Article
Geosciences, Multidisciplinary
Clinton Barineau, Douglas A. Sagul, Paul A. Mueller
Summary: In the southern Appalachian region, it is recognized that Ordovician and Silurian siliciclastic, volcanic, and plutonic rocks are part of a paired arc/back-arc system that formed on the seaward edge of the Laurentian plate. New crystallization ages confirm rapid deposition in an Ordovician-Silurian extensional basin that received input from continentally derived Mesoproterozoic crust and bimodal volcanic components. The ages of zircons suggest a significant Mesoproterozoic component in the genesis of these rocks.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geography, Physical
Chengsheng Jin, Zhiwei Liao, Gary G. Lash
Summary: The study suggests that fluctuations in redox conditions, in addition to commonly cited thresholds of bimetal ratios, may have influenced the redox trends during the Ordovician-Silurian transitional interval. The strong correlation between changing redox conditions and fossil distributions implies that dynamic and ferruginous conditions contributed to biotic crises. The coupling of total organic carbon (TOC) and redox proxies highlights the importance of prolonged anoxia or euxinia in the accumulation and preservation of organic matter.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Multidisciplinary Sciences
Xianqing Jing, Zhenyu Yang, Ross N. Mitchell, Yabo Tong, Min Zhu, Bo Wan
Summary: This study reports a large and fast true polar wander event that occurred 450-440 million years ago and provides evidence based on paleomagnetic data and paleopoles from major continents. The study also suggests that this event can explain the migration of glacial centers and the mass extinction at the end of the Ordovician period.
NATURE COMMUNICATIONS
(2022)
Article
Geography, Physical
Yangbo Lu, Jun Shen, Yuxuan Wang, Yongchao Lu, Thomas J. Algeo, Shu Jiang, Detian Yan, Qiyang Gou
Summary: The Late Ordovician mass extinction (LOME) occurred in two discrete pulses, linked to environmental stresses caused by the onset and termination of the Hirnantian Glaciation. Recent studies have suggested a potential connection between LOME and massive volcanism during the Ordovician-Silurian transition (OST), based on significant mercury anomalies in the South China region. However, the study finds that volcanic activity in South China during the OST was a regional phenomenon, and there is a discrepancy between the distribution of bentonite beds and the overall redox evolution in the region. Mercury isotope analysis suggests that seawater was the source of mercury enrichment during the OST. Therefore, the LOME may not have been caused by massive volcanism, but rather by long-term cooling, weathering, anoxia, and marine eutrophication.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Gultekin Topuz, Osman Candan, Jia-Min Wang, Qiu-Li Li, Fu-Yuan Wu, Ali Yilmaz
Summary: The Anatolide-Tauride block in the Tethyan belt was a passive northern continental margin of Gondwana in the Paleozoic era. A relatively large metaquartz-syenite to -granite complex was discovered in the Eastern Anatolia, with distinct igneous textures and geochemical characteristics typical of A-type syenite to granite. Isotopic analysis indicated a derivation from high-temperature mantle magmas without significant crustal assimilation. The Late Ordovician-Silurian A-type igneous rocks in this region were likely related to a rifting event at the northern margin of Gondwana, leading to the opening of the Paleo-Tethys.
Article
Geosciences, Multidisciplinary
Zisang Huang, Zhongquan Li, Wenrui Shi, Xiyan Yang, Xingzhi Wang, Steven Young
Summary: This study reconstructs the sedimentary mechanisms of shale in the southern Sichuan Basin by combining logging, mineralogy, and geochemistry. The study found that the shale in the area can be divided into different sequences, which are influenced by factors such as volcanic eruption and glaciation, leading to different sedimentary environments and lithofacies. This has significant implications for the development and exploration of shale gas.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Environmental Sciences
Jie Long, Shixi Zhang, Kunli Luo
Summary: Molybdenum enrichment in Ordovician and Silurian stone coals in central China shows great potential as an alternative source of molybdenum, with concentrations 99 times higher than the global average. Future studies should focus on the ecological effects and cost savings of molybdenum extraction from stone coal.
Article
Geochemistry & Geophysics
P. Kosakowski, A. Zakrzewski, M. Waliczek
Summary: The Baltic Syneclise is a Paleozoic basin along the western margin of the East European Craton, where commercial amounts of hydrocarbons have been found. Good quality source rocks in the Middle-Upper Cambrian and Tremadocian bituminous shales have contributed to conventional and unconventional hydrocarbon explorations in the region. Geochemical analyses indicate overall good to very good source rock quality in the Middle-Late Ordovician and Early Silurian horizons.
Article
Geosciences, Multidisciplinary
Morteza Derakhshi, Richard E. Ernst, Sandra L. Kamo
Summary: This study reports for the first time a series of voluminous intraplate volcanic events in Iran, which may be a key factor contributing to the Late Ordovician mass extinction (LOME). The volcanic events occurred during the initial rifting of the Paleotethys Ocean and have been identified through fieldwork and dating techniques. The researchers suggest that these volcanic activities represent remnants of a newly proposed Large Igneous Province (LIP) and played a significant role in the environmental and climatic changes associated with LOME.
Article
Automation & Control Systems
An Wan, Yixuan Wang, Guijun Xue, Ken Chen, Jing Xu
Summary: This article proposed a method to improve the kinematics calibration accuracy of machine tools by using laser tracker with angle selection and measurement weightings at a single station. The method is based on the anisotropic and in-homogeneous measurement property of the laser tracker, aiming to enhance orientation calibration accuracy and position calibration accuracy. Simulations and experiments were conducted to demonstrate the effectiveness of the proposed method in improving the accuracy of kinematics calibration.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Geosciences, Multidisciplinary
Licai Song, Qing Chen, Huijun Li, Changzhou Deng
Summary: This study provides a high-resolution, multi-proxy record of mercury variations in the Yangtze Platform, South China, and reveals four distinct stages of the atmospheric-terrestrial-oceanic-climatic system during the Ordovician-Silurian transition. Two major volcanic events are found to be closely associated with climate changes, which have significant implications for the Late Ordovician Mass Extinction.
