Article
Geosciences, Multidisciplinary
Lin Li, Guillaume Dupont-Nivet, Yani Najman, Mustafa Kaya, Niels Meijer, Marc Poujol, Jovid Aminov
Summary: This study confirms a phase of geological deformation and surface uplift in the Pamir during the middle-late Miocene, indicated by changes in detrital zircon U-Pb age spectra, mudstone bulk-rock epsilon(Nd) values, and stable isotopic values of carbonate cements. These changes suggest different sediment sources and shifts in climate environment.
Article
Geochemistry & Geophysics
Charlotte Fredriksson, Victoria Pease
Summary: This study investigates the geological structure of northern Alaska and identifies the uplift process of the Brooks Range during the Early Cretaceous. By analyzing the age, chemistry, and isotopic data of igneous clasts and samples, it is concluded that the igneous clasts mainly originate from the Brooks Range ophiolite. A revised tectonic model is proposed that integrates the formation of Late Triassic island arc with the evolution of the Brooks Range ophiolite.
Article
Paleontology
Vittorio Pieroni
Summary: For the first time, the presence of nautilids from the Besano Formation has been documented. Five specimens were collected from Monte San Giorgio in Switzerland, representing three different taxa. The study reveals the occurrence of Tainoceratidae and Syringonautilidae families in the middle Besano Formation. Additionally, one nautilid specimen representing another yet unnamed taxon was described. The discovery of the new species Enoploceras rieberi marks the first occurrence of the genus in the Middle Triassic. This finding is significant as nautilids from the Middle Triassic Tethyan region are poorly known, and this is the first record of them in anoxic depositional paleoenvironments of an intra-platform basin.
SWISS JOURNAL OF PALAEONTOLOGY
(2022)
Article
Geology
Jing Chen, Bin Li, Jin-Xi Zhou
Summary: This paper presents new data on the geochemistry, isotope ages, and petrogenetic processes of eight granitoids in the Lalingzaohuo area of the East Kunlun Orogen. The results show that these granitoids belong to the I-type granites, with Middle Triassic granitoids having higher ISr values and lower epsilon Nd(t) values compared to Late Triassic granitoids, indicating different sources in the lower crust. The geochemical and isotopic data also suggest a significant mantle contribution in the formation of these granitoids.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geosciences, Multidisciplinary
Patrycja Wojcik-Tabol, Marta Oszczypko-Clowes, Alfred Uchman, Weronika Pratkowiecka, Beata Dziubinska
Summary: This study investigates the geological environment and organic matter characteristics of the Skole Nappe in the Polish Carpathians. The research reveals that the water column in this area during the Oligocene period was likely divided into tidal water in the upper part and fully marine and anoxic water in the lower part. The brown shale contained abundant organic matter, while the green mudstones had lower organic matter content, potentially due to oxidation and consumption by organisms in warmer waters.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geography, Physical
Xianduo Dai, Yuansheng Du, Martin Ziegler, Chaowen Wang, Qianli Ma, Rong Chai, Hua Guo
Summary: The study analyzed the major, trace and rare earth element compositions and clay mineralogy of mudstones from the northern margin of the South China Plate to evaluate weathering intensity and reconstruct climate variability from the Middle Triassic to the Late Jurassic. Findings suggest a dominant humid climate from the latest Triassic to the early Middle Jurassic, while a seasonally arid climate characterized by low chemical weathering indices prevailed in the pre-Late Triassic and post-Middle Jurassic periods. The study indicates that PCO2 variations, the megamonsoon effect, plate motion, and regional topography all played roles in the observed climate changes during the early Mesozoic.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Salim H. Hussain, Ali Al-Juboury, Mohammed A. Al-Haj, John S. Armstrong-Altrin, Safwan F. Al-Lhaebi
Summary: The study of the Baluti Formation in northern Iraq reveals the geological characteristics and depositional environment of the Late Triassic period, with a focus on the composition of limestone and clastic rocks and the climatic conditions. The abundant components and trace element contents indicate different depositional environments, reflecting the hot, arid climate and marine oxidation conditions at that time.
