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
Geology
Claude Nambaje, Ian S. Williams, K. Sajeev
Summary: The SIMS U-Th-Pb dating technique has provided direct measurements of the ages of cassiterite in pegmatite and quartz vein Sn mineralisation in the Karagwe-Ankole Belt, Rwanda. The study identified three generations of Sn mineralisation associated with magmatic and metamorphic processes during different periods of Rodinian and Gondwanan assembly, helping to place the mineralisation in a tectonic context. The recognition of different Sn mineralisation episodes and their links to local geological settings, igneous activity and regional tectonism will aid in exploration for ore-grade Sn deposits in Rwanda and neighboring countries.
ORE GEOLOGY REVIEWS
(2021)
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
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
Geology
Alejandro Piraquive, Andreas Kammer, Matthias Bernet, Thomas Cramer, Albrecht von Quadt, Cristhian Gomez
Summary: The Sierra Nevada de Santa Marta Massif in the Northern Andes provides insights into the structural evolution of the lower crust through a series of tectono-metamorphic events. These events, revealed through geological dating and geochemical analysis, have shaped the complex crustal section of the region, highlighting the tectonic processes that have occurred over millions of years.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Computer Science, Interdisciplinary Applications
Ruby C. Marsden, Christopher L. Kirkland, Martin Danisik, Matthew L. Daggitt, Ung-San Ahn, Bjarne Friedrichs, Noreen J. Evans
Summary: A new analytical and data reduction workflow for zircon U-Th disequilibrium analysis using SHRIMP II was developed in this study, with a case study on trachytic samples from Jeju Island demonstrating the effectiveness of the new approach.
COMPUTERS & GEOSCIENCES
(2022)
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
Chemistry, Analytical
Liang-Liang Zhang, Di-Cheng Zhu, Jin-Cheng Xie, Qing Wang, Sandra Kamo, Heriberto Rochin-Banaga, Yang Xiao
Summary: This study successfully identifies a new natural megacryst calcite reference material TARIM for in situ U-Pb isotope measurement by LA-ICPMS analysis. TARIM calcite can be applied as a reference material for calcite LA-ICPMS U-Pb dating.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2023)
Article
Geosciences, Multidisciplinary
Carol Dehler, Mark Schmitz, Abigail Bullard, Susannah Porter, Mike Timmons, Karl Karlstrom, Hannah Cothren
Summary: The upper Tonian ChUMP strata in the southwestern U.S.A provide valuable information on the regional rift basin evolution and late Tonian Earth systems. The U-Pb CA-ID-TIMS dating of detrital zircon grains confirms the correlation and provides insights into sedimentation rates, biological events, and potential glaciation during this time period.
PRECAMBRIAN RESEARCH
(2023)
Article
Geochemistry & Geophysics
Craig Robert Walton, Heejin Jeon, Ana Cernok, Auriol S. P. Rae, Ioannis Baziotis, Fengzai Tang, Venkata S. C. Kuppili, Ludovic Ferrierej, James Darling, Sen Hu, Martin J. Whitehouse, Mahesh Anand, Oliver Shorttle
Summary: The thermal history of asteroids can be understood through the radioisotopic ages of meteorites. This study presents new in-situ apatite U-Pb ages for nine L chondrite meteorites, expanding the age record and providing evidence for different stages in the thermal evolution of the L chondrite parent asteroid. The results also suggest a single parent asteroid for most L chondrites, which has been disturbed to form an asteroid family.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Multidisciplinary Sciences
Louise Shewan, Dougald O'Reilly, Richard Armstrong, Phillip Toms, John Webb, Nancy Beavan, Thonglith Luangkhoth, Jamie Wood, Sian Halcrow, Kate Domett, Julie Van den Bergh, Nigel Chang
Summary: The megalithic jar sites in Laos, also known as the Plain of Jars, are one of the most mysterious archaeological cultures in Southeast Asia. Recent research has revealed that these stone jars may have been placed on the landscape as early as the late second millennium BC, and radiocarbon dating suggests that ritual activities around the jars continued from the 9-13th century AD.
Article
Geosciences, Multidisciplinary
Suo-Fei Xiong, Shao-Yong Jiang, Zuo-Hao Chen, Jian-Xin Zhao, Ying Ma, Di Zhang, Zhen-Peng Duan, Pan-Pan Niu, Yao-Ming Xu
Summary: The ages of Zn-Pb deposits have been difficult to determine due to the lack of appropriate mineral chronometers and techniques. However, the use of in situ LA-ICP-MS U-Pb dating of carbonates and barite has allowed for the determination of ages for a Mississippi Valley-type Zn-Pb deposit in South China, shedding light on its mineralization history.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geology
Lei Jiang, Anjiang Shen, Zichen Wang, Anping Hu, Yongsheng Wang, Xianying Luo, Feng Liang, Karem Azmy, Liyin Pan
Summary: This article examines different types of dolomite from three Neoproterozoic dolostone profiles in China and proposes a diagenetic model explaining the decrease in iron and manganese concentrations during dolomitization. The study questions the use of widespread Neoproterozoic fibrous dolomite cements in paleoclimate reconstruction and as evidence for the "dolomite sea" hypothesis.
Article
Geosciences, Multidisciplinary
Shuo Wang, Yunhua Liu, Benzhao Yang, Le Tan, Xiaoyan LI, Nan Deng
Summary: The Xiejiaba and Fuqiangbei plutons are part of the Neoproterozoic Niushan complex in the southern South Qinling belt. They provide insights into Neoproterozoic tectonism within the South Qinling belt, with similar composition and emplacement at 750-711 Ma. The magmas that formed these plutons were derived from the crust-mantle boundary, indicating a period of late subduction and backarc extension in the region, which constrains the timing of subduction within the South Qinling belt and the northern Yangtze Block to 750-711 Ma.
ACTA GEOLOGICA SINICA-ENGLISH EDITION
(2023)
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.