Breakthrough of 2‐ to 3‐μm scale U–Pb zircon dating using Cameca IMS‐1280HR SIMS

Liu, Yu; Li, Xian‐Hua; Li, Qiuli; Tang, Guoqiang

doi:10.1002/sia.6752

Cited by 9 publications

(4 citation statements)

References 18 publications

(51 reference statements)

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“…The primary beam setting is described in detail in ref. 39 . The multi-collector mode with five electron multipliers with low noise (less than 0.001 cps, especially for L2) was used to measure 204 Pb + (L2), 206 Pb + (L1), 207 Pb + (C), 208 Pb + (H1) and 96 Zr 2 16 O 2 + (H2).…”

Section: Methodsmentioning

confidence: 99%

Two-billion-year-old volcanism on the Moon from Chang’e-5 basalts

Zhou

Liu

et al. 2021

Nature

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223

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The Moon has a magmatic and thermal history that is distinct from that of the terrestrial planets1. Radioisotope dating of lunar samples suggests that most lunar basaltic magmatism ceased by around 2.9–2.8 billion years ago (Ga)2,3, although younger basalts between 3 Ga and 1 Ga have been suggested by crater-counting chronology, which has large uncertainties owing to the lack of returned samples for calibration4,5. Here we report a precise lead–lead age of 2,030 ± 4 million years ago for basalt clasts returned by the Chang’e-5 mission, and a 238U/204Pb ratio (µ value)6 of about 680 for a source that evolved through two stages of differentiation. This is the youngest crystallization age reported so far for lunar basalts by radiometric dating, extending the duration of lunar volcanism by approximately 800–900 million years. The µ value of the Chang’e-5 basalt mantle source is within the range of low-titanium and high-titanium basalts from Apollo sites (µ value of about 300–1,000), but notably lower than those of potassium, rare-earth elements and phosphorus (KREEP) and high-aluminium basalts7 (µ value of about 2,600–3,700), indicating that the Chang’e-5 basalts were produced by melting of a KREEP-poor source. This age provides a pivotal calibration point for crater-counting chronology in the inner Solar System and provides insight on the volcanic and thermal history of the Moon.

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Section: Methodsmentioning

confidence: 99%

Two-billion-year-old volcanism on the Moon from Chang’e-5 basalts

Zhou

Liu

et al. 2021

Nature

Self Cite

223

128

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“…Using recent SIMS dating techniques with a small primary beam size of ≤5 lm (Liu et al, 2011(Liu et al, , 2020Yang et al, 2012;Zhang et al, 2019;Zhou et al, 2013), (Jolliff et al, 2000;Xu et al, 2021). KREEP is an acronym for potassium, rare earth elements (RREs), and phosphorus.…”

Section: Introductionmentioning

confidence: 99%

“…Using recent SIMS dating techniques with a small primary beam size of ≤5 μm (Liu et al., 2011, 2020; Yang et al., 2012; Zhang et al., 2019; Zhou et al., 2013), micro‐zircon‐bearing lunar rocks can be dated with high precision. In this study, we use NanoSIMS (nanoscale secondary ion mass spectrometry) to date micro‐zircons (<20 μm) in two lunar feldspathic meteorites, Dhofar 1528 and Dhofar 1627, providing the first geochronological records for these two meteorites.…”

Section: Introductionmentioning

confidence: 99%

SIMS U‐Pb dating of micro‐zircons in the lunar meteorites Dhofar 1528 and Dhofar 1627

Zhang,

Lin,

Hao

et al. 2023

Meteorit & Planetary Scien

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About half of the lunar meteorites in our collections are feldspathic breccias. Acquiring geochronologic information from these breccias is challenging due to their low radioactive‐element contents and their often polymict nature. We used high‐spatial‐resolution (5 μm) NanoSIMS (nanoscale secondary ion mass spectrometry) U‐Pb dating technique to date micro‐zircons in the lunar feldspathic meteorites Dhofar 1528 and Dhofar 1627. Three NanoSIMS dating spots of two zircon grains from Dhofar 1528 show a discordia with an upper intercept at 4354 ± 76 Ma and a lower intercept at 332 ± 1407 Ma (2σ, MSWD = 0.01, p = 0.91). Three spots of two zircon grains in Dhofar 1627 define a discordia with an upper intercept at 3948 ± 30 Ma and a lower intercept at 691 ± 831 Ma (2σ, MSWD = 0.40, p = 0.53). Both samples likely experienced shock metamorphism caused by impacts. Based on the clastic nature, lack of recrystallization and the consistent U‐Pb and Pb‐Pb dates of the zircons in Dhofar 1528, the U‐Pb date of 4354 Ma is interpreted as the crystallization age of its Mg‐suite igneous precursor. Some of the Dhofar 1627 zircons show poikilitic texture, a crystallization from the matrix impact melt, so the U‐Pb date of 3948 Ma corresponds to an impact event, likely the Imbrium basin‐forming event. These data are the first radiometric ages for these two meteorites and demonstrate that in situ (high spatial resolution) U‐Pb dating has potential for extracting geochronological information about igneous activities and impact events from lunar feldspathic and polymict breccias.

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“…For example, the combination of micro-X-ray fluorescence (μXRF), 3D X-ray microscopy (XRM), and scanning electron microscopy (SEM) has supported the rapid screening and positioning of Zrbearing minerals for U-Pb dating. 17 The high spatial resolution U-Pb dating method 18 by secondary ion mass spectrometry (SIMS) makes it possible to determine the crystallization age of tiny (< 5 μm) Zr-bearing minerals in CE-5 basalt. 7 The Sr-Nd isotopic methods 19−21 using laser ablation-inductively coupled plasmamass spectrometry (LA-ICP-MS) obtained key evidence for the non-KREEP origin of CE-5 basalt.…”

mentioning

confidence: 99%