JOURNAL OF AFRICAN EARTH SCIENCES
(2021)
Article
Geology
Luca Jaselli, Vittorio Pieroni
Summary: For the first time, this article provides a detailed description of an echinoderm fauna from the Middle Triassic San Salvatore Formation in the Southern Alps. Crinoids and echinoids were found in three different localities, including Switzerland and Italy. The migration of crinoids during the Upper Anisian period from the Tethyan Realm to the Germanic basin is documented. Additionally, crinoid taxa collected from the Germanic basin during the Lower and Upper Illyrian periods have been identified in this study, indicating southward migration during the late Illyrian in the Tethys realm.
RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA
(2023)
Article
Geochemistry & Geophysics
Wenwei Guo, Jinnan Tong, Qi He, Mark W. Hounslow, Huyue Song, Jacopo Dal Corso, Paul B. Wignall, Jahandar Ramezani, Li Tian, Daoliang Chu
Summary: A detailed magnetostratigraphic study was conducted on the Shichuanhe section in North China, providing a magnetic polarity scale for the Late Permian-early Middle Triassic interval. The study reveals consistent results with previous research, enabling interregional correlations. The established magnetostratigraphic framework and carbon isotope chemostratigraphy offer insights into the timing of terrestrial ecological crisis in North China.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Greg M. Baniak, Thomas F. Moslow, Stavros Michailides, Matthew G. Adams
Summary: The Lower Triassic Montney Formation in western Canada is the third largest unconventional natural gas deposit globally. It exhibits a wide degree of heterogeneity and consists of four stratigraphic sequences matched to global Triassic substages. Understanding these sequences and their spatial distribution is critical for considering variations in static reservoir properties and their relation to dynamic well performance.
Article
Geography, Physical
Yunfei Huang, Jinnan Tong, Li Tian, Haijun Song, Daoliang Chu, Xue Miao, Ting Song
Summary: This study analyzed the shell-size changes in bivalve fossils from South China during the end-Permian mass extinction and Early-Middle Triassic recovery. The results showed a significant reduction in shell size immediately after the extinction event, followed by a quick rebound and growth in the late Griesbachian. The variations in bivalve size were mainly influenced by factors such as competition, predation, and climatic and oxygen changes.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Geosciences, Multidisciplinary
G. Daners, C. R. Amenabar, G. R. Guerstein, G. Veroslavsky
Summary: Palynological analysis of the uppermost Cretaceous and lowermost Palaeogene sediments in the Gaviotin well in Uruguay identified different marine sedimentary characteristics, which will assist in drilling and hydrocarbon exploration in the area.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Johannes S. Pietsch, Andreas Wetzel, Gaudenz Deplazes, Marco Filipponi
Summary: The Middle Muschelkalk evaporites in northern Switzerland were deposited under arid conditions with reduced sea water inflow from the Tethyan realm. Detailed sedimentological logging revealed various lithofacies and lithofacies associations, as well as substantial thickness variation of the evaporites. Dissolution phenomena and regional thickness variation suggest a tectonically active depositional setting in the Middle Triassic. Despite the tectonic activity, most lithofacies have relatively flat bounding surfaces, indicating simultaneous marine transgressions in wide areas.
SWISS JOURNAL OF GEOSCIENCES
(2023)
Article
Biodiversity Conservation
Adam J. Fitch, Merle Haas, Wayne C'Hair, Eugene Ridgley, Ben Ridgley, Devin Oldman, Crystal Reynolds, David M. Lovelace
Summary: New findings in the lower Popo Agie Formation of central Wyoming led to the reevaluation of the only known hyperodapedontine rhynchosaur in western North America. The phylogenetic analysis rejects the previous identification and suggests a close relationship between the USNM 494329 specimen and Oryctorhynchus bairdi. Additional specimens found in the same formation provide further insights into the evolutionary history of the hyperodapedontines. The Popo Agie Formation is considered significant as it represents the first nonmarine Late Triassic unit of Western North America confidently restricted to the Carnian age.
Article
Geology
Annaka M. Clement, Lydia S. Tackett
Summary: The Gabbs Formation in west-central Nevada provides a valuable record of carbonate crisis and mass extinction events during the Late Triassic to early Jurassic period. The study reveals the gradual disappearance of carbonate facies and multiple sedimentary cycles, offering a more precise timeline of environmental upheaval during the latest Triassic period.
SEDIMENTARY GEOLOGY
(2021)