Studia Geophysica et Geodaetica最新文献

{"title":"Possible Fingerprints of Low-intensity, Multiple Impacts in the Magnetic Fabric of some Carbonaceous Chondrites","authors":"Balázs Bradák,&nbsp;Yusuke Seto,&nbsp;Sena Toyonaga,&nbsp;Ákos Kereszturi,&nbsp;Martin Chadima","doi":"10.1007/s11200-026-00007-8","DOIUrl":"10.1007/s11200-026-00007-8","url":null,"abstract":"<div><p>The study of meteorites’ magnetic fabric may provide information on various stages of material evolution in the Solar System from accretion to planetesimal formation and so on. One of the key processes is collisions and (hypervelocity) impacts, supposedly resulting in the alteration of the petrofabric. Surprisingly, many of the carbonaceous chondrites are characterized by low shock-stage, in contrast to their magnetic fabric, which shows the influence of impacts. The study aimed to propose and test the hypothesis of nanoscale fragmentation as evidence for multiple low-intensity impacts, based on the characterization of the magnetic fabric. A pioneering application of a novel method on meteorites, the anisotropy of frequency-dependent magnetic susceptibility measurements may enable the identification of nanoscale mineral components and their orientation in meteorites, potentially indicating the presence of such processes. In addition, combined rock magnetic (including hysteresis, isothermal remanent magnetization, first-order reversal curve, and thermomagnetic experiments) and scanning electron microscopy were also conducted on three carbonaceous chondrites: Allende, Jbilet Winselwan, and Murchison. As the executed rock magnetic measurements revealed, FeNi alloys, iron sulphides (pyrrhotite), and magnetite were the main magnetic contributor minerals. The foliated magnetic fabric and the oblate susceptibility ellipsoid are likely the marks of asteroid impacts and collisions, even though the shock stage of the studied meteorites suggests unshocked or very weakly shocked petrofabric. Multiple, low-intensity impacts may explain such a paradox. Still, due to the lack of superparamagnetic contributors, no nano-scale superparamagnetic fabric could be recognized by the anisotropy of frequency-dependent magnetic susceptibility measurements. Along with the characterization of the magnetic fabric, our study provided essential information about the rock magnetic contributors of Jbilet Winselwan, whose magnetic characteristics have not yet been studied in detail.</p></div>","PeriodicalId":22001,"journal":{"name":"Studia Geophysica et Geodaetica","volume":"70 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148009063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prevailing-Frequency Approximation of the Coupling Ray Theory Within the Weak-Anisotropy Concept II-Numerical Tests","authors":"Ivan Pšenčík,&nbsp;Véronique Farra","doi":"10.1007/s11200-025-0913-5","DOIUrl":"10.1007/s11200-025-0913-5","url":null,"abstract":"<div><p>The formulae for the prevailing-frequency approximation of the coupling ray theory derived in the companion paper, are tested on several models displaying varying strength of anisotropy and containing various types of shear-wave singularities. Standard coupling ray theory applied to these models yields results of a high accuracy as follows from tests made in the past. Therefore, the results of the standard coupling ray theory are used as a benchmark in this study. The results of the tests show that the prevailing-frequency approximation of the coupling ray theory can serve as a perfect substitute of its standard counterpart. Use of the prevailing-frequency approximation simplifies and speeds up considerably the computational procedure and makes it comparable with the procedure for the calculation of separate waves in the ray-theory approximation.</p></div>","PeriodicalId":22001,"journal":{"name":"Studia Geophysica et Geodaetica","volume":"70 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11200-025-0913-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147938848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Origin of Anisotropy of Magnetic Susceptibility in Serpentinized Orogenic Peridotite","authors":"Vladimír Kusbach,&nbsp;Matěj Machek,&nbsp;Zuzana Roxerová,&nbsp;Karel Schulmann,&nbsp;Stanislav Ulrich,&nbsp;Martin Chadima","doi":"10.1007/s11200-025-1028-8","DOIUrl":"10.1007/s11200-025-1028-8","url":null,"abstract":"<div><p>Serpentinization significantly alters orogenic peridotites, but the processes controlling the magnetic fabric development remain incompletely understood, particularly the roles of mineralogy, fluid availability, and deformation. This study addresses this gap by combining petrography, rock magnetic measurements, and numerical modeling on samples representing moderate to complete serpentinization. Magnetic properties indicate a mix of paramagnetic serpentine and ferrimagnetic magnetite, with anisotropy of magnetic susceptibility fabrics showing spatial patterns linked to serpentinization degree and structural setting. Microstructural observations reveal that serpentine and magnetite grow parallel or at characteristic angles to primary fabrics, while deviations reflect post-serpentinization deformation. Numerical modeling confirms that magnetic fabric orientation depends on the interaction of primary mineral crystallographic preferred orientation and topotactic serpentinite growth. These results demonstrate the complex interplay of mineralogy, fluid-rock interaction, and deformation in controlling magnetic fabric evolution during serpentinization in orogenic peridotites.