气候变化领域集成服务门户(CCPortal): An improved approach to age-modeling in deep time: Implications for the Santa Cruz Formation, Argentina

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DOI	10.1130/B35203.1
	An improved approach to age-modeling in deep time: Implications for the Santa Cruz Formation, Argentina
	Trayler R.B.; Schmitz M.D.; Cuitiño J.I.; Kohn M.J.; Bargo M.S.; Kay R.F.; Strömberg C.A.E.; Vizcaíno S.F.
发表日期	2020
ISSN	167606
起始页码	233
结束页码	244
卷号	132 期号:2021-01-02
英文摘要	Accurate age-depth models for proxy records are crucial for inferring changes to the environment through space and time, yet traditional methods of constructing these models assume unrealistically small age uncertainties and do not account for many geologic complexities. Here we modify an existing Bayesian age-depth model to foster its application for deep time U-Pb and 40Ar/39Ar geochronology. More flexible input likelihood functions and use of an adaptive proposal algorithm in the Markov Chain Monte Carlo engine better account for the age variability often observed in magmatic crystal populations, whose dispersion can reflect inheritance, crystal residence times and daughter isotope loss. We illustrate this approach by calculating an age-depth model with a contiguous and realistic uncertainty envelope for the Miocene Santa Cruz Formation (early Miocene; Burdigalian), Argentina. The model is calibrated using new, high-precision isotope dilution U-Pb zircon ages for stratigraphically located interbedded tuffs, whose weighted mean ages range from ca. 16.78 ± 0.03 Ma to 17.62 ± 0.03 Ma. We document how the Bayesian age-depth model objectively reallocates probability across the posterior ages of dated horizons, and thus produces better estimates of relative ages among strata and variations in sedimentation rate. We also present a simple method to propagate age-depth model uncertainties onto stratigraphic proxy data using a Monte Carlo technique. This approach allows us to estimate robust uncertainties on isotope composition through time, important for comparisons of terrestrial systems to other proxy records. © 2019 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184889
作者单位	Department of Geosciences, Boise State University, 1910 University Drive, Boise, ID 83725, United States; Department of Life and Environmental Sciences, University of California Merced, 5200 Lake Road, Merced, CA 95343, United States; Instituto Patagönico de Geología y Paleontología, CENPAT-CONICET, Boulevard Almirante Brown 2915, Chubut, Puerto Madryn, U9120ACD, Argentina; Divisiön Paleontología de Vertebrados, Museo de La Plata, Unidades de Investigaciön, Anexo Museo, Av. 60 y 122, La Plata, 1900, Argentina; Department of Evolutionary Anthropology, Trinity College and Division of Earth and Ocean Sciences, Nicholas School of the Environment, Duke University, DurhamNC 27708, United States; Department of Biology and Burke Museum of Natural History and Culture, University of Washington, Seattle, WA 98195, United States
推荐引用方式 GB/T 7714	Trayler R.B.,Schmitz M.D.,Cuitiño J.I.,et al. An improved approach to age-modeling in deep time: Implications for the Santa Cruz Formation, Argentina[J],2020,132(2021-01-02).
APA	Trayler R.B..,Schmitz M.D..,Cuitiño J.I..,Kohn M.J..,Bargo M.S..,...&Vizcaíno S.F..(2020).An improved approach to age-modeling in deep time: Implications for the Santa Cruz Formation, Argentina.Bulletin of the Geological Society of America,132(2021-01-02).
MLA	Trayler R.B.,et al."An improved approach to age-modeling in deep time: Implications for the Santa Cruz Formation, Argentina".Bulletin of the Geological Society of America 132.2021-01-02(2020).