Article
Geochemistry & Geophysics
Sean P. Gaynor, Melissa Ruiz, Urs Schaltegger
Summary: This study presents high-precision isotope dilution-thermal ionization mass spectrometry (ID-TIMS) U-Pb zircon data from the Carboniferous Punteglias granodiorite in Switzerland. The results show that the zircon crystals have a mixture of two different age components, and the crystallization age of the zircon is determined to be 335.479 +/- 0.041 Ma. Additionally, pretreating the zircon samples with physical and chemical abrasion reduces age dispersion and allows for a more accurate determination of the initial magmatic domains. The high analytical precision of this study is crucial for correctly interpreting complex age spectra.
Article
Geosciences, Multidisciplinary
Hugo K. H. Olierook, Christopher L. Kirkland, Milo Barham, Matthew L. Daggitt, Julie Hollis, Michael Hartnady
Summary: The study presents a technique to rapidly extract meaningful core model ages from core-rim mixtures, along with a Python-based program for easy application of this approach. The efficacy of the technique is demonstrated on a detrital sample from East Greenland, recovering dates of detrital cores from core-rim mixtures. Caution is advised against using this technique without checking the appropriateness of the underlying assumptions, and chemical means are provided for evaluating the assumptions.
Article
Chemistry, Analytical
Jia-Long Hao, Wei Yang, Sen Hu, Rui-ying Li, Jiang-Long Ji, Hitesh G. Changela, Yang-Ting Lin
Summary: This paper presents a novel Pb-Pb and U-Pb analytical method at a sub-micron scale using a NanoSIMS with a new RF ion source. The technique allows for high spatial resolution but may introduce depth effects, requiring adjustments in the scan area to eliminate mass fractionation. Results from zircon and lunar samples are in good agreement with reference ages within analytical uncertainties.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2021)
Article
Geochemistry & Geophysics
Jennifer Kasbohm, Blair Schoene, Darren F. Mark, Joshua Murray, Stephen Reidel, Dawid Szymanowski, Dan Barfod, Tiffany Barry
Summary: This study presents a detailed chronology of eruptions in the Columbia River Basalt Group (CRBG) using high-precision dating methods, which contributes to the understanding of the connection between volcanic activity and climate change during the Miocene Climate Optimum. The findings show a significant overlap between the main eruption phase of the CRBG and the highest sustained warmth of the MCO in astronomical records.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geology
Matthew Rioux, Joshua M. Garber, Michael Searle, James L. Crowley, Sally Stevens, Mark Schmitz, Andrew Kylander-Clark, Kayla Leal, Tyler Ambrose, Andrew J. Smye
Summary: High-precision dating of the metamorphic sole of ophiolites reveals insight into the tectonic evolution of ophiolites and subduction zone processes. The study on the metamorphic sole of the Samail ophiolite provides detailed information on the timing and temperature evolution of the metamorphic process.
JOURNAL OF METAMORPHIC GEOLOGY
(2023)
Article
Spectroscopy
Ya-Nan Yang, Miaohong He, Yan-Qiang Zhang, Yi-Gang Xu
Summary: NanoSIMS is a powerful instrument for Pb/Pb and U/Pb dating at the submicron scale. This study demonstrates that using O-16(2)- as the primary beam species and an RF oxygen ion source can significantly improve the precision and accuracy of the dating method.
ATOMIC SPECTROSCOPY
(2022)
Article
Geosciences, Multidisciplinary
Jian-Wei Zi, Stephen Sheppard, Janet R. Muhling, Birger Rasmussen
Summary: There is uncertainty about the nature and timing of magmatism, deformation, and metamorphism in the Paleoproterozoic Wisconsin magmatic terranes. New in situ U-Pb geochronology of igneous zircon reveals magmatic episodes synchronous with bimodal volcanism in the Wausau domain and Marshfield terrane. The study also identifies an overprinting metamorphic event related to the Yavapai-interval accretion.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geosciences, Multidisciplinary
Francis Chopin, Remi Lepretre, Mohamed El Houicha, Anne-Sophie Tabaud, Karel Schulmann, Jitka Mikova, Jocelyn Barbarand, Ryma Chebli
Summary: This paper presents new U-Pb geochronological data on granitoids from the Moroccan Meseta Variscan belt. The results show a peak of magmatic activity at 335.2 +/- 0.8 Ma in the Western Meseta and early Visean magmatic activity in the Eastern Meseta. The study also suggests a possible relationship between the magmatic activity and the tectonic events in Northwest Africa. Evaluation: 8 points.
