Article
Geosciences, Multidisciplinary
Zipei Guo, Haibo Zou
Summary: This study analyzed the trace element chemistry and Hf-O isotope compositions of young zircons from three volcanoes in the Tengchong volcanic field, China. The results provide insights into magma evolution processes and conditions for high-K calc-alkaline volcanic rocks. The findings suggest that fractional crystallization of plagioclase and zircon occurred during magma cooling, and the involvement of high eHf and low 818O juvenile crustal materials during shallow magma evolution.
GEOSCIENCE FRONTIERS
(2023)
Article
Geosciences, Multidisciplinary
Zipei Guo, Haibo Zou
Summary: Young zircons from 3 Holocene volcanoes in the Tengchong volcanic field, SE Tibet, were studied to investigate magma evolution processes and conditions for high-K calc-alkaline volcanic rocks in a post-collisional setting. The study found that zircon Hf content and Yb/Sm ratio increase while zircon Eu anomaly and Th/U ratio decrease during magma cooling, indicating fractional crystallization. Moreover, the increasing zircon Hf isotope ratio (eHf values) with decreasing zircon Ti content and falling temperature suggests the incorporation of high eHf juvenile materials in the crystallizing zircons. Negative correlations between zircon eHf and zircon 818O support open-system magma evolution. The average Eu anomalies in zircons indicate a crustal thickness of 40.7 ± 6.8 km, consistent with geophysical measurements.
GEOSCIENCE FRONTIERS
(2023)
Article
Geosciences, Multidisciplinary
Xiaohui Liu, Rui Gao, Xiaoyu Guo, Lin Ding
Summary: This study investigates the uplift history of the central Tibetan plateau through the analysis of zircon grains in the Lunpola basin sediments. The results reveal that the central Tibetan plateau experienced crustal thickening and surface elevation increase from the Paleogene to the Oligocene, which may be associated with convective removal of a thickened Tibetan lithosphere.
Article
Geosciences, Multidisciplinary
Yun-Chuan Zeng, Ji-Feng Xu, Jian-Lin Chen, Bao-Di Wang, Feng Huang
Summary: This study investigates the paleo-crustal thickness and elevation of western Tibet from the Cretaceous to Eocene using geochemical methods. The findings show that the northern Lhasa Block and southern Qiangtang Block had similar paleo-crustal thickness during the Late Cretaceous. However, by the mid-Eocene, the Qiangtang Block had reached its present-day thickness and elevation, which was not caused by the underthrusting of Indian crust. The study suggests that the western and central Qiangtang Block had a similar tectonomagmatic evolution during the early Paleogene, resulting in the formation of a continuous proto-plateau in central Tibet. Furthermore, the underthrusting of the Indian lithosphere beneath the western Qiangtang Block after Eocene had minimal impact on further crustal thickening and uplift.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Qiong-Xia Xia, Yi-Xiang Chen, Ren-Xu Chen, Yong-Fei Zheng
Summary: The elevated Hf isotope compositions of peritectic zircons in anatectic granites do not accurately reflect the Hf isotope composition of parental rocks, due to the decomposed minerals with high Lu/Hf ratios during crustal anatexis. Care must be taken when using Hf isotope ratios to trace the nature of parental rocks with respect to magmatic processes and crustal evolution.
Article
Multidisciplinary Sciences
Nadja Drabon, Benjamin L. Byerly, Gary R. Byerly, Joseph L. Wooden, C. Brenhin Keller, Donald R. Lowe
Summary: This study examines the geochemical characteristics of Hadean detrital zircons from South Africa, finding that the majority of these zircons show a mantle affinity similar to zircon from modern plume-type mantle environments, rather than zircon from modern continental or oceanic arcs.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Geosciences, Multidisciplinary
Pei-yuan Hu, Qing-guo Zhai, Peter A. Cawood, Roberto F. Weinberg, Guo-chun Zhao, Yue Tang, Yi-ming Liu
Summary: Paleogeographic reconstruction of Precambrian terranes reworked by Phanerozoic orogens, such as the Tibetan Plateau, reveals complex lithotectonic relations due to intracrustal reworking. Global and regional detrital zircon rare earth element (REE) databases show trends in LREE/HREE and Eu/Eu* that record the crustal evolution of the source and provide a new approach for paleogeographic reconstructions. By analyzing sedimentary and igneous rocks in the Lhasa terrane and detrital zircon samples from the northern margin of Gondwana, it is demonstrated that the Lhasa terrane had an African affinity in the Rodinia-Gondwana supercontinent cycles (ca. 1.4-0.4 Ga).
