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Journal articles on the topic 'Palaeomagnetic study'

Author: Grafiati

Published: 6 September 2023

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1

Tiano, Pasquale, Alberto Incoronato, and Donald H. Tarling. "Palaeomagnetic study on Vesuvius lava flows." Geophysical Journal International 163, no. 2 (November 2005): 518–26. http://dx.doi.org/10.1111/j.1365-246x.2005.02768.x.

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2

Thouveny, N. "High-resolution palaeomagnetic study of Late Pleistocene sediments from Baffin Bay:first results." Canadian Journal of Earth Sciences 25, no. 6 (June 1, 1988): 833–43. http://dx.doi.org/10.1139/e88-082.

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The detailed palaeomagnetic study of core 85027016, collected in central Baffin Bay, confirms the occurrence of anomalous directions in the depositional remanent magnetization, previously observed in the upper part of the Pleistocene sequence. Chronology and sedimentation rates are discussed on the basis of new 14C ages, 18O isotopic stratigraphy, and palaeoclimatic arguments provided by other works. Two successions of anomalous inclinations are recorded between 15 000 and 30 000 years BP, preceded by long-period secular variations. The possible occurrence of geomagnetic excursions in this region is discussed in considering contemporaneous high-resolution palaeomagnetic records of the Northern Hemisphere.

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3

Taylor, G. K. "A palaeomagnetic study of a Caledonian ophiolite." Geophysical Journal International 94, no. 1 (July 1988): 157–66. http://dx.doi.org/10.1111/j.1365-246x.1988.tb03435.x.

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4

Yan, Yonggang, Qian Zhao, Donghai Zhang, Punya Charusiri, Baochun Huang, and Peizhen Zhang. "Palaeomagnetism of Late Triassic volcanic rocks from the western margin of Khorat Basin, Thailand and its implication for ambiguous inclination shallowing in Mesozoic sediments of Indochina." Geophysical Journal International 219, no. 2 (July 23, 2019): 897–910. http://dx.doi.org/10.1093/gji/ggz331.

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SUMMARY Palaeomagnetic constraints are essential factors in the reconstruction of the Mesozoic convergence of Eastern Asia blocks. As one of the key blocks, Indochina was constrained only by sedimentary-rocks-derived palaeomagnetic data. To evaluate whether the palaeomagnetic data used to restore the Late Triassic position of Indochina suffered inclination shallowing effects, we conducted a palaeomagnetic and geochronologic study on a coeval volcanic clastic rocks sequence in the western margin of the Khorat Basin, Thailand. The U-Pb SIMS dating on zircons indicates the age of the sampling section is between 205.1 ± 1.5 and 204.7 ± 1.4 Ma. Site mean directions are Dg/Ig = 217.2°/−39.4° (κg = 45.1, α95g = 10.1°) before and Ds/Is = 209.2°/−44.5° (κs = 43.8, α95s = 10.2°) after tilt correction. The new data set indicates a positive reversal test result at ‘Category C’ level. The characteristic remanent magnetization recorded by the coexistent magnetite and hematite is interpreted to be primary remanence acquired during the initial cooling of the volcanic clastic rocks. The consistence of the corresponding palaeolatitudes derived from the volcanic clastic rocks and the former reported sedimentary rocks suggests that there is probably no significant inclination shallowing bias in the sedimentary-rocks-derived palaeomagnetic data. Therefore, the estimates of the Late Triassic position of Indochina are confirmed to be reliable. The Indochina Block had collided to the southern margin of Eurasia by the Late Triassic and played an important role in the Mesozoic convergence of the Eastern Asia blocks.

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5

Darabi, M. H., and J. D. A. Piper. "Palaeomagnetic study of the Canisp Porphyry, NW Scotland: an Early Silurian palaeomagnetic pole from the Laurentian Foreland." Scottish Journal of Geology 40, no. 1 (April 2004): 83–92. http://dx.doi.org/10.1144/sjg40010083.

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6

Jele ska, M., and M. Lewandowski. "A palaeomagnetic study of Devonian sandstone from Central Spitsbergen." Geophysical Journal International 87, no. 2 (November 1, 1986): 617–32. http://dx.doi.org/10.1111/j.1365-246x.1986.tb06641.x.

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7

Garde, S. C., and I. O. Ayeni. "A palaeomagnetic study of Cainozoic basalts from Northern Nigeria." Geophysical Journal International 106, no. 3 (September 1991): 717–23. http://dx.doi.org/10.1111/j.1365-246x.1991.tb06344.x.

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8

Bylund, Göuran, and Erik Halvorsen. "Palaeomagnetic Study of Mesozoic Basalts From Scania, Southernmost Sweden." Geophysical Journal International 114, no. 1 (July 1993): 138–44. http://dx.doi.org/10.1111/j.1365-246x.1993.tb01473.x.

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9

Hlavatskyi, D. V. "Refined magnetostratigraphic position of the Shyrokyne unit in loess sequences from Central Ukraine." Journal of Geology, Geography and Geoecology 28, no. 2 (July 4, 2019): 301–12. http://dx.doi.org/10.15421/111930.

