Article
Geosciences, Multidisciplinary
R. M. Flowers, P. K. Zeitler, M. Danisik, P. W. Reiners, C. Gautheron, R. A. Ketcham, J. R. Metcalf, D. F. Stockli, E. Enkelmann, R. W. Brown
Summary: The field of (U-Th)/He geochronology and thermochronology has experienced significant growth over the past 25 years. However, there is currently a lack of universally agreed upon protocols for reporting data and uncertainties. This study aims to address these issues and provides recommendations to enhance the reliability and cross-laboratory comparison of (U-Th)/He data.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geochemistry & Geophysics
Rachel E. Havranek, Rebecca M. Flowers
Summary: The study analyzed zircon (U-Th)/He(ZHe) data from Proterozoic basement samples in the Front Range of Colorado, revealing the thermal history of the ancient crust. It found that the northern part of the range had higher burial temperatures during the Late Cretaceous to Eocene, while the central and southern regions showed older sedimentary characteristics.
Article
Geosciences, Multidisciplinary
Jian Chang, Xin Yang, Nansheng Qiu, Kyoungwon Min, Chenxing Li, Huili Li, Dan Li
Summary: This study provides a new strategy for thermal history reconstruction of the Tarim Basin using zircon (U-Th)/He thermochronology, revealing the complex and long-term thermal histories in different regions and clarifying the thermal evolution process of the ancient strata in the Tarim Basin.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Benjamin Gerard, Xavier Robert, Djordje Grujic, Cecile Gautheron, Laurence Audin, Matthias Bernet, Melanie Balvay
Summary: In this study, new zircon (U-Th)/He (ZHe) ages and zircon fission track (ZFT) ages were analyzed from an age-elevation profile in Machu Picchu, Peru. The ZFT data showed older ages compared to other thermochronological data, while the ZHe data interestingly showed ages similar to apatite (U-Th)/He (AHe). It was proposed that He retention in zircon is linked to the damage dose, with a closure temperature that varies with alpha-dose. The study suggests that the closure temperature of ZHe at low alpha-dose ranges from 6 x 10(15) to 4 x 10(16) alpha/g, and is lower than previously thought. These findings strengthen previous geological conclusions and highlight a cooling rate at Machu Picchu that is approximately twice as important as deduced from AHe and apatite fission track data alone.
Article
Geochemistry & Geophysics
Camila Pineda, Axel K. Schmitt, Diego Morata
Summary: Zircon is a widely studied mineral for geochronology, and its Th/U ratios play a critical role in isochron dating and radiometric age correction. However, the processes causing Th/U variations in zircon crystals are not fully understood. This study presents new data on the Th/U ratios and ages of zircon from a volcanic eruption in central Chile, providing important insights into the factors influencing Th/U ratios in zircon.
Article
Geochemistry & Geophysics
Yongsheng Wang, Qiao Bai, Weiwei Ma, Juanhao Yang, Zhensheng Li
Summary: The Zhangbaling tectonic belt is one of the most representative tectonic belts in East China, and it has experienced uplift and is crucial for understanding the tectonic uplift and topographical evolution of East China and East Asia. The study reveals that the belt had thrust activity in the mid-Cretaceous and formed a watershed after 30 Ma.
Article
Geochemistry & Geophysics
EmilyE. Zawacki, Matthijs C. van soest, Kip V. Hodges, Jennifer J. Scott, Melanie Barboni, Manfred R. Strecker, Craig S. Feibel, Christopher J. Campisano, J. Ramon Arrowsmith
Summary: Detrital zircons from two major rift basins in the East African Rift System are analyzed to understand sediment provenance, landscape dynamics, and the volcanic evolution of the rift system. The results show that the sediments mainly come from silicic volcanic rocks, and the zircon ages correspond to the timing of rift activity. The discrepancy between (U-Th)/He and U/Pb ages of zircons may be related to late volcanic and/or hydrothermal activity.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
William R. Guenthner
Summary: Radiation damage plays a crucial role in controlling He diffusion in zircon, leading to correlations between (U-Th)/He dates and effective uranium concentration. The integration of alpha damage annealing kinetics into the ZRDAAM model shows that lower temperatures result in slightly younger model dates, while higher uranium concentrations lead to older dates. These differences are most pronounced in thermal histories with extended periods at low temperatures.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geochemistry & Geophysics
Weibin Zhang, Fei Wang, Lin Wu, Liekun Yang, Xibin Tan, Wenbei Shi, Xiwei Xu
Summary: The study of Taibai Mountain on the southern margin of the western North China Craton reveals a rapid exhumation phase around 78-71 Ma, indicating the possible Late-Cretaceous margin reactivation. This reactivation may have been driven by WNW-ESE extension in East Asia related to thermo-tectonic events, basin subsidence, and volcanism.
