Article
Geochemistry & Geophysics
Yunfeng Chen, Yu Jeffrey Gu, Farhanah Mohammed, Jingchuan Wang, Mauricio D. Sacchi, Ruijia Wang, Brooklin Nguyen
Summary: The study improved the understanding of the geological features on the western margin of the North American continent by developing a new Lg-wave attenuation (Q(0)) model, revealing the distribution of high-attenuation and low-attenuation crustal regions, and indicating the possible effects of plate deformation and rock dehydration on crustal attenuation.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geology
S. Tassara, J. J. Ague, V. Valencia
Summary: This study reports the discovery of Acadian hydrous ultramafic cumulate rocks in southern New England, USA, formed through deep-seated fractional crystallization processes, representing one of the few preserved deep subarc hydrous cumulates worldwide. The findings propose a genetic link between these rocks and the evolved coeval plutonism in central-southern New England, supporting the hypothesis that differentiation of mantle-derived hydrous magmas by fractional crystallization and assimilation processes in the deep crust is fundamental in the production of intermediate to silicic magmatism and the geochemical evolution of the continental crust.
Article
Multidisciplinary Sciences
Vincent A. Slabe, James T. Anderson, Brian A. Millsap, Jeffrey L. Cooper, Alan R. Harmata, Marco Restani, Ross H. Crandall, Barbara Bodenstein, Peter H. Bloom, Travis Booms, John Buchweitz, Renee Culver, Kim Dickerson, Robert Domenech, Ernesto Dominguez-Villegas, Daniel Driscoll, Brian W. Smith, Michael J. Lockhart, David McRuer, Tricia A. Miller, Patricia A. Ortiz, Krysta Rogers, Matt Schwarz, Natalie Turley, Brian Woodbridge, Myra E. Finkelstein, Christian A. Triana, Christopher R. DeSorbo, Todd E. Katzner
Summary: Lead poisoning is a significant issue for populations of bald and golden eagles, with unexpectedly high frequencies of chronic and acute poisoning detected. This study finds that lead poisoning suppresses population growth rates for these iconic protected species, highlighting its underappreciated importance.
Article
Geosciences, Multidisciplinary
Lu Wang, Stephen T. Johnston, Nengsong Chen, Heng Wang, Bin Xia, Chuan He, Jianjun Ma
Summary: Regional metamorphism plays a crucial role in understanding lithosphere evolution, especially in orogenic systems. This study on the North Wulan terrane in the Greater Tarim block in NW China provides new insights on the evolutionary history of the region during the assembly of Rodinia. The findings suggest a prolonged subduction-to-collision process in the Greater Tarim block around 1.1-0.9 billion years ago, positioning it between western Laurentia and India-East Antarctica.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2021)
Article
Geography, Physical
Gui-chun Wu, Zhan-sheng Ji, Gary G. Lash, Jian-xin Yao
Summary: Prior to their extinction at the Triassic-Jurassic boundary, conodonts were diverse and abundant during Norian time. The faunal turnovers at the base of the Norian and the Alaunian confirm that the end-Triassic mass extinction was prolonged. Investigation of Norian conodonts is important for understanding the end Triassic mass extinction event and Late Triassic palaeobiogeography. The geographic distribution of Norian conodonts suggests the separation of Eastern Tethys into northern Tethys and southern Tethys realms.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Todd A. LaMaskin, Jonathan A. Rivas, David L. Barbeau, Joshua J. Schwartz, John A. Russell, Alan D. Chapman
Summary: Differing interpretations of geophysical and geologic data have led to debate regarding the continent-scale plate configuration, subduction polarity, and timing of collisional events on the western North American plate margin in pre-mid-Cretaceous time. New detrital zircon U-Pb ages from clastic rocks in the Klamath Mountains of northern California and southern Oregon provide evidence supporting the long-lived, east-dipping subduction and endemic origin models over the collision and exotic origin models. These findings highlight the importance of understanding the tectonic history of the western North American plate margin.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geosciences, Multidisciplinary
Manzshir Bayarbold, Atsushi Okamoto, Otgonbayar Dandar, Masaoki Uno, Noriyoshi Tsuchiya
Summary: In this study, we investigated the petrology and geochemistry of the Khungui eclogites and metamorphosed continental crust in the Central Asian Orogenic Belt (CAOB), Western Mongolia. The geochemical signature of the Khungui eclogite indicates that the collision of the continental and island arcs causes Precambrian continental crust thickening in the CAOB.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
News Item
Multidisciplinary Sciences
Chris Woolston
Summary: In both US and Canadian industry and academia, men are paid higher wages than women for permanent positions.
