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Academic literature on the topic 'Palaeomagnetic study'

Author: Grafiati

Published: 6 September 2023

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Journal articles on the topic "Palaeomagnetic study"

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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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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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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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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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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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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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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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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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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Dissertations / Theses on the topic "Palaeomagnetic study"

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Trench, A. "Palaeomagnetic studies in the Scottish paratectonic Caledonides." Thesis, University of Glasgow, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233168.

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Allerton, W. S. Q. "Palaeomagnetic and structural studies of the Troodos Ophiolite, Cyprus." Thesis, University of East Anglia, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381054.

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Darabi, Mohammad Hamedpour. "A palaeomagnetic study of the (Late Mesoproterozoic) Torridonian Supergroup, NW Scotland." Thesis, University of Liverpool, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250314.

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Mubroto, Bundan. "A palaeomagnetic study of the East and Southwest arms of Sulawesi, Indonesia." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329966.

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Hobson, Kate Elizabeth. "The pyroclastic deposits and eruption history of Ascension Island : a palaeomagnetic and volcanological study." Thesis, University of Oxford, 2001. http://ora.ox.ac.uk/objects/uuid:2607a9e5-8147-402a-adab-bab4bfe8372f.

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In this study, palaeomagnetic methods have been combined with field and volcanological techniques to identify, classify and correlate the pyroclastic deposits found on Ascension Island, South Atlantic, allowing them to be placed into a temporal and geographic framework. Pyroclastic material is abundant on the island and, in general, wellpreserved, making Ascension an ideal site to study the nature and distribution of the pyroclastic products of this type of composite volcano or stratovolcano. A better understanding of the nature and distribution of the products of past pyroclastic eruptions on Ascension should enhance our ability to assess volcanic hazard around stratovolcanoes world-wide. Field mapping and stratigraphic logging have revealed the presence of several major pyroclastic sequences on Ascension. These comprise extensive felsic (pumice) and mafic (scoria) lapilli deposits, two major and several minor exposures of welded material and numerous breccia deposits that exhibit great variation in juvenile/lithic content, matrix type and content and internal structure. Preliminary interpretations of the deposits were made in the field, based on features such as welding, grain shape and internal structures. However many of the deposits - particularly the breccia deposits - display ambiguous field characteristics that could be attributed to pyroclastic or epiclastic processes and their origins could not therefore be determined from field characteristics alone. [See pdf for continuation of abstract].

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Kisilevsky, David K. "A palaeomagnetic study of the Lewis thrust sheet, southeast Canadian Rocky Mountains, structural and tectonic implications." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0002/MQ28212.pdf.

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Staiger, Martin. "Palaeomagnetic and structural investigations in unbeknown areas of Central Tibet a study on block rotations and crustal shortening /." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=970411006.

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Roberts, Artal Laura. "A palaeomagnetic study of 3.5 to 3.2 billion year old rocks from the Barberton Greenstone Belt, South Africa." Thesis, University of Liverpool, 2014. http://livrepository.liverpool.ac.uk/2014439/.

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A palaeomagnetic study of some of the best preserved Palaeoarchaean (3.2 -3.6 Ga) rock successions in the world – the Barberton Greenstone Belt, South Africa – has been carried out in order to shed light on Early Earth processes. The aim is to improve the understanding of the long term evolution of the Earth and the surface conditions under which the first forms of life originated through using palaeomagnetic records. The study follows on from work by Layer et al., (1998), Yoshihara & Hamano (2004), Usui et al., (2009), Tarduno et al., (2010) and Biggin et al., (2011) that indicate that rocks from the Barberton Greenstone Belt have the potential to record a near-primary direction of remanence and a reversing geomagnetic field at ca. 3.5 Ga. The rocks of the Barberton Greenstone Belt are excellently preserved and have only been subjected to low grade metamorphism (greenschist facies), making them good candidates for palaeomagnetic studies. Here, new data obtained from three Onverwacht Group Formations and from the Nelshoogte Pluton are presented. The reliability of the new palaeomagnetic data is affected by the complex history and the age of the rocks but no more so than any other published study of rocks of this age. The Noisy Complex and the Nelshoogte Pluton are affected by lightning induced isothermal remanent magnetisations (IRMs) which result in poor quality results. Nevertheless, two new poles, produced by combining the new findings with previously published data, are calculated for the Komati and Hooggenoeg Formations. The new Komati pole shows improved clustering when compared to previous studies. Whilst the data of the Hooggenoeg Formation are encouraging, the results are ambiguous and open to interpretation. When combined with the results of Biggin et al., (2011) they exhibit considerably improved clustering when the directions are corrected for the tectonic deformation resulting in the formation of the Onverwacht Fold, dated at 3.23 Ga. The new results presented here support the findings of previous palaeomagnetic studies of the Barberton Greenstone Belt and support the existence of a stable geomagnetic field at ca. 3.5 Ga. The results presented here support the findings of Biggin et al., (2011) of moderate latitudinal plate motion during this time and do not rule out the hypothesis that the Pilbara Craton (Western Australia) and the Kaapval Craton (South Africa) were conjoined in the Palaeoarchaean.

