Paleomagnetic data of the Siberian Mesoproterozoic rocks (Udzha Uplift, Northern Siberia)

2020 ◽  
Author(s):  
Aleksandr Pasenko ◽  
Aleksandr Savelev ◽  
Sergey Malyshev
Keyword(s):  
Siberian Platform ◽  
Paleomagnetic Data ◽  
Russian Science ◽  
Polar Wander ◽  
Late Precambrian ◽  
Apparent Polar Wander Path ◽  
The Earth ◽  
Isotope Studies ◽  
Paleomagnetic Poles ◽  
Olenek Uplift

<p>In spite of the fact, that during the last two decades some number of new paleomagnetic poles, more or less meeting the modern standards of quality [Van der Voo, 1993], have been obtained for Mesoproterozoic of Siberia [Evans et al., 2016]. The problem of the Precambrian segment of the apparent polar wander path (APWP) for Siberia, rests still to be far from its solution.</p><p>The latter, obviously, hampers the elaboration of Precambrian paleogeographic reconstructions, solution of numerous other important tasks of the Earth Sciences.</p><p>The Late Precambrian key section of the Udzha Uplift seemed to be one of the most promising object to elaborate the Mesoproterozoic segment of APWP of the Siberian platform. Until recently, the rocks composing this section have been considered to be of the Mesoproterozoic and Vendian age.</p><p>As a result of isotope studies in recent years, the age of formations of the Udzha Uplift has been significantly increased (1386±30 Ma, apatite, U-Pb, [Malyshev et al., 2018]). In particular, age of the Udzha Fm, which forms the uppermost part of the Udzha riphean sequence is considered currently to be Mesoproterosoic. On the base of our new paleomagnetic data this formation has been formed about the same time as the Khaypakh Fm from the Olenek Uplift (NE Siberia), whose Mesoproterozoic age has been established earlier from independent isotopic data [Zaitseva et al., 2017].</p><p>During last several years we have carried out the paleomagnetic studies of Late Precambrian rocks of the Udzha Uplift including the Mesoproterozoic Udzha and Unguokhtakh formations as well as intrusions representing two Mesoproterozoic magmatic events.</p><p>In this abstract we present new paleomagnetic poles for the Mesoproterosoic rocks (1500 Ma, ca.1400 Ma, 1385 Ma) of the Siberian platform.</p><p>These paleomagnetic poles significantly complement the Mesoproterozoic segment of APWP of the Siberian Platform.</p><p><em>The studies were supported by the Russian Science Foundation project № 19-77-10048.</em></p>

Geochronological and paleomagnetic studies of small carbonatite intrusions of the Udzha uplift (Tomtor massif, northeast of the Siberian platform)

2021 ◽  
Author(s):  
Aleksandr Pasenko ◽  
Ivanov Alexey ◽  
Malyshev Sergey ◽  
Travin Alexey
Keyword(s):  
Siberian Platform ◽  
Conclusive Evidence ◽  
Snowball Earth ◽  
Paleomagnetic Data ◽  
Russian Science ◽  
Virtual Geomagnetic Pole ◽  
River Bank ◽  
High Temperature Component ◽  
Geomagnetic Pole ◽  
Temperature Component

<p>Paleomagnetic data obtained from Neoproterozoic glacial and glacier-associated sedimentary rocks indicate that they were formed at near equatorial latitudes. Based on these data, the Snowball Earth hypothesis was proposed [Kirschvink, 1992]. According to this hypothesis, during the Neoproterozoic glaciations, the entire planet (including the oceans) was completely covered with ice. Although evidence is emerging that does not support this hypothesis, there is still no conclusive evidence that it is not true [Sansjofre et al., 2011].</p><p>It is worth noting that the Snowball earth hypothesis is based on paleomagnetic data. At the same time, the available paleomagnetic data for the Neoproterozoic-Early Cambrian [Meert, Van der Voo, 2001; Shatsillo et al, 2005; Abrajevitch, Van der Voo, 2010; Pavlov et al., 2018] difficult to interpret in terms of the Geocentric Axial Dipole hypothesis. This imposes serious restrictions on the possibility of correctly constructing paleomagnetic reconstructions.</p><p>For the development and testing of a model of the geomagnetic field of the Neoproterozoic, it is necessary to obtain a lot of high-quality paleomagnetic data. Data from well-dated magmatic bodies are especially valuable.</p><p>Within the framework of this work, we obtained paleomagnetic data from three carbonatite dikes (7 to 30 cm thickness) exposed in the Udzha river bank on the Udzha uplift in the northeastern part of the Siberian platform. These dikes are associated with the large alkaline Tomtor massif located 15 km to the west. Ar/Ar dating of phlogopite megacrysts gives an intrusion age of the dikes of 706.1±8.8 Ma. Coordinates of the virtual geomagnetic pole, calculated from the direction of the high-temperature component of magnetization: Φ=-20.7°; Λ=88.6°; Α95=3.4°.</p><p>Our report will present preliminary interpretation of these data, as well as their comparison with paleomagnetic data on close-aged objects in Siberia.</p><p><em>The research was supported by the Russian Science Foundation grant (19-77-10048).</em></p><p>References:</p>