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The youngest geomagnetic polarity reversal, the Matuyama–Brunhes boundary (MBB), which occurred 780 kyr ago, is a “golden spike” in the age calibration of sediment sequences. The use of palaeomagnetic method as a stratigraphic tool in the study of loess sequences from Ukraine originated some 50 years ago. One major problem in using the available data is the contradictory position of the MBB in different stratigraphic units, which affected historic evolution of thechronostratigraphic models of the Quaternary in Ukraine. The most important units in this regard are the Shyrokyne and Martonosha units, in which the MBB had been defined most often. This paper provides the careful analysis of the previous magnetostratigraphic data and new preliminary results from key loess-palaeosol sections in Central Ukraine. Shyrokyne palaeosol complex in four loesspalaeosol sections located in the Middle Dnieper and Podolia regions has been palaeomagnetically studied. It is shown that the transition zone of the Matuyama–Brunhes palaeomagnetic reversal is most likely located at the base of the soil complex. In the Vyazivok section the MBB has been found in the lowermost part of Shyrokyne palaeosol sh1. Preliminary palaeomagnetic studies of theStari Kaydaky section reveal that the MBB cannot be defined at least above sh1 subunit. Medzhybizh and Holovchyntsi sections were deposited after the Matuyama–Brunhes reversal; however, the palaeomagnetic informativeness of the part of studied strata is doubtful. Magnetostratigraphic position of the Shyrokyne unit below the MBB in some previous studies is explained by methodological reasons and inconsistent chronostratigraphic models. The paper substantiates that normal magnetic polarity zone in the Pryazovya loess and upper part of the Shyrokyne soil is not associated with the influence of secondary processes on the palaeomagnetic record.

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10

Hlavatskyi, D. V., Y. M. Veklych, V. G. Bakhmutov, V. V. Shpyra, T. V. Skarboviychuk, V. I. Yakukhno, and I. B. Poliachenko. "Palaeomagnetic suitability of a new section with a potential lower boundary for the Quaternary on the left bank of the lower River Danube." Geofizicheskiy Zhurnal 44, no. 4 (September 25, 2022): 38–50. http://dx.doi.org/10.24028/gj.v44i4.264840.

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A first palaeomagnetic study has been carried out on a new section with a potential lower boundary interval for the Quaternary, Dolynske 3. Recently, the Matuyama-Brunhes boundary (at 780 ka) was detected in the adjacent section of Dolynske 2. The current study focuses on the hydromorphic palaeosols, loesses and pedosediments of the Bogdanivka to Kryzhanivka units. Taking into account previous palaeomagnetic data from other sections of the loess/soil formation of Ukraine, the Gauss-Matuyama boundary (2.58 Ma) could be expected to be at the top of the Bogdanivka soil unit. However, rock magnetic and magnetostratigraphic results from the Dolynske 3 section indicate an extremely low concentration of the ferrimagnetic minerals and the absence of a characteristic component of magnetisation due to the influence of hydromorphism. Only two samples from the Bogdanivka and Berezan units show a clearly defined reversed polarity; the rest of the samples were uninformative and were rejected from the interpretation. Given the unsuitability of hydromorphic palaeosols and loesses for magnetostratigraphic studies, the determination of the Gauss-Matuyama boundary requires additional, including methodological, research on other sections of Ukraine. The stratigraphic completeness of the composite Dolynske section, its geomorphological location within the Pliocene Danube terraces and convenient geographical setting allow offering it for study as a reference section for the loess/soil formation in Europe. In addition, the Dolynske 3 section potentially may be regarded as a complete continental analogue of the Calabrian and Gelasian with both palaeomagnetic boundaries. Thus, the Dolynske section deserves research on many aspects of the Quaternary, including correlations of loess-palaeosol, alluvial and marine facies, the influence of hydromorphism on palaeomagnetic properties of rocks, «structures» of climatic rhythms in the Calabrian and Gelasian, as part of a separate international project.

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11

Elming, Sten-ÅKe. "A palaeomagnetic study of Svecokarelian basic rocks from northern Sweden." Geologiska Föreningen i Stockholm Förhandlingar 107, no. 1 (March 1985): 17–35. http://dx.doi.org/10.1080/11035898509452608.

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12

Iosifidi, A. G., S. Bogdanova, A. N. Khramov, and G. Bylund. "Palaeomagnetic study of Palaeoproterozoic granitoids from the Voronezh Massif, Russia." Geophysical Journal International 137, no. 3 (June 1, 1999): 723–31. http://dx.doi.org/10.1046/j.1365-246x.1999.00818.x.

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13

Villasante-Marcos, V., M. L. Osete, F. Gervilla, and V. García-Dueñas. "Palaeomagnetic study of the Ronda peridotites (Betic Cordillera, southern Spain)." Tectonophysics 377, no. 1-2 (December 2003): 119–41. http://dx.doi.org/10.1016/j.tecto.2003.08.023.

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14

Belluso, Elena, and Roberto Lanza. "Palaeomagnetic results from the middle Tertiary Meander Intrusives of northern Victoria Land, East Antarctica." Antarctic Science 8, no. 1 (March 1996): 61–72. http://dx.doi.org/10.1017/s0954102096000107.

