Article
Geosciences, Multidisciplinary
Shun Muto, Satoshi Takahashi, Masafumi Murayama
Summary: Using X-ray computed microtomography, we identified a dominant conodont fauna across the Carboniferous-Permian boundary in a pelagic chert-claystone succession in Northeast Japan, suggesting a change in ecological dominance in the deep waters.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Computer Science, Information Systems
Eleni Vrochidou, George K. Sidiropoulos, Athanasios G. Ouzounis, Anastasia Lampoglou, Ioannis Tsimperidis, George A. Papakostas, Ilias T. Sarafis, Vassilis Kalpakis, Andreas Stamkos
Summary: This work provides a comprehensive study on marble crack segmentation using deep learning techniques. The authors propose efficient network architectures and feature extraction methods, making an important contribution to addressing the problem of marble crack segmentation.
Article
Oceanography
Beatriz E. Mejia-Mercado, Amy R. Baco
Summary: Deep-sea fishes on seamounts have shown strong changes in assemblage patterns with depth, but little is known about horizontal variability patterns within a single seamount and among seamounts. This study explored three seamounts in the Papahānaumokuākea Marine National Monument using Autonomous Underwater Vehicles, and found significant differences in fish assemblages between seamounts and sides at different depths.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2023)
Article
Geosciences, Multidisciplinary
Hugo S. Yamassaki, Fernando F. Vesely
Summary: The study analyzed the geomorphological evolution and architecture of the Maric ' a deep-sea fan in the northern Santos Basin offshore SE Brazil, mapping five horizons using three-dimensional seismic data and well logs. The research revealed major geomorphologic transformations of the deep-sea fan from inception to abandonment, identifying six lobes with varying growth patterns and stratigraphic signatures indicative of different deposition processes. The results showed that the channel network and sand-body architecture evolve predictably controlled by fan aggradation.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Engineering, Geological
Xingsen Guo, Zhenwen Liu, Jiewen Zheng, Qianyu Luo, Xiaolei Liu
Summary: This study analyzed the penetration mechanism of a T-bar in deep-sea surficial sediments using computational fluid dynamics. It proposed a methodology to evaluate the undrained shear strength of deep-sea sediments and established corresponding equations. This provides a basis for marine engineering geology survey, engineering construction, and hazard assessment.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Environmental Sciences
Liling Liu, Xiaolong Dong, Wenming Lin, Shuyan Lang
Summary: Scatterometers are used for monitoring sea surface wind vectors, but they also have applications in polar sea ice detection. This paper explores the effectiveness of a new type of scatterometer, the rotating fan beam scatterometer, using the China France Oceanography Satellite scatterometer (CSCAT) as an example. A Bayesian method considering the geometric characteristics of CSCAT is developed for sea ice detection.
Article
Geochemistry & Geophysics
Daniel E. Ibarra, Anastasia G. Yanchilina, Max K. Lloyd, Katharina A. Methner, C. Page Chamberlain, Ruth Yam, Aldo Shemesh, Daniel A. Stolper
Summary: The oxygen isotopic composition of silica preserved in oceanic sediments has been studied in this research. The results show that the transformation and recrystallization processes of biogenic opal-A to opal-CT to microquartz in deep sea sediments have significant effects on the triple oxygen isotopic composition of chert. The findings suggest that the local temperature gradients and pore fluid oxygen isotopic compositions influence the measured values of chert, deviating from triple oxygen isotopic equilibrium with seawater.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Energy & Fuels
Ke Zhang, Sheng-He Wu, Jun-Jie Wang, Yun-Jie Xu, Zhen-Hua Xu, Jia-Jia Zhang
Summary: Experimental results showed that steeper slope, greater discharge, higher sediment/water ratio, and coarser sediment induced a fining-upward trend of mouth bar, while gentler slope, smaller discharge, lower sediment/water ratio, and finer sediment exhibited a coarsening-upward trend dominated by friction-dominated effluent.
Review
Environmental Sciences
Eva Paulus
Summary: The deep sea is one of the most biodiverse habitats on Earth, but is facing threats from human activities. Despite many mysteries remaining, there are challenges such as overfishing and environmental degradation that must be addressed to protect biodiversity in the deep sea.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Multidisciplinary Sciences
Andrei Ichaso, Luis A. Buatois, M. Gabriela Mangano, Patty Thomas, Don Marion
Summary: This study investigates the impact of the Agronomic Revolution on marginal-marine environments by analyzing Middle Cambrian fan-delta deposits in southwestern Saskatchewan. The findings suggest that environmental stressors affected trace-fossil distribution and bioturbation intensities in Cambrian fan deltas. The results provide evidence of a significant landward expansion of the Agronomic Revolution under stable environmental conditions, both in subaqueous fan delta and transgressive deposits.