Review
Geochemistry & Geophysics
Cecile Gautheron, Mathias Hueck, Sebastien Ternois, Beatrix Heller, Stephane Schwartz, Philippe Sarda, Laurent Tassan-Got
Summary: The development and application of (U-Th)/He dating method has greatly improved the understanding of geological processes such as exhumation and burial in the continental crust, as well as continental evolution. Recent advancements in the method have expanded its range of applications to higher temperature geological problems.
Article
Geography, Physical
Ingrid A. Ukstins, Jo-Anne Wartho, Nathalie A. Cabrol, Edmond A. Grin, Matthijs C. van Soest, Marc B. Biren, Kip Hodges, Guillermo Chong
Summary: Single-crystal (U-Th)/He dating of 32 apatite and zircon crystals from an impact breccia in the Monturaqui impact structure in Chile yielded a weighted mean age of 663 +/- 28 ka. Numerical modeling showed that even in small craters like Monturaqui, the short-lived compressional stage and shock metamorphic stage can explain the observed partial to full resetting of (U-Th)/He ages in accessory minerals.
QUATERNARY GEOCHRONOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Sofia Laskari, Konstantinos Soukis, Daniel F. Stockli, Stylianos Lozios, Alexandra Zambetakis-Lekkas
Summary: In the Attic-Cycladic Crystalline Complex of the Aegean Sea, Greece, extensional tectonics resulted in the denudation of the upper plate, and this study reveals the similarities between the Amorgos Unit and the Santorini Detachment System Pelagonian hanging wall.
Article
Geochemistry & Geophysics
Alice Recanati, Nistor Grozavu, Younes Bennani, Cecile Gautheron, Yves Missenard
Summary: This study investigates the impact of various parameters on apatite (U Th Sm)/He (AHe) thermochronological dates using advanced data mining techniques. By excluding the influence of other parameters on helium retention, it is concluded that the chemistry and crystal dimensions of apatite do not significantly affect helium retention or AHe date dispersion. The research suggests that machine learning has the potential to correct errors or detect anomalies in predicting AHe dates.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Adam M. Forte, Kate R. Gutterman, Matthijs C. van Soest, Kerry Gallagher
Summary: This study investigates the tectonic mechanisms of the Greater Caucasus Mountains and concludes that the topography of the range is mainly shaped by traditional models of accretion, thickening, and uplift, without the need for additional slab-related mechanisms.
Editorial Material
Geochemistry & Geophysics
Olgeir Sigmarsson
Summary: This paper discusses the origin of silicic magmas at Hekla volcano and compares two different explanations. The authors argue that the dacite at Hekla volcano is formed through dehydration melting of altered basaltic crust, a model that can explain most of the observed results so far.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2023)
Article
Geosciences, Multidisciplinary
Jianping Zhou, Istvan Dunkl, Yongjiang Liu, Weimin Li, Hilmar von Eynatten
Summary: This study evaluates and investigates the thermal evolution of basins and basement horsts in the eastern area of the Songliao basin, NE China. By utilizing low-T thermochronology and thermal modelling, the research reveals the post Jurassic thermal history of the basement highs and the basin remnants. The results show that the basement highs are younger than the Early Cretaceous sedimentary record in the satellite basins, and the major basin inversion caused significant erosion. Additionally, the study suggests the formation of a single down-warped basin in the Early Cretaceous, followed by gradual exhumation and erosion of the sedimentary cover.
