Late Cretaceous paleomagnetic results from northeast Asian continental margin: The Sikhote Alin Mountain Range, eastern Russia

Uno, Koji; Otofuji, Yo–ichiro; Matsuda, T.; Kuniko, Yoshiki; Enami, Ryo; Kulinich, R; Zimin, Petr S.; Matunin, Anatoly P.; Sakhno, V. G.

doi:10.1029/1999gl900034

Cited by 14 publications

(8 citation statements)

References 10 publications

(5 reference statements)

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“…Randall 1998); comprising small‐scale in situ rotation and large‐scale rigid rotation. Uno et al (1999) attribute the counterclockwise rotation of the study areas in Sikhote Alin to the former category. Sinistral strike‐slip movement on the Central Sikhote Alin Fault is considered to be responsible for the in situ rotation of blocks comprising Sikhote Alin.…”

Section: Discussionmentioning

confidence: 99%

“…Combining with palaeomagnetic directions reported previously (Uno et al 1999), the total number of sampling sites in the Kisin group is increased to 43. The 43 sites are from nine areas extending from 43.36 • N (SA50) to 46.38 • N (SA105) (Fig.…”

Section: Palaeomagnetic Directionsmentioning

confidence: 91%

“…We re‐examined demagnetization behaviour of specimens from six sites (SA07, SA08, SA48, SA57, SA63 and SA85) from the Terney, Kavalerova and Scherbakovka areas in the southern part of Sikhote Alin (Fig. 3), because Uno et al (1999) suggest that these sites acquired secondary remanent magnetization during subsequent igneous activity. Four‐component magnetization is observed in specimens at SA57 and SA63.…”

Section: Palaeomagnetismmentioning

confidence: 99%

“…An abrupt decrease of remanent intensity between 300 and 350 °C in specimens of SA85 is indicative of the presence of pyrrhotite or maghemite, which are probably connected with ore deposition processes in Sikhote Alin regions. Because welded tuffs in these rocks seem to have been subjected to a secondary magnetization process, we reject data from the above six sites for the same reasons as Uno et al (1999).…”

Section: Palaeomagnetismmentioning

confidence: 99%

“…In this study we present palaeomagnetic results from Late Cretaceous welded tuffs from the Sikhote Alin area. We have extended our study from areas previously covered by Uno et al (1999) up to 46.38°N latitude in order to understand the tectonics of the main part of the Sikhote Alin after Late Cretaceous times and provide more reliable data than those published in previous work on lavas from this region (Bretstein 1988).…”

Section: Introductionmentioning

confidence: 99%

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Late Cretaceous palaeomagnetic results from Sikhote Alin, far eastern Russia: tectonic implications for the eastern margin of the Mongolia Block

Otofuji

Matsuda

Enami

et al. 2003

Geophysical Journal International

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SUMMARY We present palaeomagnetic results from Late Cretaceous welded tuffs in the Kisin Group (Monastirskaya Suite, Primorskaya Series) collected at 27 sites from the Sikhote Alin mountain range. A high unblocking temperature magnetization component (>590°C) was isolated after stepwise thermal demagnetization from 25 sites. Combined with previously reported data, reliable characteristic remanence directions from 39 sites are distributed at eight areas ranging from 46.7°N, 138.1°E to 43.4 °N, 134.8°E in the Sikhote Alin Block. The bedding‐tilt test is positive for two area mean directions and inconclusive for the remaining six areas. The data set for all 39 sites reveals a positive bedding‐tilt test at the 99 per cent confidence level, and their tilt‐corrected mean direction is D= 335.6°, I= 54.4° (α95= 8.5°), corresponding to a palaeopole at 71.5°N, 38.9°E with A95= 9.9°. This westerly direction is ascertained through the tilt‐corrected mean direction (D= 331.1°, I= 53.5°, α95= 8.5°) based on the 25 data selected from four areas (Kema river, Terney, Plastun and Moryak‐Rybolov) where each data set passes the positive bedding‐tilt test or reveals an increase in the precision parameter after tilt correction. Palaeomagnetic declination indicates that the Sikhote Alin Block has rotated counterclockwise by 41°± 16° with respect to the Eurasian continent between Late Cretaceous times and 53–50 Ma. Compared with palaeomagnetic data from the surrounding regions, we find that the rotation recorded in Sikhote Alin extends westward into the interior of the Mongolia Block. The eastern margin of the Asian continent experienced both counterclockwise rotation of the eastern part of the Mongolia Block and clockwise rotation of the eastern part of the North China Block over the Cretaceous. We interpret these data in terms of a strong net horizontal force towards the ocean side, acting on the lithosphere at the eastern margin of the Asian continent between the Late Cretaceous and 53–50 Ma. Intermittently occurring upwellings of mantle and associated horizontal flows may have played an important role in producing the net horizontal force acting on the continental block during Late Cretaceous times.

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Section: Discussionmentioning

confidence: 99%

Section: Palaeomagnetic Directionsmentioning

confidence: 91%

Section: Palaeomagnetismmentioning

confidence: 99%

Section: Palaeomagnetismmentioning

confidence: 99%