Article
Biodiversity Conservation
Bradley J. Butterfield, Emily C. Palmquist, Kevin R. Hultine
Summary: This study in the western United States examined the relationship between riparian dependence and climate niches of willows, and found that riparian dependence varies significantly among species. Riparian dependence was positively correlated with mean annual temperature and diurnal temperature range niche, indicating evolutionarily labile co-adaptations. Oak trees, on the other hand, showed weaker niche relationships with riparian dependence.
DIVERSITY AND DISTRIBUTIONS
(2021)
Article
Virology
Brendan B. Larsen, Sophie Gryseels, Hans W. Otto, Michael Worobey
Summary: This study analyzed the diversity of paramyxoviruses in wild small mammals in southern Arizona and explored their host range and specificity in bats and rodents. The results revealed at least two clades of rodent-borne paramyxoviruses in Arizona, while bat-associated paramyxoviruses formed a single clade.
JOURNAL OF VIROLOGY
(2022)
Editorial Material
Environmental Sciences
Joe Ackerman, David B. Levin
Summary: This article identifies the problem of plastic proliferation, the inadequacies of current recycling efforts, and the urgency to address this issue in the light of the microplastic threat. It highlights the differences between recycling practices in North America and certain countries in the European Union, and the obstacles to plastic recycling such as economic, physical, and regulatory challenges.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Meteorology & Atmospheric Sciences
William E. Chapman, Aneesh C. Subramanian, Shang-Ping Xie, Michael D. Sierks, F. Martin Ralph, Youichi Kamae
Summary: Using a high-resolution atmospheric general circulation model simulation, this study investigates the impact of ENSO on monthly anomalies and reveals the evolving relationship between internal variability and ENSO forced signals. Signal-to-noise analysis identifies February and March of ENSO years as the most predictable months, while December shows little to no potential predictability.
JOURNAL OF CLIMATE
(2021)
Article
Geology
Michelangelo Martini, Luca Ferrari, Amabel Ortega Rivera
Summary: During the Cretaceous-Eocene period, North America experienced a series of shortening events that resulted in major orogenic belts. However, the timing of these events is not well constrained everywhere, leading to misinterpretation of tectonic history in some areas, particularly along the North American Pacific margin, and an incomplete understanding of subduction dynamics. This study focuses on southern Mexico and presents structural and isotopic data that reveal two episodes of shortening: one around 118-112 Ma and another around 104-90 Ma. These findings contribute to a better understanding of the shortening history in Mexico and highlight the importance of the Late Aptian-Early Albian stage of deformation.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geology
Qiang Shi, Long Ma, Xiangzhi Chen, Guochun Zhao, Kaiyun Chen, Zhong-Yuan Xu, Xiao-Jie Dong
Summary: In this study, the petrology, geochemistry, and isotope geochronology of Late Neoarchean charnockites in the Daqingshan terrane at the northern margin of the North China Craton were investigated. The sources, petrogenesis, and tectonic implications of the charnockites were determined based on their geochemical characteristics. The study revealed that the charnockites exhibit magnesian and calc-alkaline characteristics, and they were formed during a subduction-related thermo-tectonic event in the Late Neoarchean.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geosciences, Multidisciplinary
Majie Fan, Kurt N. Constenius, Rachel F. Phillips, David L. Dettman
Summary: The study reveals the paleotopographic changes in the North American Cordilleran orogen from Late Cretaceous to Late Oligocene, showcasing the biodiversity decline of molluscan taxa in response to climate cooling. The reconstructed delta O-18 values suggest a 1 km surface uplift followed by a 0.5 km drop in elevation of the orogenic front, indicating the effects of climate change and tectonic processes on the mountain system.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2021)
Article
Geosciences, Multidisciplinary
Luke Bickerton, Maurice Colpron, Dan Gibson, Derek J. Thorkelson, James J. L. Crowley
CANADIAN JOURNAL OF EARTH SCIENCES
(2020)
Article
Geochemistry & Geophysics
Nicholas W. Hayman, Matthew Rioux, Ryo Anma, Kenichiro Tani, Daniel J. Dunkley, Jim Crowley, Mark Schmitz
Article
Geosciences, Multidisciplinary
J. McPhie, K. J. Ehrig, M. B. Kamenetsky, J. L. Crowley, V. S. Kamenetsky
AUSTRALIAN JOURNAL OF EARTH SCIENCES
(2020)
Article
Geosciences, Multidisciplinary
Jonathan Obrist-Farner, Andreas Eckert, Marek Locmelis, James L. Crowley, Byron Mota-Vidaure, Emanuele Lodolo, Joshua Rosenfeld, Edward Duarte
Article
Geosciences, Multidisciplinary
S. Bodorkos, J. L. Crowley, J. C. Claoue-Long, J. R. Anderson, C. W. Magee
Summary: The crystallization age of the Derim Derim Dolerite is confirmed to be around 1320-1327 Ma, indicating a magmatic activity lasting approximately 10-15 million years. The geochemical variations in Mesoproterozoic intraplate mafic rocks across the Northern Territory may reflect a series of magmatic pulses previously obscured by low precision isotopic dates. The similarities between the timing and geochemistry of Derim Derim-Galiwinku mafic igneous activity and the Yanliao Large Igneous Province in North China Craton suggest relatively close proximity between the North Australian Craton and the North China Craton during this period.
