Article
Geochemistry & Geophysics
Derek L. L. Schutt, Robert W. W. Porritt, Clement Esteve, Pascal Audet, Jeremy M. M. Gosselin, Andrew J. J. Schaeffer, Richard C. C. Aster, Jeffrey T. T. Freymueller, Joel F. F. Cubley
Summary: The Mackenzie Mountains in Canada are currently uplifting despite being far from the nearest plate boundary. Tomographic inversion reveals a low-velocity structure in the lithosphere that extends upward and is associated with the ongoing uplift and seismicity. Strain transfer from the Gulf of Alaska boundary plays a driving role in the uplift, causing the crust to translate and buckle against the craton. Azimuthal anisotropy in the lithosphere indicates misalignment between asthenosphere flow and lithospheric strain.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Maureen D. Long, Lara S. Wagner, Scott D. King, Rob L. Evans, Sarah E. Mazza, Joseph S. Byrnes, Elizabeth A. Johnson, Eric Kirby, Maximiliano J. Bezada, Esteban Gazel, Scott R. Miller, John C. Aragon, Shangxin Liu
Summary: The article discusses the lithospheric evolution of the eastern margin of North America and the unusual properties of the Central Appalachian Mountains, providing evidence for lithospheric loss beneath the region and proposing possible mechanisms. Through various geophysical and geological methods, the study concludes that the lithosphere in this area is thin and has undergone past episodes of lithospheric loss involving mantle upwelling and partial melting.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Calvin G. Barnes, Nolwenn Coint, Melanie A. Barnes, Kevin R. Chamberlain, John M. Cottle, O. Tapani Ramo, Ariel Strickland, John W. Valley
Summary: This study examines the chemical and isotopic characteristics of arc magmas in the Klamath Mountains, northern California, and finds that different parts of the magmatic system display diverse isotopic signatures, reflecting the crystallization of heterogeneous magmas under varied temperatures and conditions.
JOURNAL OF PETROLOGY
(2021)
Article
Geography, Physical
Adam C. Hawkins, Brian Menounos, Brent M. Goehring, Gerald D. Osborn, John J. Clague, Britta Jensen
Summary: This study investigates the times of glacier advance at Gilbert Glacier in British Columbia using radiocarbon dating and surface exposure ages. The analysis of data narrowed the age range of late Holocene advances, highlighting the importance of the tandem approach in better understanding glacier response to climate change in high mountains worldwide.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Green & Sustainable Science & Technology
Gael Anastas, Joao Alfredo Santos, C. J. E. M. Fortes, Liliana V. Pinheiro
Summary: This study assesses the exploitable wave energy resource at five potential sites near the Portuguese coast using a wave model and climate datasets, and finds that the Azores archipelago is the best location for installing wave energy converters.
Article
Green & Sustainable Science & Technology
Christos Petsas, Marinos Stylianou, Antonis Zorpas, Agapios Agapiou
Summary: Air quality in modern cities is crucial for human quality of life and is monitored by international organizations focusing on particulate matter with aerodynamic diameters less than 10, 2.5, and 1 µm. Various physical and anthropogenic processes in cities contribute to the increase of fine and coarse particles, impacting human health and the environment. Monitoring events in Limassol revealed violations were mainly attributed to anthropogenic activities, underscoring the need for further research and continuous air quality monitoring.
Article
Geosciences, Multidisciplinary
Xingfu Huang, Rui Gao, Wenhui Li, Xiaosong Xiong
Summary: This study reveals decoupled crustal deformation on the northeastern margin of the Qilian Mountains, with local duplexing in the lower crust preceding imbricate thrusts in the upper crust. Additionally, it suggests that the Asian lithospheric mantle is underthrust beneath the western Qilian Mountains. Integrating these results provides a better understanding of Cenozoic lithospheric deformation in the region.