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The Tertiary stocks (Meander Intrusives) cropping out along the coasts of the Ross Sea were sampled for a palaeomagnetic study during the sixth Italian expedition to northern Victoria Land. Laboratory investigations concerned magnetic mineralogy and remanent magnetization. Minerals of the magnetiteulvöspinel series occur in the rocks from all stocks, with low-Ti titanomagnetite usually prevalent. Haematite and goethite occur in small amounts as alteration products. Large secondary components commonly screen the characteristic remanent magnetization and were removed by thermal or AF demagnetization at temperatures or peak-fields higher than 360°C and 20 mT respectively. A total of 10 VGPs were obtained from radiometrically dated rocks (42–22 Ma); the averaged position (69°S, 334°E; α95=9.9°) is the first middle Tertiary palaeomagnetic pole for East Antarctica, and gives evidence for a reversal in the course of the APW path. This evidence is not substantially altered by a supposed tilt-correction consistent with geophysical and geological models for the uplift of the Transantarctic Mountains. No definite conclusion about relative movements between East Antarctica and the Antarctic Peninsula can be drawn from the existing palaeomagnetic data.

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15

Rodríguez-Trejo, A., L. M. Alva-Valdivia, M. Perrin, G. Hervé, and N. López-Valdés. "Analysis of geomagnetic secular variation for the last 1.5 Ma recorded by volcanic rocks of the Trans Mexican Volcanic Belt: new data from Sierra de Chichinautzin, Mexico." Geophysical Journal International 219, no. 1 (July 10, 2019): 594–606. http://dx.doi.org/10.1093/gji/ggz310.

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Summary The great wealth of volcanism along the Trans Mexican Volcanic Belt (TMVB) and the need to improve the secular variation curve of the Earth magnetic field of the region is the aim of this research. 300 oriented cores from 33 sites and 21 individual cooling units were acquired from Sierra de Chichinautzin volcanic field (ChVF) and Sierra de Santa Catarina (SSC). Directional analysis and rock magnetic experiments were performed (e.g. thermal demagnetization, hysteresis loop, susceptibility vs temperature), achieving 21 new averaged palaeomagnetic directions. New results are consistent with the previous studies on the same cooling unit. We compiled all the palaeomagnetic studies performed on the ChVF, updating age and calculating an average direction per cooling unit and estimating an overall mean direction for the ChVF (Dec = 359.1°, Inc = 35.3°, N = 33, k = 21.6, α95 = 5.5°, Plat = 87.7° N, Plong = 227.4° E, K = 31.8, A95 = 4.5°). Afterwards, we compiled all the previous palaeomagnetic studies along the whole TMVB with age ranging from 0 to 1.5 Ma, and constrained the directional analyses by specific quality criteria such as well-defined age, number of samples and quality of kappa) on the cooling unit consistency. The mean direction and virtual geomagnetic pole (VGP) estimated for the TMVB, during the periods 0–40 ka and 0–1.5 Ma, are close to the geographic pole, supporting the validity of the geocentric axial dipole hypothesis. The directional results of this study also fit well with the predictions at Mexico City of the models SHA.DIF.14k and CALS10k2 calculated for the last 14 ka. The dispersion of the VGP's on the TMVB are also consistent with the expected values proposed by different models of palaeosecular variation. However, large gaps in the temporal record remain that should be filled by further palaeomagnetic studies.

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16

Αηδονά, Ε., Δ. Κοντοπούλου, and R. Scholger. "RE-ORIENTANTION METHODS OF CORE SAMPLES: IMPLICATIONS TO SEDIMENT CORES FROM N. GREECE." Bulletin of the Geological Society of Greece 36, no. 3 (January 1, 2004): 1194. http://dx.doi.org/10.12681/bgsg.16462.

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The different methods of re-orientation of core samples are discussed in the present study. In order to obtain results from core samples concerning the direction of the formation, their permeability and their anisotropy, it is essential first to bring all the pieces of the core into their initial position with regard to the North and to the horizontal (in-situ). In this study we emphasize particularly to the palaeomagnetic technique. This re-orientation method uses the magnetic components of the rocks (especially the viscous component) in order to determine the direction with regard to the North (declination). Also, the anisotropy method which helps us to correct the angle to the horizontal (inclination) is described here. Finally we applied the last two methods in non-oriented core samples from N. Greece and the significant importance of the re-orientation techniques to the palaeomagnetic studies is shown.

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17

Roger, J., S. Sen, H. Thomas, C. Cavelier, and Z. Al Sulaimani. "Stratigraphic, palaeomagnetic and palaeoenvironmental study of the Early Oligocene vertebrate locality of Taqah (Dhofar, Sultanate of Oman)." Newsletters on Stratigraphy 28, no. 2-3 (March 10, 1993): 93–119. http://dx.doi.org/10.1127/nos/28/1993/93.