Article
Geosciences, Multidisciplinary
M. H. Senger, J. H. F. L. Davies, M. Ovtcharova, N. Beukes, A. Gumsley, S. P. Gaynor, A. Ulianov, R. Ngobeli, U. Schaltegger
Summary: The Transvaal Supergroup in South Africa is an important rock formation for studying environmental changes in the late Archean and early Proterozoic. However, the sedimentation age of some stratigraphic intervals is still uncertain. To improve temporal control, U-Pb analyses were conducted on detrital zircons from different sedimentary units. The results provide new maximum depositional age estimates and highlight the importance of using multiple dating techniques for accurate age constraints. The data also offer insights into major fluctuations in atmospheric oxygen during this period, and further research is needed to explore the connections between glaciations and oxygen fluctuations.
PRECAMBRIAN RESEARCH
(2023)
Article
Chemistry, Analytical
Guo-Qi Liu, Kui-Dong Zhao, Thomas Ulrich, Wei Chen, Di Zhang, Qian Li, He-Dong Zhao, Rong-Qing Zhang, Fei Xia
Summary: The Isoclock software is developed for robust U-Pb dating of accessory minerals using LA-ICP-MS. It focuses on deducting common Pb from reference materials and provides a new common Pb correction method. The software allows the deduction of common Pb in 206Pb, 207Pb, and 208Pb, enabling U/Pb and Th/Pb age calculations. Isoclock has a user-friendly interface and is written in Python, making it versatile and accessible for researchers.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2023)
Article
Chemistry, Analytical
Hui-Qing Huang, Marcel Guillong, Yi Hu, Carl Spandler
Summary: The study reveals that laser focus variation can lead to systematic shifts in isotope data in different minerals, increasing uncertainty and decreasing reproducibility. Focus error may cause false discordance in data and impact data points on concordia plots.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2021)
Review
Geosciences, Multidisciplinary
Tiantian Wang, Jahandar Ramezani, Chuan Yang, Jianghai Yang, Qiong Wu, Zhihui Zhang, Dawei Lv, Chengshan Wang
Summary: Sedimentary rocks are important repositories of Earth history, and the U-Pb radioisotopic system is a precise and accurate method for measuring absolute time. However, its application to the stratigraphic record relies on the presence of relatively pure volcanic ash deposits. Innovations in U-Pb ID-TIMS geochronology have improved precision and reproducibility, but have also revealed complexities in the U-Pb systematics of minerals.
EARTH-SCIENCE REVIEWS
(2023)
Article
Multidisciplinary Sciences
Maria Herrmann, Ulf Soderlund, Anders Schersten, Tomas Naeraa, Sanna Holm-Alwmark, Carl Alwmark
Summary: The study analyzed U-Pb zircon data from granitoid rocks around the Siljan impact structure in Sweden, revealing that zircon grains within the structure experienced less radiogenic Pb loss compared to those outside. It is suggested that zircon in the central plateau of the structure remained crystalline due to continuous annealing, while zircon grains distal to the impact accumulated radiation damage. The research helps interpret variably discordant zircon data, indicating that the lower intercepts are likely recording fluid-assisted Pb loss from radiation-damaged zircon rather than regional magmatic or tectonic events.
SCIENTIFIC REPORTS
(2021)
Article
Geology
Alexandre Cugerone, Francoise Roger, Benedicte Cenki, Emilien Oliot, Jean-Louis Paquette
Summary: Research in the Boss`ost dome of the Pyrenean Axial Zone has shown that mineralization formation is controlled by Variscan tectonics and associated with a major Variscan remobilization event. The poly-magmatic and metamorphic events in the Pyrenean Axial Zone have unclear relationships with the mineralization.
ORE GEOLOGY REVIEWS
(2021)
Article
Geochemistry & Geophysics
Matthew Rioux, Joshua M. Garber, Michael Searle, Peter Kelemen, Sumio Miyashita, Yoshiko Adachi, Samuel Bowring
Summary: This study presents high-precision U-Pb zircon dates and Sm-Nd isotopic data from two late magmatic series in the Samail ophiolite in Oman and the United Arab Emirates, which reveal the tectonic development of the ophiolite. The results indicate a timeline of ophiolite formation during subduction initiation, involving initial sole metamorphism, crust formation through decompression-related magmatism, mantle melting related to subduction, and intrusion of slab-derived felsic dikes. The progression of magmatism in the ophiolite is consistent with predictions from geodynamic models of subduction initiation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geosciences, Multidisciplinary
Lily S. Pfeifer, Linda Hinnov, Christian Zeeden, Christian Rolf, Christian Laag, Gerilyn S. Soreghan
FRONTIERS IN EARTH SCIENCE
(2020)
Article
Geosciences, Multidisciplinary
Mehrdad Sardar Abadi, Gerilyn S. Soreghan, Linda Hinnov, Nicholas G. Heavens, James D. Gleason
Summary: Analysis of silicate minerals in shallow marine carbonates allows reconstruction of atmospheric dust loading and circulation during late Paleozoic ice ages. Dust flux increased during glacial times compared to interglacial times, with the Asselian interval showing higher dust flux reflecting more extreme icehouse conditions. Temporal changes in atmospheric dust loading varied at both glacial-interglacial and higher-frequency scales.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2021)
