238U, 235U and 234U in seawater and deep-sea corals: A high-precision reappraisal

Kipp, Michael A.; Li, Haoyu; Ellwood, Michael J.; John, Seth G.; Middag, Rob; Adkins, Jess F.; Tissot, F. L. H.

doi:10.1016/j.gca.2022.09.018

Cited by 20 publications

(4 citation statements)

References 108 publications

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“…Cobalt-rich ferromanganese crusts (GBW07337, 07338, 07339) and polymetallic nodules (GBW07249, GBW07295, 07296) yield the lowest δ 238/235 U values: averaging at -0.62 AE 0.02‰ (2s), and -0.54 AE 0.03‰ (2s), respectively. These values are within the range of published global ferromanganese crusts (Weyer et al 2008, Goto et al 2014, confirming that δ 238/235 U values of ferromanganese sediments are consistently and systematically lower than the seawater value -0.379 AE 0.023‰ (95% CI) (Kipp et al 2022) by ∼ 0.2‰. Compared with the cobalt-rich ferromanganese crusts, the polymetallic nodules yield slightly higher δ 238/235 U values, which can be ascribed to isotopically heavier detrital minerals residing in the cores of polymetallic nodules, which is supported by the higher SiO 2 , Al 2 O 3 mass-fractions and Th/U ratio.…”

Section: Uranium Isotopic Ratios Of Sedimentary Rocks and Sedimentssupporting

confidence: 84%

“…2016), confirming that δ 238/235 U values of ferromanganese sediments are consistently and systematically lower than the seawater value ‐0.379 ± 0.023‰ (95% CI) (Kipp et al . 2022) by ∼ 0.2‰. Compared with the cobalt‐rich ferromanganese crusts, the polymetallic nodules yield slightly higher δ 238/235 U values, which can be ascribed to isotopically heavier detrital minerals residing in the cores of polymetallic nodules, which is supported by the higher SiO 2 , Al 2 O 3 mass‐fractions and Th/U ratio.…”

Section: Resultsmentioning

confidence: 82%

“…The blue and grey vertical bars represent modern seawater δ 238/235 U NBL CRM 112a (‐0.379 ± 0.023‰, 95% CI) and continental crust δ 238/235 U NBL CRM 112a (‐0.29 ± 0.03‰, 95% CI), respectively (Tissot and Dauphas 2015, Kipp et al . 2022).…”

Section: Resultsmentioning

confidence: 99%

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Uranium Isotope Ratios of Twenty‐nine Geological Rock Reference Materials Measured by MC‐ICP‐MS

Wang

et al. 2023

Geostandard Geoanalytic Res

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Uranium isotope ratios are reported for twenty‐nine geological reference materials (RMs) including igneous, metamorphic and sedimentary rocks, as well as sediments. Measurements were conducted on a multi‐collector inductively coupled plasma‐mass spectrometer (MC‐ICP‐MS) using the 233U‐236U double spike technique. These RMs possess a wide range of matrices with U mass fractions ranging from 0.11 μg g‐1 to 18.7 μg g‐1. The δ234/238U values (relative to the n(234U)/n(238U) ratio at secular equilibrium) show minor fluctuations around the secular equilibrium value except for two Pleistocene speleothem RMs. The δ238/235U values (relative to the value for NBL CRM 112a (NBS SRM 960)) of igneous rocks and metamorphic rocks are within the range of the continental crust value (‐0.29 ± 0.03‰, 95% CI). The δ238/235U value for sedimentary rock and sediment RMs spans a wide range of 0.98‰, suggesting significant 238U/235U isotopic fractionation in low temperature environments. The range of δ238/235U RMs reported in this study (‐0.63‰ to 0.35‰) exceeds that of previous RMs (‐0.61‰ to 0.17‰), allowing inter‐laboratory calibration of wider ranges of geological and environmental samples.

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Section: Uranium Isotopic Ratios Of Sedimentary Rocks and Sedimentssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 82%

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Uranium Isotope Ratios of Twenty‐nine Geological Rock Reference Materials Measured by MC‐ICP‐MS

Wang

et al. 2023

Geostandard Geoanalytic Res

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“…Improvements in mass spectrometry technology have led to enhanced precision and lower detection limits that have strengthened understanding of a variety of natural and man-made processes from the micro to the macro scale. [32][33][34][35][36][37] For bulk sample analysis, two types of mass spectrometers are typically used. Thermal ionization mass spectrometry (TIMS) has been considered the conventional method with decades of supporting method development and high precision analytical data using either partial or total evaporation methods.…”

Section: Introductionmentioning

confidence: 99%