Paleomagnetism of the Siberian traps: New data and a new overall 250 Ma pole for Siberia

Павлов, В. Е.; Courtillot, Vincent; Bazhenov, Mikhail L.; Veselovsky, R.V.

doi:10.1016/j.tecto.2007.07.005

Cited by 51 publications

(15 citation statements)

References 33 publications

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“…Our hysteresis data for clasts from K08-10.3 and K08-7.11, including the ratio of saturation remanence to saturation magnetization (M rs /M s ) and the ratio of remanent coercive force to ordinary coercive force (H cr /H c ) for K08-7.11 (GSA Data Repository Fig. A2 [see footnote 1]), indicate that as found in previous studies Lind et al, 1994;Pavlov et al, 2007), the ferromagnetic minerals are predominantly in the pseudosingle-domain size range (Dunlop, 1990). During our optical and electron microprobe investigations, we did not identify any ferromagnetic minerals, consistent with a relatively fi ne (pseudo-single-domain) grain size.…”

Section: Paleomagnetismsupporting

confidence: 86%

“…Previous paleomagnetic studies of the Siberian Traps have identifi ed magnetite and titanomagnetite as the primary carriers of magnetic remanence, with grains predominantly in the pseudo-single-domain size range Lind et al, 1994;Pavlov et al, 2007). The magnetization components we identifi ed provide additional context for the mineralogy of our samples (these components are described in more detail in the next paragraph).…”

Section: Paleomagnetismmentioning

confidence: 79%

“…Recent paleomagnetic studies of the Siberian Traps have focused on characterizing the magnetostratigraphy Pavlov et al, 2011;Veselovskiy et al, 2012), the implications of secular variation of the magnetic fi eld for eruption time scales (Pavlov et al, 2011), and geomagnetic fi eld paleointensities and the paleolatitude of Siberia (Veselovsky et al, 2003;Heunemann et al, 2004;Pavlov et al, 2007). Here, we use paleomagnetic studies to constrain emplacement temperatures of volcaniclastic rocks using techniques pioneered by Aramaki and Akimoto (1957) and Hoblitt and Kellogg (1979) as refi ned by Kent et al (1981).…”

Section: Methods and Geologic Backgroundmentioning

confidence: 99%

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Siberian Traps volcaniclastic rocks and the role of magma-water interactions

Black

Weiss

Elkins-Tanton

et al. 2015

Geological Society of America Bulletin

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The Siberian Traps are one of the largest known continental fl ood basalt provinces and may be causally related to the end-Permian mass extinction. In some areas, a large fraction of the Siberian Traps vol canic sequence consists of mafi c volcaniclastic rocks. Here, we synthesize paleomagnetic, petrographic, and fi eld data to assess the likely origins of these volcaniclastic rocks and their significance for the overall environmental impact of the eruptions. We argue that magmawater interactions, including both lava-water inter actions and phreatomagmatic explosions in vents, were important components of Siberian Traps magmatism. Phreatomagmatic episodes may have generated tall water-rich eruption columns, simultaneously promoting removal of highly soluble volcanic gases such as HCl and potentially delivering additional sulfur to the upper atmosphere.

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Section: Paleomagnetismsupporting

confidence: 86%

Section: Paleomagnetismmentioning

confidence: 79%

Section: Methods and Geologic Backgroundmentioning

confidence: 99%

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Siberian Traps volcaniclastic rocks and the role of magma-water interactions

Black

Weiss

Elkins-Tanton

et al. 2015

Geological Society of America Bulletin

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“…Previously, many researchers considered Siberia to have been integrated with the European plate since ~250 Ma (Besse & Courtillot, ; Pavlov et al, ; Torsvik et al, ; Van der Voo et al, ), and thus a synthetic APWP during the Mesozoic was constructed for Europe–Siberia (Besse & Courtillot, ; Schettino & Scotese, ; Torsvik et al, ). However, Metelkin et al () reported some new Mesozoic key poles for Siberia, which strongly demonstrated that there was relative tectonic rotation between Siberia and Europe along a large‐scale strike‐slip tectonic system during the Late Mesozoic.…”

Section: Discussionmentioning

confidence: 99%

New Late Jurassic to Early Cretaceous Paleomagnetic Results From North China and Southern Mongolia and Their Implications for the Evolution of the Mongol‐Okhotsk Suture

