Studia Geophysica et Geodaetica最新文献

{"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}

{"title":"Magnetic Fabrics and Provenance Directions of Mid-Late Jurassic Pyroclastic Flows from the Northern Antarctic Peninsula","authors":"Florencia N. Milanese,&nbsp;Laila Iacono,&nbsp;Pablo R. Franceschinis,&nbsp;Florencia Boedo,&nbsp;Miguel Gumina,&nbsp;Carla Puigdomenech Negre,&nbsp;Rodrigo Feo,&nbsp;Joaquín Gil,&nbsp;Jorge Lozano,&nbsp;Julián Agostini,&nbsp;Matías Naselli,&nbsp;Manuel Montes,&nbsp;Augusto E. Rapalini","doi":"10.1007/s11200-026-00015-8","DOIUrl":"10.1007/s11200-026-00015-8","url":null,"abstract":"<div><p>The paleogeographic evolution of the Antarctic Peninsula during the Gondwana breakup remains poorly constrained. Reconstructing the eruptive sources of the voluminous Jurassic Chon Aike Province is crucial for refining or challenging existing tectonic models. This study presents new Anisotropy of Magnetic Susceptibility (AMS) data from Mid-to-Late Jurassic pyroclastic units in the northern Antarctic Peninsula to address these uncertainties. Bulk magnetic susceptibility values between 30–80 µSI, thermomagnetic curves, and hysteresis cycles indicate a normal (non-inverse) AMS fabric. Lack of evidence of tectonic overprint sustains a primary origin for the AMS fabric. Volcanic paleoflow directions were determined using K3 imbrication and, to a lesser extent, K1 magnetic lineations. Our results for the pirolastic Kenney Glacier Formation reveal a significant shift in volcanic sourcing: a source area located to the NW of Mount Flora in the basal units (Kenney 1 and lower Kenney 2 Members). A systematic change in the source area, coming from the ESE in Kenney 2 and 3 and from the SE in Kenney 4 Member. Integrating these results into a ~ 160 Ma paleoreconstruction, we propose a model for the Kenney Glacier Formation that aligns with current tectonic frameworks for the Graham Land Volcanic Group. In this restored geometry, flows originated from the SE (Kenney 1), shifting to the NNW (Kenney 2 and 3), and finally to the NE (Kenney 4). These findings provide evidence of shifting volcanic centers during the V2 episode of Jurassic magmatism in West Gondwana.</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":"147642764","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":"Magnetic fabrics and paleomagnetism of continental mudrocks: Implications for unravelling the tectonic evolution of the South Pyrenean Zone (NE Spain)","authors":"Pablo Sierra-Campos,&nbsp;Pablo Calvín,&nbsp;Esther Izquierdo-Llavall,&nbsp;Manuel Montes,&nbsp;Aránzazu Luzón,&nbsp;Eva Bellido,&nbsp;Elisabet Beamud,&nbsp;Emilio L. Pueyo,&nbsp;Juan Cruz Larrasoaña","doi":"10.1007/s11200-026-00018-5","DOIUrl":"10.1007/s11200-026-00018-5","url":null,"abstract":"<div><p>The anisotropy of the magnetic susceptibility (AMS) in mudrocks has been widely used to study orogenic belts due to their sensitivity to strain, while paleomagnetism remains the most effective method to quantify vertical axis rotations (VARs) resulting from the accommodation of along-strike variations in shortening. However, AMS can be also eventually used as a passive marker to detect VARs and the integration of both techniques offers a powerful approach to understand the tectonic evolution of fold-and-thrusts-belts. In this work, a combined AMS and paleomagnetic study along a stratigraphic section of continental rocks from the Campodarbe Formation in the Jaca-Pamplona Basin, southern Pyrenees, was carried out. This stratigraphic section (Martes section) records the tectonic evolution of this part of the basin from Priabonian to Rupelian times. The magnetic fabrics show the imprint of early stages of deformation, characterized by dominantly oblate ellipsoids and WNW-ESE horizontal magnetic lineations (axes of maximum magnetic susceptibility k_max), parallel to bedding and the main regional structures. In the lower part of the section, k_max axes trend around 290º, gradually rotating to 270º towards the top. The AMS is interpreted as locked under the imprint of the layer parallel shortening (LPS) associated to the activity of the basement thrusts in the northern Jaca-Pamplona Basin. On the other hand, paleomagnetic data indicate clockwise VARs of 6º to 12º in the lower part of the section, and a counterclockwise rotation of 7º to 14º in the upper part. These differential rotations could result from lateral changes in the Biniés basement thrust or the Jaca thrust system that were active during Oligocene times. Both techniques record a net rotation of ca. 25º between the lower and upper part of the section, which support the interpretation that early-locked AMS behaves as a passive marker and validates its use for detecting and quantifying VARs.