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Randall, Darren Edward. "A palaeomagnetic study of crustal rotations and their relationship to the tectonics of the Atacama and Domeyko fault systems, northern Chile." Thesis, University of Plymouth, 1996. http://hdl.handle.net/10026.1/1728.

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A total of 178 sites have been collected for palaeomagnetic analysis from within two strike-slip fault systems in northern Chile (25.4°S - 26.4°S); the Atacama Fault System in the Coastal Cordillera, and the Domeyko Fault System in the Andean pre-Cordillera. In the Coastal Cordillera, analysis of Middle Jurassic lavas (La Negra Formation) and Middle Jurassic to Early Cretaceous dyke swarms reveal a consistent clockwise rotation of approximately 42°. The remanence from the La Negra Formation passes both fold and reversal tests and is interpreted as a pre-folding remanence. Four of the five dyke swarms have mixed polarity, suggesting that they too carry a primary or very early remanence. The clockwise rotation of the area is interpreted as occurring due to a domino-type mechanism where the blocks are bounded by sinistral faults operating in a crustal scale strike-slip duplex structure. The rotation is the result of sinistral transpression during the middle Cretaceous as a result of the Peruvian Orogeny leading to abandonment of the Jurassic-Early Cretaceous magmatic arc in the Coastal Cordillera and its subsequent eastward migration. The Domeyko Fault System (DFS) comprises the Domeyko Fault Zone (DFZ), and a series of subsidiary faults to the east which define two distinct but slightly overlapping domains: a fold-and-thrust belt in the north and a domain o f sinistral strike-slip faults in the south. Samples were collected from the volcanic rocks of the Sierra Fraga Formation (Middle Jurassic) west of the DFZ, and from the lavas of the Quebrada Vicunita Formation (Late Jurassic) and Cerro Valiente Formation (Palaeocene) from both domains of the DFS. Also sampled in the southern domain, and in a small area between the two domains were sandstones o f the Quebrada Monardes Formation (Early Cretaceous). All of the volcanic units have been remagnetised and no tectonic interpretation is made from them. The sandstones in the southern domain record a clockwise rotation of approximately 24°. This is interpreted as being due to compression across the DFS causing the sinistral strike-slip faults, and the blocks between them to rotate clockwise towards the major tectonic structure, the DFS. The sandstones in the central area between the two domains record an anticlockwise rotation of approximately 28°. This is explained by small-scale rotation of thrust sheets or slip on minor dextral strike-slip faults. The deformation and rotation in the pre-Cordillera occurred in response to the Incaic Orogeny during the Miocene-Oligocene.

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Lappe, Sophie-Charlotte Luise Leonore. "Palaeomagnetism of extraterrestrial materials on the nm-μm scale : a case study using synthetic dusty olivine." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608197.

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Books on the topic "Palaeomagnetic study"

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Collinson, D. W., S. K. Runcorn, and K. M. Creer. Methods in Palaeomagnetism: Proceedings of the NATO Advanced Study Institute on Palaeomagnetic Methods, Held in the Physics Department of the University of Newcastle upon Tyne, April 1-10 1964. Elsevier, 2013.

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Book chapters on the topic "Palaeomagnetic study"

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Dagley, P., and J. D. A. Piper. "The Application of Palaeomagnetism to Extensional Tectonics: A Palaeomagnetic Study of the Parker District, Basin and Range Province, Arizona." In Paleomagnetic Rotations and Continental Deformation, 293–311. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0869-7_18.

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"Techniques for the Study of Magnetic Components in Rocks." In Methods in Palaeomagnetism, 483. Elsevier, 2013. http://dx.doi.org/10.1016/b978-1-4832-2894-5.50083-5.

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