Article
Geography, Physical
J. P. Galve, G. E. Alvarado, J. Perez-Pena, N. Perez-Consuegra, P. Ruano, L. Becerril, S. Devoto, C. Reyes-Carmona, J. M. Azanon
Summary: Megafans are landforms and sedimentary bodies formed by rivers that regularly change their courses. The formation and evolution of these megafans are closely related to the processes that cause the river avulsions. This study of the Santa Clara Megafan in Costa Rica suggests that major shifts in the main rivers of the megafan are correlated with strong volcanic eruptions. The findings provide insights into the formation of megafans through non-climatic processes and have implications for archaeological studies and lahars hazard assessments.
Article
Geology
Natasha Dowey, Rebecca Williams
Summary: This study analyzes a novel hybrid pyroclastic lithofacies found in Tenerife and Pantelleria, which reveals a fuller spectrum of hybrid deposition than previously reported, highlighting the importance of recognizing hybrid deposition in the rock record and hazard modeling.
Article
Geology
Qianqi Zhang, Bo Wang, Daran Zheng, Jiahao Li, Xueheng Wang, Edmund A. Jarzembowski, Chunpeng Xu, Ting Li, Haichun Zhang, Michael S. Engel
Summary: Resource pulses play a significant role in nutrient transport between aquatic and terrestrial ecosystems. The discovery of complex mayfly mating-swarm behavior in the Early Jurassic highlights the ecological significance of insects in deep-time terrestrial ecology.
Article
Astronomy & Astrophysics
Ignatius Argadestya, Abduljamiu O. Amao, Candice C. Bedford, Pantelis Soupios, Khalid Al-Ramadan
Summary: This study investigates the mineralogical, elemental, and spatial variability in volcaniclastics from the Merapi basalt-andesitic stratovolcano in Java, Indonesia. Statistical analysis helps differentiate between different depositional environments like fluvial, fluvio-coastal-aeolian, and marine influenced deposits.
EARTH AND SPACE SCIENCE
(2022)
Article
Environmental Sciences
Meihui Liu, Yao Du, Yamin Deng, Yueping Li, Yanqiu Tao, Yiqun Gan, Teng Ma
Summary: This study investigates the effect of depositional evolution on phosphorus enrichment in aquifer sediments in a high P groundwater area. The results show that sedimentary facies and paleo-climate jointly control the content of organic phosphorus and Fe-bound inorganic P, which significantly affects total P content in aquifer sediments. The rapid accumulation of alluvial sediments and the evolution of Dongting Lake have led to a large amount of organic matter and P burial, posing a serious threat to groundwater quality.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
I. M. Boothroyd, F. Worrall, C. S. Moody, G. D. Clay, G. D. Abbott, R. Rose
Summary: The reduction of sulfate (SO42-) serves as an alternative terminal electron acceptor for organic matter oxidation in peat soils. A study in the North Pennines, England estimated a 23-year sulfur (S) budget for a blanket bog-covered catchment, showing a significant decline in atmospheric deposition of total S, long term accumulation of S in deep peat, and the peatland's capability of net removal of atmospheric S deposition.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Water Resources
Erik Schiefer, Jason Geck, Johnse S. Ostman, Nicholas P. McKay, Nore Praet, Michael G. Loso, Darrell S. Kaufman
Summary: Suspended sediment delivery and deposition in proglacial lakes are sensitive to various hydrometeorologic and geomorphic controls. The study at Eklutna Lake in Alaska highlights the influences of discharge, intra-annual variations, meteorological controls, and subcatchment glacierization on sediment transfer, with a correlation between flood turbidites and specific regional storms. The sediments deposited in Eklutna Lake show discontinuous varves with distinctive turbidites, and within-lake spatial modeling demonstrates variable rates of sediment thinning and focusing effects.
HYDROLOGICAL PROCESSES
(2021)
Article
Geosciences, Multidisciplinary
Zhiyuan Zhang, Changsong Lin, Yongfu Liu, Jingyan Liu, Haitao Zhao, Hao Li, Qi Sun, Hui Xia, Ming Ma, Ying Liang
Summary: This study presents a detailed analysis of the Lower Cretaceous formations in the northern Tarim basin, highlighting the sequence stratigraphy, depositional architecture, and sedimentary infilling process, as well as the controlling factors. The identification of major depositional facies and sequences provides insights into the evolution of the depositional system in the study area. The findings contribute to the understanding of the potential favorable reservoirs in the region.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Hongfei Zhao, Yunhong Lin, Jie Zhou, Claudio O. Delang, Hongming He
Summary: The study reconstructs the spatial and temporal distribution of precipitation and vegetation cover in the Yellow River basin during the Holocene, and simulates soil erosion and sediment deposition processes. The findings demonstrate the impacts of climate change and human activities on the evolution of the fluvial landscape.
