气候变化领域集成服务门户(CCPortal): Mass 47 clumped isotope signatures in modern lacustrine authigenic carbonates in Western China and other regions and implications for paleotemperature and paleoelevation reconstructions

CCPortal

DOI	10.1016/j.epsl.2021.116840
	Mass 47 clumped isotope signatures in modern lacustrine authigenic carbonates in Western China and other regions and implications for paleotemperature and paleoelevation reconstructions
	Li H.; Liu X.; Arnold A.; Elliott B.; Flores R.; Kelley A.M.; Tripati A.
发表日期	2021
ISSN	0012821X
卷号	562
英文摘要	With the development of the carbonate clumped isotope (Δ47) geothermometer, many Δ47–temperature calibrations based on biogenic and abiogenic carbonates have been generated in recent years. However, there is still not a robust empirical calibration relationship derived from lacustrine authigenic carbonates that can be used to calculate lake water temperatures from Δ47 values. In this study, we present a new calibration dataset that is comprised of measurements of the clumped isotope composition of 33 lacustrine authigenic carbonates collected from terminal lakes primarily in Western China that cover a substantial altitudinal gradient, and 5 samples from other regions. These data allow us to directly derive a temperature calibration for lacustrine authigenic carbonates. Our results show a robust correlation between modern lacustrine authigenic carbonate clumped isotope composition (Δ47carb) values and independently measured mean summer water surface temperatures (Twater) (ranging from 9.8 to 26.0 °C), which confirms the utility of mass-47 clumped isotope measurements of lacustrine authigenic carbonates as a lake water temperature indicator and allows for the derivation of the following calibration equation: Δ47carb (‰) = 0.0521 ± 0.0071 × 106/Twater2 (K) + 0.0904 ± 0.0870 (R2 = 0.6224, P < 0.0001, n = 33). We observe that Δ47carb is significantly correlated to lake elevation at 35°N from 270 to 5,156 m a.s.l. The change in Δ47–derived water temperature differences through elevation gradients (i.e. lapse rate) is around 3.2 °C/km. We do not observe a significant correlation between Δ47carb and carbonate oxygen isotopic composition or independently measured lake surface water oxygen isotopic composition. Additionally, in our dataset, we find that water chemistry, carbonate precipitation rate, carbonate content and mineral-specific differences do not significantly affect Δ47carb values. Hence, the mass-47 clumped isotope signal of lacustrine authigenic carbonate can be used in paleotemperature and paleoaltimetry studies if post-depositional diagenesis did not modify the isotopic composition. © 2021 Elsevier B.V.
关键词	clumped isotope lacustrine authigenic carbonate paleoaltimetry paleoclimate paleotemperature reconstruction
英文关键词	Calibration; Carbonates; Carbonation; Lakes; Oxygen; Temperature; Authigenic carbonates; Calibration equations; Carbonate precipitation; Empirical calibration; Lake water temperature; Oxygen isotopic composition; Temperature calibration; Water surface temperature; Isotopes; altimetry; authigenesis; carbonate rock; isotopic analysis; isotopic composition; lacustrine environment; paleoclimate; paleotemperature; reconstruction; China; Indicator indicator
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203183
作者单位	College of Resource Environment and Tourism, Capital Normal University, Beijing, 100048, China; Department of Earth, Planetary, and Space Sciences, Department of Atmospheric and Oceanic Sciences, Institute of the Environment and Sustainability, Center for Diverse Leadership in Science, University of California, Los Angeles, CA 90095, United States; European Institute of Marine Sciences (IUEM), Université de Brest, UMR 6538, Domaines Océaniques, Rue Dumont D'Urville, Plouzané, 29280, France; IFREMER, Laboratoire Géophysique et enregistrement Sédimentaire, Plouzané, 29280, France
推荐引用方式 GB/T 7714	Li H.,Liu X.,Arnold A.,et al. Mass 47 clumped isotope signatures in modern lacustrine authigenic carbonates in Western China and other regions and implications for paleotemperature and paleoelevation reconstructions[J],2021,562.
APA	Li H..,Liu X..,Arnold A..,Elliott B..,Flores R..,...&Tripati A..(2021).Mass 47 clumped isotope signatures in modern lacustrine authigenic carbonates in Western China and other regions and implications for paleotemperature and paleoelevation reconstructions.Earth and Planetary Science Letters,562.
MLA	Li H.,et al."Mass 47 clumped isotope signatures in modern lacustrine authigenic carbonates in Western China and other regions and implications for paleotemperature and paleoelevation reconstructions".Earth and Planetary Science Letters 562(2021).