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Asymmetry of Cyclonic Sea Surface Wind and Wave Observed by SAR 由SAR观测到的气旋性海面风波的不对称性
IF 4.6 1区 地球科学
Geophysical Research Letters Pub Date : 2025-09-05 DOI: 10.1029/2025GL116600
Weizeng Shao, Yuyi Hu, Qingping Zou, Maurizio Migliaccio, Xingwei Jiang
{"title":"Asymmetry of Cyclonic Sea Surface Wind and Wave Observed by SAR","authors":"Weizeng Shao,&nbsp;Yuyi Hu,&nbsp;Qingping Zou,&nbsp;Maurizio Migliaccio,&nbsp;Xingwei Jiang","doi":"10.1029/2025GL116600","DOIUrl":"https://doi.org/10.1029/2025GL116600","url":null,"abstract":"<p>CyclObs-derived wind and SWH field are extracted from over 600 dual-polarized Sentinel-1 (S-1) images of around 300 tropical cyclones (TCs) over the past eight years to investigate asymmetry of wind and wave fields during TCs. Fetch analysis and machine learning technique, eXtreme Gradient Boosting (XGBoost), is used to establish a relationship between TC wind speed and significant wave height (SWH). It was found that TC wind and SWH radii become asymmetric as sea states intensify. Notably, wind radii correlations (CORs) increase on the left-right and left-back quadrants for wind speeds larger than 20 m/s, while SWH radii exhibit the opposite trend. XGBoost is employed to obtain the improved relationship between wind fetch and SWH (COR &lt; 0.17). Validation against buoys and Haiyang-2 (HY-2) observations of 20 TCs indicates that the root mean squared error in SWH predictions is reduced by up to 1.1 m using XGBoost instead of empirical model. The new TC wave model by XGBoost is particularly robust under high-wind conditions, therefore vital for warning and mitigation of extreme storms and improved parameterizations of air-sea interaction.</p>","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 17","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL116600","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144998896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Distinct Global Distribution of Electrostatic Electron Cyclotron Harmonic Waves in Earth's Magnetosphere Revealed by Multi-Satellite Observations 多卫星观测揭示的地球磁层静电电子回旋谐波的独特全球分布
IF 4.6 1区 地球科学
Geophysical Research Letters Pub Date : 2025-09-05 DOI: 10.1029/2025GL117276
Yuequn Lou, Binbin Ni, Xing Cao, Qianli Ma, Yoshizumi Miyoshi, Dedong Wang, Shuqin Chen, Jiaming Li, Xudong Gu, Xin Ma, Qi Zhu, Yoshiya Kasahara, Shoya Matsuda, Atsuki Shinbori, Ayako Matsuoka, Mariko Teramoto, Kazuhiro Yamamoto, Iku Shinohara
{"title":"Distinct Global Distribution of Electrostatic Electron Cyclotron Harmonic Waves in Earth's Magnetosphere Revealed by Multi-Satellite Observations","authors":"Yuequn Lou,&nbsp;Binbin Ni,&nbsp;Xing Cao,&nbsp;Qianli Ma,&nbsp;Yoshizumi Miyoshi,&nbsp;Dedong Wang,&nbsp;Shuqin Chen,&nbsp;Jiaming Li,&nbsp;Xudong Gu,&nbsp;Xin Ma,&nbsp;Qi Zhu,&nbsp;Yoshiya Kasahara,&nbsp;Shoya Matsuda,&nbsp;Atsuki Shinbori,&nbsp;Ayako Matsuoka,&nbsp;Mariko Teramoto,&nbsp;Kazuhiro Yamamoto,&nbsp;Iku Shinohara","doi":"10.1029/2025GL117276","DOIUrl":"https://doi.org/10.1029/2025GL117276","url":null,"abstract":"<p>Electrostatic electron cyclotron harmonic (ECH) waves have been analyzed using different satellite data. However, single-mission studies prevent a systematic understanding of the emissions in Earth's magnetosphere. We perform a comprehensive survey of ECH waves using observations from Van Allen Probes, Arase, and MMS satellites spanning over 2012–2023. Our results indicate that these waves cover a broad spatial region of <i>L</i> = 3–15, |MLAT| &lt; ∼40°, and nearly all magnetic local time sectors, showing a pronounced regional dependence. In the inner magnetosphere (<i>L</i> &lt; ∼6), ECH wave power peaks in the premidnight-to-noon sectors, while the waves in outer regions (<i>L</i> &gt; 6) exhibit dayside-maximized occurrence rates. Wave amplitudes are strongest on the nightside but display a secondary pre-noon peak at <i>L</i> &gt; 8. In addition, ECH waves are predominantly confined near the equator (|MLAT| &lt; 5°) at <i>L</i> &lt; ∼8, in contrast to the much broader latitudinal distribution (|MLAT| &lt; 35°) at higher <i>L</i>.</p>","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 17","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL117276","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144998897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