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18

Hong, Zhu, Yang Guanxiu, and Sheng Axing. "Palaeomagnetic Study of Permian Strata at the Yuzhou-Dafengkou Section, Henan." Acta Geologica Sinica - English Edition 9, no. 4 (May 29, 2009): 356–65. http://dx.doi.org/10.1111/j.1755-6724.1996.mp9004003.x.

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19

Otofuji, Y., Y. Inoue, S. Funahara, F. Murata, and X. Zheng. "Palaeomagnetic study of eastern Tibet-deformation of the Three Rivers region." Geophysical Journal International 103, no. 1 (October 1990): 85–94. http://dx.doi.org/10.1111/j.1365-246x.1990.tb01754.x.

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20

Piper, J. D. A. "Palaeomagnetic study of the Nagssugtoqidian mobile belt in Central-West Greenland." Precambrian Research 28, no. 1 (March 1985): 75–110. http://dx.doi.org/10.1016/0301-9268(85)90075-0.

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21

Elming, Sten-Åke, Mohsen Oveisy Moakhar, and Ol Of Martinsson. "A palaeomagnetic and geochemical study of basic intrusions in northern Sweden." GFF 126, no. 2 (June 2004): 243–52. http://dx.doi.org/10.1080/11035890401262243.

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22

Vizán, Haroldo, Peter Turner, John A. Millson, and Rob A. Ixer. "Palaeomagnetism of the Mahatta Humaid Group (Cambrian – Early Ordovician, Oman), including a re-interpretation of previous Neoproterozoic palaeomagnetic data." GeoArabia 14, no. 2 (April 1, 2009): 71–96. http://dx.doi.org/10.2113/geoarabia140271.

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ABSTRACT We carried out a palaeomagnetic study in the Al-Huqf region (Sultanate of Oman) on rocks that belong to different units of the Cambrian – Ordovician Mahatta Humaid Group. Thirty-nine samples were systematically collected from a succession ca. 520–495 Ma old. Seventeen samples showed characteristic remanent magnetization components with two antipodal polarities carried by hematite. Evidence suggests that these components have a primary origin. A detailed petrographic analysis revealed syntaxial overgrowths parallel to the easy plane of magnetization of the magnetic carriers that has probably enhanced and reinforced the primary magnetization. A palaeopole computed with the mean direction of the 17 characteristic remanent magnetization components was considered alongside previously published Neoproterozoic – early Palaeozoic palaeomagnetic data, which we placed in an updated chronostratigraphic framework for the Neoproterozoic – Cambrian Huqf Supergroup. Two interpretations were considered: (1) Oman was detached from the Arabian-Nubian craton until ca. 660 Ma, and it became attached (or was nearby) to it by ca. 630 Ma. In this interpretation, an apparent polar wander (APW) path of Arabia is proposed between ca. 630 and 500 Ma. The palaeomagnetic directions of Mirbat obtained by Killner et al. (2005) in rocks 720–660 Ma old are therefore assumed as primary, and taking into account that Oman was an independent block of the Arabian-Nubian craton, the corresponding palaeopole is not considered in the proposed segment of the Arabian APW path. (2) The Neoproterozoic data belong to two different tectonic blocks within the Arabian-Nubian craton and were involved in left-lateral, strike-slip movements along NW-trending faults. One block included the localities of Al Jabal al-Akhdar and Al-Huqf and may have rotated counter-clockwise c. 45° about a vertical axis between ca. 600 and 500 Ma. The other block included the locality of Mirbat and rotated counter-clockwise c. 25° about a vertical axis between ca. 600 and 550 Ma. These suggested block rotations may have played a role in generating the underlying fabrics for some of the sedimentary basins in Oman. In the second model, the rocks sampled by Killner et al. (2005) in Mirbat were re-magnetized during the intrusion of dike swarms at ca. 615–600 Ma.

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23

IZQUIERDO-LLAVALL, ESTHER, ANTONIO CASAS-SAINZ, BELÉN OLIVA-URCIA, and ROBERT SCHOLGER. "Palaeomagnetism and magnetic fabrics of the Late Palaeozoic volcanism in the Castejón-Laspaúles basin (Central Pyrenees). Implications for palaeoflow directions and basin configuration." Geological Magazine 151, no. 5 (November 7, 2013): 777–97. http://dx.doi.org/10.1017/s0016756813000769.

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AbstractThe Castejón-Laspaúles basin is one of the South Pyrenean basins of Late Variscan age that were strongly inverted during the Alpine compression (Late Cretaceous–Tertiary). It is mainly composed by Stephanian pyroclastic and volcanic deposits that reach a maximum thickness of ~ 500 m, and are overlain by Permian and Triassic sedimentary units. A palaeomagnetic and magnetic fabrics (AMS) study was carried out in the Stephanian units, where the general absence of flow markers at the outcrop scale and the Alpine inversional structure prevent the straightforward reconstruction of the original volcanic and basinal configuration. Magnetic fabric data are not overprinted by Alpine internal deformation and can be interpreted in terms of primary volcanic and pyroclastic fabrics. The obtained directions coincide in the different sampled units, suggesting a constant source area during the development of the basin, and show the dominance of N–S-trending K1 axes that are interpreted to be parallel to flow directions. Palaeomagnetic data indicate the presence of a pre-folding palaeomagnetic component that is rotated clockwise by an average of +37° (±32°) with regards to the Stephanian reference. This rotation probably took place during Alpine thrusting since it is also registered by the overlying Triassic deposits. The whole dataset is interpreted in terms of basin development under sinistral transtension with two main fault sets: deep-rooted E–W-striking faults, probably responsible for magmatic emissions, and shallow-rooted, listric faults of N–S orientation.

