Lithospheric structure and evolution of the Tibetan Plateau: the Yadong-Golmud geoscience transect

Wu, G.; Xiao, Xia; Li, Tingdon; Cheng, Qiansheng; Cui, Junwen; Cui, Zouzhou; Dong, Xuebin; Gao, Rui; Huang, He; Liu, Xun; Meng, Ling Shune; Sheng, Xianjie; Yu, Qingfan

doi:10.1016/0040-1951(93)90297-w

Cited by 22 publications

(10 citation statements)

References 11 publications

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“…At the same time, maybe the eastward mass flow beneath the Qinghai-Tibet plateau is caused by this huge thickness difference between the west and the east. Now, the bilateral subduction between the India plate and the Eurasia plate (Gao and Wu, 1995;Wu et al, 1991) has been proven by more and more deep geophysical evidence (Zheng et al, 2007;Pelkum et al, 2005;Xu et al, 2004;Kind et al, 2002;Gao et al, 2001a;Kao et al, 2001;Hauck et al, 1998;Zeng et al, 1998;Nelson et al, 1996;Makovsky et al, 1996;Zhao et al, 1993). The Qiangtang terrane is in the hinterland of the Qinghai-Tibet plateau, but its shallower Moho compared with the adjacent terranes may reflect the crustal collapse caused by the bilateral collision.…”

Section: Geodynamics Implied By Distribution Characteristics Of the Mmentioning

confidence: 93%

Moho depth of Qinghai-Tibet plateau revealed by seismic probing

Xiong

Gao

et al. 2009

J. Earth Sci.

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The Qinghai (青海)-Tibet plateau is the newest and biggest orogenic belt in the world and a natural laboratory for researching continental geodynamics, such as continent-continent collision, convergence, subduction, and plateau uplift. From the 1950s to the present, there have been many active-source (deep seismic sounding and deep seismic reflection profiling) and passive-source seismic probing (broadband seismic observations) implemented to reveal the crust-mantle structure. In this article, the authors mainly summarize the three seismic probings to discuss the Moho depth of the Qinghai-Tibet plateau based on the previous summaries. The result shows that the Moho of the Qinghai-Tibet plateau is very complex and its depth is very different; the whole outline of it is that the Moho depth is deeper beneath the south than the north and deeper in the west than in the east. In the Qiangtang (羌塘) terrane, the hinterland of the Qinghai-Tibet plateau, the Moho is shallower than both the southern and the northern sides. The deepest Moho is 40 km deeper than the shallowest Moho. This trend records the crustal thickening and thinning caused by the mutual response between the India plate and the Eurasia plate, and the eastward mass flow in the Qinghai-Tibet plateau. KEY WORDS: Moho depth, seismic probing, Qinghai-Tibet plateau.

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Section: Geodynamics Implied By Distribution Characteristics Of the Mmentioning

confidence: 93%

Moho depth of Qinghai-Tibet plateau revealed by seismic probing

Xiong

Gao

et al. 2009

J. Earth Sci.

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“…The Xianshuihe-Xiaojiang fault system, taking shape in the Cenozoic era, cuts three pre-Cenozoic tectonic units in the eastern Tibet, including the Bayan Har terrain on the northwest, the Yangtze Platform on the southeast and the Longmenshan-Yanyuan thrusting tectonic zone between them (Figure 1a; Wu et al, 1993;XU et al, 1992). The Anninghe fault originated from the pre-Cambrian.…”

Section: Geologic Setting In the Studied Areamentioning

confidence: 96%

Faulting on the Anninghe fault zone, Southwest China in Late Quaternary and its movement model

Ikeda

2007

Acta Seimol. Sin.

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The Anninghe fault is one of the significant earthquake-generating fault zones in the Southwest China. Local historical record shows that a M≥7 strong earthquake occurred in the year of 1536. On the basis of the detailed air-photographic interpretation and field investigation, we have acquired the following knowledge: 1 The average sinistral strike-slip rate since the Late Pleistocene is about 3~7 mm/a; 2 There is important reverse faulting along the fault zone besides the main left-lateral strike-slip motion, and the shortening rate across the Anninghe fault zone due to the reverse faulting is about 1.7~4.0 mm/a. If the Xianshuihe fault zone is simply partitioned into the Anninghe and Daliangshan faults, we can also get a slip rate of 3~7 mm/a along the Daliangshan fault zone, which is the same as that on the Anninghe fault zone. Moreover, on the basis of our field investigation and the latest knowledge concerning the active tectonics of Tibetan crust, we create a dynamic model for the Anninghe fault zone.

