Article
Geology
Jared T. Voris, Darla K. Zelenitsky, Francois Therrien
Summary: Recent research has enhanced our understanding of the diversity and paleobiogeography of caenagnathids in North America. However, the late Maastrichtian caenagnathid record remains incomplete. This study describes three isolated elements of caenagnathids found in Alberta, Canada, providing evidence for the widespread occurrence of caenagnathids in North America during the last one million years of the Cretaceous.
CRETACEOUS RESEARCH
(2024)
Article
Geology
Kawan Carvalho Martins, Marcos Vinicius Lopes Queiroz, Juan Vitor Ruiz, Max Cardoso Langer, Felipe Chinaglia Montefeltro
Summary: A new baurusuchid, Aphaurosuchus kaiju, has been discovered in Southeast Brazil. Phylogenetic analysis revealed the two main lineages of Baurusuchidae and identified Ogresuchus furatus from Europe and Razanandrongobe sakalavae from Madagascar as non-baurusuchid baurusuchians.
CRETACEOUS RESEARCH
(2024)
Article
Geology
Lucie Kunstmullerova, Martin Kostak
Summary: This study provides a paleoecological, systematical, and statistical evaluation of bivalve assemblages from the Pecinov Member in the Bohemian Cretaceous Basin, revealing the impact of the Ocean Anoxic Event (OAE2) at the Cenomanian-Turonian boundary on benthic organisms. The results show that prior to the positive shift of the 313Corg, the bivalve association is dominated by infaunal and semi-infaunal suspension feeders, with a near-absence of free-living epifaunal bivalves. In contrast, after the positive shift of the 313Corg, the assemblage suggests shallower depths and higher energy levels.
CRETACEOUS RESEARCH
(2024)
Article
Geology
Lili Xu, Dengfeng He, Xianfeng Zha, Chaobin Hu, Zuochen Li, Meng Li, Xiaofeng Gao, Xianzhi Pei
Summary: This study investigated the tectonic setting and skarnization mechanism of the Yugusayi monzodiorite intrusion in the North Qimantagh Belt. The findings provide key constraints on the initial subduction of the Qimantagh back-arc basin's oceanic crust and offer an opportunity to explore the Caledonian skarnization in the Qimantagh Belt.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geology
Tian Yang, Xiaofang Li, Yu Yang, Long Wen, Zhenglin Cao, Xiaojuan Wang, Shaomin Zhang, Qiangshao Liang
Summary: This study successfully distinguishes the depositional characteristics of shallow-water deltas and fluvial fans in the Middle Jurassic Shaximiao Formation in the central Sichuan Basin. The research provides insights into the sedimentary evolution of these deposits using various methods such as core observations and seismic analyses.
Article
Geology
Kevin Moreau, Simon Andrieu, Justine Briais, Benjamin Brigaud, Magali Ader
Summary: This study investigates the deposition and variation of lacustrine and palustrine carbonate facies in the Paris Basin by analyzing carbonate isotopes, facies, petrography, and sequence stratigraphy. It identifies two distinct facies models, a coastal lacustrine system and an inland lacustrine system, and provides insights into the factors controlling their heterogeneities.
DEPOSITIONAL RECORD
(2023)
Review
Geography, Physical
Shengtao Lan, Bin Cao, Yan Hu, Ziyong Sun, Rui Ma, Xin Li
Summary: Talus, a common landform in the mountain periglacial environment, has significant cooling effects. These effects are important for mitigating degradation of underlying permafrost. However, there is limited research and observation on the cooling effects of blocky debris in nature. Therefore, increased observations and process-based models are needed to better understand the extent of the cooling effects and its impact on the thermal regime of permafrost.
PERMAFROST AND PERIGLACIAL PROCESSES
(2023)
Article
Geology
P. H. Cornard, G. Degenhart, P. Tropper, J. Moernaut, M. Strasser
Summary: This study focuses on the application of micro-computed tomography in analysing sedimentary structures in lithified deposits. It demonstrates the potential of micro-CT in visualizing sedimentary structures and evaluating the physical properties of sandstones. By separating particles based on their CT density, the coarsest fraction underlying the sedimentary structures can be isolated. The study emphasizes the importance of considering mineralogical composition and grain sorting in interpreting structureless deposits.
DEPOSITIONAL RECORD
(2023)
Article
Geology
Michal Czernielewski
Summary: The fossil tooth material collected at the Upper Pliocene site of Wee 2 in southern Poland includes specimens of Pliopetaurista dehneli, Tamias orlovi, Blackia miocaenica, and Sciurus warthae. The discovery of Blackia miocaenica at Wee 2 represents one of the youngest occurrences of this species in the fossil record.
GEOLOGICAL QUARTERLY
(2023)
Article
Geology
Carson Kinney, Jillian Kendrick, Manuel Duguet, Chris Yakymchuk
Summary: Heat generated from the decay of K, Th, and U is crucial for the differentiation and stability of Earth's continental crust. This study focuses on the archean cratons and uses modeling techniques to understand the partitioning of heat-producing elements during anatexis of metabasites as well as its effect on metamorphic timescales and the production of tonalite-trondhjemite-granodiorite (TTG) suites.