Review
Geology
Ioan Seghedi, Theodoros Ntaflos, Zoltan Pecskay, Cristian Panaiotu, Viorel Mirea, Hilary Downes
Summary: The Apuseni Mts. area is significant for studying the interaction between intra-continental tectonics, sedimentation, and magmatism. From approximately 14.5 to 7 million years ago, a series of tectonic events and magmatic activities occurred, resulting in diverse geological features, including graben systems and volcanic formations.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geochemistry & Geophysics
L. Li Vigni, C. Cardellini, M. Temovski, A. Ionescu, K. Molnar, L. Palcsu, A. L. Gagliano, S. Cappuzzo, W. D'Alessandro
Summary: Duvalo volcano is a site of anomalous geogenic degassing close to Ohrid (North Macedonia) not related to volcanic activity. The gases at Duvalo mainly consist of CO2, with significant concentrations of H2S and CH4. These gases originate mostly, if not exclusively, in the shallowest part of the crust, and their production is influenced by seismic activity and tectonic structures in the area.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geochemistry & Geophysics
Ruby C. Marsden, Martin Danisik, Axel K. Schmitt, Kai Rankenburg, Marcel Guillong, Ung-San Ahn, Christopher L. Kirkland, Noreen J. Evans, Olivier Bachmann, Tommaso Tacchetto, Bradley J. McDonald, Hugo K. H. Olierook
Summary: U-Th disequilibrium dating method is commonly used to date zircon crystallization in volcanic and plutonic rocks, but the lack of suitable reference materials under 350 ka has been a challenge. This study introduces zircon SS14-28 from Jeju Island, South Korea as a potential reference material, with analysis showing consistent results across different laboratories. The proposed age of 82 +/- 6 ka is calculated based on a combined isochron gradient, demonstrating the accuracy and repeatability of the U-Th disequilibrium dating method.
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
(2022)
Article
Geography, Physical
Viktor Karadi, Tamas Budai, Janos Haas, Attila Voros, Olga Piros, Istvan Dunkl, Emoke Toth
Summary: The study of the Middle Triassic K 'ad'arta section in the western Transdanubian Range of Hungary provides insights into the drowning of an isolated carbonate platform and the subsequent pelagic sedimentation. Biostratigraphic and radiometric ages reveal a gap between shallow-marine carbonates and deep-water successions, indicating the area's paleotopographic changes after the late Pelsonian period.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geochemistry & Geophysics
Ioan Seghedi, Viorel M. Mirea, Gabriel C. Stefan
Summary: The Bontau Volcano in the Miocene Zarand extensional basin is the largest composite volcano in the Apuseni Mountains. It has undergone complex geological processes and has a unique structure and composition. The volcano has experienced multiple eruptive and collapse events, resulting in the formation of extensive volcanic debris deposits. The study of the volcano provides insights into the geotectonic evolution and magma evolution processes, as well as the formation of mineral deposits within the volcano.
Article
Geosciences, Multidisciplinary
Cornelius O. Schwarze, Jenni L. Hopkins, Sonja Storm, Alan Orpin, Axel K. Schmitt, Nina Kukowski
Summary: This study provides important evidence for the history of activity in the Taupo over bar Volcanic Zone (TVZ) in New Zealand's North Island through the analysis of volcanic ash deposits in MeBo200 sediment cores, including both known and newly discovered tephra layers. This is significant for studying volcanic activity and chronostratigraphic correlation of marine sediment layers.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Arturo Martin-Barajas, Axel K. Schmitt, Bodo Weber, Margarita Lopez-Martinez
Summary: Pleistocene subaerial volcanism in the northern Gulf of California is represented by two young dacite dome complexes, Isla Coronado and Lobera volcanic complex. The eruption ages of these volcanoes were determined using single crystal zircon U-Pb crystallization ages, and they are estimated to be between 250 and 1000 thousand years ago. The trace elements in the Pleistocene zircon indicate a continental affinity, suggesting crustal assimilation involving tonalitic basement.
