Interactive programs of MC-ICPMS data processing for 230Th/U geochronology

Shao, Qingfeng; Li, Chunhua; Huang, Mengjie; Liao, Zebo; Arps, Jennifer; Huang, Chun-Ying; Chou, Y. T.; Kong, Xinggong

doi:10.1016/j.quageo.2019.01.004

Cited by 51 publications

(20 citation statements)

References 42 publications

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“…We carried out the U-series analysis directly on the Harbin cranium. Sample preparation followed that of Shao et al 36 The U and Th isotopic measurements were performed on an MC-ICPMS (Thermo Fisher Neptune) in Nanjing Normal University. It is equipped with nine Faraday cups and a secondary electron multiplier (SEM).…”

Section: U-series Analysismentioning

confidence: 99%

Geochemical provenancing and direct dating of the Harbin archaic human cranium

Shao

et al. 2021

The Innovation

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Unsystematic recovery of the Harbin fossil cranium and a long history since the discovery impede its accurate dating -Geochemical analyses, including non-destructive X-ray fluorescence, rare earth elements, and the strontium isotopes, suggest that the fossil cranium was from a bed of lacustrine sediments aged between 138 and 309 thousand years ago in the Harbin region -Uranium-series disequilibrium dating directly on the cranium suggests that the cranium is older than 146 thousand years ll www.cell.com/the-innovation

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Section: U-series Analysismentioning

confidence: 99%

Geochemical provenancing and direct dating of the Harbin archaic human cranium

Shao

et al. 2021

The Innovation

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“…U and Th were preconcentrated by coprecipitation with iron hydroxide and then separated from each other and from other cations by passing the sample solution through a U-TEVA resin column. The U/Th fractions were then dried and diluted in a mixture of 0.1N HNO 3 and 0.01N HF for isotopic analysis by a multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS, Neptune) at the School of Geography, Nanjing Normal University, using the methods described in Shao et al (2019). The U isotopic data were acquired by two static sequences.…”

Section: Site Materials and Methodsmentioning

confidence: 99%

East Asian summer monsoon climates and cave hydrological cycles over Dansgaard-Oeschger events 14 to 11 revealed by a new stalagmite record from Hulu Cave

Liang

Wang

et al. 2019

Quat. res.

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A 230Th/U-dated stalagmite from Hulu Cave was analyzed for δ18O, δ13C, and trace elements. A ~10-yr-resolution δ18O record, spanning 51.7–42.6 ka, revealed Dansgaard-Oeschger (DO) events 14 to 11. A similar rapid transition and synchronous timing of the onset of DO 12 is evident between the Greenland and Hulu Cave records, which suggests a common forcing mechanism of DO cycles in the North Atlantic and monsoonal region of Asia. Centennial-scale monsoonal oscillations in the cave δ18O record are indicative of hydroclimatic instability during interstadials. After removing the signals of remote moisture sources, the proportion of moisture from nearby sources is found to be higher during stadials than during interstadials. To explain this, we propose that the movement of the westerly jet is an important control on the balance of nearby and distant moisture sources in East Asia. In addition, the records of δ13C and trace element ratios, which are proxies of local environmental changes, resemble the δ18O record on the scale of DO cycles, as well as on even shorter timescales. This suggests that hydrological processes and biological activity at the cave site respond sensitively to the monsoonal changes.

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“…By introducing Eqs. ( 9), ( 10) and (11) in Eqs. ( 7) and ( 8), the ( Y Z/ B E)S ratio relative uncertainty (ur[( Y Z/ B E)S]) can be expressed as a function of λ and κ (Eq.…”

Section: Simultaneous Optimization Of λ and κ Parameters For A Spike Solution Prepared From Two Crmsmentioning

confidence: 99%

“…In geochemistry, isotopes ratios like 230 Th/ 238 U or 226 Ra/ 238 U help identifying and characterize the contamination sources [7][8][9]. It can also be useful to date geological objects [10][11][12][13]. These applications require measuring these ratios with the best possible accuracy (i.e.…”

Section: Introductionmentioning

confidence: 99%