</p></div>","PeriodicalId":22001,"journal":{"name":"Studia Geophysica et Geodaetica","volume":"70 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11200-026-00018-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606723","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":"Using Scalar Data from the Magnetic Fabric of Shales to Estimate Strain","authors":"Charles Aubourg","doi":"10.1007/s11200-026-00006-9","DOIUrl":"10.1007/s11200-026-00006-9","url":null,"abstract":"<div><p>The utilisation of magnetic fabric constitutes a rapid and non-destructive technique; however, its primary disadvantage is that it is carried by multiple magnetic phases. Consequently, it is imperative to furnish structural geologists with target rocks whose mineralogy is as elementary as possible in order to quantify strain. It is evident that non-metamorphic shales are of interest due to the fact that magnetic susceptibility is primarily exhibited by phyllosilicates, including smectites, illites and chlorites. The use of magnetic fabric facilitates the identification of the contribution of billions of these clay particles. The present study utilises published data to demonstrate the feasibility of employing scalar data for the purpose of monitoring the evolution of vertical compaction during diagenesis, or horizontal compaction during the development of layer-parallel shortening, or strain induced by fault propagation. The examples presented demonstrate that the quantification of strain is possible when cleavage is significantly oblique to the bedding. The extraction of these scalar data is facilitated by the measurement of a minimal quantity of unoriented shale fragments, thereby enabling the execution of large-scale statistical studies.</p></div>","PeriodicalId":22001,"journal":{"name":"Studia Geophysica et Geodaetica","volume":"70 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606636","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":"Magnetic Signature of the Camarena de la Sierra Jurassic Magmatism in the SE Iberian Chain (Teruel, Spain)","authors":"Belén Oliva-Urcia,&nbsp;Antonio Cassas-Sainz","doi":"10.1007/s11200-026-00016-7","DOIUrl":"10.1007/s11200-026-00016-7","url":null,"abstract":"<div><p>Magnetic fabrics are commonly studied to understand the magma flow in volcanic and hypovolcanic settings. In this work we present a magnetic fabric study in the Sierra de Javalambre (SE Iberian Chain), a geological unit that includes a swarm of Mesozoic volcanic intrusive and extrusive bodies associated with a hotspot and extensional deformation in Eastern Iberia during the Mesozoic. The sill sampled in this work is constituted by alkaline dolerites (ocean island basalts, OIB composition) and is a part of more than a hundred outcrops emplaced in Upper Triassic (Keuper facies) diapiric units and Jurassic limestones. The presence of Ti-poor titanomagnetite in the studied hypovolcanic rocks is inferred from temperature-dependent magnetic susceptibility curves and also from analyses of the three components isothermal remanent magnetization (IRM), since the decay of the magnetic susceptibility and the soft axis (0.12 mT) of the IRM occurs at 580°C. The magnetic susceptibility shows high values, in average 17554 × 10^–6. The anisotropy of the magnetic susceptibility shows some dispersion of the maximum and intermediate axes on the bedding plane, whereas the minimum axes are clustered almost perpendicular to the bedding plane for the 158 standard analyzed samples. The magnetic lineation (clustering of the maximum axes of the anisotropy of magnetic susceptibility) is bimodal with WNW-ESE and NNE-SSW directions in the in-phase magnetic susceptibility, and can be interpreted as the flow direction of the magma controlled by the NW–SE and N-S extensional fault systems during the basinal (Jurassic) stage.</p></div>","PeriodicalId":22001,"journal":{"name":"Studia Geophysica et Geodaetica","volume":"70 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11200-026-00016-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606639","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":"Lineation of the Anisotropy of Magnetic Susceptibility in the Wrench-Dominated Transpression","authors":"Josef Ježek","doi":"10.1007/s11200-026-00011-y","DOIUrl":"10.1007/s11200-026-00011-y","url":null,"abstract":"<div><p>The model of transpression is a standard framework for tectonic studies. It describes homogeneous deformation in a weak zone between two obliquely convergent rigid blocks. Depending on the angle of convergence, pure shear-dominated transpression and wrench-dominated transpression (WDT) can be distinguished in which the lineation (first eigenvector of finite strain ellipsoid) is vertical or switches from initially horizontal to vertical. In practice, lineation is often determined using the AMS method, i.e. based on the preferred orientation of magnetic grains. Under special circumstances, such as transpression, this can lead to differences in lineation defined by the strain ellipsoid and lineation defined by grains. This paper aims to fill the gap in knowledge on this issue. Mathematical modelling based on continuum mechanics quantifies how the switching of lineation in WDT depends on the grain axial ratio. This process is projected into the tensor of magnetic anisotropy and may be further modulated by the presence of subpopulations of magnetic grains or the variability of their shape and magnetic properties. It is shown that the switching of AMS lineation in WDT occurs at lower strain than by the lineation defined by strain ellipsoid.</p></div>","PeriodicalId":22001,"journal":{"name":"Studia Geophysica et Geodaetica","volume":"70 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606711","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}