Article
Geosciences, Multidisciplinary
Neil J. Tabor, John Geissman, Paul R. Renne, Roland Mundil, William S. Mitchell, Timothy S. Myers, Jacob Jackson, Cindy V. Looy, Renske P. Kirchholtes
Summary: The Whitehorse Group and Quartermaster Formation in the Palo Duro Basin represent the final deposition episode of red-bed terrestrial sequences in north-central Texas. The formations comprise mainly red quartz siltstone to fine sandstone, gypsum, claystones, and dolomite. The lower Quartermaster Formation exhibits meandering channels and overbank mudstones, while the Upper Whitehorse Group lacks paleosols. Age information from volcanic ash-fall deposits suggests the presence of the Permian-Triassic boundary in the lower Quartermaster Formation/upper Whitehorse Group. Carbon and oxygen isotope data indicate changes in paleoclimate and biotic recovery across the Permian-Triassic boundary.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geology
Libby R. W. Ives, John L. Isbell
Summary: This study reexamines the Late Paleozoic glaciation conditions in the Tasmanian Basin through facies analysis and sequence stratigraphy, providing a detailed understanding of the glaciogenic sedimentary systems. The findings enhance our knowledge of the global climate system during the Late Paleozoic Ice Age.
SEDIMENTARY GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Desiree P. Hullaster, Gerilyn S. Soreghan, Ravi K. Kukkadapu, Brock S. Dumont, Kato T. Dee, Andrew S. Elwood Madden
Summary: The siliciclastic strata of the Colorado Plateau have distinctive colors that record early depositional and later diagenetic events. The study investigates the geological significance of the colors and reveals that grain size and water-rock interactions play a crucial role in producing the color variations.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Marie Olivier, Sylvie Bourquin, Guy Desaubliaux, Celine Ducassou, Camille Rossignol, Gautier Daniau, Dan Chaney
Summary: This study investigates the evolution of depositional environments in the Late Pennsylvanian-early Permian of the Paradox Basin in Utah, USA, through detailed sedimentological and high-resolution sequence stratigraphic analyses. The study aims to define a model of landscape evolution, discuss the stratigraphic model, and evaluate the significance of cyclicity in the paleoclimatic context. The findings reveal complex interactions between aeolian, fluvial, and marine environments in the Permian succession of the Paradox Basin, and highlight the importance of high-resolution stratigraphic analyses in understanding cyclicity in the Late Paleozoic Ice Age paleoclimatic context.
Article
Geography, Physical
Xinchun Liu, Mingcai Hou, Xiaolin Chang, Song Wang, James G. Ogg, Hongwei Luo, Hongrui Zhang, Caineng Mu, Yu Liu
Summary: The marine red beds of the late Ordovician exhibit diverse characteristics and are influenced by regional tectonic settings and environmental changes. These different red-colored sediment layers provide crucial information about Earth's history and environmental evolution.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Geography, Physical
Randy Calcote, Christopher Nevala-Plagemann, Elizabeth A. Lynch, Sara C. Hotchkiss
Summary: This study reconstructed the climate in the Northwest Wisconsin Sand Plain (NWSP) to identify potential climatic drivers of changes in vegetation and fire regimes. It was found that oak pollen was replaced by pollen from xeric pine taxa around 1425 cal. yr BP, accompanied by larger, less frequent charcoal peaks, and that white pine pollen increased while charcoal influx decreased around 700 cal. yr BP, indicating wetter conditions. The research also used a lake-level record to show that long-term changes in moisture availability were associated with these ecosystem changes.
Article
Geology
Elizabeth Allen Johnson, M. Elliot Smith, Gary L. Gianniny, Paul J. Umhoefer
Summary: This study uses Structure from Motion photogrammetry to quantify stratigraphic variation in three dimensions in a deep canyon in southern Utah, integrating the data with geochronology and biostratigraphy to assess depositional cyclicity. The research reveals insights into the sea-level changes and depositional mechanisms responsible for cyclicity in the Paradox Formation.
JOURNAL OF SEDIMENTARY RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Mathilde Mercuzot, Camille Rossignol, Sylvie Bourquin, Jahandar Ramezani, Celine Ducassou, Marc Poujol, Laurent Beccaletto, Pierre Pellenard
Summary: This study reports new geochronology from the Aumance and Decize-La Machine basins in northern French Massif Central, indicating synchronous development of the basins during the carboniferous-Permian transition period with high sedimentation rates.
JOURNAL OF THE GEOLOGICAL SOCIETY
(2023)
Article
Geography, Physical
Steven L. Forman, Zequn Wu, Logan Wiest, Liliana Marin, Connor Mayhack
Summary: The research focuses on the Western Red River and reveals the formation of three terrace levels and their partial burial by aeolian sediments. The analysis of sedimentary facies and dating of quartz grains shows two periods of fluvial aggradation at ca. 80 ka and 30 to 13 ka. The latest aggradation event, which formed the lowest terrace, coincides with a wet period during the Little Ice Age.
QUATERNARY RESEARCH
(2023)
Article
Multidisciplinary Sciences
F. A. Mouraviev, N. M. Khasanova, E. Z. Yunusova
Summary: The dolomitic calcrete profiles from the Boyevaya Gora and Tuyembetka sections in Orenburg Cis-Urals were studied using sedimentological, mineralogical, and geochemical methods. The presence of anhydrite and low Mn2+ partitioning ratio suggest primary origin and rapid crystallization from soil waters, while EPR analysis identified free organic radicals and phosphorus-associated anion centers in the pedogenic dolomite, indicating a biogenic contribution to its formation. Fossilized fungal hyphae and bacteriomorphs were detected in both calcretes, leading to discussion on the bacterial origin of dolomite in the studied calcretes.
UCHENYE ZAPISKI KAZANSKOGO UNIVERSITETA-SERIYA ESTESTVENNYE NAUKI
(2021)
Article
Geochemistry & Geophysics
A. V. Chistyakova, R. V. Veselovskiy, V. B. Khubanov, A. V. Ivanov, A. E. Marfin, N. V. Bryanskiy, V. K. Golubev
Summary: This study presents the first systematic U-Pb LA-ICP-MS dating of detrital zircons from 12 samples of Permian-Triassic rocks in the eastern part of the Moscow basin. The results reveal that the sedimentation of Upper Permian and Lower Triassic terrigenous complexes was influenced by two competing sources with different ages. Raman spectroscopy analysis also identifies an older terrigenous basin as a separate source of zircons, which experienced thermal impact in the Vendian-Cambrian time.
GEODYNAMICS & TECTONOPHYSICS
(2023)