Paleomagnetism of the Chuar Group and evaluation of the late Tonian Laurentian apparent polar wander path with implications for the makeup and breakup of Rodinia

2019 ◽  
Vol 132 (3-4) ◽  
pp. 710-738 ◽  
Author(s):  
Athena Eyster ◽  
Benjamin P. Weiss ◽  
Karl Karlstrom ◽  
Francis A. Macdonald
Keyword(s):  
Grand Canyon ◽  
Quality Criteria ◽  
Paleomagnetic Data ◽  
Geochronological Data ◽  
Data Set ◽  
Polar Wander ◽  
Apparent Polar Wander Path ◽  
Robust Tests ◽  
Laurentian Margin ◽  
Global Data

AbstractPaleogeographic models commonly assume that the supercontinent Rodinia was long-lived, with a static geometry involving Mesoproterozoic links that developed during assembly and persisted until Neoproterozoic rifting. However, Rodinian paleogeography and dynamics of continental separation around its centerpiece, Laurentia, remain poorly constrained. On the western Laurentian margin, geological and geochronological data suggest that breakup did not occur until after 720 Ma. Thus, late Tonian (ca. 780–720 Ma) paleomagnetic data are critical for reconstructing paleogeography prior to dispersal and assessing the proposed stasis of Rodinia. Here, we report new paleomagnetic data from the late Tonian Chuar Group in the Grand Canyon, Arizona. We combined this new data set with reanalyzed existing data to obtain a new paleopole preserved in hematite, the reliability of which is supported by six of the seven (Q1–Q6) Van der Voo reliability quality criteria. In addition, we identified pervasive mid- to high-temperature overprints. This new paleomagnetic pole was incorporated with recent high-precision geochronological data and existing paleomagnetic data to present a new late Tonian Laurentian apparent polar wander path (APWP). Having examined the paleomagnetic data of other cratons, global reconstructions for 775 Ma, 751 Ma, and 716 Ma are presented. These reconstructions are consistent with Australia located near the present southern margin of Laurentia. However, a stringent analysis of the global data set does not support a good match between any major craton and the rifted conjugate margin to western Laurentia. Breakup on the western Laurentian margin may have involved rifting of a continental fragment or a craton with uncertainties in its late Tonian geochronologic and paleomagnetic constraints. Our revised Laurentian APWP will allow for more robust tests of paleogeography and evaluation of the proposed supercontinent Rodinia.

scholarly journals Paleomagnetism of Ordovician-Silurian volcanics of the western slope of the Southern Urals

2019 ◽  
Vol 489 (4) ◽  
pp. 379-383
Author(s):  
I. V. Golovanova ◽  
K. N. Danukalov ◽  
V. N. Puchkov ◽  
N. D. Sergeeva ◽  
R. Yu. Sal’manova
Keyword(s):  
Southern Urals ◽  
Late Ordovician ◽  
Paleomagnetic Data ◽  
Western Slope ◽  
Geological Data ◽  
Fold Belt ◽  
The Southern Urals ◽  
Polar Wander ◽  
Apparent Polar Wander Path ◽  
High Degree

The paper presents new paleomagnetic data on dated Ordovician-Silurian volcanics from four sections in the western frame of the Taratash massif in the Southern Urals. Geological data indicate that the region under study has been part of the paleocontinent Baltica since the beginning of Mesoproterozoic. Paleomagnetic data from studies of the rocks of the most western part of the Ural fold belt did not reveal local and regional rotations with respect to the Baltica. Consequently, the pole obtained can be extrapolated to the entire platform. The presented result has a fairly high degree of reliability and can clarify the part of apparent polar wander path (APWP) for the paleocontinent Baltica on the Late Ordovician - Early Silurian segment, where reliable paleomagnetic data are not available, and can be used for paleoreconstructions.