U–Pb zircon geochronology and geochemistry of Um Genud layered mafic intrusion in the northern tip of the Arabian-nubian shield: implications for the genesis of the plutonic crust of neoproterozoic immature intra-oceanic arc 阿拉伯-努比亚盾北端Um Genud层状基性侵入体的U-Pb锆石年代学和地球化学:对新元古代未成熟洋内弧深部地壳成因的启示
IF 3.2 2区 地球科学
Precambrian Research Pub Date : 2025-09-05 DOI: 10.1016/j.precamres.2025.107915
Tarek H. Abu El-Kheir , Keda Cai , Ayman E. Maurice , Kai Wang , Hairuo Wang , Maher Dawoud
{"title":"U–Pb zircon geochronology and geochemistry of Um Genud layered mafic intrusion in the northern tip of the Arabian-nubian shield: implications for the genesis of the plutonic crust of neoproterozoic immature intra-oceanic arc","authors":"Tarek H. Abu El-Kheir ,&nbsp;Keda Cai ,&nbsp;Ayman E. Maurice ,&nbsp;Kai Wang ,&nbsp;Hairuo Wang ,&nbsp;Maher Dawoud","doi":"10.1016/j.precamres.2025.107915","DOIUrl":"10.1016/j.precamres.2025.107915","url":null,"abstract":"<div><div>The Um Genud Neoproterozoic layered mafic intrusion, located in the South Eastern Desert of Egypt, represents the northwestern tip of the juvenile crust of the Arabian-Nubian Shield (ANS). This intrusion is composed of olivine gabbro, gabbro, noritic-gabbro and hornblende gabbro. Zircon U–Pb data constrain the emplacement age of the intrusion to 718 Ma, coinciding with the island arc stages of the ANS. The trace element patterns of pyroxenes, amphiboles, whole-rock samples and calculated melts in equilibrium with clinopyroxene and amphibole show marked Nb-Ta and Zr-Hf troughs and prominent peak of Pb. These features, along with the trace element abundances and ratios in zircon, suggest that the parental magma was generated in an intra-oceanic island arc setting from a depleted mantle source metasomatized by subducted slab-derived aqueous fluids. Textural features, mineral compositions of olivine, pyroxene and plagioclase, whole-rock geochemical characteristics, the calculated ƒO<sub>2</sub> values (FMQ + 1 – FMQ + 1.6), and the estimated water content (5.9 – 9.1 wt%) of melt indicate that the Um Genud gabbroic rocks represent cumulates differentiated from oxidized hydrous low-K tholeiitic magma, essentially by fractional crystallization. The estimated pressure of crystallization (∼3 to ∼ 3.5 kbar; ∼10 km depth), the low-K tholeiitic nature of parental magma and the relative abundance of the exposed gabbroic and granitic arc rocks in the study area are consistent with intrusion emplacement within the lower crust of an immature oceanic arc. This implies that even arcs with thin crust can develop considerable plutonic layers and contribute to continental crust growth through vertical accretion.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"429 ","pages":"Article 107915"},"PeriodicalIF":3.2,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144997686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Effect of Near-Surface Winds on Surface Temperature and Dust Transport on Venus 近地面风对金星表面温度和尘埃输送的影响
IF 4 1区 地球科学
Journal of Geophysical Research: Planets Pub Date : 2025-09-05 DOI: 10.1029/2025JE009133
Maxence Lefèvre, Sébastien Lebonnois, Aymeric Spiga, François Forget
