Article
Geology
Hyun Na Kim, Byung-Dal So, Min Sik Kim, Kee Sung Han, Sol Bi Oh
Summary: This study reveals the essential role of dolomite decarbonation in weakening carbonate faults, as well as the influence of low crystalline ultrafine fault gouge on decarbonation and slip behavior. Experimental results show a significant contribution of mechanical decarbonation at low temperatures, and a decrease in the onset temperature of thermal decarbonation.
Article
Geochemistry & Geophysics
Xiuli Yan, Bo Zhang, Guodong Wang, Tao Yang, Jianye Chen
Summary: This study investigates fault rocks and protoliths from the Shaba outcrop (Beichuan County) on the Yingxiu-Beichuan Fault ruptured during the 2008 Wenchuan Mw 7.9 earthquake using rock magnetic measurements and electron microscopic observations. The results show that pyrrhotite, a product of pyrite alteration at high temperatures, is present in fault gouges, indicating frictional heating during earthquake slip. Additionally, the presence of goethite suggests the presence of hot fluids within the fault zone. These findings suggest that thermal pressurization may be a plausible mechanism of coseismic fault weakening during the Wenchuan earthquake.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Engineering, Mechanical
Xianghua Meng, Jing Wang, Hiroshi Nishikawa, Gyoko Nagayama
Summary: This study investigated the effects of both velocity slip and thermal slip on film thickness in EHL contact, finding that velocity slip reduces film thickness under pure rolling contact, while both slips result in a shifted surface dimple under zero entrainment velocity (ZEV) contact.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Chemical
Y. Zhao, P. L. Wong
Summary: Recent research has found a new lubrication scheme brought by boundary slip effect in lubrication. However, achieving a durable slip coating in elastohydrodynamic lubrication (EHL) is challenging. One possible solution is to apply a slip surface coating onto a substrate with an interlayer, creating a multi-layer structure. This study presents a robust framework for analyzing the effects of coating and interlayer thickness and strength, and develops a general algorithm for investigating the mechanics of boundary slip EHL contact.
Article
Geochemistry & Geophysics
Shiying Nie, Sylvain Barbot
Summary: This study examines the dynamics of fault behavior in the parametric space of frictional conditions, showing that seismogenic slow-slip events are natural for homogeneous faults under near velocity-neutral conditions. The presence of material heterogeneity may explain the spatio-temporal clustering and migration features of tremor activity.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Engineering, Multidisciplinary
Eric C. Bryant, WaiChing Sun
Summary: This study utilizes a phase field framework to investigate the frictional slip of strong discontinuities in geological formations of different length scales, proposing a regularized constitutive law adjusted based on loading rates and temperature ranges. Numerical examples demonstrate that this model can capture the frictional response along complex interfaces.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Multidisciplinary Sciences
V Rubino, N. Lapusta, A. J. Rosakis
Summary: Lab experiments show that dynamic ruptures propagate through fault regions with fine rock gouge through complex and intermittent slip processes. These processes include repeated arrest of rupture propagation caused by friction strengthening at lower slip rates, and dynamic earthquake re-nucleation enabled by pronounced rapid friction weakening at higher slip rates.
Article
Geochemistry & Geophysics
Xiaofeng Chen, Sai Sandeep Chitta, Ximeng Zu, Ze'ev Reches
Summary: This study investigates the weakening processes of faults during earthquakes, emphasizing that the weakening at the rupture-front is more efficient than frictional weakening. Experimental results show that the rupture-front can rapidly weaken the entire fault, possibly occurring in natural faults as well.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Engineering, Mechanical
Y. Zhao, P. L. Wong
Summary: The study demonstrates that shear heating can significantly weaken lubrication in elastohydrodynamic lubricated contacts under high slide-to-roll ratios, but under certain circumstances, it may contribute to the bearing load-carrying capacity.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Electrical & Electronic
Gwanghee Hong, Kyobong Kim, Youngjun Park, Gunhee Jang
Summary: This paper proposes a numerical method to investigate the frictional characteristics of a fluid film journal bearing considering the elastohydrodynamic lubrication and the asperity contact force. The method is verified by comparing the calculated friction coefficient with experimental data, and it is applied to study the frictional characteristics of a scroll compressor journal bearing under dynamic loads.