Magnetostratigraphy of lower Cambrian strata from the Siberian Platform: a palaeomagnetic pole and a preliminary polarity time-scale

1984 ◽  
Vol 121 (3) ◽  
pp. 189-203 ◽  
Author(s):  
Joseph L. Kirschvink ◽  
A. Yu. Rozanov
Keyword(s):  
Siberian Platform ◽  
Time Scale ◽  
Lower Cambrian ◽  
Early Cambrian ◽  
Polar Wander ◽  
Lena River ◽  
Apparent Polar Wander Path ◽  
Geographical Position ◽  
Geomagnetic Polarity ◽  
Geomagnetic Polarity Time Scale

AbstractFour sedimentary sections seen in continuous exposures along the Lena River on the Siberian Platform in Yakutia contain a record of the geomagnetic field during the Tommotian and Atdabanian stages of Early Cambrian time. The direction of the stable remanent magnetization indicates that the Siberian platform was located on the equator, and the corresponding palaeomagnetic pole provides a well-dated extension of the Siberian apparent polar wander path. A belt of archaeocyathid bioherms which separates two major facies zones in the lower Cambrian was positioned on and aligned more or less parallel with the palaeoequator. The geographical position of this belt appears to have tracked the southward motion of the Siberian platform during post-Tommotian time. These palaeomagnetic results combined with the extensive biostratigraphy of the Siberian Platform provide a provisional geomagnetic polarity time scale for this part of Early Cambrian time. Comparison of these results with data of similar age from Central Australia suggests that strata of Tommotian and lower Atdabanian age are not present in the Amadeus Basin of Australia.

New paleomagnetic results obtained in Upper Cretaceous-Paleocene detritic deposits of the North Iberian Meseta

2021 ◽  
Author(s):  
Juan José Villalaín ◽  
Pablo Calvín ◽  
Puy Ayarza ◽  
Ruth Soto ◽  
Manuel Calvo
Keyword(s):  
Upper Cretaceous ◽  
Magnetic Anomalies ◽  
Ocean Floor ◽  
Paleomagnetic Data ◽  
Necessary Condition ◽  
Western Tethys ◽  
The North ◽  
Apparent Polar Wander Path ◽  
Kinematic Evolution ◽  
Paleomagnetic Poles

<p>The Iberian microplate and its evolution during the Mesozoic have been in-vogue topics in the field of Geodynamics, because of its location between two of the major tectonic plates, its interaction with both of them, and its significance in relation with the evolution of the western Tethys domain. Geodynamic models of Mesozoic Iberian evolution are based upon the knowledge of the kinematics of the microplate obtained from the ocean floor magnetic anomalies and particularly its apparent polar wander path (APWP) defined by existing paleomagnetic data. In this sense, the most important feature is the anticlockwise 30º-40º rotation that Iberia underwent during the Cretaceous. Nevertheless, there are still uncertainties about the chronology of this movement due to the poor definition of oceanic magnetic anomalies and the scarcity of high-quality paleomagnetic data in the continent. According to recent works, existing paleomagnetic poles are contradictory and inconsistent with the global apparent wander path (GAPWP) and ocean floor anomalies. This is due to the widespread presence of remagnetizations in the Mesozoic basins within Iberia.</p><p>To address this question we are starting to develop a new project that aims to obtain new paleomagnetic data from unexplored geological units meeting the necessary condition to obtain new Cretaceous paleomagnetic poles representative of the Iberian plate. In this talk we show new paleomagnetic data from detritic deposits with siliceous cement located at the Duero basin (North Iberian Meseta) ascribed to the upper Cretaceous-Paleocene (Areniscas de Salamanca Formation). A stable paleomagnetic component carried by hematite, showing normal and reversed polarities has been isolated. A stable paleomagnetic component carried by hematite, showing normal and reversed polarities has been isolated. We discuss the primary character of this magnetization in terms of inferring the age of this unit in the frame of the kinematic evolution of the plate.  </p>

scholarly journals New Late Permian paleomagnetic data from Argentina: Refinement of the apparent polar wander path of Gondwana

2011 ◽  
Vol 12 (7) ◽  
pp. n/a-n/a ◽  
Author(s):  
Mathew Domeier ◽  
Rob Van der Voo ◽  
Eric Tohver ◽  
Renata N. Tomezzoli ◽  
Haroldo Vizan ◽  
...  
Keyword(s):  
Paleomagnetic Data ◽  
Late Permian ◽  
Polar Wander ◽  
Apparent Polar Wander Path
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