{"title":"The Effect of Near-Surface Winds on Surface Temperature and Dust Transport on Venus","authors":"Maxence Lefèvre,&nbsp;Sébastien Lebonnois,&nbsp;Aymeric Spiga,&nbsp;François Forget","doi":"10.1029/2025JE009133","DOIUrl":"https://doi.org/10.1029/2025JE009133","url":null,"abstract":"<p>The knowledge of the Venus near-surface atmosphere is sparse. Few spacecrafts landed on the surface and measured winds with amplitudes below 1 m/s. The diurnal cycle of the wind amplitude and orientation is not known. Recent numerical simulations showed that slope winds along topographic structures could strongly impact the direction of winds. This study presents the first mesoscale modeling of such winds on Venus. A change of direction is occurring during the day in the main slopes, with upslope winds at noon due to solar heating and downslope winds at night. This is due to efficient IR cooling of the surface during the night, being colder than its surroundings slope atmospheric environment and leading to displacement of air. The temperature is impacted by the adiabatic cooling/warming induced by those winds. A strong heating effect is occurring for the downslope winds, leading to an anti-correlation between the surface temperature diurnal amplitude and the topography. This diurnal amplitude reaches 4 K in the plains and below 1 K in the mountains. The saltation of sediment by those winds was also quantified, with a higher probability at night along the slopes on the western flanks.</p>","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"130 9","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025JE009133","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144998635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Data Science and Machine Learning in Geo-Electromagnetics: A Review 地电磁学中的数据科学与机器学习综述
IF 4.6 2区 地球科学
Surveys in Geophysics Pub Date : 2025-09-05 DOI: 10.1007/s10712-025-09904-9
Qinghua Huang, Sihong Wu, Jiyan Xue
{"title":"Data Science and Machine Learning in Geo-Electromagnetics: A Review","authors":"Qinghua Huang, Sihong Wu, Jiyan Xue","doi":"10.1007/s10712-025-09904-9","DOIUrl":"https://doi.org/10.1007/s10712-025-09904-9","url":null,"abstract":"<p>Over the past two decades, data science and machine learning (ML) techniques have attracted increasing attention within the electromagnetic (EM) community, opening up significant potential for applications while also presenting challenges. This review provides a comprehensive survey of the advancements ML has contributed to the EM field, exploring existing challenges and future development trends. We begin by introducing basic concepts and recent advances in ML, ranging from unsupervised learning algorithms such as clustering methods, to advanced neural networks, physics-guided and generative models. Then, practical applications are thoroughly investigated across a variety of EM techniques, including magnetotellurics (MT), transient EM (TEM), airborne EM (AEM), electrical resistivity tomography (ERT), ground penetrating radar (GPR), among others. For each technique, we offer a detailed review of ML applications through various data analysis processes, including denoising, signal detection, forward simulation, inversion, and joint interpretation with other geophysical data. Furthermore, we discuss extensive applications of ML in fields such as understanding Earth’s deep structure, mineral exploration, groundwater management and hazard monitoring. We also address the ongoing challenges, including model generalization, comparability and interpretability. Looking forward, we highlight emerging trends like the advancement of uncertainty evaluation, the development of physics-guided and generative models, enhancements in data management and accessibility and the integration of cloud computing technologies. This comprehensive overview aims to establish a clear scope for current achievements and future potential of integrating ML with EM, thus laying a foundation for continued research and practical applications within the EM community.</p>","PeriodicalId":49458,"journal":{"name":"Surveys in Geophysics","volume":"29 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145003470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A review of Australian carbonatites and associated REE-Nb mineralisation 澳大利亚碳酸盐岩及其伴生REE-Nb矿化研究综述
IF 3.3 2区 地球科学