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24

Kondopoulou, D., I. Zananiri, A. Michard, H. Feinberg, A. Atzemoglou, J. P. Pozzi, and Ph Voidomatis. "NEOGENE TECTONIC ROTATIONS IN THE VICINITY OF THE NORTH AEGEAN TROUGH: NEW PALAEOMAGNETIC EVIDENCE FROM ATHOS AND SAMOTHRAKI (GREECE)." Bulletin of the Geological Society of Greece 40, no. 1 (June 8, 2018): 343. http://dx.doi.org/10.12681/bgsg.16590.

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The present study focuses on two post-orogenic plutons, the Athos (Grigoriou) and Samothraki granites, as well as the Samothraki volcanics, located in the vicinity of the North Aegean Trough. A detailed palaeomagnetic study was carried out, with the aim of constraining the age and mechanism of tectonic rotations. In addition, anisotropy of low field magnetic susceptibility (AMS) was studied and isothermal remanent magnetization (IRM) and thermomagnetic analyses were performed. Finally, a radiometric age for the Athos granite was obtained (43.3 ± 1.0 Ma K/Ar biotite). The measured declinations indicate clockwise rotations of the Athos (16.6°) and Samothraki (36.3°) blocks. The age of rotation is constrained to be <18 Ma at Samothraki, whereas the much smaller rotation of the Athos block can only be dated as younger than Eocene. Comparing the new palaeomagnetic data to the published dataset for Northern Greece, we suggest that the palaeomagnetically determined rotations in the vicinity of the North Aegean Trough are dominantly of post-Early Miocene age, and are controlled by major strike-slip faults and distributed "small" or minor faults.

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25

Satolli, Sara, Simone Agostini, and Fernando Calamita. "Behaviour of minor arcuate shapes hosted in curved fold-and-thrust belts: an example from the Northern Apennines (Italy)." Geological Magazine 156, no. 9 (January 28, 2019): 1547–64. http://dx.doi.org/10.1017/s0016756818000845.

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AbstractArcuate fold-and-thrust belts have been extensively studied in the literature. Less attention, however, has been paid to the characteristics of local-scale arcuate structures, meaning 5–10 km long fold or thrust traces that display map-view curvature. Nevertheless, detailed investigation of small arcuate structures hosted in major arcs can contribute to understanding the pervasiveness of deformation mechanisms. We performed a combined geological and palaeomagnetic study on 21 sites from ac. 60 km2area in the Northern Apennines in order to analyse minor arcs at a kilometric scale. As evidenced by the geological and structural analysis performed on the 21 sites, the fold axial trend changes from N–S to NW–SE in the study area. The comparison with palaeomagnetic results shows the lack of correlation between vertical axis rotations and fold axial trends. As a consequence, the minor arcuate shapes of thrusts and related folds are interpreted as mostly primary features inherited from the geometry of the palaeomargin, represented by pre-orogenic faults, according to a context of inversion tectonics.

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26

Abou Deeb, J. M., M. M. Otaki, D. H. Tarling, and A. L. Abdeldayem. "A palaeomagnetic study of Syrian volcanic rocks of Miocene to Holocene age." Geofísica Internacional 38, no. 1 (January 1, 1999): 17–26. http://dx.doi.org/10.22201/igeof.00167169p.1999.38.1.896.

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Rocas volcánicas del Mioceno y más jóvenes de varias localidades de Siria muestran polaridades normales y reversas después de desmagnetización térmica. Las similitudes en las direcciones medias de magnetización pueden ser usadas para establecer correlación entre lavas. Las polaridades observadas sugieren que algunas de las lavas del Cuaternario son más antiguas de lo propuesto en cartografías previas. Los sitios con direcciones medias reversas e intermedias presentan una dispersión angular mayor que la observada en los sitios de direcciones normales. La dispersión media global es mayor que la esperada de acuerdo con los modelos de variación secular simulados con deriva al oeste o este y el campo dipolar inclinado actual. Los sitios de polaridad normales tienen magnetizaciones dos veces mayores que los sitios de polaridad reversa e intermedia. La dirección media para los sitios del Cuaternario es consistente con el campo dipolar axial, pero para los sitios del Mioceno, con direcciones antipodales de polaridades opuestas, tienen una inclinación media más somera que la dipolar, lo que sugiere un efecto geomagnético o inclinación regional tectónica.

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27

Juárez, M. T., M. L. Osete, R. Vegas, C. G. Langereis, and G. Meléndez. "Palaeomagnetic study of Jurassic limestones from the Iberian Range (Spain): tectonic implications." Geological Society, London, Special Publications 105, no. 1 (1996): 83–90. http://dx.doi.org/10.1144/gsl.sp.1996.105.01.07.