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Anirban Mitra, Sukanta Dey, Pranab Das, Keqing Zong, Yongsheng Liu
Summary: Through the study of whole-rock geochemistry, detrital zircon U-Pb-Hf isotopes, and trace element data from Mesoarchean clastic rocks in two greenstone belts of the western Dharwar Craton, it is found that these rocks were derived from a strongly weathered stable continental provenance dominated by low-HREE TTGs and K-rich granites of shallow crustal origin. The detrital zircon U-Pb and Lu-Hf data indicate two major crust formation events, with the antiquity of the western Dharwar Craton traced back to at least 3.8 Ga. The detrital record suggests episodic crustal growth and reworking in the western Dharwar Craton during the Paleoarchean to early Mesoarchean period, possibly related to intraplate processes.
Article
Environmental Sciences
Yanni Jiao, Luping Yang, Zhengqiao Kong, Lijun Shao, Guoling Wang, Xiaofei Ren, Yongjun Liu
Summary: This study provided primary data on trace elements and rare earth elements in mantis shrimp samples from Shandong Province, China, showing that while most target TREs were within recommended limits, Cd and iAs levels exceeded these limits. The study also found that the concentrations of TREs in mantis shrimp were impacted by the characteristics of the species.
MARINE POLLUTION BULLETIN
(2021)
Article
Geochemistry & Geophysics
Jun Wang, Qiang Wang, Peng Sun, Wei Dan, Andrew C. Kerr, Zhi-Ping Zhang, Le Zhang, Gangjian Wei, Han Dong, Wan-Long Hu, Zong-Yong Yang, Xiu-Zheng Zhang, Yue Qi
Summary: Through the study of the southern Tibetan Tethyan arc belt, it is found that both the high-δO-18 zircons and coeval lavas are derived from a high-δO-18 arc mantle source containing a large amount of sediments. The formation of zircons did not involve crustal reworking or melting. Therefore, the high-δO-18 zircons are products that record crustal growth during crystallization.
JOURNAL OF PETROLOGY
(2023)
Article
Geochemistry & Geophysics
Shao-Wei Zhao, Chao Yang, Shao-Cong Lai, Xian-Zhi Pei, Zuo-Chen Li, Ren-Zhi Zhu
Summary: Research on the Middle Triassic appinites in the Tengchong Block revealed that these rocks were formed in a subduction environment with N-MORB affinity and were possibly influenced by about 2% subducted sediment-derived fluid, resulting in enriched Sr-Nd isotopic compositions. The evolution process of the rocks was due to partial melting of this metasomatized mantle source.
Article
Geochemistry & Geophysics
L. B. Streicher, W. van Westrenen, J. M. Hanchar, F. M. Brouwer
Summary: Several methods have been proposed to trace geological processes using rare earth element (REE) concentrations in zircon. Precise determination of REE partition coefficients (D) in zircon is challenging, especially for light rare earth elements. However, modeling with a prediction function based on the crystal lattice strain model can overcome this difficulty.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Environmental Sciences
Annemie Kusturica, Neele van Laaten, Henrik Drake, Thorsten Schafer
Summary: The study reveals that secondary calcite formed in deep granitic fractures co-precipitates with radionuclide analogues. The distribution coefficients of light rare-earth elements are relatively high, while those of strontium and uranium are remarkably low.
ENVIRONMENTAL EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Xiao-Ping Xia, Juntong Meng, Lin Ma, Christopher J. Spencer, Zexian Cui, Wan-Feng Zhang, Qing Yang, Le Zhang
Summary: By analyzing zircon water content, oxygen isotopes, and trace element contents of a granitic suite from the Gangdese batholith in Tibet, it was found that H2O-in-zircon is a good indicator for tracing magma fluid evolution. The study demonstrated the significance of water in influencing magma properties and the potential of using zircon water content for studying magma evolution.
Article
Geochemistry & Geophysics
J. W. D. Strong, P. A. Cawood, A. R. Cruden, O. Nebel, J. Mulder, A. P. Dickin
Summary: The Winnipeg River terrane, one of the oldest plutonic-gneiss terranes in the Archean Superior Province, plays a crucial role in understanding the evolution of Earth's largest Archean craton. The study evaluates the evolution of this terrane using various isotope data, revealing important information about rock crystallization and crustal recycling.
