Geodynamics of the Shanxi Rift system, China

Xu, Xiwei; Ma, Xiaoguang

doi:10.1016/0040-1951(92)90353-8

Cited by 130 publications

(145 citation statements)

References 2 publications

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“…This is easy to be understood why the Shanxi rift system has been extending continuously, and consistent with the geological evidence that shows the similar conclusion (Deng et al 1973;Xu and Ma 1992;Zhang et al 1998). However, the difference from the results inferred from focal mechanism data is observed that orientation of magnetic fabrics indicates the dominated normal faulting regime around the Taigu fault system, while the strike-slip component is hard to be seen (Fig.…”

Section: Discussionsupporting

confidence: 49%

“…They found some evidences indicating that the Taigu fault is active in the Holocene, and concluded that the 1303 Hongdong M S 8.0 earthquake ruptured through the Mianshan west fault and also caused the movement of the Taigu fault. This is still controversial because some other studies show that the rupture zone of the 1303 Hongdong M S 8.0 earthquake is limited within the Huoshan piedmont fault to the south of our study area (Xu and Deng 1990;Xu and Ma 1992;Zhang et al 1998 …”

Section: Introductionmentioning

confidence: 99%

“…1), striking NE and mainly bounded by the two major faults: the Taigu fault on the southeast and Jiaocheng fault on the northwest. Both faults are high-angle normal faults with dextral strikeslip components, and control the formation and development of the basin (Xu and Ma 1992;Zhang et al 1998).…”

Section: Introductionmentioning

confidence: 99%

“…The Shanxi rift system, located in the east margin of the Ordos block, is composed of a series of en-echelon leftstepping asymmetrical half-graben basins (Deng et al 1973;Xu and Ma 1992;Li et al 2015a). The central part of the rift system is the Taiyuan basin ( Fig.…”

Section: Introductionmentioning

confidence: 99%

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Regional stress field around the Taigu fault zone in Shanxi Province, China

Sørensen

et al. 2015

Earthq Sci

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A comprehensive study on regional stress field around the Taigu fault zone in Shanxi Province, China, was performed in this study. To get a better understanding of the present-day stress status in this area, 31 focal mechanisms of M L C3 earthquakes since 1965 were compiled, and the best stress tensor was then inverted based on the database. Additionally, magnetic fabrics along the Taigu fault zone were investigated to get an indication of the regional stress field in the past. Our results show that the present-day stress field around the Taigu fault zone is characterized by astable NW-SE extension with a strikeslip component, consistent with the geological surveys and recent GPS data. Results from magnetic fabrics indicate that the orientations of principal stress axes from magnetic fabrics of sedimentary rocks in Neogene coincide to the orientations of principal stress axes from focal mechanisms. The south segment of the Taigu fault displays more complicated magnetic fabrics and more activity of moderate earthquakes. It is connected with the Mianshan west fault and intersects with NW-SE striking Fenyang fault and the north fault of the Lingshi uplift at the south edge of Taiyuan basin. This may be the area needing more attention in terms of seismic risk along the Taigu fault.

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Section: Discussionsupporting

confidence: 49%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Regional stress field around the Taigu fault zone in Shanxi Province, China

Sørensen

et al. 2015

Earthq Sci

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“…Зондский блок вращается по ча-совой стрелке со скоростью 0.13° млн лет -1 с полю-сом в Индийском океане к западу от Австралии (26.0 °S, 80.4 °E) [Kreemer et al, 2003]. Ордосский блок испытывал общее позднекайнозойское вра-щение против часовой стрелки [Xu, Ma, 1992]. По Рис.…”

Section: движение литосферы азии структурные перестройки на азиатскоunclassified

The latest geodynamics in Central Asia: primary and secondary mantle melting anomalies in the context of orogenesis, rifting, and lithospheric plate motions and interactions

Chuvashova¹,

Рассказов²,

Сунь³

2017

Geodin. tektonofiz.

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A comprehensive model for deep dynamics in Asia has been developed from the data on the evolution of melting anomalies in the context of lithospheric plate motions, interactions, orogeny, and rifting. The key components of our model are the primary (transition layer) and secondary (upper mantle) melting anomalies (Gobi, Baikal, and North Transbaikalia; and Hangay, Sayan, and Vitim, respectively). It is inferred that the primary melting anomalies originated at the beginning of the latest geodynamic stage (ca. 90 Ma) as a result of the transition layer distortion by lower mantle flows. Such primary anomalies were caused by avalanche collapses of the slab material that had been stagnated under the closed fragments of the Solonker, Ural-Mongolian paleooceans and the Mongol-Okhotsk Bay of Paleopacific. The secondary melting anomalies occurred due to the Early-Middle Miocene structural reorganization in the Pacific-Asian and Indo-Asian interaction zones. The primary melting anomalies governed the spatial distribution of forces and processes of the latest geodynamic stage. The secondary melting anomalies resulted from the lithospheric motions relative to the primary anomalies and provided for the development of orogeny and rifting. The BaikalMongolian corridor of asthenospheric flows was limited by the lateral zones of convergent interactions between India and Asia in the southwest, and North America and Asia in the northeast. In these lateral zones, Late Phanerozoic paleoslabs and ascending mantle fluxes were revealed in the transition layer, as well as in the upper mantle, without any destruction by the asthenospheric flows.

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Crustal structures across the western Weihe Graben, North China: Implications for extrusion tectonics at the northeast margin of Tibetan Plateau

et al. 2015

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The stable Ordos Plateau, extensional Weihe Graben, and Qinling orogenic belt are located at the northeast margin of the Tibetan Plateau. They have been thought to play different roles in the eastward expanding of the Tibetan Plateau. Peking University deployed a linear seismic array across the western end of the Weihe Graben to investigate the crustal structures of the tectonic provinces of this structure. Receiver function analyses revealed low-to-moderate Poisson's ratios and anticorrelations between Poisson's ratios and topography beneath the Qinling Orogen. These features may indicate a tectonic thickening of the felsic upper crust by folding and thrusting within the Qinling Orogen. We observed a strong horizontal negative signal at the midcrust beneath the Ordos Plateau which may indicate a low-velocity zone. This observation would suggest the stable cratonic Ordos Plateau had been modified due to the compression between the Tibetan Plateau and the Ordos Plateau. We also observed an abrupt 4 km Moho offset across the Weihe Fault, changing from~44 km beneath the Ordos Plateau to~40 km beneath the Qinling Orogen. We conclude that the Weihe Fault is a lithosphere-scale fault/shear zone, which extends into the upper mantle beneath the Weihe Graben. It acts as the major boundary separating the stable Ordos Plateau and the active Qinling Orogen.

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Geodynamics of the Shanxi Rift system, China

Cited by 130 publications

References 2 publications

Regional stress field around the Taigu fault zone in Shanxi Province, China

Regional stress field around the Taigu fault zone in Shanxi Province, China

The latest geodynamics in Central Asia: primary and secondary mantle melting anomalies in the context of orogenesis, rifting, and lithospheric plate motions and interactions

Crustal structures across the western Weihe Graben, North China: Implications for extrusion tectonics at the northeast margin of Tibetan Plateau

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