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28

Shcherbakova, V. V., V. G. Bakhmutov, V. P. Shcherbakov, G. V. Zhidkov, and V. V. Shpyra. "Palaeointensity and palaeomagnetic study of Cretaceous and Palaeocene rocks from Western Antarctica." Geophysical Journal International 189, no. 1 (February 15, 2012): 204–28. http://dx.doi.org/10.1111/j.1365-246x.2012.05357.x.

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29

Channell, J. E. T., C. McCabe, and N. H. Woodcock. "Palaeomagnetic study of Llandovery (Lower Silurian) red beds in north-west England." Geophysical Journal International 115, no. 3 (December 1993): 1085–94. http://dx.doi.org/10.1111/j.1365-246x.1993.tb01511.x.

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30

Harcombe-Smee, B. J., J. D. A. Piper, T. C. Rolph, and D. N. Thomas. "A palaeomagnetic and palaeointensity study of the Mauchline lavas, south-west Scotland." Physics of the Earth and Planetary Interiors 94, no. 1-2 (March 1996): 63–73. http://dx.doi.org/10.1016/0031-9201(95)03083-2.

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31

Jackson, K. C. "A palaeomagnetic study of Apennine thrusts, Italy: Monte Maiella and Monte Raparo." Tectonophysics 178, no. 2-4 (June 1990): 231–40. http://dx.doi.org/10.1016/0040-1951(90)90149-3.

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32

Poornachandra Rao, G. V. S., and J. Mallikharjuna Rao. "A palaeomagnetic study of charnockites from Madras Block, Southern Granulite Terrain, India." Gondwana Research 10, no. 1-2 (August 2006): 57–65. http://dx.doi.org/10.1016/j.gr.2005.11.015.

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33

Xu, T. C., and D. H. Tarling. "A palaeomagnetic study of the intrusions and Carboniferous sediments at Dunbar, Scotland." Scottish Journal of Geology 23, no. 1 (May 1987): 39–48. http://dx.doi.org/10.1144/sjg23010039.

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34

Márton, E., and L. Fodor. "Combination of palaeomagnetic and stress data—a case study from North Hungary." Tectonophysics 242, no. 1-2 (February 1995): 99–114. http://dx.doi.org/10.1016/0040-1951(94)00153-z.

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35

Dannemann, Sven, Erwin Appel, Wolfgang Rösler, Udo Neumann, Ursina Liebke, and Debarati Nag. "Palaeomagnetic indication for India–Asia collision at 12°N and maximum 810 km Greater India extent in the western suture zone." Geophysical Journal International 229, no. 2 (January 4, 2022): 1193–211. http://dx.doi.org/10.1093/gji/ggab528.

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SUMMARY Knowing the pre-collisional extent of the northern Indian Plate margin (‘Greater India’) is vital to understanding the tectonic evolution of the India–Asia collision and the formation of the Himalayan–Tibetan orogen. However, suitable geological units for palaeomagnetic investigations along the Himalayan belt are limited, which makes it difficult to reconstruct Greater India during the pre-collisional period in Late Cretaceous to Palaeogene. Often the palaeomagnetic results from the Zongpu Formation at Gamba in southern Tibet (∼88.5°E) were used for estimates of Greater India, but their validity was recently questioned. As a contribution to closing the data gap, we performed a palaeomagnetic study of the Palaeocene/Lower Eocene Dibling limestone (DL) in the western Tethyan Himalaya of Zanskar (34.0°N/76.6°E). The results from 27 sites revealed a well grouping (k = 71.7) syntectonic magnetization with best grouping at 52 per cent unfolding. The remagnetization of the DL was acquired shortly after ∼54 Ma, at the latest at ∼49 Ma, and is probably carried by fine-grained magnetite formed during the early orogenic phase. Assuming proportional tilting of the fold limbs, the corresponding palaeolatitude of 11.8 ± 2.4°N suggests a maximum Greater India extent of 810 ± 420 km and a first continental contact with the southern Eurasian margin at ∼12°N in the western part of the suture zone. The tectonostratigraphic equivalence of the DL with the Zongpu Formation at Gamba and a great similarity in their magnetic properties supports a secondary origin of the Gamba results. Through understanding the mechanism of remagnetization in the DL, an early orogenic remanence acquisition is also indicated for the Zongpu Formation, and thus the Gamba results deserve further credit for Greater India reconstructions. However, we note a large inconsistency of the available Late Cretaceous and Palaeogene palaeolatitude data from the Tethyan Himalaya by up to ∼20°, corresponding to differences of up to ∼2000 km in the size of Greater India. These discrepancies require further palaeomagnetic work in the Tethyan Himalaya, and in particular we recommend comparative studies at same locations and of same units.

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DARABI, M. H., and J. D. A. PIPER. "Palaeomagnetism of the (Late Mesoproterozoic) Stoer Group, northwest Scotland: implications for diagenesis, age and relationship to the Grenville Orogeny." Geological Magazine 141, no. 1 (January 2004): 15–39. http://dx.doi.org/10.1017/s0016756803008148.