Article
Geochemistry & Geophysics
Kurt E. Sundell, Joel E. Saylor
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2017)
Article
Geochemistry & Geophysics
Kurt E. Sundell, Joel E. Saylor, Thomas J. Lapen, Richard H. Styron, Dustin P. Villarreal, Paola Usnayo, Jose Cardenas
Article
Geochemistry & Geophysics
Kurt E. Sundell, George E. Gehrels, Mark E. Pecha
Summary: The study presents a method to acquire zircon U-Pb dates at significantly higher rates using multi-collector LA-ICP-MS. Results showed that the new method yielded robust age distributions suitable for quantitative analysis and maximum depositional age calculations. The study holds promise for DZ geochronology with minor sacrifices in accuracy and measurement uncertainty.
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
(2021)
Article
Geochemistry & Geophysics
Joel E. Saylor, Kurt W. Rudolph, Kurt E. Sundell, Jolante van Wijk
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Geosciences, Multidisciplinary
Caden J. Howlett, Andrew K. Laskowski
Summary: Despite the widespread and economic importance of gold placer deposits, current provenance studies of placer sediments are often qualitative. This study utilized detrital zircon geochronology to determine the origin of zircon in placer deposits, providing insights into the potential sources of gold and demonstrating the applicability of this technique to placer deposits. Analyzing samples from the Pioneer District in western Montana, the study revealed a diverse range of U-Pb ages and proposed that zircons over 250 million years old were recycled from various geological units, supporting previous interpretations of gold deposition in the region.
Article
Geochemistry & Geophysics
K. E. Sundell, J. E. Saylor
Summary: New two-dimensional quantitative comparison methods were developed for detrital geochronology, extending commonly used one-dimensional methods. Results demonstrate reliable reflection of detrital record on igneous record over wider time intervals, with the two-dimensional comparison capable of identifying specific continental landmasses over narrower time intervals.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geosciences, Multidisciplinary
Joel E. Saylor, Kurt E. Sundell
Summary: This study successfully applied non-negative matrix factorization to recover two-dimensional distributions and mixing weights of sediment sources, confirming its effectiveness in interpreting sediment provenance records.
JOURNAL OF THE GEOLOGICAL SOCIETY
(2021)
Article
Geochemistry & Geophysics
Caden J. Howlett, Aislin N. Reynolds, Andrew K. Laskowski
Summary: Metamorphic core complexes are products of crustal extension, with their dynamics still being debated. Research suggests that the temporal relation between magmatism and extension may play a key role in the evolution of MCCs.
Article
Geosciences, Multidisciplinary
Kurt E. Sundell, Sarah W. M. George, Barbara Carrapa, George E. Gehrels, Mihai N. Ducea, Joel E. Saylor, Martin Pepper
Summary: Research on the northern Central Andean Plateau suggests a long-term crustal thickening since the Late Cretaceous, with significant increases in crustal thickness occurring at 80-55 million years ago and from 35 million years ago to present, coinciding with high-flux magmatism. During an intermediate period, decreased magmatic activity due to shallow subduction obscured the magmatic record, but crustal thickening continued via crustal shortening.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
K. E. Sundell, F. A. Macdonald
Summary: The assembly and dispersion of continental crust play a crucial role in paleogeography and geochemical cycles. Zircon initial hafnium (epsilon Hf-T) can be used to track the reworking of Earth's crust. The study reveals significant geographic and temporal bias in the global epsilon Hf-T record, which is associated with sampling and regional tectonic events.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Feng Cheng, Andrew V. Zuza, Yiduo Liu, Kurt Sundell
Summary: This article introduces the structural features, research methods, and case studies of fold-and-thrust belts, emphasizing the importance of integrating multiple datasets and conducting comparative studies to promote a deeper understanding of fold-and-thrust belts and contractional orogens.
JOURNAL OF THE GEOLOGICAL SOCIETY
(2023)
Article
Geology
Paul K. Link, Chris W. Welcker, Kurt E. Sundell
Summary: Detrital zircons in the Snake River drainage in Idaho effectively represent the geochronology of Idaho magmatic rocks from both Laurentia and the accreted terranes west of the Salmon River. Large-scale analysis and modeling of the detrital zircon ages reveal that the upper Snake River contributes 30% while the rest comes from the southern Idaho batholith. The study suggests that the trapping of sediment above the dams has reduced the detrital zircon supply in the Hells Canyon from the Snake River. Peak flow volume and zircon fertility of source rocks are major factors influencing the detrital zircon percentages in individual drainages.
SEDIMENTARY GEOLOGY
(2023)