SCIENTIFIC REPORTS
(2022)
Editorial Material
Ecology
Laura Kaikkonen, Elina A. Virtanen
Summary: Coastal mineral resources are promoted as a sustainable option to meet increasing metal demands, but shallow-water mining contradicts international conservation and sustainability goals, and its regulative legislation is still being developed, with no justifications in favour of shallow-water mining in the absence of thorough comparisons of different mining practices.
TRENDS IN ECOLOGY & EVOLUTION
(2022)
Article
Construction & Building Technology
Saqib Hussain, Musaad Zaheer Nazir Khan, Hammad Anis Khan
Summary: This article investigates the reduction of bond strength between concrete and BFRP bars. The results show that both alkaline solution and seawater trigger bond strength reduction between concrete and BFRP bars, with slightly higher bond strength retention compared to steel rebars.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Chemistry, Physical
Ahmad Aki Muhaimin, Mohamed Adel, Kohei Nagai
Summary: The study found that under sustained 60 MPa high water pressure, the residual compressive strength of concrete immediately decreases by 16% within 7 days, then remains stable up to 60 days. Under repeated high water pressure, the residual compressive strength gradually reduces by up to 40% until 60 cycles, then remains reasonably stable until 150 cycles. The bond strength between the steel bar and matrix decreases considerably under repeated cycles of 60 MPa water pressure, up to 26%.
Article
Geosciences, Multidisciplinary
Chenglin Gong, Haiqiang Wang, Dali Shao, Hongping Wang, Kun Qi, Xiaoyong Xu
Summary: Three individual subfan-growth cycles are recognized to form the Bengal Fan over time, each undergoing three main evolutionary stages: channel incision and amalgamation, vertical channel aggradation, and channel avulsion. These stages contribute to the development of a single channel levee-lobe system. The pinch-out of lobes and splays onto levees creates stratigraphic onlap traps with potential for large hydrocarbon accumulations.
Article
Geosciences, Multidisciplinary
Yintao Lu, Buqing Shi, Xiwu Luan, Guozhang Fan, Weimin Ran, Xiaoyong Xu, Hongxia Ma, Dali Shao, Liangbo Ding, Haiqiang Wang
Summary: The Bengal Fan is a deep-water sediment system with recently discovered biogenic gas reservoirs. The levee gas reservoir in this system has good thickness and porosity but low permeability due to high mud content. The gravity-flow sediment systems are linked to the source rock in this area and show enormous potential for petroleum exploration.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Simon Williams, Nicky M. Wright, John Cannon, Nicolas Flament, R. Dietmar Mueller
Summary: The reconstruction of past seafloor ages allows us to quantify changes in plate tectonic forces, surface heat flow, ocean basin volume, and global sea level over geological time. By exploring possible distributions of seafloor ages from the late Paleozoic to present, researchers have found that fluctuations in global sea level may be largely driven by changes in mean seafloor age.
GEOSCIENCE FRONTIERS
(2021)
Article
Geosciences, Multidisciplinary
Alexander Young, Nicolas Flament, Lisa Hall, Andrew Merdith
Summary: Research suggests that the subsidence history of Paleozoic Australian intracontinental basins may not only be influenced by far-field tectonic forces, but also by mantle-flow driven dynamic topography. The complex tectonic histories of intracontinental basins could potentially be explained by long-wavelength dynamic topography.
Article
Geosciences, Multidisciplinary
Benedicte Cenki, Patrice F. Rey, Diane Arcay, Julian Giordani
Summary: This article discusses the formation process of high to ultra-high temperature granulitic terranes, and evaluates the effects of geothermal conditions on their formation using analytical and numerical models. The results of the numerical experiments suggest that variations in radiogenic heat production and shortening rates play important roles in determining the geothermal conditions and rock formation.
