Paleomagnetic study of western Tibet: deformation of a narrow zone along the Indus Zangbo suture between India and Asia

Otofuji, Yo–ichiro; Funahara, Shoubu; Matsuo, Junji; Murata, Fumiyuki; Nishiyama, Takashi; Zheng, X.; Yaskawa, Katsumi

doi:10.1016/0012-821x(89)90055-1

Cited by 32 publications

(10 citation statements)

References 28 publications

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“…2a), a significant amount of CCW paleomagnetic rotation is obtained from an area along the Yarlung Zangbo Suture Zone; although the same cannot be observed in the present-day rotational features, suggesting an instantaneous and intense tectonic activity along this suture zone in the past. Although, a domino style deformation as a result of India-Asia collision has been postulated by paleomagnetic investigations for narrow zone between the Asian and the Indian Continents (Otofuji et al, 1989), additional reliable paleomagnetic data are required to discuss the origin of CCW rotation in the southern part of the Tibetan Plateau.…”

Section: Ccw Rotation In the Southern Part Of The Tibetan Plateaumentioning

confidence: 99%

“…On the other hand, record of older (post-collision) deformational events is available through paleomagnetic declination data. Following the initial results (Otofuji et al, 1989; of CW rotation from Markam area of the Qiangtang Block (located towards north from the eastern Himalayan syntaxis), more than 100 paleomagnetic data sets have been reported from the Cretaceous and Paleogene rocks of this region. These multi-age paleomagnetic data sets provide an opportunity to describe rotational aspects of East Asian terranes (particularly around eastern Himalayan syntaxis) in more detail.…”

Section: Introductionmentioning

confidence: 99%

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Paleomagnetic versus GPS determined tectonic rotation around eastern Himalayan syntaxis in East Asia

Otofuji

Yokoyama

Kitada

et al. 2010

Journal of Asian Earth Sciences

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Section: Ccw Rotation In the Southern Part Of The Tibetan Plateaumentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Paleomagnetic versus GPS determined tectonic rotation around eastern Himalayan syntaxis in East Asia

Otofuji

Yokoyama

Kitada

et al. 2010

Journal of Asian Earth Sciences

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“…Only the studies by Achache et al [1984] and Otofuji et al [1991] appear reliable, satisfying several of the key acceptance criteria proposed by Van der Voo [1990] and being listed on the global paleomagnetic database (http://www.ngu.no/dragon/Palmag/paleomag.htm). Other works have been published [ Westphal et al , 1983; Otofuji et al , 1989; Zhou et al , 1990; Dong et al , 1991] but cannot be reliably used for plate modeling. The results from the first study were discarded because only two sites, 3 and 6, yielded clustered characteristic magnetization directions, but the angular separation of the means was 43.4°.…”

Section: Plate Tectonic Considerationsmentioning

confidence: 99%

When and where did India and Asia collide?

Aitchison¹,

Ali²,

Davis³

2007

J. Geophys. Res.

793

565

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[1] Timing of the collision between India and Asia is the key boundary condition in all models for the evolution of the Himalaya-Tibetan orogenic system. Thus it profoundly affects the interpretation of the rates of a multitude of associated geological processes ranging from Tibetan Plateau uplift through continental extrusion across eastern Asia, as well as our understanding of global climate change during the Cenozoic. Although an abrupt slowdown in the rate of convergence between India and Asia around 55 Ma is widely regarded as indicating the beginning of the collision, most of the effects attributed to this major tectonic episode do not occur until more than 20 Ma later. Refined estimates of the relative positions of India and Asia indicate that they were not close enough to one another to have collided at 55 Ma. On the basis of new field evidence from Tibet and a reassessment of published data we suggest that continent-continent collision began around the Eocene/Oligocene boundary ($34 Ma) and propose an alternative explanation for events at 55 Ma.

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“…Xu et al 1987) is probably responsible for a large counter-clockwise rotation. This phenomenon can be compared with a 50 km zone across the Indus-Zangbo Suture, where a collision between India and Asia has resulted in more than 80 • counter-clockwise rotation (Pozzi et al 1984;Otofuji et al 1989Otofuji et al , 1991. Adjacent regions on both side of the collisional boundary (intercontinental scale) provide a mechanical buffer zone, where tectonic related stresses can possibly be developed.…”

Section: Deformation Near the Tan Lu Faultmentioning

confidence: 99%

Regional deformational features of the South China Block inferred from Middle Triassic palaeomagnetic data

Yang²,

Sun

et al. 2005

Geophysical Journal International

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S U M M A R YMiddle Triassic red-purple sandstones were sampled at four localities in the northeastern part of the South China Block (SCB) to detect regional deformational features. Most of the samples gave a characteristic remanent magnetization with unblocking temperatures up to 680 • C. The primary nature of this magnetization was ascertained by a positive fold test and a reversal test. The tilt-corrected mean direction from the Yueshan area (30.6 • N, 116.8 • E), which is located at a distance of 25 km from the eastern part of the Tan-Lu Fault, shows a counter-clockwise deflection of 67.3 • with respect to north. However, mean directions from the Nanzhang (31.5 • N, 111.7 • E), Tongling (30.9 • N, 117.9 • E) and Nanjing (32.0 • N, 118.9 • E) areas, which are located between 75 and 90 km from the northeastern boundary of the SCB, indicate a northeasterly deflection in declination, such as D = 38.2 • , I = 25.1 • (α 95 = 6.4 • ), D = 32.1 • , I = 25.2 • (α 95 = 9.7 • ) and D = 34.9 • , I = 27.8 • (α 95 = 5.4 • ), corresponding to palaeopoles of λ = 50.5 • N, φ = 220.5 • E, dp/dm = 3.7 • /6.9 • , λ = 55.6 • N, φ = 231.8 • E, dp/dm = 5.6 • /10.4 • and λ = 53.9 • N, φ = 229.1 • E, dp/dm = 3.2 • /5.9 • , respectively. Comparison with the previously reported Permo-Triassic palaeomagnetic results from the SCB suggests that very consistent palaeopoles are observed within a stable belt up to 1800 km along the northern margin of the SCB (covering the Changxing, Nanjing, Tongling, Nanzhang and Emeishan areas). This type of behaviour implies that an area located between 70 and 225 km from northern margin of the SCB forms a stable platform where very little relative rotation has been detected. However, the inner region of this block, especially the Mesozoic fold-thrust belt, experienced a clockwise rotation of 11.5 • ± 5.0 • to 30.3 • ± 9.2 • with respect to the stable outer region later than the Middle Triassic. Areas close to the Tan-Lu Fault were subjected to post-Triassic counter-clockwise rotation by 90 • with respect to the stable tectonic belt. We thus conclude that the northern stable belt of the SCB suffered no oroclinal bending during its suturing with the North China Block.

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Paleomagnetic study of western Tibet: deformation of a narrow zone along the Indus Zangbo suture between India and Asia

Cited by 32 publications

References 28 publications

Paleomagnetic versus GPS determined tectonic rotation around eastern Himalayan syntaxis in East Asia

Paleomagnetic versus GPS determined tectonic rotation around eastern Himalayan syntaxis in East Asia

When and where did India and Asia collide?

Regional deformational features of the South China Block inferred from Middle Triassic palaeomagnetic data

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