Article
Geochemistry & Geophysics
Jian-Wei Zi, Birger Rasmussen, Janet R. Muhling, Ian R. Fletcher
Summary: Zircon U-Pb geochronology is crucial for calibrating the geologic timescale. This study found that zircon grains in the Brockman Iron Formation yielded ages younger than the host sedimentary rock. In situ U-Pb dating techniques were used to directly analyze zircon crystals, and the results were consistent with independent age constraints. The study also discovered that young zircon dates could be attributed to hydrothermal alteration.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
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
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
Geosciences, Multidisciplinary
Harald Luetzner, Marion Tichomirowa, Alexandra Kaessner, Reinhard Gaupp
Summary: Acidic Stephanian to early Permian volcanic rocks and intercalated sediments accumulated in Thuringian Forest Basin in central Germany, with high-precision U-Pb CA-ID-TIMS zircon data obtained for the first time. The duration of volcanic activity in TFB was found to be considerably shorter than previously thought, leading to a reevaluation of the sedimentary record timeframe.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2021)
Review
Geosciences, Multidisciplinary
Michael Crow, Khin Zaw, Kyaw Thu, Ivan Belousov, Karsten Goemann
Summary: The Mogok Metamorphic Belt in Myanmar consists of low- and high-metamorphic grade metasediments and igneous intrusions. The detrital zircon U-Pb stratigraphy of high-grade metasediments in the Mogok area is comparable to the Neoproterozoic-Palaeozoic sequence on the Shan Plateau. This study reveals the precursor stratigraphy of the high-grade metasediments and provides important clues for the geological evolution of the Mogok region.
EARTH-SCIENCE REVIEWS
(2023)
Article
Geosciences, Multidisciplinary
Elizabeth J. Catlos, Darren F. Mark, Stephanie Suarez, Michael E. Brookfield, C. Giles Miller, Axel K. Schmitt, Vincent Gallagher, Anne Kelly
Summary: The Ludlow Bone Bed and Downton Bone Bed were analyzed for zircon grains using SIMS and CA-ID-TIMS methods, revealing sedimentation ages ranging from middle Ordovician to late Devonian. These findings contribute valuable insights into the early evolution of animal and plant life.
JOURNAL OF THE GEOLOGICAL SOCIETY
(2021)
Article
Geology
Haonan Zhao, Kunyue Ling, Shengjiang Du, Hanjie Wen
Summary: The base of the Upper Permian Heshan Formation in Pingguo County, Guangxi Province, SW China, consists of a lower Nb-rich bauxite layer and an upper Li-rich claystone layer. The sources of these layers may be related to volcanic rocks and volcanic ash.
ORE GEOLOGY REVIEWS
(2023)
Article
Geography, Physical
Serhiy D. Buryak, Alberto V. Reyes, Britta J. L. Jensen, Joshua H. F. L. Davies, John A. Westgate, S. Andrew DuFrane, Yan Luo, Duane G. Froese, D. Graham Pearson, Jeff A. Benowitz
Summary: Tephrochronology is an effective method for correlating and dating Quaternary deposits. Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) zircon U-Pb dating is a reliable technique for determining the ages of key tephra beds in the Yukon and Alaska regions.
QUATERNARY GEOCHRONOLOGY
(2022)
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
Geosciences, Multidisciplinary
Guichun Liu, Zaibo Sun, Jianwei Zi, M Santosh, Tianyu Zhao, Qinglai Feng, Guangyan Chen, Xiaomei Nie, Jing Li, Shitao Zhang
Summary: The recently identified Mayidui and Wanhe ophiolitic melanges in southwest Yunnan represent ancient oceanic crust and sediments, formed in Middle Ordovician. Geochemical analysis shows that these ophiolites were likely formed in an intra-oceanic setting with MORB-like and E-MORB-type mantle sources, providing robust constraints on the nature and timing of their formation.