SCIENCE CHINA-EARTH SCIENCES
(2021)
Article
Mechanics
Ai-jun Li, Yong Liu
Summary: This study focuses on the hydrodynamic performance and energy absorption of multiple spherical absorbers in front of a straight coast. It develops an analytical solution based on linear potential flow theory for the problem of wave diffraction and radiation by multiple absorbers. The effects of coastal reflection and hydrodynamic interaction on the energy extraction performance of the wave energy converter (WEC) system are analyzed. The results suggest that the energy extraction performance of an isolated absorber is significantly improved when the motions of the waves and absorber are in resonance, and the coastal reflection can enhance the overall energy extraction performance for a WEC system with multiple absorbers.
Article
Geosciences, Multidisciplinary
Karel Silhan
Summary: The study compiled a chronology of snow avalanches and debris flows on the southern coast of the Crimean Mountains, distinguishing between these two natural hazard processes using methods like dendrogeomorphic analysis. The research proved highly effective in confirming over 85% of known events and discussing possible triggers for these events.
Article
Geology
Elizabeth M. Bollen, Harold H. Stowell, Margaret E. Rusmore, Glenn J. Woodsworth, M. Robinson Cecil
Summary: Metamorphism in the Mount Waddington area reached high temperatures and pressures, with garnet growth mainly influenced by high-flux magmatism, but the timing of metamorphism and magmatic events differed significantly.
JOURNAL OF METAMORPHIC GEOLOGY
(2022)
Article
Environmental Sciences
Lalita Zakharikhina, Yury Litvinenko, Alexey Ryndin, Ruslan Saburov, Sergey Shevelev, Georgy Vareljyan
Summary: The Mzymta and Sochi watersheds in Russia have complex geological features and contain various minerals. Through chemical analysis of natural groundwater springs, this study identified five chemical types of water and determined that high sodium concentration and mineralization in groundwater near thermal hydrogen sulfide aquifers are caused by seawater infiltration. The presence of rare-earth elements in the groundwater is related to regional geochemical specialization of the rocks.
Article
Geosciences, Multidisciplinary
M. Robinson Cecil, George E. Gehrels, Margaret E. Rusmore, Glenn J. Woodsworth, Harold H. Stowell, Intan N. Yokelson, Emily Homan, Kouki Kitajima, John W. Valley
Summary: The study uses zircon Hf and O isotopes to track changes in melt sources of the southern Coast Mountains batholith, revealing that magmatism is mainly driven by mantle melting and not periodic input of crustal materials. The flare-ups of magmatism are associated with thickening of the crust and shifting of the arc landward.
Article
Geography, Physical
Georges A. Pearson, Juan Guillermo Martin, Sergio Andres Castro, Maximo Jimenez Acosta, Richard G. Cooke
Summary: The study on the Preceramic shell-bearing midden in the Pearl Island archipelago revealed the occupation activities on Pedro Gonz?alez Island between ca. 6200 and 5600 cal yr BP, showing the exploitation of both marine and terrestrial resources and the dietary importance of snakes in the local ecosystem.
QUATERNARY INTERNATIONAL
(2021)
Article
Ecology
Amr El-Maradny, Mohammed Orif, Amir AlKobati, Mohammed Ghandourah, Radwan Al-Farawati
Summary: The Jeddah coast is experiencing a significant influx of persistent organic pollutants, particularly polycyclic aromatic hydrocarbons (PAHs), which mainly originate from sewage influents, vehicle exhausts, and industrial and harbor activities. A recent study investigated the presence of dissolved PAHs in the surface and near bottom waters of three highly polluted coastal areas in Jeddah city, aiming to determine their distribution patterns and the factors influencing them. The study found that the concentration of PAHs was higher in the near bottom waters compared to the surface waters, with the bottom waters receiving considerable amounts of PAHs from sediments. The PAHs in the area were found to have both petrogenic and pyrogenic origins, and their levels indicated potential adverse effects.
REGIONAL STUDIES IN MARINE SCIENCE
(2023)
Article
Zoology
Stephen J. Richards, Paul M. Oliver
Summary: The Islands of East Melanesia, particularly New Britain, are rich in unique and endemic frog species. A new endemic pelodryadid treefrog has been discovered in New Britain, adding to its already diverse frog fauna. This finding highlights the significance of New Britain as a hotspot for frog diversity in East Melanesia.
