A large-scale copper ore-forming event accompanying rapid uplift of the southern Tibetan Plateau: Evidence from zircon SHRIMP U–Pb dating and LA ICP-MS analysis

Qu, Xiaoming; Hou, Zhiyuan; Zaw, Khin; Mo, Xuanxue; Xu, Wei; Hongbo, Xin

doi:10.1016/j.oregeorev.2009.04.001

Cited by 21 publications

(5 citation statements)

References 42 publications

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“…For the registration of both mass spectra high purity aluminium auxiliary cathode was used. The main difference is the presence of signals of 238 U 16 O + (m/z ¼ 80.2 9.5 6.5 1.9 1.9…”

Section: Methods Optimisationmentioning

confidence: 99%

“…That is related to high efficacy of UO 2 sputtering due to formation of the surface conducting layer. 22 The presence of oxide cluster 238 U 16 O + is caused by oxygen atomisation from the sample. Notably, relative oxygen concentration in the gaseous phase (O/U ratio) considerably exceeds that one in the solid sample as lifetime of oxygen atom in the discharge is much longer than that of uranium.…”

Section: Methods Optimisationmentioning

confidence: 99%

“…21 In particular, GDMS with direct current discharge cell was used for the determination of neptunium in sea sludge with the precision of 10-15% and below ppt detection limit. 23 The interference of 181 Ta 40 Ar 16 O + on 237 Np + was resolved in this case by employing of medium mass resolution (1700). However, such low detection limits are accessible only for a few heavy elements under single element registration, prolonged acquisition times and low resolution and that is unsuitable for the medium and light atomic mass elements due to multiple spectral interferences.…”

Section: Introductionmentioning

confidence: 94%

“…16 To improve limits of detection helium was used instead of argon as transporting gas. 16 To improve limits of detection helium was used instead of argon as transporting gas.…”

Section: Introductionmentioning

confidence: 99%

“…LA-ICP-MS was used for the geochronological analysis of magmatic rocks using lead to uranium ratio in zircon mineral originating from South Tibetan Plateau. 16 To improve limits of detection helium was used instead of argon as transporting gas. For the elements lighter than zinc limits of detection were in the range 0.1-1.0 ppm, whereas for heavier elements, in particular, U, Nd, Sm, Dy, Yb, Hf and Pb they were at the level of 0.011-0.032 ppm.…”

Section: Introductionmentioning

confidence: 99%

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Direct determination of uranium and thorium in minerals by time-of-flight mass spectrometry with pulsed glow discharge

et al. 2015

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A direct method of uranium and thorium determination in non-conducting geological samples using timeof-flight mass spectrometry with pulsed glow discharge was proposed. The following rock specimens were analysed: metamict zircon, metamict rinkite, metamict samarskite (Y-Fe-niobate), pyrochlore and jacinth.For sample sputtering a combined hollow cathode cell of high purity aluminium or tantalum hollow cathodes was used. Powdered or monolith samples were pressed into the surface of the powdered metal prior to analysis. Model samples (artificial mixtures of oxides) were proposed for calibration; additionally, relative sensitivity factors, internal standardisation and standard additions were employed.For validation, IAEA artificially prepared uranium ore reference material was analysed. For additional validation, the obtained results for real mineral samples were compared to the results of inductively coupled plasma optical emission spectrometry after sample dissolution and semi-quantitative data of energy dispersive X-ray spectrometry. Limits of detection (3s) for the designed method were 0.3 ppm for uranium and 0.5 ppm for thorium, which is comparable to laser ablation inductively coupled plasma mass spectrometry. The method was also tested for capability to measure isotope ratios for lead and uranium without specific isotope calibration. Acquired isotopic ratios of uranium and lead corresponded to their natural abundances within the experimental error.

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“…For the registration of both mass spectra high purity aluminium auxiliary cathode was used. The main difference is the presence of signals of 238 U 16 O + (m/z ¼ 80.2 9.5 6.5 1.9 1.9…”

Section: Methods Optimisationmentioning

confidence: 99%

Section: Methods Optimisationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

“…16 To improve limits of detection helium was used instead of argon as transporting gas. 16 To improve limits of detection helium was used instead of argon as transporting gas.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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