GEOSCIENCE FRONTIERS
(2023)
Article
Nuclear Science & Technology
Riccardo Cocci, Guillaume Damblin, Alberto Ghione, Lucia Sargentini, Didier Lucor
Summary: This paper presents a methodology called Bayesian calibration for the development, validation, and uncertainty quantification of closure laws in thermal-hydraulic system codes. It introduces a robust and reliable assessment, selection, and uncertainty quantification of physical models by tuning parameters and selecting the best-suited model based on statistical indicators. The paper also discusses the application of this methodology to condensation heat transfer correlations.
ANNALS OF NUCLEAR ENERGY
(2022)
Article
Geosciences, Multidisciplinary
David J. Holloway, Maxwell R. Banks, Doris M. Banks
Summary: Thirteen species of trilobites from late Katian and Rhuddanian strata in the Arndell Sandstone of the Florentine Valley in southern Tasmania are described. The faunal affinities of the trilobites suggest links with terranes along the north-western margin of Gondwana, South America in the Late Ordovician, South China and possibly Laurentia in the early Silurian.
BULLETIN OF GEOSCIENCES
(2022)
Article
Energy & Fuels
Hu Wang, Zhiliang He, Shu Jiang, Yonggui Zhang, Haikuan Nie, Hanyong Bao, Yuanping Li
Summary: The formation process of bedding fractures is jointly controlled by sedimentary characteristics, hydrocarbon generation, and tectonic movement. Studying the formation process of bedding fractures is of great significance for selecting a suitable method to identify them and effectively using them to form complex fracture networks in the fracturing process to improve shale oil and gas recovery.
Article
Engineering, Electrical & Electronic
Abdallah M. Karmalawi, Alaaeldin A. Abdelmageed
Summary: The radiometry laboratory at NIS has improved spectral responsivity facilities for optical detector measurements, utilizing lamp-monochromator setups with silicon and InGaAs detectors to extend into the infrared range. The uncertainty contribution for silicon-based detectors is less than 1-1.9% in the 300-1100 nm range, and for InGaAs-based detectors it is about 2-3.8% in the 800-1600 nm range. The facilities are now fully automated and controlled by LabVIEW.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Biology
Michael O. Day, Jahandar Ramezani, Samuel A. Bowring, Peter M. Sadler, Douglas H. Erwin, Fernando Abdala, Bruce S. Rubidge
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2015)
Article
Geochemistry & Geophysics
Allen F. Glazner, Peter M. Sadler
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2016)
Article
Geology
Camille A. Partin, Peter M. Sadler
Article
Biodiversity Conservation
James Boyle, H. David Sheets, Shuang-Ye Wu, Daniel Goldman, Michael J. Melchin, Roger A. Cooper, Peter M. Sadler, Charles E. Mitchell
Article
Multidisciplinary Sciences
James S. Crampton, Roger A. Cooper, Peter M. Sadler, Michael Foote
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2016)
Article
Geosciences, Multidisciplinary
Jahanbakhsh Daneshian, Leila Ramezani Dana, Peter Sadler
JOURNAL OF AFRICAN EARTH SCIENCES
(2017)
Article
Geosciences, Multidisciplinary
Peter M. Sadler
BULLETIN OF GEOSCIENCES
(2012)
Article
Geosciences, Multidisciplinary
Roger A. Cooper, Peter M. Sadler, Axel Munnecke, James S. Crampton
GEOLOGICAL MAGAZINE
(2014)
Article
Geology
James T. Boyle, H. David Sheets, Shuang-Ye Wu, Daniel Goldman, Michael J. Melchin, Roger A. Cooper, Peter M. Sadler, Charles E. Mitchell
Article
Biodiversity Conservation
Roger A. Cooper, Peter M. Sadler
Article
Biodiversity Conservation
Yue Wang, Peter M. Sadler, Shu-zhong Shen, Douglas H. Erwin, Yi-chun Zhang, Xiang-dong Wang, Wei Wang, James L. Crowley, Charles M. Henderson
Article
Geology
Peter M. Sadler, Roger A. Cooper, Michael J. Melchin
PROCEEDINGS OF THE YORKSHIRE GEOLOGICAL SOCIETY
(2011)
Article
Multidisciplinary Sciences
Shu-zhong Shen, James L. Crowley, Yue Wang, Samuel A. Bowring, Douglas H. Erwin, Peter M. Sadler, Chang-qun Cao, Daniel H. Rothman, Charles M. Henderson, Jahandar Ramezani, Hua Zhang, Yanan Shen, Xiang-dong Wang, Wei Wang, Lin Mu, Wen-zhong Li, Yue-gang Tang, Xiao-lei Liu, Lu-jun Liu, Yong Zeng, Yao-fa Jiang, Yu-gan Jin
Article
Geology
David B. Kemp, Peter M. Sadler
Article
Geology
Robert M. Easton, Octavian Catuneanu, Art D. Donovan, Richard H. Fluegeman, A. P. (Tony) Hamblin, Howard Harper, Norman P. Lasca, Jared R. Morrow, Randall C. Orndorff, Peter Sadler, Robert W. Scott, Berry H. (Nick) Tew