Article
Geosciences, Multidisciplinary
Jonathan Simpson, Kasper Wijk, Ludmila Adam
Summary: Laser ultrasonic measurements revealed a spatial dependence of dynamic nonlinear weakening in rocks from the Alpine Fault in New Zealand, with cataclasites within the damage zone showing significant reduction in shear modulus and increased nonlinear elasticity. The study suggests that rock weakening is strongest near the surface and may play a crucial role in earthquake processes such as fault weakening, triggering of slip, rupture propagation, and coseismic velocity decreases.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Engineering, Chemical
Junqin Shi, Junyi Wang, Xiaobin Yi, Xiaoli Fan
Summary: The study used nonequilibrium molecular dynamics simulations to investigate the slip and traction properties of a traction fluid under high-temperature and -pressure conditions. Different film thicknesses were found to correspond to various solid-like or liquid phases, with an inverse proportion relationship between slip length and traction coefficient.
Article
Multidisciplinary Sciences
Sangwoo Woo, Raehee Han, Kiyokazu Oohashi
Summary: Rapid slip during earthquakes can cause frictional melting in rocks, which has long been considered a disequilibrium process. We conducted experiments on different types of silicate rocks at a slip rate of 1.3 m/s and found that all minerals in the rocks melt at temperatures below their known melting temperatures. The low-temperature melting is caused by grain size reduction and phase boundary reactions during different stages of slip. These new findings and estimated melting temperatures are important for understanding the mechanics of earthquakes, landslides, and caldera collapses.
SCIENTIFIC REPORTS
(2023)
Article
Geochemistry & Geophysics
N. M. Beeler, Allan Rubin, Pathikrit Bhattacharya, Brian Kilgore, Terry Tullis
Summary: In rock friction experiments at large displacement, it is observed that the fracture energy and slip weakening distance increase with the square of the logarithm of hold duration. The increase in slip weakening distance is attributed to the development of a shear zone due to wear over significant displacements. These observations have direct relevance to earthquake nucleation and suggest a 'toughening' of natural faults during the interseismic period.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
F. Paglialunga, F. Passelegue, S. Latour, A. Gounon, M. Violay
Summary: Fluids in the Earth's crust affect the stability and dynamics of faults, and viscous fluids have been found to play a significant role in fault reactivation and earthquake ruptures. In experiments using analogue material, it was discovered that the presence of viscous lubricants along faults reduces frictional resistance, increases nucleation length, and decreases fracture energy. Furthermore, the higher the viscosity of the fluids, the greater the reduction in frictional strength and increase in nucleation length.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Jianye Chen, Martijn P. A. van den Ende, Andre R. Niemeijer
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Geochemistry & Geophysics
Qingbao Duan, Jianye Chen, Xiaosong Yang
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Geochemistry & Geophysics
Luuk B. Hunfeld, Jianye Chen, Sander Hol, Andre R. Niemeijer, Christopher J. Spiers
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Geochemistry & Geophysics
M. P. A. van den Ende, J. Chen, A. R. Niemeijer, J. -P. Ampuero
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Review
Geochemistry & Geophysics
Tao Yang, Yu-Min Chou, Eric C. Ferre, Mark J. Dekkers, Jianye Chen, En-Chao Yeh, Wataru Tanikawa
REVIEWS OF GEOPHYSICS
(2020)
Article
Geochemistry & Geophysics
Jianye Chen, B. A. Verberne, A. R. Niemeijer
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Geochemistry & Geophysics
Jianye Chen, A. R. Niemeijer, Christopher J. Spiers
Summary: The study extends the frictional behavior model of seismogenic ruptures on faults in carbonate terrains to cover a full spectrum of slip velocities, from low to high speeds, predicting a continuous transition in dominant deformation mechanisms. Based on realistic fault structure, measurable microstructural state variables, and established deformation mechanisms, the model may offer an improved basis for extrapolating lab-derived friction data to natural fault conditions.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geosciences, Multidisciplinary