GEOSCIENCE FRONTIERS
(2021)
Article
Geosciences, Multidisciplinary
Yuhui Feng, Tao Yang, Fei Liang, Ge Sun
Summary: The new U-Pb dating results of rhyolite samples collected in the Late Triassic Tianqiaoling flora-bearing beds provide important chronological evidence for the development of the flora, which is consistent with paleobiological evidence. This contributes to a better understanding of the geology and phytogeography in East Asia during the Late Triassic period.
SCIENCE CHINA-EARTH SCIENCES
(2021)
Article
Geology
Qin Ye, Hanjie Wen, Chongguang Luo, Yu Chen, Wenxiu Yu, Yi Cui
Summary: A lithium-rich claystone with great potential for lithium exploration has been discovered in Central Yunnan, China. However, the origin of the claystone is still being debated. Through various analyses, it was found that the age distribution and source of the claystone differ. It is suggested that the weathering products from the Weining Formation may have provided the primary material for the Daoshitou Formation claystone.
ORE GEOLOGY REVIEWS
(2023)
Article
Geosciences, Multidisciplinary
Gang Lu, Mingxing Gou, Guanglin Liu, Changcheng Wang, Zhiqiang Shi
Summary: The study of volcanic tuff layers in the Yanchang Formation of the Ordos Basin revealed a prolonged volcanic activity period from the Late Triassic Ladinian to Carnian, providing insights into the tectonic evolution and sedimentary processes of the region.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geology
Lijian Shen, Licheng Wang, Chenglin Liu
Summary: The age of the Mengyejing potash deposit in China has been a subject of debate. This study used detrital zircon U-Pb dating to determine the depositional age of the potash layers as mid-Cretaceous, confirming previous findings.
ORE GEOLOGY REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Anfisa V. Skoblenko, Kirill E. Degtyarev, Nadezhda A. Kanygina, Andrey A. Tretyakov, Sergey Yu Skuzovatov, Kwan-Nang Pang, Hao-Yang Lee
Summary: The Precambrian metamagmatic complexes in the Zhingeldy and Kendyktas blocks of the Zheltau and ChuKendyktas terranes are composed of predominantly Neoproterozoic orthogneisses and subordinate metamorphic rocks. The presence of Precambrian metavolcanic rocks and metasedimentary complexes in the region further indicate the evolution and composition of the studied terranes. The findings also help with the correlation of metamorphic complexes in the SW part of the Central Asian Orogenic Belt.
Article
Geosciences, Multidisciplinary
Satoshi Yoshida, Akira Ishikawa, Shogo Aoki, Tsuyoshi Komiya
Summary: This study investigates the origin of some of the world's oldest carbonate rocks in the Eoarchean Nulliak supracrustal rocks in the Saglek Block of northeastern Labrador, Canada, and estimates the surface environmental conditions of the early Earth based on their occurrence and geochemistry. The geological occurrence of these carbonate rocks suggests formation around hydrothermal fields and near a continental margin.
Article
Geosciences, Multidisciplinary
Inna Safonova, Alina Perfilova, Olga Obut, Pavel Kotler, Shogo Aoki, Tsuyoshi Komiya, Bo Wang, Min Sun
Summary: This paper presents U-Pb detrital zircon ages, geochemical data, and Nd-Hf isotope data from sandstones of eastern Kazakhstan, suggesting a juvenile character of igneous rocks in the provenance and a derivation from one or more intra-oceanic arcs. The data from eastern Kazakhstan support the existence of an extended Pacific-type subduction system in the western Paleo-Asian Ocean during the Devonian-early Carboniferous time.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2022)
Article
Astronomy & Astrophysics
Gael Choblet, Gabriel Tobie, Arnaud Buch, Ondrej Cadek, Laura M. Barge, Marie Behounkova, Eloi Camprubi, Caroline Freissinet, Matt Hedman, Geraint Jones, Valery Lainey, Alice Le Gall, Alice Lucchetti, Shannon MacKenzie, Giuseppe Mitri, Marc Neveu, Francis Nimmo, Karen Olsson-Francis, Mark Panning, Frank Postberg, Joachim Saur, Juergen Schmidt, Yasuhito Sekine, Takazo Shibuya, Christophe Sotin, Ondrej Soucek, Cyril Szopa, Tomohiro Usui, Steven Vance, Tim Van Hoolst
Summary: Enceladus has the potential to support life, with direct sampling revealing the possibility of habitability. Future missions involving advanced instruments and sample return are needed to further investigate the potential emergence of life on this intriguing moon.