Article
Energy & Fuels
Dongyu Zheng, Mingcai Hou, Anqing Chen, Hanting Zhong, Zhe Qi, Qiang Ren, Jiachun You, Huiyong Wang, Chao Ma
Summary: Lithofacies identification is critical for hydrocarbon explorations, and traditional methods are time-consuming and bias-prone. This study successfully applied machine learning in lithofacies identification in the Yuanba Area of southwestern China, achieving high accuracy and short training time.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Environmental
Kunfu Pi, Philippe Van Cappellen, Yiqun Gan, Xinlin Zhong, Lei Tong, Weitao Chen, Xun Wang, Yanxin Wang
Summary: The research reveals that in the northern mollisol agroecosystems, the regional river systems draining the Lesser Khingan Mountains become the hotspots of selenium (Se), where piedmont Se-rich oil shales are the most probable source of regional Se. Mollisol organic matter is the major host for Se, while Fe oxides have a subordinate role in Se retention.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Qi Zhong, Jian-Guo Zhang, Dong Tang, Jian-Hui Jiang, Jing-Jing Shen, Mu-Xin Cai, Pin-Xie Li
Summary: This study reviews the sources, depositional mechanism, and evolution process of lacustrine mudrock and emphasizes the influence of astronomical cycles on its deposition. By investigating existing literature and actual data, the study analyzes the effects of various orbital parameters on mudrock deposition at different scales. Furthermore, the study proposes the application of high-precision isochronous stratigraphic correlation to guide shale oil and gas exploration. In conclusion, this study provides a new perspective for the research on sedimentation of fine-grained sedimentary rocks.
JOURNAL OF PALAEOGEOGRAPHY-ENGLISH
(2022)
Article
Geography, Physical
Lucas Gerardo Dominguez Ruben, Ricardo Nicolas Szupiany, Carlos Ramonell, Micaela Ru, Marcelo Horacio Garcia
Summary: This study provides a comprehensive and novel analysis approach combining satellite imagery treatment and aerial photographs with detailed field measurements to describe the deltaic processes and the main variables that control the evolution of the major fluvial-lacustrine delta along the Middle Parana River floodplain. The results show that factors such as local geology, hydro-sedimentological behavior of channels, sediment transport modes, and vegetation growth influence the delta formation and floodplain construction in this particular environment.
EARTH SURFACE PROCESSES AND LANDFORMS
(2023)
Article
Chemistry, Multidisciplinary
Mark E. Brigham, David D. VanderMeulen, Collin A. Eagles-Smith, David P. Krabbenhoft, Ryan P. Maki, John F. DeWild
Summary: Long-term monitoring has shown that despite reductions in mercury emissions in the United States and Canada since 1990, contamination in fish from remote lakes and rivers still exists. However, the study suggests that regional to continental-scale decreases in mercury and sulfate emissions have benefitted aquatic resources.
APPLIED SCIENCES-BASEL
(2021)
Article
Geosciences, Multidisciplinary
M. Kollegger, J. Lorenzo-Trueba, A. M. Fernandes, A. Singh, A. Abeyta
Summary: This study provides experimental evidence for the delayed response of the upstream portion of river deltas to sea-level changes, emphasizing the potential net erosion during sea-level rise and complicating the reconstruction of paleo sea-level from deltaic deposits.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Youngbeom Cheon, Hyeongseong Cho, Sangmin Ha, Hee-Cheol Kang, Jong-Sun Kim, Moon Son
JOURNAL OF ASIAN EARTH SCIENCES
(2019)
Article
Geosciences, Multidisciplinary
Jisu Kim, Young Kwan Sohn
GEOSCIENCES JOURNAL
(2020)
Article
Geosciences, Multidisciplinary
Hyun-Ok Choi, Sung Hi Choi, Youn Soo Lee, Jong-Sik Ryu, Der-Chuen Lee, Seung-Gu Lee, Young Kwan Sohn, Jia-qi Liu
Article
Multidisciplinary Sciences
Miroslaw Masojc, Ju Yong Kim, Joanna Krupa-Kurzynowska, Young Kwan Sohn, Maciej Ehlert, Grzegorz Michalec, Marzena Cendrowska, Eric Andrieux, Simon J. Armitage, Marcin Szmit, Ewa Dreczko, Jin Cheul Kim, Ji Sung Kim, Gwang-Soo Lee, Piotr Moska, Modather Abdalla Jadain
Summary: The EDAR 7 site in the Atbara region of Sudan provides a unique opportunity to study and date Acheulean stone tools, shedding light on the behavior of ancient humans in the Sahara region. The site has delivered a complete Acheulean knapping chaine operatoire and provides new information about the Saharan Acheulean, showing evidence of Homo erectus occupation during Middle Pleistocene humid periods.