REVISTA MEXICANA DE CIENCIAS GEOLOGICAS
(2022)
Article
Geology
Gursel Sunal, Ali Akin, M. Korhan Erturac, Cemre Ay, Istvan Dunkl
Summary: The Almacik Block is a tectonic sliver formed during the activity of the North Anatolian Fault Zone. The study analyzes magmatic rocks using the zircon U-Pb method and examines the palaeo-exhumation evolutions of different tectonic zones using the zircon (U-Th)/He technique.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geochemistry & Geophysics
Reinhard Wolff, Kyra Hoelzer, Ralf Hetzel, Qiang Xu, Istvan Dunkl, Aneta A. Anczkiewicz, Zhenyu Li
Summary: The subsurface structure of the Himalaya is dominated by the seismically active Main Himalayan Thrust fault. The geometry of the Main Himalayan Thrust in central Nepal has a flat-ramp-flat shape, while the geometry in the northern High Himalaya is still uncertain. Through new data from the Gyimng region in China, it has been determined that the ramp has a greater width and reaches a greater depth below the northern High Himalaya than previously thought. The fault is presumed to develop as a gently-dipping ductile shear zone farther north.
Article
Geosciences, Multidisciplinary
Peter Kelemen, Istvan Dunkl, Gabor Csillag, Andrea Mindszenty, Sandor Jozsa, Laszlo Fodor, Hilmar von Eynatten
Summary: Paleogene karst bauxites and their cover sequences in the northeastern Transdanubian Range provide valuable sedimentary records, revealing local and distant aeolian and fluvial sources, as well as episodes of volcanic eruptions. U-Pb geochronology of detrital zircon crystals helps to constrain the age of karstic surface exposure and bauxitic protolith accumulation, improving stratigraphic records and defining denudation stages. The presence of diverse metamorphic units from the Austroalpine basement and Variscan ages from the Bohemian Massif suggest long-distance aeolian sources. These findings contribute to a detailed understanding of the Paleogene evolution and paleogeography of the northeastern Transdanubian Range.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2023)
Article
Geochemistry & Geophysics
Masoud Biralvand, Paolo Ballato, Maria Laura Balestrieri, Mohammad Mohajjel, Edward R. Sobel, Istvan Dunkl, Giordano Montegrossi, Mohammad R. Ghassemi, Johannes Glodny, Manfred R. Strecker
Summary: The understanding of geothermal field is critical for interpreting low-temperature thermochronology (LTT) data in magmatic and metallogenic provinces. This study investigates the complex geological and thermal history of the Takab Range Complex in NW Iran, revealing episodes of exhumation, normal faulting, regional subsidence, and erosional exhumation. The data highlight the impact of magmatic reheating on LTT ages in areas affected by intense magmatism.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Geochemistry & Geophysics
Ioan Seghedi, Reka Lukacs, Ildiko Soos, Marcel Guillong, Olivier Bachmann, Barbara Cserep, Szabolcs Harangi
Summary: The southernmost segment of the Calimani-Gurghiu-Harghita volcanic chain in Romania consists of four aligned volcanoes and represents the youngest manifestation of post-collisional volcanism in the Carpathian-Pannonian Region. Within this section, changes in erupted magma composition and zircon ages indicate modifications in the geodynamic environment. The volcanic activity in the Cucu volcano occurred during a catastrophic slab loss period, while Pilisca and Ciomadul volcanoes developed above a remnant oceanic slab.
Article
Geography, Physical
Felix Borleanu, Laura Petrescu, Ioan Seghedi, Christine Thomas, Luca De Siena
Summary: Imaging the structure of sedimentary basins in collisional settings provides important information for resource extraction and seismic hazard analyses. Seismic attenuation, which is sensitive to stress and fluid interactions, can better constrain small changes in the Earth's matrix than seismic velocity. This study separates different types of attenuation mechanisms and maps them in space to understand the properties of the Carpathian Orogen and surrounding basins.
GLOBAL AND PLANETARY CHANGE
(2023)
Article
Geosciences, Multidisciplinary
Seghedi Ioan, Szakacs Alexandru, Mirea Viorel, Pecskay Zoltan, Luffi Peter
Summary: The Calimani-Gurghiu-Harghita volcanic range is the result of post-collisional magmatism in the Dacia Mega Unit. The volcanic activity in CGH resulted in the construction of composite volcanoes dominated by calc-alkaline lavas and volcanic debris. The study demonstrates that voluminous volcanic debris avalanche deposits vastly dominate the volcaniclastic deposits in CGH.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2023)