Article
Geochemistry & Geophysics
Jonny Wu, Yi-An Lin, Nicolas Flament, Jeremy Tsung-Jui Wu, Yiduo Liu
Summary: This study reconstructs the tectonic evolution of the Northwest Pacific-Izanagi plate since the Cretaceous period using geological mapping and global tomography. The results indicate that the subduction of the Izanagi plate under Eurasia was relatively limited, mainly occurring between the Bohai Bay-Yellow Sea in China and northern Russia. The interaction between the vanished Izanagi plate and the Pacific plate had a significant impact on the tectonic evolution of Eurasia.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
Alexander Young, Nicolas Flament, Simon E. Williams, Andrew Merdith, Xianzhi Cao, R. Dietmar Muller
Summary: The sedimentary rock record suggests that global sea levels have changed by hundreds of meters throughout Phanerozoic times. This study develops a new framework to model sea level change, combining plate tectonic reconstructions and time-dependent models of past mantle flow. The results show the contributions of different solid Earth mechanisms to sea level change and are consistent with existing constraints and reconstructions.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Correction
Multidisciplinary Sciences
Nicolas Flament, Omer F. Bodur, Simon E. Williams, Andrew S. Merdith
Article
Multidisciplinary Sciences
Nicolas Flament, Omer F. Bodur, Simon E. Williams, Andrew S. Merdith
Summary: Plate tectonics plays a crucial role in shaping Earth's surface, with cold oceanic lithosphere sinking and hot mantle plumes rising. This study focuses on volcanic eruptions over the past 320 million years and their relationship to basal mantle structures. The findings suggest that the history of volcanism is statistically consistent with both mobile and fixed basal mantle structures, challenging previous assumptions.
Article
Multidisciplinary Sciences
Anton Grabreck, Nicolas Flament, Omer F. Bodur
Summary: Kimberlites, the main source of economic grade diamonds, are closely related to the basal mantle structures. The research shows that mobile lowermost mantle structures better match the reconstructed kimberlite eruption locations and major kimberlitic events, indicating the consistency between solid Earth dynamics and the kimberlite record.
Article
Geology
Luke S. Mondy, Patrice F. Rey, Guillaume Duclaux
Summary: This study investigates the formation mechanism of compressional episodes and phases of uplift during continental extension. The results show that rift basins tend to localize compressive stresses, with transient compressional stresses reaching up to 30 MPa. When sediment supply ceases, a profound depth inversion of 2 km magnitude occurs.
Article
Geosciences, Multidisciplinary
Omer F. Bodur, Gregory A. Houseman, Patrice F. Rey
Summary: Dynamic subsidence and uplift of plates can be explained by vertical motion of density anomalies in the mantle. However, recent research shows that vertical surface motions with rates greater than 100 m Myr(-1) and durations less than a few Myr can be explained by changes in basal shear stress caused by horizontal motion of a viscous plate relative to the asthenosphere. This model is applied to the mid-Eocene immersion of the southern margin of Australia.
Article
Geochemistry & Geophysics
Youseph Ibrahim, Patrice F. Rey
Summary: Warmer conditions in the hinterland facilitate local ductile flow, leading to prevalent Airy-like local isostasy. However, the regional response is better described by flexural isostasy. The interaction between horizontal tectonic mass transfer and vertical isostatic mass transfer impacts the architecture of fold and thrust belts.
Article
Geosciences, Multidisciplinary
oemer F. Bodur, Nicolas Flament
Summary: Most diamonds are transported to the Earth's surface from depths of around 120 km to 660 km by kimberlites, which are volatile-rich magmas. The locations where kimberlites erupted in the past 320 million years have been found to be related to large basal mantle structures at approximately 2,800 km depth as imaged by seismic imaging. Our global mantle convection models incorporating a basal layer of dense material driven by surface plate motions show that kimberlite magmatism is fueled by broad mantle upwellings occurring above basal mantle structures.
Article
Multidisciplinary Sciences
Tristan Salles, Laurent Husson, Patrice Rey, Claire Mallard, Sabin Zahirovic, Beatriz Hadler Boggiani, Nicolas Coltice, Maelis Arnould
Summary: Our study utilizes a global-scale landscape evolution model to reconstruct past landscapes and geological processes, incorporating paleoelevation and paleoclimate reconstructions. This model provides continuous quantification of critical metrics for understanding Earth's system, such as global physiography and sediment flux. We reevaluate the role of surface processes in controlling sediment delivery to the oceans and identify stable sedimentation rates during the Cenozoic period with distinct phases of sediment transfer from land to marine basins. Our simulation serves as a tool for identifying inconsistencies in previous interpretations of the geological record and available paleoelevation and paleoclimatic reconstructions.
Article
Geochemistry & Geophysics
R. Dietmar Muller, Nicolas Flament, John Cannon, Michael G. Tetley, Simon E. Williams, Xianzhi Cao, Omer F. Bodur, Sabin Zahirovic, Andrew Merdith
Summary: We present a tectonic-rules-based optimization approach to construct a plate motion model in a mantle reference frame covering the last billion years and use it as a constraint for mantle flow models. Our model results in net lithospheric rotation consistently below 0.25 degrees Myr(-1), in agreement with mantle flow models, while trench motions are confined to a relatively narrow range of -2 to +2 cm yr(-1) since 320 Ma, during Pangea stability and dispersal.
Correction
Multidisciplinary Sciences
Nicolas Flament, Omer F. Bodur, Simon E. Williams, Andrew S. Merdith