</p></div>","PeriodicalId":22001,"journal":{"name":"Studia Geophysica et Geodaetica","volume":"70 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11200-025-1028-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147938849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Publisher Correction to: Magnetic Signature of the Camarena de la Sierra Jurassic Magmatism in the SE Iberian Chain (Teruel, Spain)","authors":"Belén Oliva-Urcia,&nbsp;Antonio Casas-Sainz","doi":"10.1007/s11200-026-00023-8","DOIUrl":"10.1007/s11200-026-00023-8","url":null,"abstract":"","PeriodicalId":22001,"journal":{"name":"Studia Geophysica et Geodaetica","volume":"70 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11200-026-00023-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147938850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reply to Comments by J.E. Cortes on Magnetic signature of the Camarena de la Sierra Jurassic Magmatism in the SE Iberian Chain (Teruel, Spain)","authors":"Belén Oliva-Urcia,&nbsp;Antonio Casas-Sainz","doi":"10.1007/s11200-026-00022-9","DOIUrl":"10.1007/s11200-026-00022-9","url":null,"abstract":"","PeriodicalId":22001,"journal":{"name":"Studia Geophysica et Geodaetica","volume":"70 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11200-026-00022-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147937743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comments on the Article “Magnetic Signature of the Camarena de la Sierra Jurassic Magmatism in the SE Iberian Chain (Teruel, Spain)” by Belén Oliva-Urcia and Antonio Cassas-Sainz","authors":"José Emilio Cortés","doi":"10.1007/s11200-026-00021-w","DOIUrl":"10.1007/s11200-026-00021-w","url":null,"abstract":"<div><p>Drs. Oliva and Cassas assert in their paper that the magmatic bodies I dated using biostratigraphic methods are intrusions. However, magmatic materials are actually volcanic products, not intrusions. The dating of volcanic bodies was done indirectly; I dated the pre- and post-volcanic sediments, and then inferred the age of the volcanic bodies based on those dates. This method cannot be applied to intrusive bodies.</p></div>","PeriodicalId":22001,"journal":{"name":"Studia Geophysica et Geodaetica","volume":"70 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147829283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mineral Magnetism of Potting Soils and Vermicomposts Employed As a Fast and Green Tool for Substrate Quality Evaluation","authors":"Daniel Ishlyamski,&nbsp;Deyan Lesigyarski,&nbsp;Bozhurka Georgieva,&nbsp;Diana Jordanova,&nbsp;Neli Jordanova","doi":"10.1007/s11200-026-00004-x","DOIUrl":"10.1007/s11200-026-00004-x","url":null,"abstract":"<div><p>Proximal sensing receives increasing attention in soil science and potting media research because of favorable simplicity, speed and nature-friendly approaches. The aim of the present study is to test the utility of the environmental magnetic methods for quality characterization of various potting substrates. A pilot collection of ten samples from commercially available growing media (potting soils, potting mixes and vermicomposts) was analyzed using mineral magnetic methods (magnetic susceptibility (<i>ꭓ</i>), percent frequency-dependent magnetic susceptibility (<i>ꭓ</i>_fd%), anhysteretic (ARM) and isothermal (IRM) remanent magnetizations, thermomagnetic analysis of magnetic susceptibility). Elemental composition was determined using pXRF spectrometer. The results show that the magnetic signal of potting substrates is governed by the content of the mineral fraction, being the highest in potting soils and vermicomposts. Magnetic data suggest that most of the magnetic particles are coarse multidomain and stable single domain grains. Correlation analysis between magnetic parameters, elemental composition and pH show that the strongest correlation is observed between <i>ꭓ</i> and ARM with the K₂O content and pH. It is proposed that this relation reflects both pedogenic and lithogenic contribution of iron oxides in compost media. In a germination experiment with tomato seeds, magnetic ratio ARM/IRM_2T of potting substrates correlates with the mean seedlings length. Results obtained show that magnetic measurements can be used as a fast proxy for assessment of substrates’ nutrient content and pH.</p></div>","PeriodicalId":22001,"journal":{"name":"Studia Geophysica et Geodaetica","volume":"70 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hematite Anisotropy Constant by Means of Torque Magnetometry Rotational Hysteresis","authors":"Fátima Martín Hernández,&nbsp;Ann M. Hirt","doi":"10.1007/s11200-026-00014-9","DOIUrl":"10.1007/s11200-026-00014-9","url":null,"abstract":"<div><p>Hematite, a common iron oxide carrier of remanence magnetization, is the most oxidized mineral in the Fe-Ti–O system. Despite its significance, aspects of its magnetic structure remain largely unexplored. While general properties have been described in the early twentieth century, a comprehensive model of the magnetic properties of hematite remains elusive. This research endeavours to provide deeper insights into the internal structure of the anisotropy within the basal plane. Torque curves exhibiting a distinct 6θ term yield a new value for the anisotropy constant within the plane of K₃= 25 Jm^-3, the highest reported value by this method. Additionally, the irreversible torque curve reveals that magnetization, and its rotation, plays a role. Rotational hysteresis facilitates our comprehension of the anisotropy field and energy storage within the anisotropy plane.