Luuk B. Hunfeld, Jianye Chen, Andre R. Niemeijer, Shengli Ma, Christopher J. Spiers
Summary: Experimental research shows that rock materials exhibit dynamic weakening of 22%-81% under high velocities and large displacements, depending on normal stress and soil composition. This weakening may be achieved through thermal pressurization, and similar effects play a key role in induced seismic slip in reservoir systems like Groningen.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geochemistry & Geophysics
Li-Wei Kuo, Chien-Cheng Hung, Haibing Li, Stefano Aretusini, Jianye Chen, Giulio Di Toro, Elena Spagnuolo, Fabio Di Felice, Huan Wang, Jialiang Si, Hwo-Shuenn Sheu
Summary: The 2008 Wenchuan earthquake caused surface ruptures along the Longmenshan fault belt, with the Yingxiu-Beichuan fault and the Guanxian-Anxian faults being the most affected. Frictional experiments were conducted on the gouge materials from the Guanxian-Anxian faults, revealing that wet gouges have lower friction coefficients compared to those under room humidity conditions. Additionally, the gouges exhibited enhanced velocity-strengthening behavior at intermediate velocities, indicating a potential barrier to slip acceleration during fault propagation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Tao Yang, Mark J. Dekkers, Xixi Zhao, Katerina E. Petronotis, Yu-Min Chou
Summary: This study provides insights into a novel pathway of greigite formation controlled by turbidites and bioturbation. The research also suggests that early diagenetic greigite can preserve primary (quasi-)syn-sedimentary magnetic records.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Jianye Chen
Summary: In this study, the slip stability of a fluid-infiltrated fault is analyzed using a microphysical friction model. The results show the possibility of four different modes of slow slips without invoking inertia, suggesting that the microphysical model is favorable for generating slow slips.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Jianye Chen, Andre R. R. Niemeijer, Christopher J. J. Spiers
Summary: Insufficient physical knowledge of fault behavior hampers earthquake simulation and hazard prediction. Laboratory studies suggest that earthquake rupture on carbonate faults can be explained by a transition from high to low friction, known as rapid dynamic weakening. Frictional heating resulting in deformation by grain boundary sliding is one explanation for this weakening. In this study, a microphysically based model was used to simulate seismic slip in laboratory carbonate faults, taking into account grain size evolution and deformation mechanisms.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Jianye Chen, Luuk B. Hunfeld, Andre R. Niemeijer, Christopher J. Spiers
Summary: High-velocity friction experiments on simulated fault gouges sheared at high normal stress and to low displacement were performed, revealing the relationship between constitutive parameters and normal stress, providing important constraints for numerical modeling of induced rupture propagation. The experiments also found that different rock types in the Groningen field exhibit varying levels of resistance to rupture and proposed a micrometer-scale fault weakening mechanism.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Jinyu Chen, Jianye Chen, Lu Yao, Xi Ma
Summary: This study investigated the effects of shear deformation on the friction and electrical conductivity of synthetic quartz-graphite mixtures. The results showed that specimens with higher graphite content exhibited higher electrical conductivity. Mixtures with lower graphite content (as low as 3.4% by volume) may cause high conductivity anomalies in natural shear zones.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Review
Geosciences, Multidisciplinary
Fuquan Yang, Xinxia Geng, Zhixin Zhang, Guoren Liu, Hanqing Zhang