EXPERIMENTAL ASTRONOMY
(2022)
Article
Geochemistry & Geophysics
Sakiko Kikuchi, Takazo Shibuya, Mariko Abe, Katsuyuki Uematsu
Summary: The presence of hydrous minerals in carbonaceous chondrites provides important evidence for the existence of liquid water in parent asteroids. This study conducted experiments and calculations to investigate the alteration process and secondary mineral assemblages of chondritic rock. The results suggest that water-rock reactions at low temperatures may be responsible for the formation of secondary minerals, and the findings have implications for understanding the evolution of water in early solar system bodies.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Biology
Xing Wang, Jean Vannier, Xiaoguang Yang, Lucas Leclere, Qiang Ou, Xikun Song, Tsuyoshi Komiya, Jian Han
Summary: Although there is little direct information available on the muscle systems of early animals, this study describes exceptionally preserved muscles in benthic olivooid medusozoans from the basal Cambrian, providing the oldest record of a muscle system in cnidarians. These muscles likely helped early Cambrian jellyfish to develop jet-propelled swimming within the water column.
Article
Geosciences, Multidisciplinary
Motoko Igisu, Yuichiro Ueno, Tsuyoshi Komiya, Stanley M. Awramik, Yuka Ikemoto, Ken Takai
Summary: Raman and Fourier-transform infrared (FTIR) microspectroscopic analyses were conducted on organic-walled microfossils and organic matter in a black chert nodule from the Ediacaran Doushantuo Formation in China. The analyses revealed the presence of diverse microorganisms and various organic functional groups, providing clues for the taxonomy of microfossils of unknown origin.
PRECAMBRIAN RESEARCH
(2022)
Article
Geochemistry & Geophysics
A. Ardoin, M. W. Broadley, M. Almayrac, G. Avice, D. J. Byrne, A. Tarantola, A. Leblanc, T. Saito, T. Komiya, T. Shibuya, B. Marty
Summary: Noble gases, specifically xenon, have been used as tracers to investigate physical processes over geological timescales. The isotopic composition of xenon has evolved until the Great Oxidation Event, after which it appeared to cease. Investigating xenon trapped in hydrothermal quartz from different formations around the Great Oxidation Event, the researchers found that xenon isotope fractionation stopped during a specific time window, coinciding with the disappearance of mass-independent fractionation of sulfur isotopes in the region. This finding suggests a connection between the rise in atmospheric oxygen and the cessation of xenon isotope fractionation.
GEOCHEMICAL PERSPECTIVES LETTERS
(2022)
Article
Geochemistry & Geophysics
Jian-Qiang Liu, Li-Hui Chen, Xiao-Jun Wang, Xiao-Yu Zhang, Gang Zeng, Saskia Erdmann, David T. Murphy, Kenneth D. Collerson, Tsuyoshi Komiya, Lukas Krmicek
Summary: The study further examines the petrogenesis of Gaussberg lamproites using new Mg and Zn isotopic data, suggesting a source from recycled crustal materials containing sedimentary carbonates rather than post-magmatic alteration or crustal contamination. The involvement of subducted dolomite in the source of the lamproites can explain their anomalous Mg and Zn isotopic values.
Article
Geosciences, Multidisciplinary
Yusuke Sawaki, Hisashi Asanuma, Shuhei Sakata, Mariko Abe, Takeshi Ohno
Summary: Detrital zircons show high resistance to alteration, allowing them to retain valuable information about their formation ages and parental magmas over time. By analyzing trace-element compositions of zircons in different types of granites, researchers can distinguish between M-, I-, S-, and A-type granites based on specific ratios such as Nb/P, Ta/P, Ce/P, Ce/Nd, as well as Sc/Yb ratios and Eu anomaly. These findings provide insights into the origins and characteristics of zircons in granitic rocks.