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“…Of them, the Anninghe fault zone has a longest evolutionary history, as long as that of the Kangdian Geo-anticline. The fault initiated in the pre-Cambrian, and controlled the sedimentary process and magmatic activity in the area [35,36] , re-activated as a part of the Longmenshan-Yanyuan thrust belt, until the Late Mesozoic. In the early evolutionary period, the Xianshuihe-Xiaojiang fault system selected and utilized pre-exist weaker Kangdian Geo-anticline and eastern boundary of the Longmenshan-Yanyuan thrust belt, shaping the Anninghe fault zone.…”

Section: Shortcutting On the Central Section Of The Xianshuihe-xiaojimentioning

confidence: 99%

Newly-generated Daliangshan fault zone — Shortcutting on the central section of Xianshuihe-Xiaojiang fault system

Ikeda

et al. 2008

Sci. China Ser. D-Earth Sci.

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The Daliangshan fault zone is the eastern branch in the central section of Xianshuihe-Xiaojiang fault system. It has been neglected for a long time, partly because of no destructive earthquake records along this fault zone. On the other hand, it is located on the remote and inaccessible plateau. So far it was excluded as part of the Xianshuihe-Xiaojiang fault system. Based on the interpretation of aerophotographs and field investigations, we document this fault zone in detail, and give an estimation of strike-slip rate about 3 mm/a in Late Quaternary together with age dating data. The results suggest that the Daliangshan fault zone is a newly-generated fault zone resulted from shortcutting in the central section of Xianshuihe-Xiaojiang fault system because of the clockwise rotation of the Southeastern Tibetan Crustal Block, which is bounded by the Xianshuihe-Xiaojiang fault system. Moreover, the shortcutting may make the Daliangshan fault zone replace the Anninghe and Zemuhe fault zones gradually, and finally, the later two fault zones will probably die out with the continuous clockwise rotation.Daliangshan fault zone, newly-generated fault, Xianshuihe-Xiaojiang fault system, southeast TibetThe arc-like Xianshuihe-Xiaojiang fault system can be divided into three sections. The northern, Xianshuihe fault zone, is a narrow tectonic zone; the southern, Xiaojiang fault zone, consists of two faults, which are parallel to and less than 20 km apart from each other; the central has more completed texture and higher fault density, presenting a spindle-like tectonic zone. The Daliangshan fault zone is the eastern boundary of the spindle-like tectonic zone (wide lines in the index of the Figure 1). Almost all of the previous researches were focused on the Xianshuihe fault zone, Xiaojiang fault zone and the Aninghe, Zemuhe fault zones, the western boundary of the central spindle-like tectonic zone. The eastern boundary of the spindle tectonic zone, Daliangshan fault zone, has been neglected for a long time and even excluded as the part of the Xianshuihe-Xiaojiang fault system in some researches [2][3][4][5] , partly because of no destructive earthquake records along the fault zone and partly because of its location on the remote and inaccessible plateau. The other important reason is that the Daliangshan fault zone is a newly-generated tectonic zone. The maturity of the newly-generated fault zone is lower than other faults in the fault system, and then the tectonic landform along the lower matured fault does not present itself as obviously as other faults. Based on the

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Lithospheric structure and evolution of the Tibetan Plateau: the Yadong-Golmud geoscience transect

Cited by 22 publications

References 11 publications

Moho depth of Qinghai-Tibet plateau revealed by seismic probing

Moho depth of Qinghai-Tibet plateau revealed by seismic probing

Faulting on the Anninghe fault zone, Southwest China in Late Quaternary and its movement model

Newly-generated Daliangshan fault zone — Shortcutting on the central section of Xianshuihe-Xiaojiang fault system

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