VERTEBRATE ZOOLOGY
(2022)
Article
Geochemistry & Geophysics
H. Shafaii Moghadam, Q. L. Li, X. H. Li, R. J. Stern, G. Levresse, J. F. Santos, M. Lopez Martinez, M. N. Ducea, G. Ghorbani, A. Hassannezhad
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Geochemistry & Geophysics
L. Y. Zhang, W. M. Fan, L. Ding, M. N. Ducea, A. Pullen, J. X. Li, Y. L. Sun, Y. H. Yue, F. L. Cai, C. Wang, T. P. Peng, Kyaing Sein
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2020)
Article
Geosciences, Multidisciplinary
Fangyang Hu, Fuyuan Wu, James B. Chapman, Mihai N. Ducea, Weiqiang Ji, Shuwen Liu
GEOPHYSICAL RESEARCH LETTERS
(2020)
Review
Geosciences, Multidisciplinary
Mihai N. Ducea, Alan D. Chapman, Emilie Bowman, Antoine Triantafyllou
Summary: Arclogites are cumulates and residues formed in deep crustal zones beneath continental arcs, representing complementary rocks to andesitic-dacitic liquids of most arcs. These rocks are known for their low silica content, enrichment in heavy rare earth elements, and high density minerals. They form at depths of 35-70 km, record high temperatures at formation, and can be dated using isotopic geochronology techniques. Recent discovery of zircon accessory minerals allows for more precise dating and preservation of crystallization ages in arclogites.
EARTH-SCIENCE REVIEWS
(2021)
Article
Geology
Yunchuan Zeng, Mihai N. Ducea, Jifeng Xu, Jianlin Chen, Yan-Hui Dong
Summary: This study used clinopyroxene compositions and zircon Hf-O isotopes to investigate the formation mechanism of Eocene adakitic rocks from the Qiangtang block in central Tibetan Plateau. Results suggest that the origin of these rocks is likely from foundered and eclogitized lower crust rather than subducted upper crust. The mantle-like zircon isotopes support a mafic source hypothesis. Surface uplift in central Tibet may not be significant due to weak crust as a response to lithosphere removal.
Article
Geochemistry & Geophysics
Gilby Jepson, Barbara Carrapa, Sarah W. M. George, Antoine Triantafyllou, Shana M. Egan, Kurt N. Constenius, George E. Gehrels, Mihai N. Ducea
Summary: The study explores the use of various dating methods and geochemical analyses in different tectonic domains to understand the cooling history and structural information of rocks in the Cordilleran orogenic systems. The comparisons of geochemical data provide insights into the formation and alteration history of apatite, as well as the cooling processes and structural evolution of the rocks. The findings demonstrate the potential of combined dating and geochemical approaches for new applications in thermochronology.
Article
Geosciences, Multidisciplinary
Mihai N. Ducea, Alan D. Chapman, Emilie Bowman, Constantin Balica
Summary: Arclogites are rock formations resembling eclogites, formed at the roots of thick arcs as ultramafic residues. They play an important complementing role in subduction zones by representing the volatile mineral residues left behind after magma extraction.
EARTH-SCIENCE REVIEWS
(2021)
Article
Anthropology
J. A. Stephens, M. N. Ducea, D. J. Killick, J. Ruiz
Summary: Recent analytical developments in mass spectrometry have enabled accurate measurements of "non-traditional" isotopic ratios of elements, with research aiming to infer the geological provenance of archaeological materials. However, limited ranges of isotopic ratios and extensive overlap between geological sources currently hinder the usefulness of these isotopic systems for provenance inference.
JOURNAL OF ARCHAEOLOGICAL SCIENCE
(2021)
Article
Evolutionary Biology
Juan Carlos Fernicola, Ana N. Zimicz, Laura Chornogubsky, Mihai Ducea, Laura E. Cruz, Mariano Bond, Michelle Arnal, Magali Cardenas, Mercedes Fernandez
Summary: Recent research has identified the basal beds of the lower section of the Lumbrera Formation as early Eocene deposits dating between 55-46.2 Ma, based on a succession of hyperthermal events. The study also presents one of the oldest cingulate assemblages in America from the early Eocene hyperthermal period, indicating an early diversification of the Cingulata during the Paleocene.