Article
Geography, Physical
Kunyuan Ma, Linda A. Hinnov, Xinsong Zhang, Yiming Gong
GLOBAL AND PLANETARY CHANGE
(2020)
Article
Geography, Physical
J. Fred Read, Mingsong Li, Linda A. Hinnov, Campbell S. Nelson, Steven Hood
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2020)
Article
Geochemistry & Geophysics
A. Abbassi, P. Cipollari, M. N. Zaghloul, D. Cosentino
Article
Geochemistry & Geophysics
Xiaojing Du, Ingrid Hendy, Linda Hinnov, Erik Brown, Jiang Zhu, Christopher J. Poulsen
Summary: The study on marine sediments from Santa Barbara Basin reveals a relationship between interannual precipitation variability in Southern California and ENSO over the past 9000 years. The findings suggest an increase in ENSO variability during the late Holocene and its connection with the tropical Pacific and extratropical climate. The role of the southward shift of the Intertropical Convergence Zone (ITCZ) and a deeper, westward-shifted Aleutian Low (AL) after 4.4 ka in strengthening the ENSO teleconnection between the tropical Pacific and Southern California is supported by CESM simulations.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geography
G. Mondati, M. Spadi, E. Gliozzi, D. Cosentino, F. Cifelli, G. P. Cavinato, M. Tallini, M. Mattei
Summary: The geological map of the north-eastern margin of the Fucino Basin reveals the transition between various environments characterized by Plio-Quaternary continental deposits. The new stratigraphic framework may help refine the estimation of slip rates along active normal faults in the area.
Article
Geosciences, Multidisciplinary
Simone Racano, Taylor F. Schildgen, Domenico Cosentino, Scott R. Miller
Summary: In geodynamically active areas, variations in rock uplift can be studied through quantitative analysis of river profiles, providing insights into the evolution of topography. Factors such as rock-uplift rate, erodibility of underlying rock, and climate affect fluvial landscapes, and river profiles can be inverted to determine the rock-uplift histories that created them. This study demonstrates how the spatio-temporal rock-uplift history of the CAP southern margin can be defined through analysis of river profiles.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2021)
Article
Geochemistry & Geophysics
Taylor F. Schildgen, Peter A. van der Beek, Mitch D'Arcy, Duna N. Roda-Boluda, Elizabeth N. Orr, Hella Wittmann
Summary: The migration of drainage divides, influenced by rock uplift and rainfall patterns, is an important factor in the geomorphic evolution of mountain ranges. This study focuses on the Sierra de Aconquija in northwest Argentina and uses low-temperature thermochronometric data to explore its topographic evolution. The findings indicate that westward drainage-divide migration, combined with faulting, played a dominant role in the range's evolution. These results provide new insights into the rates and magnitudes of drainage-divide migration in real landscapes and highlight the significance of considering this process when interpreting thermochronometer age patterns.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geosciences, Multidisciplinary
F. McNab, T. F. Schildgen, J. M. Turowski, A. D. Wickert
Summary: Alluvial rivers adjust their sediment-transport rates and form landforms such as river terraces in response to changing sediment and water supply. Using a model, we found that the likelihood of terrace formation is greater upstream and in shorter and/or wetter catchments. The evolution of sediment-transport rates depends on whether water or sediment supply is varied, leading to diverse responses to environmental change in alluvial valleys.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Simone Racano, Taylor Schildgen, Paolo Ballato, Cengiz Yildirim, Hella Wittmann
Summary: Major strike-slip fault systems, like the North Anatolian Fault (NAF), play a crucial role in accommodating plate motion, but little is known about their evolution. In the Central Pontides, the NAF has experienced transpression and crustal thickening, resulting in rock-uplift rates of 0.2-0.3 km/Myr. However, the exact onset of faster uplift phase associated with the NAF's development is poorly understood. This study presents the spatiotemporal pattern of rock-uplift rates in the Central Pontides, showing an increase in rates after 10 Ma, with peak rates occurring between 4 and 2 Ma.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Gerilyn S. Soreghan, Laurent Beccaletto, Kathleen C. Benison, Sylvie Bourquin, Georg Feulner, Natsuko Hamamura, Michael Hamilton, Nicholas G. Heavens, Linda Hinnov, Adam Huttenlocker, Cindy Looy, Lily S. Pfeifer, Stephane Pochat, Mehrdad Sardar Abadi, James Zambito
SCIENTIFIC DRILLING
(2020)
Article
Geography, Physical
Jurgen Mey, Mitch K. D'Arcy, Taylor F. Schildgen, David L. Egholm, Hella Wittmann, Manfred R. Strecker
QUATERNARY SCIENCE REVIEWS
(2020)
Article
Geography, Physical
Sara Savi, Stefanie Tofelde, Andrew D. Wickert, Aaron Bufe, Taylor F. Schildgen, Manfred R. Strecker
EARTH SURFACE DYNAMICS
(2020)