from the atmosphere and other sources, such as biological material. Handwerger et al (1999) argued that this can be done by cryogenic separation methods. However, further work is needed to refine the techniques in their preliminary study.…”

Section: Travertine Depositionmentioning

confidence: 99%

Determining timescales of natural carbonation of peridotite in the Samail Ophiolite, Sultanate of Oman

Mervine¹

2012

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Abstract:Determining timescales of the formation and preservation of carbonate alteration products in mantle peridotite is important in order to better understand the role of this potentially important sink in the global carbon cycle and also to evaluate the feasibility of using artificially-enhanced, in situ formation of carbonates in peridotite to mitigate the buildup of anthropogenic CO 2 emissions in the atmosphere. Timescales of natural carbonation of peridotite were investigated in the mantle layer of the Samail Ophiolite, Sultanate of Oman. Rates of ongoing, low-temperature CO 2 uptake were estimated through 14 C and 2 3 0Th dating of carbonate alteration products. Approximately 1-3 x 106 kg C0 2 /yr is sequestered in Ca-rich surface travertines and approximately 107 kg C0 2 /yr is sequestered in Mg-rich carbonate veins. Rates of CO 2 removal were estimated through calculation of maximum erosion rates from cosmogenic 3He measurements in partiallyserpentinized peridotite bedrock associated with carbonate alteration products. Maximum erosion rates for serpentinized peridotite bedrock are -5 to 180 m/Myr (average: -40 m/Myr), which removes at most 105-106 kg CO 2 /yr through erosion of Mg-rich carbonate veins. 3 DedicationI would like to dedicate my thesis to James "The Amazing" Randi, who taught me to think critically about the world around me and who reminds me that a PhD only means that I know a great amount about very little 4 Acknowledgments:First and foremost, I give my deepest thanks to my WHOI advisor Susan Humphris. Susan was an excellent mentor and role model, and she supported me through many difficult time periods and transitions during the course of my PhD journey. In the midst of an incredibly busy schedule, Susan always made time for me. Time and again, she went above and beyond the normal obligations of a PhD advisor. She even flew all the way to Muscat, Oman for three days to help me prepare for a conference presentation. Susan always pushed me to do my very best work, and she made sure that I had the support and resources that I needed in order to do my best work. I have no doubt that without Susan's mentorship I would not be here today, submitting my PhD thesis. Susan's support over the years has been invaluable.I also owe sincere thanks to my co-advisor Ken Sims. When I decided to leave my first PhD project, Ken immediately offered to take me on as a student. When I asked if it would be possible for me to work in the Samail Ophiolite, Ken helped me develop a collaboration with Peter Kelemen and wrote grants to support the new research project. Even after Ken moved from WHOI to the University of Wyoming, he continued to support my work and even brought me out to Laramie for a summer. Ken flew back to WHOI numerous times to help me finish my PhD, and he endured many long Skype calls of my questions.I also owe thanks to my PhD committee members, particularly Peter Kelemen. Peter was excited and supportive when I expressed my desire to work in the Samail Ophiolite, and he helped me develop th...

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“…It may seem that measurement of 14 C will be foiled by the incorporation of dissolved 14 C from seawater and the ubiquitous presence of organic matter in corals. However, in situ 14 C forms mostly 14 CO (Lal et al, 2000;Lal and Jull, 2001), making it possible to distinguish the in situ 14 C from seawater 14 C and organic matter 14 C, which would be extracted in the form of 14 CO 2 (Handwerger et al, 1999).…”

Section: Production Rates Of Useful Cosmogenic Radionuclides In Coralsmentioning

confidence: 99%