Article
Materials Science, Multidisciplinary
Qihao Lv, Cheng Jin, Binchao Zhang, Liyuan Yin, Shuo Liu, Buning Tian, Tie Jun Cui
Summary: This study presents a new approach for the design of ultrawide-angle transparent surfaces by tuning electric and magnetic resonators, achieving an ultrawide-angle ultralow-reflection phenomenon.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Geosciences, Multidisciplinary
J. C. Meza-Cala, F. Tsikalas, J. Faleide, M. M. Abdelmalak
Summary: The study of the late Mesozoic-Cenozoic tectono-stratigraphic evolution of the northern Lofoten-Vesteralen margin offshore northern Norway was conducted using a combination of 2D multi-channel seismic profiles, 3D seismic survey, and potential field and well data. The analysis revealed distinct along-margin basin segmentation, with five main rift phases and eight mapped fault families identified, as well as compressional deformation features related to volcanic build-up and doming of Cenozoic successions. The study highlighted the essential nature of the northern Lofoten-Vesteralen margin in understanding the tectono-stratigraphic evolution of the NE Atlantic margins.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Jue Hou, Tao Xu, Qingtian Lu, Zhiming Bai, Yongqian Zhang, Zhiyu Zhang, Dan Yang
Summary: Through wide-angle seismic scanning, we have identified the characteristics and origins of large-scale mineralization in South China during the Mesozoic period. The Cu-Au metallogenic belt and the Qinhang Cu-polymetal metallogenic belt contain Cu-Au-rich mafic lower crust derived from the mantle, while the Jiangnan W-polymetal metallogenic belt contains ancient crust material enriched in W-Sn. The spatial distribution of these mineralization belts is controlled by the boundaries and discontinuities of the lithosphere.
SCIENCE CHINA-EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Xiaodong Wei, Weiwei Ding, Gail L. Christeson, Jiabiao Li, Aiguo Ruan, Xiongwei Niu, Jie Zhang, Yifeng Zhang, Pingchun Tan, Zhaocai Wu, Aoxing Wang, Hanghang Ding
Summary: By studying the crustal structure of the East China Sea, the research has revealed the position of Mesozoic collision and the potential location of the suture zone. The findings show significant variations in crustal structure both vertically and horizontally, indicating geological differences between the Zhemin Volcanic Belt and the Continental Shelf Basin.
Article
Geochemistry & Geophysics
Alexander Y. Rozhko
Summary: Researchers argue that low-frequency shadows are not simply attenuation phenomena, but rather the result of energy being added or amplified by certain physical or numerical processes. The hysteresis of liquid bridges inside cracks leads to nonlinear energy exchange between frequencies, explaining the boost in wave energy at lower frequencies.
Article
Geosciences, Multidisciplinary
Laxmidhar Behera, Renuka Kolluru, Bijendra Singh
Summary: The study successfully imaged sub-basalt Mesozoic sediments in the Deccan Volcanic Province of India using seismic reflection techniques and other geophysical methods, providing valuable insights for hydrocarbon exploration.
JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA
(2021)
Article
Geosciences, Multidisciplinary
Xiaofeng Tian, Walter D. Mooney, Xiaoguo Deng, Songlin Li, Baofeng Liu, Hanqi Liu
Summary: This study presents crustal models for seismic P-waves and S-waves across the southern North China Craton, showing a strong correspondence between surface geology, local tectonics, and the deep crustal structure.
JOURNAL OF EARTH SCIENCE
(2022)
Article
Geochemistry & Geophysics
Jiyan Lin, Tao Xu, Huiteng Cai, Qingtian Lu, Zhiming Bai, Yangfan Deng, Yongqian Zhang, Minfu Huang, Jose Badal, Xing Jin
Summary: The study revealed significant crustal thinning beneath the Yangtze and Cathaysia Blocks, with the Shaoxing-Jiangshan-Pingxiang Fault and Zhenghe-Dapu Fault identified as tectonic boundaries. A low P-wave velocity layer was found beneath the Wuyishan Metallogenic Belt, and there was a clear lateral velocity variation in the middle-lower crust in Cathaysia.
Article
Geosciences, Multidisciplinary
Qiang Wang, Minghui Zhao, Jiazheng Zhang, Haoyu Zhang, Jean-Claude Sibuet, Zizheng Li, Enyuan He, Xuelin Qiu, Wen Peng, Guizhong Chen
Summary: In order to improve constraints on the breakup processes and seafloor spreading in the northern margin of the South China Sea, we collected deep-penetration wide-angle seismic data. The results show thinning crust in the continental domain and relatively constant crust thickness in the oceanic domain. The continent-ocean boundary is characterized by abrupt changes in crustal thickness and distinct gravity and magnetic anomalies.
Article
Geosciences, Multidisciplinary
Jianghao Qi, Xunhua Zhang, Zhiqiang Wu, Xiangjun Meng, Luning Shang, Yang Li, Xingwei Guo, Fanghui Hou, Enyuan He, Qiang Wang
Summary: The study revealed important insights into the unique tectonic features of the Western Pacific Ocean, particularly in the southern Okinawa Trough, where a high-velocity zone in the lower crust indicates mantle material upwelling and accretion. The presence of discontinuous high-velocity zones in the lower crust also suggests a migration of spreading centers in the back-arc region since the Cenozoic era, driven by ongoing asthenosphere upwelling and lithosphere eastward extension.
GEOSCIENCE FRONTIERS
(2021)
Article
Geochemistry & Geophysics
Imma Palomeras, Siddique A. Ehsan, David J. Martinez Poyatos, Puy Ayarza, David Marti, Ramon Carbonell, Antonio Azor, Luis M. Parra, Ignacio Marzan
Summary: The nature of the crust beneath central Iberia was estimated using wide-angle seismic reflection/refraction transect, revealing regional variations in the composition of the upper and lower crust. The upper crust is mainly composed of low-grade metasedimentary rocks in the southern and central segments, while the northern segment is dominated by igneous rocks. A sharp boundary between the two crustal layers is observed between 12 km (south) and 18 km (north) depth, with the lower crust showing low Poisson's ratios suggesting a felsic composition. Interactions with mafic components are suggested by lamination observed in the data.
Article
Mechanics
G. Emanuel, S. Molder
Summary: The curved shock theory is developed to study the flow characteristics on the downstream side of a three-dimensional shock surface. It provides a comprehensive analysis of non-symmetric, stationary, blunt-body shocks in a uniform, steady, supersonic freestream. The theory presents the flow-plane-associated derivatives, including pressure, density, velocity components, vorticity, and shock curvatures. It also provides relations for various parameters such as shock angles, flow deflection angles, intrinsic coordinates, pressure derivatives, streamline curvatures, and the reflection coefficient. The article utilizes scatterplots to globally analyze and locate important curves related to sonic flow, maximum flow deflection angle, maximum vorticity, zero streamline curvature, and zero streamwise pressure gradient on the back of a three-dimensional shock wave surface.
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)