Article
Geosciences, Multidisciplinary
S. Y. Go, Y. K. Sohn
Summary: This study provides a detailed investigation of vesiculated tuff in Songaksan tuff ring, Jeju Island, Korea, compared to non-vesiculated tuffs. Vesiculated tuff, emplaced by wet pyroclastic surges, differs from non-vesiculated tuffs in sorting, particle content, and porosity. The formation of vesicles in granular substances is linked to water saturation and thermal disequilibrium during pyroclastic surges.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Jong Ok Jeong, Hyeon-Seon Ahn, Moon Son, Hyeongseong Cho, Young Kwan Sohn
Summary: Low-aspect-ratio ignimbrites, thin but laterally extensive, serve as good stratigraphic markers in sedimentary basins. This study of the Kusandong Tuff in Korea uses rock-magnetic analyses to reveal variations in magnetic susceptibility and magnetic mineral composition, suggesting the ignimbrite is formed by accumulation of multiple cooling units. The research also indicates a possible convection-dominated behavior in pyroclastic current dynamics.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Jong Ok Jeong, Yongmun Jeon, Young Kwan Sohn
Summary: Research shows that the Southern Kusandong Tuff was formed by two pyroclastic density currents generated by synchronous eruptions of two volcanoes in the nearby volcanic arc. This paired seismic-volcanic event raises concerns for intensified volcanic hazards over large areas in regions of clustered volcanoes.
Article
Archaeology
Grzegorz Michalec, Marzena Cendrowska, Eric Andrieux, Simon J. Armitage, Maciej Ehlert, Ju Yong Kim, Young Kwan Sohn, Joanna Krupa-Kurzynowska, Piotr Moska, Marcin Szmit, Miroslaw Masojc
Summary: The paper presents the results of an analysis of a late Acheulean horizon discovered at the EDAR 135 site in the Eastern Desert of Sudan. The lithic assemblage found there is potentially the youngest trace of the Acheulean in northeastern Africa, with technological analysis revealing different core reduction strategies. Microwear traces on lithic artifacts suggest on-site butchering activities.
JOURNAL OF FIELD ARCHAEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Boo-Keun Khim, Young Kwan Sohn, Min Kyung Lee, Sunghan Kim, Jae Il Lee, Kyu Cheul Yoo
Summary: Glaciomarine laminated muds around the Antarctic continental margin play an important role in understanding ice sheet dynamics. A study of the laminated muds in the Central Basin of the Ross Sea reveals that the bright laminae contain terrigenous particles, diatom fragments, and eroded mud lumps with fossils, while the dark laminae are clayey and biogenic with tiny pieces of fossils. These muds are interpreted to have been deposited by subglacial meltwater plumes, indicating the recycling of biogenic particles from older deposits.
Article
Environmental Sciences
Gi Bom Kim, Shane J. Cronin, Jong Ok Jeong, Sun Young Go, Youn Soo Lee, Jiaqi Liu, Young Kwan Sohn
Summary: Melt inclusions play a role in volcanic eruptions by increasing the volume of erupting magma, and they also influence the chemical composition of volcanic ash.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
Yongmun Jeon, Ki Hwa Park, Young Kwan Sohn
Summary: Jeju Island is composed of various volcanic cones and their deposits, which were formed on the Yellow Sea continental shelf under fluctuating sea levels. The characteristics of these volcanic cones and their deposits indicate the presence of different types and features of diatremes in shallow underwater conditions.
BULLETIN OF VOLCANOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Seon In Park, Jong Ok Jeong, Young Kwan Sohn
Summary: Dokdo is an erosional remnant of an oceanic intraplate volcano off the Korean peninsula. The island is composed of basaltic and trachytic volcaniclastic rocks, with the Dongdo Tuff representing submarine to subaerial debris flows and the Seodo Tuff representing block-and-ash flows. The tuffs provide insights into the trachytic volcanism associated with the post-shield stage of oceanic intraplate volcanoes.
BULLETIN OF VOLCANOLOGY
(2022)
Article
Archaeology
Miroslaw Masojc, Ahmed Nassr, Ju Yong Kim, Maciej Ehlert, Grzegorz Michalec, Joanna Krupa-Kurzynowska, Young Kwan Sohn, Eric Andrieux, Simon J. Armitage, Marcin Szmit, Jin Cheul Kim, Ji Sung Kim, Marzena Cendrowska, Ewa Dreczko, Piotr Moska, Kyeong Ja Kim, Yire Choi
Summary: The research note presents evidence of the oldest Middle Pleistocene human activity in the Eastern Desert Atbara River (EDAR) area in Sudan, with preliminary results indicating Homo sapiens activity during MIS 5 and Homo erectus activity during MIS 7-n or earlier.
JOURNAL OF AFRICAN ARCHAEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Seungwon Shin, Hyeongseong Cho, Hee-Cheol Kang, Hyoun Soo Lim, Hyun Joo Kim, Daekyo Cheong, In Sung Paik, Jong-Sun Kim, Young-Rok Park, Kyoung-Nam Jo
JOURNAL OF THE GEOLOGICAL SOCIETY OF KOREA
(2020)
Article
Multidisciplinary Sciences
Chanwoo Sohn, Young Kwan Sohn
SCIENTIFIC REPORTS
(2019)