Summary: Northern Xinjiang in China is an important part of the Central Asian Orogenic Belt, characterized by multiple episodes and types of mineralization. Cu and Au deposits are mostly found in Altay, Junggar, and Tianshan, with minor occurrences in Beishan. The most common types of Cu-Au deposits are volcanogenic and porphyry deposits. The formation of Cu-Au deposits can be divided into five mineralization episodes, with the Devonian and Carboniferous being the main periods. These deposits developed in various tectonic settings, including island arc, continental arc, collision, and postcollisional extensional tectonics.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Jiang Zhu, Dan-yang Liu, Chao Chen, Song Chen, Yuan-bing Zou, Leonid Danyushevsky, Jing-meng Huang, Xiang-wei Tang
Summary: Numerous lode gold and silver deposits have been discovered in orogenic belts in China. This study focuses on the formation and fluid evolutions of the super-large Yingdongpo gold and giant Poshan silver deposits in the Tongbai-Dabie orogen. The results suggest that both deposits were formed concurrently with Early Cretaceous granitic magmatism and the ore-forming fluids were primarily of magmatic origin with meteoric water inputting. The gold mineralization is related to a change in the physicochemical properties of the fluids, while the silver mineralization is favored by progressive deposition of sulfides in a slowly cooling hydrothermal system.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Arun Bhadran, B. P. Duarah, Drishya Girishbai, Mohammad Atif Raza, Avi Mero, Sandeep Lahon, A. L. Achu, Girish Gopinath
Summary: The Brahmaputra foreland basin, known for its dynamic tectonism and sediment load, exhibits a variety of seismically generated soft sediment deformation structures (SSDS) such as clastic dikes, sand sills, and micro-faults. These structures, influenced by multiple strong seismic events, are characterized by their dimensions, intrusion angles, cross-cutting relations, wall shattering, and age. The study suggests that a significant earthquake with high intensity and magnitude might have caused liquefaction features in the area. The findings highlight the importance of studying SSDS in tectonically active regions with limited surface ruptures and dense alluvial cover.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Huan Wang, Lirong Dou, Xingyang Zhang, Jiquan Yin, Beiwei Luo, Haigang Duan, Peiguang Yang, Yifan Song
Summary: Quantitative analysis of sediment composition and microfacies helped identify changes in facies belts in the Cretaceous Mishrif Formation. The study demonstrated the importance of carbonate microfacies quantification and its implications for paleogeographic research.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Boran Wang, Zhilong Huang, Dongsheng Xiao, Haiyue Yu, Wenren Zeng, Xin Wang, Tong Qu, Zhiyuan Li, Yizhuo Yang
Summary: By systematically analyzing the source rocks of the Sangonghe Formation in the Taibei Sag, NW China, and using kerogen kinetics modeling, this study reveals the influence of geological conditions on hydrocarbon generation and expulsion. The source rocks in different environments show distinct geochemical characteristics and hydrocarbon generation potential.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Haiying Yang, Zhifang Zhao, Haifeng Fan, Min Zeng, Jiafei Xiao, Xiqiang Liu, Shengwei Wu, Jiangqin Chao, Yong Xia
Summary: This paper investigates the REE enrichment and the role of Fe/Mn (oxyhydr)oxides in marine phosphorites from the early Cambrian period in South China. The study reveals that Fe/Mn (oxyhydr)oxides play a crucial role in REE enrichment and are controlled by Fe-redox pumping.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Qing Li, Hongbin Wang, Feng Cai, Di Luo, Fanxing Kong, Ang Li, Xiting Liu
Summary: The elemental and isotopic compositions and abundance of carbonates in marine sediments are used to reconstruct ancient climate and ocean conditions. This study analyzed sediment samples from the Okinawa Trough to examine the relationship between carbonates' compositions and methane seepage and sea-level changes. The results indicate that both biogenic and authigenic carbonates are important factors in understanding paleoclimate and paleoceanography.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Maryam Akbarzadeh Aghdam, Abdolreza Ghods, Farhad Sobouti, Khalil Motaghi, Keith Priestley, Mohammad Enayat
Summary: The Makran subduction zone is difficult to monitor due to limited seismic activity, but a temporary seismic network was installed to investigate the relationship between different regions and detect seismicity. The observed seismicity suggests the presence of structural boundaries and seismically inactive areas.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Zhen-Yu Wang, Hong-Rui Fan, Hai-Dong She, Kui-Feng Yang
