Long-term repeatability and interlaboratory reproducibility of high-precision ID-TIMS U–Pb geochronology

Schaltegger, Urs; Ovtcharova, Maria; Gaynor, Sean P.; Schoene, Blair; Wotzlaw, Jörn Frederik; Davies, Joshua; Farina, Felicia; Greber, Nicolas D.; Szymanowski, Dawid; Chelle-Michou, Cyril

doi:10.1039/d1ja00116g

Cited by 49 publications

(34 citation statements)

References 53 publications

(42 reference statements)

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“…Powder tablets were prepared from 10 samples to determine the mineral composition by X-ray powder diffraction (see Table 1). 7 Lithosphere problematic, as discussed recently in Schaltegger et al [85]. Schaltegger et al [85] present an ID-TIMS 206 Pb/ 238 U age of 600:28 ± 0:16 Ma (2σ).…”

Section: Whole Rock Geochemistry and Xrdmentioning

confidence: 84%

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Geochronology, Geochemistry, and Geodynamic Implications of Permo-Triassic Back-Arc Basin Successions in the North Pamir, Central Asia

et al. 2022

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The Permo-Triassic period marks the time interval between Hercynian (Variscan) orogenic events in the Tien Shan and the North Pamir, and the Cimmerian accretion of the Gondwana-derived Central and South Pamir to the southern margin of the Paleo-Asian continent. A well-preserved Permo-Triassic volcano-sedimentary sequence from the Chinese North Pamir yields important information on the geodynamic evolution of Asia’s pre-Cimmerian southern margin. The oldest volcanic rocks from that section are dated to the late Guadalupian epoch by a rhyolite and a dacitic dike that gave zircon U-Pb ages of ~260 Ma. Permian volcanism was largely pyroclastic and mafic to intermediate. Upsection, a massive ignimbritic crystal tuff in the Chinese Qimgan valley was dated to 244.1±1.1 Ma, a similar unit in the nearby Gez valley to 245±11 Ma, and an associated rhyolite to 233.4±1.1 Ma. Deposition of the locally ~200 m thick crystal tuff unit follows an unconformity and marks the onset of intense, mainly mafic to intermediate, calc-alkaline magmatic activity. Triassic volcanic activity in the North Pamir was coeval with the major phase of Cimmerian intrusive activity in the Karakul-Mazar arc-accretionary complex to the south, caused by northward subduction of the Paleo-Tethys. It also coincided with the emplacement of basanitic and carbonatitic dikes and a thermal event in the South Tien Shan, to the north of our study area. Evidence for arc-related magmatic activity in a back-arc position provides strong arguments for back-arc extension or transtension and basin formation. This puts the Qimgan succession in line with a more than 1000 km long realm of extensional Triassic back-arc basins known from the North Pamir in the Kyrgyz Altyn Darya valley (Myntekin formation), the North Pamir of Tajikistan and Afghanistan, and the Afghan Hindukush (Doab formation) and further west from the Paropamisus and Kopet Dag (Aghdarband, NE Iran).

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Section: Whole Rock Geochemistry and Xrdmentioning

confidence: 84%

“…7 Lithosphere problematic, as discussed recently in Schaltegger et al [85]. Schaltegger et al [85] present an ID-TIMS 206 Pb/ 238 U age of 600:28 ± 0:16 Ma (2σ). This is in agreement with our measurement.…”

Section: Whole Rock Geochemistry and Xrdmentioning

confidence: 84%

Geochronology, Geochemistry, and Geodynamic Implications of Permo-Triassic Back-Arc Basin Successions in the North Pamir, Central Asia

et al. 2022

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“…Schaltegger et al 158 evaluated the use of solutions used as references for U–Pb geochronology by ID-TIMS . Solution ET100 was tested with different TIMS instruments, but no significant differences were found between the results from different instruments.…”

Section: Isotope Analysismentioning

confidence: 99%

Atomic spectrometry update: review of advances in atomic spectrometry and related techniques

Evans

Pisonero

Smith

et al. 2022

J. Anal. At. Spectrom.

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“…where 𝑝̅ expresses a mean value of the data set, and the symbol n expresses the samples. The gauge of repeatability and reproducibility (R&R) shows the measurement's deviation [14][15][16]. The purpose of gauging R&R is to evaluate the accuracy of the measurement system and the personnel operation.…”

Section: Principle Of Detected Debris On the Tft-lcdmentioning

confidence: 99%

Non-Contact Optical Detection of Foreign Materials Adhered to Color Filter and Thin-Film Transistor

2022

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This paper describes the non-contact optical detection of debris material that adheres to the substrates of color filters (CFs) and thin-film transistors (TFTs) by area charge-coupled devices (CCDs) and laser sensors. One of the optical detections is a side-view illumination by an area CCD that emits a coherency light to detect debris on the CF. In contrast to the height of the debris material, the image is acquired by transforming the geometric shape from a square to a circle. As a result, the side-view illumination from the area CCD identified the height of the debris adhered to the black matrix (BM) as well as the red, green, and blue of a CF with 95, 97, 98, and 99% accuracy compared to the golden sample. The uncertainty analysis was at 5% for the BM, 3% for the red, 2% for the green, and 1% for the blue. The other optical detection, a laser optical interception with a horizontal alignment, inspected the material foreign to the TFT. At the same time, laser sensors intercepted the debris on the TFT at a voltage of 3.5 V, which the five sets of laser optics make scanning the sample. Consequently, the scanning rate reached over 98% accuracy, and the uncertainty analysis was within 5%. Thus, both non-contact optical methods can detect debris at a 50 μm height or lower. The experiment presents a successful design for the efficient prevention of a valuable component malfunction.

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Long-term repeatability and interlaboratory reproducibility of high-precision ID-TIMS U–Pb geochronology

Abstract: Age determination of minerals using the U-Pb technique is widely used to quantify time in Earth’s history. A number of geochronology laboratories produce the highest precision U-Pb dates employing the...

Cited by 49 publications

References 53 publications

Geochronology, Geochemistry, and Geodynamic Implications of Permo-Triassic Back-Arc Basin Successions in the North Pamir, Central Asia

Geochronology, Geochemistry, and Geodynamic Implications of Permo-Triassic Back-Arc Basin Successions in the North Pamir, Central Asia

Atomic spectrometry update: review of advances in atomic spectrometry and related techniques

Non-Contact Optical Detection of Foreign Materials Adhered to Color Filter and Thin-Film Transistor

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