JOURNAL OF METAMORPHIC GEOLOGY
(2023)
Article
Geology
Kristian Svennevig, Matthew J. Owen, Michele Citterio, Tove Nielsen, Salik Rosing, Jan Harff, Rudolf Endler, Mathieu Morlighem, Eric Rignot
Summary: Rock avalanche-triggered displacement waves have been observed in Greenland and Alaska, indicating the presence of such hazards in polar regions. A study in the Vaigat strait of western Greenland found that the magnitude of gigascale subaerial rock avalanches impacting a partially confined water body was much larger than historical rock avalanches. The suggested assessment of hazard events should include both historical records and geological events from the recent past.
Article
Geology
Musa B. Usman, David W. Jolley, Alexander T. Brasier, Adrian J. Boyce
Summary: This study integrated data on microplankton abundances, stable carbon isotopes, and sedimentology to investigate the Trans-Sahara Seaway during the Cretaceous period. The findings provide evidence of oceanic anoxic event 2 and reveal paleoenvironmental trends linked to sea-level change, as indicated by sedimentological and microplankton diversity changes.
DEPOSITIONAL RECORD
(2023)
Article
Geology
Jinheng Sun, Ni Li, Yongwei Zhao, Wanfeng Zhang, Jun Hu
Summary: This study investigates the contribution of sediments, depleted mantle, and altered oceanic crust to the genesis of the Abaga basalts. The results suggest that the basaltic melts were more oxidized, possibly due to the addition of sediments and oceanic crust.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geology
Ali A. Sepahi, Batool Nemati, Abbas Asiabanha, David R. Lentz, Chris R. M. Mcfarlane
Summary: The Takestan area in the western part of the Alborz magmatic arc consists of plutonic rocks, effusive volcanic rocks, and pyroclastic rocks. Through U-Pb zircon LA ICP-MS dating, it is concluded that the majority of the Takestan plutonic rocks were formed during the Late Eocene, with ages ranging from 41-39 Ma, while a smaller portion has ages around 37 Ma. The dacitic rocks have an age of approximately 39 Ma, while the rhyolitic rocks are the youngest in the region, with ages ranging from 37-35 Ma. The presence of old zircons suggests the involvement of long-lived magma chambers and inheritance from older continental crust. The age of magmatic rocks in the western part of the Alborz magmatic arc decreases from east to west, and they are mostly limited to the Palaeogene period. These rocks were likely formed in a subduction-related tectonic environment, similar to other Palaeogene magmatic rocks in Iran.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geology
Chao Li, Jun Yan
Summary: This study investigates the geochemical compositions of apatite in representative I-type and A-type granitic intrusions in the eastern Jiangnan Orogen to understand their petrogenesis and polymetallic mineralization potential. The results reveal that apatites in these granitoids exhibit specific geochemical characteristics and can be classified into two groups. Quantitative calculation and modeling suggest that I-type granitic magmas are more volatile-rich and oxidized compared to A-type granitic magmas. Based on the relationship between intrinsic magmatic variables and ore-forming elements, the early I-type granitoids in the study area have a strong polymetallic mineralization potential, while the late A-type granites may have rare metal mineralization potential.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geology
Haozhong Zhu, Zhonghua Tian, Pinghua Liu, Wenyong Duan, Zhanghuang Ye
Summary: The interpretation and inversion of P-T paths of high-pressure and ultrahigh-pressure metamorphic rocks in the Sulu orogen provide insights into the subduction and exhumation histories of the region. This study presents the P-T paths of HP eclogites using petrography, mineral chemistry, and pseudosection modelling. The results show clockwise P-T paths with peak conditions of P >= 21.3 kbar, T >= 755 degrees C and P >= 23.0 kbar, T >= 871 degrees C. Combined with geological data, the findings suggest subduction of the South China plate to the North China craton before 240 Ma, followed by HP eclogite metamorphism and subsequent exhumation with partial melting around 220-200 Ma.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geology
R. H. Smithies, K. Gessner, Y. Lu, C. L. Kirkland, T. Ivanic, J. R. Lowrey, D. C. Champion, J. Sapkota, Q. Masurel, N. Thebaud, Quentin de Gromard
Summary: This study reveals the existence of evolved crust fragments up to 3.7 billion years old in the basement of Mesoarchean to Neoarchean greenstone basins in the Yilgarn craton. The new geochemical and isotopic data show a NE-to ENE-trending architecture in the pre-2.73 Ga crust, which challenges plate-tectonic models. The results suggest that the NNW-trending structures, although important in regional geology, may be an insignificant overprint of the primary ENE-trending architecture.
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
Geology
Sophie Decree, Etienne Deloule, Renata Barros, Julien Mercadier, Stefan Hoehn, Chantal Peiffert, Jean-Marc Baele
Summary: This paper investigates the content and sources of rare earth elements in phosphorites from Belgium and explores the processes that control their distribution. Petrological, mineralogical, and isotopic analyses are used to understand the changes in apatite chemistry during phosphogenic events.
Article
Geology
Rebecca G. Englert, Stephen M. Hubbard, Brian W. Romans, Sebastian Kaempfe, Daniel Bell, Paul R. Nesbit, Lisa Stright
Summary: This study characterizes the sedimentology and architecture of an Upper Cretaceous intraslope fan succession deposited within an extensional, fault-bound minibasin from the Tres Pasos Formation, Chile. Results show that metre-scale topographic features can substantially alter the flow properties of stratified turbidity currents, and their downslope flow evolution in an intraslope setting to include transformations in flow regimes and the development of transitional, depositional and flow-stripped sediment gravity currents.
DEPOSITIONAL RECORD
(2023)