Journal of Geochemical Exploration Pub Date : 2025-09-05 DOI: 10.1016/j.gexplo.2025.107870
Ross Chandler , Ignacio González-Álverez , John Mavrogenes , Luke Blais
{"title":"A review of Australian carbonatites and associated REE-Nb mineralisation","authors":"Ross Chandler ,&nbsp;Ignacio González-Álverez ,&nbsp;John Mavrogenes ,&nbsp;Luke Blais","doi":"10.1016/j.gexplo.2025.107870","DOIUrl":"10.1016/j.gexplo.2025.107870","url":null,"abstract":"<div><div>Australia has 16 known carbonatites, and two other occurrences of REE mineralisation interpreted as carbonatite-related. These are all located within Precambrian crust, and host known resources of c. 7.2 Mt. of rare earth oxides (containing c. 1.73 Mt. of Nd<sub>2</sub>O<sub>3</sub> and Pr<sub>6</sub>O<sub>11</sub>), and c. 2.7 Mt. of Nb<sub>2</sub>O<sub>5</sub>.</div><div>Australia's carbonatites range from Neoarchean to Jurassic, and display extreme diversity in geological characteristics, ranging from large, multiphase intrusive complexes dominated by either carbonatite (e.g. Gifford Creek and Mt. Weld, Western Australia) or silicate rocks (e.g. Cummins Range and Cundeelee, Western Australia), to single phase and small volume carbonatite dykes (e.g. Yungal dykes, Western Australia). Studied occurrences show similarly diverse radiogenic isotopic signatures (Rb/Sr and Sm/Nd), indicating derivation from a variety of mantle sources ranging from HIMU through to EM1.</div><div>Significant rare earth element (REE) and niobium (Nb) mineralisation occurs in both fresh and weathered carbonatites throughout Australia, with markedly different mineralogical and grade characteristics. While weathering history and preservation are crucial to the formation of supergene enrichments in REE and Nb, analysis of whole-rock geochemical data for different carbonatite types from the Mt. Weld and Gifford Creek complexes suggest primary magmatic composition plays the strongest determinant in the magnitude of grade increase, with siderite-dominated carbonatites having less potential for supergene upgrade than dolomite, ankerite and calcite-dominated examples.</div><div>The distinct geophysical signatures of Australia's known carbonatites have aided exploration efforts leading to early discoveries of deposits within highly magnetic complexes such as Mt. Weld and Cummins Range. Recent discoveries of geophysically subtle complexes (e.g. Gifford Creek complex, West Arunta) suggests both alternative geophysical techniques and a comprehensive structural understanding are crucial to discovery.</div><div>Explorers should focus on areas of known carbonatite magmatism, with a particular focus on developing an understanding of the regional structures that can facilitate carbonatite intrusion. On a local scale, the selection of relevant carbonatite geophysical and exploration signatures leveraging previous local discoveries should be prioritised. The small number of known carbonatites in Australia compared to the other continents abundances indicates further carbonatites and associated mineralisation may be discovered with increased exploration.</div></div>","PeriodicalId":16336,"journal":{"name":"Journal of Geochemical Exploration","volume":"279 ","pages":"Article 107870"},"PeriodicalIF":3.3,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144996910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Increasing Accumulated Temperature Pushed the Maize Planting Limit Northwards: Phenomenon Analysis and Coping Strategy 积温升高将玉米种植极限向北推:现象分析及应对策略
IF 8.2 1区 地球科学
Earths Future Pub Date : 2025-09-05 DOI: 10.1029/2025EF005937
Yihang Huang, Zhengjia Liu