JOURNAL OF MAMMALIAN EVOLUTION
(2021)
Article
Geochemistry & Geophysics
Mihai Vlasceanu, Mihai N. Ducea, Peter Luffi, Anca Barla, Ioan Seghedi
Summary: This study presents a database containing previously published geochronologic, geochemical, and isotopic data on Mesozoic to Quaternary igneous rocks from the Carpathian-Pannonian region. The database includes data from five magmatic arcs and is publicly available online. The database can be utilized to calculate paleo crustal thicknesses in the Carpathians using geochemical methods.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Review
Geochemistry & Geophysics
James B. Chapman, Jessie E. Shields, Mihai N. Ducea, Scott R. Paterson, Snir Attia, Katie E. Ardill
Summary: Continental arcs in Cordilleran orogenic systems exhibit episodic changes in magma production rate over tens of millions of years, with rates reaching up to several 100s km(3) km(-1) Myr(-1). The recycling of crust-derived magmas back into the mantle may contribute to these fluctuations. Additionally, arc migration could result in irregular variations in magmatic activity.
Article
Geosciences, Multidisciplinary
Fangyang Hu, Fu-Yuan Wu, Mihai N. Ducea, James B. Chapman, Lei Yang
Summary: This study examines the mechanisms of crustal deformation and uplift in orogenic plateaus, particularly in eastern Tibet. The findings provide evidence for the existence of crustal flow and uplift in this region and refute the hypothesis of long-distance crustal flow. The analysis of geochemical and isotopic data from Cenozoic igneous rocks suggests that magma originates from the partial melting of the local crust, supporting the idea of localized crustal flow. The episodic magmatism during the Cenozoic is correlated with crustal uplift, which is attributed to the continued indentation of the Indian Block and upwelling of the asthenosphere.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Review
Geochemistry & Geophysics
P. Luffi, M. N. Ducea
Summary: Understanding how continental crust formed and evolved is one of the major goals of geology. Chemical composition of igneous rocks formed at modern convergent plate margins correlates with crustal thickness and elevation at the time of magmatism. Therefore, when averaged over local and regional scales, a series of chemical parameters act as excellent tracers of crustal thickness. These parameters in turn are used on ancient igneous rocks in order to determine crustal thickness and elevation of mountain ranges during magmatism; they are referred to as chemical mohometers and paleo-altimeters. Here, we review several proposed parameters and recommend new ones. We provide a MATLAB (R) app that ingests a variety of geochemical parameters and calculate paleocrustal thickness and elevation of diverse possible geologic applications.
REVIEWS OF GEOPHYSICS
(2022)
Article
Geography, Physical
Michael Styllas, Christos Pennos, Aurel Persoiu, Athanasios Godelitsas, Lambrini Papadopoulou, Elina Aidona, Nikolaos Kantiranis, Mihai N. N. Ducea, Matthieu Ghilardi, Francois Demory
Summary: This study investigates the balance between erosion and aeolian dust accretion in the formation of an alpine soil profile in the periglacial zone of Mount Olympus in Greece. The findings reveal that aeolian dust contributes between 50% and 65% to the development of the soil profile. Cryoturbation, weak pedogenesis, and clay mineral alteration also occur within the Mediterranean periglacial zone of Mount Olympus.
EARTH SURFACE PROCESSES AND LANDFORMS
(2023)
Article
Mineralogy
Marcus J. Origlieri, Robert T. Downs, Derek R. Hoffman, Mihai N. Ducea, Jeffrey E. Post
Summary: Marshallsussmanite is a new pyroxenoid mineral with a vitreous pink bladed crystal structure, complex chemical composition, and unique crystallographic features.
MINERALOGICAL MAGAZINE
(2021)