Article
Multidisciplinary Sciences
Xiao-Yu Zhang, Li-Hui Chen, Xiao-Jun Wang, Takeshi Hanyu, Albrecht W. Hofmann, Tsuyoshi Komiya, Kentaro Nakamura, Yasuhiro Kato, Gang Zeng, Wen-Xian Gou, Wei-Qiang Li
Summary: Researchers have confirmed that ancient superficial carbonates were transported into the deep mantle billions of years ago by analyzing lavas from St. Helena Island in the Atlantic and Cook-Austral Islands in the Pacific.
NATURE COMMUNICATIONS
(2022)
Article
Astronomy & Astrophysics
Yuki Hibiya, Tsuyoshi Iizuka, Hatsuki Enomoto, Takehito Hayakawa
Summary: In this study, the niobium-zirconium (Nb-Zr) isochron dating of Northwest Africa (NWA) 6704 is presented, which formed about 4562.76 million years ago with an initial Nb-92/Nb-93 ratio of (2.72 +/- 0.25) x 10(-5). This ratio is approximately 80% higher than values obtained from meteorites formed in the inner disk, suggesting that a significant proportion of solar Nb-92 was produced by a nearby core-collapse supernova (CCSN) and that the outer disk was more enriched in CCSN ejecta. The findings highlight the importance of NWA 6704 in mapping relative Nb-Zr ages of objects in the outer solar system onto the absolute timescale.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Yukio Isozaki, Yusuke Sawaki, Hideki Iwano, Takafumi Hirata, Keitaro Kunugiza
Summary: This study analyzes the geochemistry and U-Pb age of zircons in the large granitoid boulders in the Jinzu Group in order to identify the origin of the Hida belt in central Japan. The results suggest that these boulders have typical A-type granite geochemistry and a Late Triassic age of approximately 220 Ma. The boulders are more likely to originate from the Hida belt rather than the eastern Songliao block in China, indicating the past occurrence of A-type granite in the Hida belt.
Review
Geosciences, Multidisciplinary
Takazo Shibuya, Ken Takai
Summary: This study proposes a new hypothesis for the origin of life, suggesting that liquid/supercritical CO2 (L/SC-CO2) in the seafloor hydrothermal systems of Hadean Earth may have played a crucial role in prebiotic chemical evolution, overcoming the water paradox.
PROGRESS IN EARTH AND PLANETARY SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Yusuke Sawaki, Hisashi Asanuma, Shuhei Sakata, Mariko Abe, Takeshi Ohno
Summary: Zircon is an important mineral for geochronologic research, and its isotopic ratios and trace elements can provide information about parent magmas. In this study, the researchers focused on sediment involvement during granitoid formation and found that the Nb/P and Ta/P ratios in zircon can be used as indicators of sediment incorporation. Additionally, the Yb/Gd ratios and Ce/P contents in zircon respond to sediment involvement.
Article
Paleontology
Qing-Qin Tang, Ya-Juan Zheng, Song Qin, Yin-Chu Wang, Xiao-Guang Yang, Xing Wang, Jie Sun, Kentaro Uesugi, Tsuyoshi Komiya, Jian Han
Summary: The Kuanchuanpu biota from the basal Cambrian in South China has provided valuable insights into the divergent evolution of animal phyla in the early Cambrian ocean. In this study, a new taxon of calathiform alga, Calathophycus irregulatus Tang gen. et sp. nov., and an indeterminate alga were reported from the Kuanchuanpu biota, indicating a certain diversity of algae at the beginning of the Cambrian. The findings also suggest the need for reevaluation of spherical fossils previously interpreted as animal embryo cleavage stages.
ACTA PALAEONTOLOGICA POLONICA
(2022)