</p></div>","PeriodicalId":22001,"journal":{"name":"Studia Geophysica et Geodaetica","volume":"70 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Revisiting the Source of Inverse Magnetic Anisotropy with Susceptibility Maps for Magnetite","authors":"Ann M. Hirt,&nbsp;Wyn Williams","doi":"10.1007/s11200-026-00012-x","DOIUrl":"10.1007/s11200-026-00012-x","url":null,"abstract":"<div><p>The anisotropy of magnetic susceptibility (AMS) arises from the preferential alignment of minerals within a rock or sediment, which is known as a magnetic fabric. To interpret magnetic fabrics in a geological context, it is essential to understand how the constituent minerals in a rock contribute to the measured fabric. We present a new analysis, employing a micromagnetic approach, to characterize the susceptibility of non-interacting particles of magnetite in the single-domain (SD) or single vortex (SV) domain state. The orientation and magnitudes of the principal susceptibilities can be derived from a susceptibility map. We investigate the combined role of magnetocrystalline and shape anisotropy in rotationally oblate and prolate and triaxial ellipsoidal particles of varying axial ratio, on the orientation and magnitude of the AMS. SD particles exhibit an inverse magnetic fabric, where the smallest susceptibility is along the easy axis of magnetization of the ellipsoid. SV particles, on the other hand, can have either a normal magnetic fabric when the particle elongation is not large, i.e., the largest susceptibility is along easy axis, or an inverse fabric when the particle is more strongly elongated. The underlying explanation for the variation of fabric lies with the relative orientation of the remanence carrying vortex core within a particle with respect to the principal axes of the ellipsoid. Susceptibility maps can also be generated for assemblies of particles with variable orientation, which allows us to examine how orientation influences the total AMS. Although we present a limited number of simple models, the method can be extended to more natural mineral shapes and an array of particles that represent their distribution within a rock or sediment.</p></div>","PeriodicalId":22001,"journal":{"name":"Studia Geophysica et Geodaetica","volume":"70 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11200-026-00012-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the Seasonal Quiet Daily Variations at the Lonjsko Polje Geomagnetic Observatory (Croatia)","authors":"Eugen Vujić,&nbsp;Igor Mandić,&nbsp;Tanja Trošić Lesar,&nbsp;Dino Curman","doi":"10.1007/s11200-026-00005-w","DOIUrl":"10.1007/s11200-026-00005-w","url":null,"abstract":"<div><p>The behaviour of the quiet daily variations during different levels of solar activity over midlatitudes in Europe was the motivation for this study. The main aim was to determine the quiet daily variations from the Lonjsko Polje observatory (Croatia), for the first time. The hourly mean values of the three orthogonal components from 2013 to 2023 were used to examine and build an empirical model of the quiet daily variations for Lloyd’s seasons. An empirical model with 1071 coefficients per component was developed based on the assumptions that it depends on local time, lunar age, season, and solar activity, represented by solar radio flux at 10.7 cm. The obtained model suggests that amplitude levels rise, and phase variations are affected by increasing solar activity. The derived seasonal variations were compared to the variations from the Fürstenfeldbruck, Panagjurishte and Tihany observatories during 2013−2021. Due to the absence of data from Lonjsko Polje during periods of higher solar activity, seasonal variations were examined using records from Fürstenfeldbruck and Panagjurishte over the period 1956−2021 and Tihany over 1997−2021. The modelled patterns of seasonal variations with different levels of solar activity showed good agreement with the observations. The seasonal variations from Fürstenfeldbruck and Panagjurishte averaged over each of six consecutive nonoverlapping 11-year intervals during 1956−2021 are highly correlated, while some scatter up to 7 nT is observed for each geomagnetic component, depending on local time. The seasonal variations at Lonjsko Polje for the period of 1956 to 2012 were reconstructed using a multilinear regression analysis of data from Fürstenfeldbruck and Panagjurishte, with the maximum amplitudes of 30, 90, and 40 nT for the north, east, and vertical components, respectively. The results from this study could lead to a possible investigation of the equivalent ionospheric and induced currents responsible for derived variations.</p></div>","PeriodicalId":22001,"journal":{"name":"Studia Geophysica et Geodaetica","volume":"70 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147642763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}