AUSTRALIAN JOURNAL OF EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
I Metcalfe, J. L. Crowley
JOURNAL OF ASIAN EARTH SCIENCES
(2020)
Article
Geosciences, Multidisciplinary
Margaret D. Thompson, James L. Crowley
AMERICAN JOURNAL OF SCIENCE
(2020)
Article
Geosciences, Multidisciplinary
J. J. Cooling, J. L. Crowley, J. L. McKellar, J. S. Esterle, R. S. Nicoll, V Bianchi
Summary: This study presents U-Pb zircon ages and palynostratigraphic results from the Orallo Formation in the Surat Basin, Queensland. The results suggest a Berriasian?/Valanginian-Hautevarian age for the Orallo Formation. Additionally, combining these ages with previously published geochronological dates indicates the Jurassic-Cretaceous boundary likely lies within the Gubberamunda Sandstone in the Surat Basin succession.
AUSTRALIAN JOURNAL OF EARTH SCIENCES
(2021)
Article
Geology
Lyle L. Nelson, Emily F. Smith, Eben B. Hodgin, James L. Crowley, Mark D. Schmitz, Francis A. Macdonald
Article
Geology
Christopher R. Fielding, Tracy D. Frank, Allen P. Tevyaw, Katarina Savatic, Vivi Vajda, Stephen McLoughlin, Chris Mays, Robert S. Nicoll, Malcolm Bocking, James L. Crowley
Summary: The Upper Permian to Lower Triassic coastal plain successions of the Sydney Basin in eastern Australia have been investigated to assess palaeoenvironmental changes. Explosive volcanic eruptions during the late Permian and some during the Early Triassic influenced these basins, providing high-resolution age determination. The end-Permian Extinction marked the shift towards better-drained alluvial conditions into the Early Triassic, with no immediate aridification after the extinction event.
Article
Geochemistry & Geophysics
Liam Courtney-Davies, Cristiana L. Ciobanu, Simon R. Tapster, Nigel J. Cook, Kathy Ehrig, James L. Crowley, Max R. Verdugo-Ihl, Benjamin P. Wade, Daniel J. Condon
Article
Geology
Nicholas L. Swanson-Hysell, Steven A. Hoaglund, James L. Crowley, Mark D. Schmitz, Yiming Zhang, James D. Miller
Summary: The Duluth Complex in Minnesota, USA, is one of the largest mafic intrusive complexes on Earth, formed during the time of the Laurentia's interior. Despite the overall protracted duration of magmatic activity, there were intervals of more voluminous magmatism.
Article
Geosciences, Multidisciplinary
Gaelle Labat, F. elix Gervais, Charles Kavanagh-Lepage, Sophie Jannin, James L. Crowley
JOURNAL OF STRUCTURAL GEOLOGY
(2020)
Article
Geosciences, Multidisciplinary
Benjamin J. C. Neil, H. Daniel Gibson, Sally J. Pehrsson, Edith Martel, Eric J. Thiessen, James L. Crowley
Summary: This study investigates the geological characteristics and detrital zircon geochronology of the Nonacho Group, revealing its depositional history, provenance, and tectonic setting. The findings suggest that the upper formations of the Nonacho Group originated from the Taltson and/or Thelon orogens, with a change in provenance possibly coinciding with a period of uplift and unroofing of plutons.
PRECAMBRIAN RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Eben Blake Hodgin, Juan Carlos Gutierrez-Marco, Jorge Colmenar, Francis A. Macdonald, Victor Carlotto, James L. Crowley, Justin R. Newmann
Summary: This study provides detailed insights into the tectonic and evolutionary history of the Eastern Cordillera in Peru, with important evidence related to the accretion of the Arequipa Terrane. It sheds light on the early Paleozoic tectonic history of the region and presents a new tectonic model explaining the late Neoproterozoic to early Cambrian collision events.