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The Stoer is the lowest of three groups comprising the Torridonian Supergroup, a clastic succession deposited late in Mesoproterozoic times on the (Lewisian) metamorphic foreland to the Caledonian Orogen in northwest Scotland. This study reports a palaeomagnetic, rock magnetic and magnetic fabric investigation through the full stratigraphic thickness of the succession. A primary magnetic fabric of sedimentary origin defines current flow from a westerly veering to northwesterly source. Rock magnetic studies identify the presence of both magnetite and hematite in these sediments. Magnetite is apparently of primary detrital origin whilst the hematite probably results mostly from early diagenesis in an environment of restricted chemical weathering. Palaeomagnetic study of sedimentary slumps shows that magnetic remanence post-dates deposition but was probably fixed by early dewatering and lithification because slumped blocks of Stoer in basal Torridon Group sediments preserve a primary remanence. Tilt adjustment, although inconclusive, also implies that magnetic remanence is older than pre-Torridian Group tectonic deformation. The lower part of the Stoer succession shows a progressive increase of magnetic inclination with shallower components resident in magnetite and steeper components in hematite. The succession above the Stac Fada Member has the steepest magnetic inclination and shows no significant difference between magnetite and hematite component directions. The inferred time sequence of palaeopoles coincides with the Gardar palaeomagnetic track (∼ 1250–1130 Ma) at 1180 Ma, conforming to a Pb–Pb determination of 1199±70 Ma. The Stoer Group was fully lithified and deformed before deposition of the Torridon Group at ∼ 1030 Ma because it contains no vestige of the range of Caledonian and later overprints found extensively in the latter. Sedimentation and lithification of the Stoer Group are therefore linked with a phase of extensional tectonism at 1200–1150 Ma and deformation is attributed to a culminating phase of deformation in the nearby Grenville Belt at ∼ 1100 Ma.

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37

KAYMAKCI, N., E. ALDANMAZ, C. LANGEREIS, T. L. SPELL, O. F. GURER, and K. A. ZANETTI. "Late Miocene transcurrent tectonics in NW Turkey: evidence from palaeomagnetism and 40Ar–39Ar dating of alkaline volcanic rocks." Geological Magazine 144, no. 2 (February 9, 2007): 379–92. http://dx.doi.org/10.1017/s0016756806003074.

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A number of intra-continental alkaline volcanic sequences in NW Turkey were emplaced along localized extensional gaps within dextral strike-slip fault zones prior to the initiation of the North Anatolian Fault Zone. This study presents new palaeomagnetic and 40Ar–39Ar geochronological results from the lava flows of NW Turkey as a contribution towards understanding the Neogene–Quaternary tectonic evolution of the region and possible roles of block rotations in the kinematic history of the region. 40Ar–39Ar analyses of basalt groundmass indicate that the major volume of alkaline lavas of NW Turkey spans about 4 million years of episodic volcanic activity. Palaeomagnetic results reveal clockwise rotations as high as 73° in Thrace and 33° anticlockwise rotations in the Biga Peninsula. Movement of some of the faults delimiting the areas of lava flows and the timing of volcanic eruptions are both older than the initiation age of the North Anatolian Fault Zone, implying that the region experienced transcurrent tectonics during Late Miocene to Pliocene times and that some of the presently active faults in the region are reactivated pre-existing structures.

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Thistlewood, L., and M. A. Whyte. "A palaeomagnetic and mineral magnetic study of the Speeton Shell Bed, North Yorkshire." Proceedings of the Yorkshire Geological Society 49, no. 4 (November 1993): 325–34. http://dx.doi.org/10.1144/pygs.49.4.325.

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39

Qizhong, Liang, Fang Wu, and Rob Van der Voo. "Palaeomagnetic Study on the Precambrian-Cambrian Boundary Candidate Stratotype Section at Meishucun, Yunnan." Acta Geologica Sinica - English Edition 4, no. 1 (May 29, 2009): 97–109. http://dx.doi.org/10.1111/j.1755-6724.1991.mp4001009.x.

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40

Taylor, G. K. "A palaeomagnetic study of two Precambrian-Cambrian dyke swarms from the Armorican Massif." Geological Society, London, Special Publications 51, no. 1 (1990): 69–80. http://dx.doi.org/10.1144/gsl.sp.1990.051.01.05.

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Fossen, Mickey C. Van, and Dennis V. Kent. "A Palaeomagnetic Study of 143 Ma Kimberlite Dikes In Central New York State." Geophysical Journal International 113, no. 1 (April 1993): 175–85. http://dx.doi.org/10.1111/j.1365-246x.1993.tb02538.x.

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42

Eggler, D. H., and E. E. Larson. "Palaeomagnetic Study of Dated Pre-Cambrian Rocks of the Front Range, Colorado-Wyoming." Geophysical Journal of the Royal Astronomical Society 14, no. 1-4 (January 26, 2010): 497–504. http://dx.doi.org/10.1111/j.1365-246x.1967.tb06269.x.