Ren

Zhang

et al. 2018

JGR Solid Earth

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To better constrain the evolution of the Mongol‐Okhotsk suture, we carried out new paleomagnetic studies on Sharilyn Formation (~155 Ma) and Tsagantsav Formation (~130 Ma) in southern Mongolia, Amuria Block (AMU), and Tuchengzi Formation (~140 Ma) and Dadianzi/Yixian Formation (~130 Ma) in the Yanshan belt, North China Block (NCB). A total of 719 collected samples (from 100 sites) were subjected to stepwise thermal demagnetization. After a low‐temperature component of viscous magnetic remanence acquired in the recent field was removed, the stable high‐temperature components were isolated from most samples. The high‐temperature components from each rock unit passed a fold test and a reversal test, indicating their primary origins. The corresponding paleomagnetic poles were thus calculated. For AMU, the ~155 Ma pole is at 74.7°N/232.5°E (A95 = 3.7°), the ~130 Ma pole at 74.6°N/194.7°E (A95 = 2.9°); for the NCB, the ~140 Ma pole is at 82.7°N/208.6°E (A95 = 4.3°), the ~130 Ma pole at 80.5°N/197.4°E (A95 = 2.3°). By combining our new results with the published data, we refined the 155–100 Ma segment of the apparent polar wander paths for AMU and NCB, which can demonstrate that these two blocks have been tectonically coherent (AMU‐NCB) during 155–100 Ma. Comparison of the apparent polar wander paths, however, revealed a latitudinal plate convergence of 14.3° ± 6.9° and ~19.0° relative rotation between Siberia and the AMU‐NCB after ~155 Ma. Large‐scale latitudinal convergence likely ceased by ~130 Ma, although some relative rotation between them continued along the Mongol‐Okhotsk suture until ~100 Ma.

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“…The Permian poles from Siberia are statistically grouped [ Kravchinsky et al ., ; Veselovsky et al ., ; Pavlov et al ., ], except an outlier obtained from mafic dykes (Figure b) [ Pisarevsky et al ., ]. These poles are far away from all other poles of NCB, IMB, and MOB, indicating that significantly latitudinal movements have occurred since Permian between Siberia and other blocks.…”

Section: Discussionmentioning

confidence: 99%

Did the Paleo‐Asian Ocean between North China Block and Mongolia Block exist during the late Paleozoic? First paleomagnetic evidence from central‐eastern Inner Mongolia, China

et al. 2013

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[1] The tectonic evolution of the Paleo-Asian Ocean between the North China Block (NCB) and the Mongolia Block (MOB) is a contentious issue, and geodynamic models remain speculative. In an effort to puzzle out this controversy, a paleomagnetic study was carried out on the Silurian to Permian formations in central-eastern Inner Mongolia (China). More than 680 sedimentary and volcanic samples were collected from 86 sites. We have established titanium-poor magnetite and hematite as the principal magnetic carriers. Anisotropy of the magnetic susceptibility measurements demonstrate negligible deformation of the majority of study rocks with sedimentary fabrics. From primary magnetizations, a Late Devonian and a Permian pole are calculated for Inner Mongolia Block (IMB) at l = 46.8 N, j = 349.1 E, dp = 14.6, dm = 27.3 with N = 3 and l = 48.7 N, j = 3.7 E, dp = 5.2 , dm = 9.1 with N = 6, respectively. Two stages of secondary magnetization are also identified probably due to Early Permian and Early Cretaceous magmatic events. As preliminary results, the comparison of our new paleomagnetic poles with available data from NCB, MOB, and Siberia indicates that (1) the paleolatitudes of IMB, NCB, and MOB are consistent between Late Devonian and Permian, suggesting pre-Late Devonian closure of the Paleo-Asian Ocean and further evaluation of these three blocks as a single entity and (2) post-Permian intracontinental deformation was significant and characterized by block rotations, which are due to strike-slip faulting within the welded NCB-IMB-MOB block.

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Paleomagnetism of the Siberian traps: New data and a new overall 250 Ma pole for Siberia

Cited by 51 publications

References 33 publications

Siberian Traps volcaniclastic rocks and the role of magma-water interactions

Siberian Traps volcaniclastic rocks and the role of magma-water interactions

New Late Jurassic to Early Cretaceous Paleomagnetic Results From North China and Southern Mongolia and Their Implications for the Evolution of the Mongol‐Okhotsk Suture

Did the Paleo‐Asian Ocean between North China Block and Mongolia Block exist during the late Paleozoic? First paleomagnetic evidence from central‐eastern Inner Mongolia, China

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