{"title":"Increasing Accumulated Temperature Pushed the Maize Planting Limit Northwards: Phenomenon Analysis and Coping Strategy","authors":"Yihang Huang,&nbsp;Zhengjia Liu","doi":"10.1029/2025EF005937","DOIUrl":"https://doi.org/10.1029/2025EF005937","url":null,"abstract":"<p>Climate warming is driving the northward movement of crop planting limits, especially for maize in Northeast China. While previous studies focused on dynamics of the potential northern limit of maize (PNLine), the movement of the actual northern limit of maize (ANLine) and its agricultural impacts remain underexplored. To bridge the gap, this study first developed a method to detect the ANLine using satellite-derived crop data and kernel density estimation. To assess the driving factors behind the expansion of maize acreage, an empirical analysis was conducted in the maize-soybean key competitive region (KCR). Finally, we calculated the climate-warming driven maize acreage expansion over the past two decades and projected its changes for the next decade. Results showed that the PNLine and ANLine moved northwards by an average of 101.67 and 75.4 km from 2000 to 2020. The two lines showed a strong correlation (<i>r</i> = 0.78, <i>p</i> &lt; 0.05). The increasing accumulated temperature was the key driver behind these movements. A 10°C·d increase in AAT10 is associated with a 3.12% increase in maize acreage in the KCR. From 2001 to 2020, ∼49.5% (2.83 × 10<sup>6</sup> ha) of the maize acreage expansion could be attributable to climate warming. By 2030, climate warming is projected to expand the maize acreage by 2.43, 2.66, and 3.19 × 10<sup>6</sup> ha under the SSP1-2.6, SSP2-4.5, and SSP5-8.5 scenarios. These findings highlight the need for strategies to narrow the profit gap between maize and soybean, offering insights for regional crop planting structure adjustments and agricultural sustainability under climate change.</p>","PeriodicalId":48748,"journal":{"name":"Earths Future","volume":"13 9","pages":""},"PeriodicalIF":8.2,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2025EF005937","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144998892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hf-Nd-Sr Isotopic Constraints on the Sources of Pelagic Clays and Silicate Residues of Ferromanganese Crusts in the Central Indian Basin 中印度盆地中锰铁结壳中上层粘土和硅酸盐残留物Hf-Nd-Sr同位素来源约束
IF 3.4 2区 地球科学
Journal of Geophysical Research-Oceans Pub Date : 2025-09-05 DOI: 10.1029/2025JC022607
N. P. Sukumaran, G. Parthiban, V. K. Banakar, B. Nagender Nath
{"title":"Hf-Nd-Sr Isotopic Constraints on the Sources of Pelagic Clays and Silicate Residues of Ferromanganese Crusts in the Central Indian Basin","authors":"N. P. Sukumaran,&nbsp;G. Parthiban,&nbsp;V. K. Banakar,&nbsp;B. Nagender Nath","doi":"10.1029/2025JC022607","DOIUrl":"https://doi.org/10.1029/2025JC022607","url":null,"abstract":"<p>The sources of pelagic clays and the silicate residues of ferromanganese (Fe-Mn) crusts from the Central Indian Basin remain unclear. Here, we present combined Hf-Nd-Sr isotopic compositions for a suite of clays and silicate residues of Fe-Mn crusts from the Afanasiy-Nikitin Seamount (ANS) to constrain their sources and the process influencing their variability. Our results show large and systematic variations with a range of 0.70788–0.73051 for <sup>87</sup>Sr/<sup>86</sup>Sr, from −15.68 to −7.55 for εNd, and from −3.9 to 6.72 for εHf. Detrital clays are characterized by radiogenic <sup>87</sup>Sr/<sup>86</sup>Sr, unradiogenic εNd, and εHf. Siliceous clays have less radiogenic <sup>87</sup>Sr/<sup>86</sup>Sr, radiogenic εNd, and εHf. The silicate residues of ANS Fe-Mn crusts have unradiogenic <sup>87</sup>Sr/<sup>86</sup>Sr, radiogenic εNd, and highly radiogenic εHf. Despite variable lithologies and depositional environments, all data display highly correlating trends in Nd-Sr and Nd-Hf space suggesting mixing of two common enriched and depleted end-members. Mixing relationships in Nd-Sr space define the sources as the Himalayas and the Indonesian Volcanic Arc (IVA). In the Nd-Hf space, the highly radiogenic Hf isotopic compositions of our sedimentary archives resolve the IVA source, but not the Himalayas that are plagued by zircon effects. Calculated ∆εHf clay ranges from 2.3 to 8.53 suggesting an unlikely presence of zircons in these sedimentary archives. Our results demonstrate that the clays and the silicate residues of ANS Fe-Mn crusts primarily originate from the Himalayas and the IVA, with the Himalayas supplying 47%–98% of the detrital clays and the IVA contributing 46%–62% to the siliceous clays and silicate residues of crusts.