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43

Elming, S. A., P. Layer, and K. Ubieta. "A palaeomagnetic study and age determinations of Tertiary rocks in Nicaragua, Central America." Geophysical Journal International 147, no. 2 (November 2001): 294–309. http://dx.doi.org/10.1046/j.0956-540x.2001.01526.x.

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44

Mushayandebvu, M. F., D. L. Jones, and J. C. Briden. "A palaeomagnetic study of the Umvimeela Dyke, Zimbabwe: evidence for a Mesoproterozoic overprint." Precambrian Research 69, no. 1-4 (October 1994): 269–80. http://dx.doi.org/10.1016/0301-9268(94)90091-4.

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45

Sherwood, Graham J., and S. Basu Mallik. "A palaeomagnetic and rock magnetic study of the northern Rajmahal Volcanics, Bihar, India." Journal of Southeast Asian Earth Sciences 13, no. 2 (February 1996): 123–31. http://dx.doi.org/10.1016/0743-9547(96)00013-x.

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46

Hlavatskyi, D. V., V. N. Stepanchuk, D. M. Kuzina, Ie B. Poliachenko, V. V. Shpyra, T. V. Skarboviychuk, V. I. Yakukhno, and V. G. Bakhmutov. "Rock magnetic and palaeomagnetic studies of loess-palaesol sections — Lower Palaeolithic sites within the Southern Bug Valley (Medzhybizh, Holovchyntsi)." Geofizicheskiy Zhurnal 43, no. 1 (March 13, 2021): 3–37. http://dx.doi.org/10.24028/gzh.0203-3100.v43i1.2021.225539.

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Combined rock magnetic and palaeomagnetic studies of loess-soil sections — Lower Paleolithic sites in the valley of the Southern Bug (Medzhybizh, Holovchintsi) — have been performed for the first time in order to determine the suitability of these objects for palaeomagnetic study and the establishment of magnetostratigraphic markers. Investigated sections by rock magnetic characteristics are closest to the sections of the Volynian Upland, and refer to the intermediate «Chinese» type of formation of magnetic properties, with an admixture of the «Alaskan» mechanism. These sections are characterized by a low concentration of ferrimagnetic material, the destruction of the primary sedimentary magnetic texture, which makes them unsuitable for qualitative magnetostratigraphic studies. According to the data of magnetic-mineralogical analysis, the samples are subdivided into three groups: the first group includes samples with new formation at 300 °C, which is associated with iron hydroxides or the presence of organic matter; in the second group, the thermomagnetic curves are not informative, which makes it difficult to determine the minerals-carriers; in some samples, the magnetization carrier is magnetite (with defects or finely dispersed). A zone of normal polarity, probably the Brunhes chron, has been reliably determined in the upper part (G-S7S1 soil) of the Holovchyntsi section. In the lower part of the M-S4 soil unit (MIS 11) at Medzhybizh, the Unnamed geomagnetic event at 430 ky has been detected. The paleomagnetic veracity of the remaining investigated layers is questioned. The analogies for the archaeological assemblages from the lower layers of Medzhybizh-A and Holovchintsi-1 are seen in archaic industries of mode 1, which in southeastern Europe are dated back from 800 ky and older. However, reliable data on the Matuyama—Brunhes boundary and, correspondingly, data on the >780 ky age of any layers with artifacts in the Medzhybizh and Holovchintsi sections were not obtained by the palaeomagnetic studies.

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Gibert, J., Ll Gibert, A. Iglesias, and E. Maestro. "Two ‘Oldowan’ assemblages in the Plio-Pleistocene deposits of the Orce region, southeast Spain." Antiquity 72, no. 275 (March 1998): 17–25. http://dx.doi.org/10.1017/s0003598x00086233.

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Stone artefacts reported from the Orce region (Grenada, Spain) indicate a first human presence in western Europe as early as the Plio-Pleistocene boundary, making a ‘long chronology’ for European hominids against the claims for a briefer human presence. Excavations of Barranco León-5 and Fuentenueva-3a in 1995 have produced two groups of lithic artefacts of ‘Oldowan’ type, seen as the most ancient of western Europe by faunal associations and palaeomagnetic study.

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Idnurm, M., and C. A. Heinrich. "A palaeomagnetic study of hydrothermal activity and uranium mineralization at Mt Painter, South Australia." Australian Journal of Earth Sciences 40, no. 1 (February 1993): 87–101. http://dx.doi.org/10.1080/08120099308728065.

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Incoronato, A., D. H. Tarling, and G. Nardi. "Palaeomagnetic study of an allochthonous terraine: the Scisti Silicei Formation, Lagonegro Basin, southern Italy." Geophysical Journal International 83, no. 3 (December 1, 1985): 721–29. http://dx.doi.org/10.1111/j.1365-246x.1985.tb04334.x.

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50

Rey, D., P. Turner, and A. Yaliz. "Palaeomagnetic study and magnetostratigraphy of the Triassic Skagerrak Formation, Crawford Field, UK North Sea." Geological Society, London, Special Publications 73, no. 1 (1993): 399–420. http://dx.doi.org/10.1144/gsl.sp.1993.073.01.23.

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