Summary: This study conducted detailed geochemical, geochronological and isotopic analyses on the Songxian syenite in the Qinling Orogen. The results revealed the magma sources, petrogenesis and geodynamic implications of this alkaline intrusion. The study suggests that the syenite was formed through multiple stages of magmatism, involving the partial melting of the enriched lithospheric mantle and mixing with melts derived from the lower crust.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Yu Li, Wen-Liang Xu, Xiao-Ming Zhang, Jie Tang
Summary: This study presents new zircon U-Pb-Hf and whole-rock geochemical data for Jurassic intrusive rocks in the Yanbian area of NE China, providing insights into the subduction history of the Paleo-Pacific Plate. The study reveals three stages of Jurassic magmatism in the area, indicating the presence of an active continental margin related to the initial subduction of the Paleo-Pacific Plate beneath the Eurasian continent.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Lina Ai, Shengfa Liu, Shuai Cong, Hui Zhang, Peng Cao, Kaikai Wu, Wenxing Ye, Che Abd Rahim Mohamed, Xuefa Shi
Summary: This study investigates the depositional configurations and sedimentary environments of the Malacca Strait through analyzing grain size characteristics and hydrographic data. The results show that residual sediments are concentrated in the central region, while modern terrigenous sediments are distributed along the coast of Malaysia and the northern region. The sedimentary environments are influenced by seasonal variations and hydrodynamic conditions.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Liang Xiao, Jia-qi Liang, Li-yan Guo, De-shuang Ji, Man Yuan, Xiang-chuan Li, Nan Sun, Zuo-chen Li
Summary: This study investigates the correlation between stable carbon isotopes of plant fossils and CO2 levels in the Jurassic period. The results suggest a weak correlation between the two, indicating caution is needed when using stable carbon isotopes to reconstruct high paleo-CO2 concentrations.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Xuli Yang, Feng Huang, Jifeng Xu, Xijun Liu, Liying Zhang, Zhao Zhang, Benyan Xu, Man Zhang, Yunchuan Zeng, Qian Liu, Mingda Lv
Summary: The extensively developed Early Cretaceous intermediate-felsic rocks in the northern North China Craton provide valuable insights into the nature of Paleo-Pacific subduction and associated geodynamic processes. Geochemical and geochronological analyses of trachyandesites and rhyolites from the eastern Hebei, northern NCC suggest that the trachyandesites likely originated from enriched mafic lower crust and the rhyolites are derived from the trachyandesitic magmas through fractional crystallization. The migration direction change of these rocks is believed to be primarily attributed to slab rollback of the subducting Paleo-Pacific Plate.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Wei Liu, Ping Gao, Xianming Xiao, Yanming Zhao, Yijie Xing, Jinku Li
Summary: The organic-rich shales of the Shuijingtuo Formation in China are an important target for shale gas exploration. The upper section of the formation, primarily consisting of limestone, silty shale, and black shale, has been rarely studied but recently showed promising results for shale gas exploration. Geochemical investigations of the upper section shale deposits revealed that the organic matter enrichment mechanism underwent dynamic changes due to relative sea-level changes and episodic upwelling activities.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Xin Wang, Chen Zhang, Zixin Xue, Qianyou Wang, Zhenxue Jiang, Kun Zhang, Xiangye Kong
Summary: This study analyzed the heterogeneity of gas compositions and the effects of magmatism on gas accumulation in shale gas exploration in the Yangtze plate. The results showed that magmatism caused the development of micro-fractures in shale reservoirs and accelerated the thermal evolution rate of organic matter. The impact of magmatism on shale gas accumulation varied in different regions, either favoring or compromising efficient gas accumulation in shale reservoirs.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)