</p>","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"130 9","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144998862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Kilometer-scale hook-shaped Type2/Type3 folds due to refolding and transpressional strike-slip reversal in the Egyptian Nubian Shield, east African orogenic belt 东非造山带埃及-努比亚盾逆转走滑作用下的千米尺度钩状2/ 3型褶皱
IF 3.2 2区 地球科学
Precambrian Research Pub Date : 2025-09-05 DOI: 10.1016/j.precamres.2025.107912
Mohamed A. Abd El‑Wahed , Ahmed M. Eldosouky , Osama M.K. Kassem , Ahmed Abdelhady Abo-Rayan , Mohamed Attia
{"title":"Kilometer-scale hook-shaped Type2/Type3 folds due to refolding and transpressional strike-slip reversal in the Egyptian Nubian Shield, east African orogenic belt","authors":"Mohamed A. Abd El‑Wahed ,&nbsp;Ahmed M. Eldosouky ,&nbsp;Osama M.K. Kassem ,&nbsp;Ahmed Abdelhady Abo-Rayan ,&nbsp;Mohamed Attia","doi":"10.1016/j.precamres.2025.107912","DOIUrl":"10.1016/j.precamres.2025.107912","url":null,"abstract":"<div><div>This study combines remote sensing, aeromagnetic data, and field investigations to provide the initial identification of hook-shaped Type 2/Type 3 folds within the Egyptian Nubian Shield. The Western Allaqi shear belt (WASB) exhibits remarkable refolded structures that are distinctly observable from space. This belt primarily comprises ophiolite slices, metavolcanics, and volcanoclastic metasediments, which have been intruded by syn- (729–635 Ma) and post-tectonic granites (610–543 Ma). The WASB region experienced significant compression during the N-S shortening (830–720 Ma), leading to the formation of east–west oriented folds and foliation and N-dipping thrust imbrications. The interference patterns of the folds predominantly display Type 2 and Type 3 refolds characterized by wavelengths on the order of kilometers. The geological observation reveals a complex history of deformation, with refolded folds linked to dextral shear zones, ductile and brittle fabrics, and opposing movement directions. The fold interference structures were formed through the reactivation of NW-trending sinistral strike-slip shear zones, combined with shear-related folding of the initial F<sub>1</sub> folds, and NE-SE compression (625–565 Ma). The subsequent development of NW-trending Haseierbah folds (F<sub>2</sub>) was accompanied by a shift in stress orientation from NE-SW to E-W (620–580), resulting in a reversal of shear sense and the reactivation of NW-trending shear zones into dextral strike-slip shear zones, which in turn formed the N-trending El-Quleib fold (F<sub>3</sub>) and the NE-trending Haimur and Shilman folds (F<sub>4</sub>). This reversal in shear sense contributes to the formation of Type 2 and Type 3 fold interference patterns and the distinctive hook-shaped fold structures observed within the WASB. This study provides a detailed description of refolding and transpressional strike-slip reversal in the WASB, highlighting the innovative tectonic evolution and urging a reassessment of the entire Allaqi-Heinai suture and the major shear zones in the Egyptian Nubian Shield.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"429 ","pages":"Article 107912"},"PeriodicalIF":3.2,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145005224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
WITHDRAWAL: Provenance Study of Marble Artifacts From the Berenike (Egypt) Archaeological Site Based on Petrographic and Isotopic Data 撤回:基于岩石学和同位素数据的埃及Berenike考古遗址大理石器物来源研究
IF 1.4 3区 地球科学
Geoarchaeology-An International Journal Pub Date : 2025-09-05 DOI: 10.1002/gea.70028
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