Study on the crust-mantle structure in the central and southern parts of Shanxi

Zhu, Zijiang; Zhang, Jian-shi; Zhang, Chengke; Zhao, Jun‐Hong; Liu, Ming-Qing; Tang, Zhou-Qiong; Gai, Yu-Jie; Ren, Qingwen; Nie, Wen-Ying; Qinye, Yang

doi:10.1007/s11589-999-0006-5

Cited by 8 publications

(5 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Their lithosphere thickness is 50∼70 km [3] . The results attained by other researchers are: the crustal depth is about 40 km in the western and southwestern margin of the Ordos block [16] , the crustal thickness near the Linfen basin is slightly smaller about 39 km from the studies of the velocity structure of crust and mantle in central and southern Shanxi with the teleseismic data, while to the west, crustal thickness is more than 42 km [17] . When the crustal thickness is small, the delay time is less than 0.3 s. Analyzing the thickness of the anisotropy layer in this region shows that the shear-wave splitting is mainly caused by the upper mantle.…”

Section: Sks Splitting Resultsmentioning

confidence: 91%

Seismic Anisotropy of Upper Mantle Beneath the Ordos Block and Adjacent Regions

Hu¹,

Cui²,

Qin³

et al. 2011

Chinese J of Geophysics

View full text Add to dashboard Cite

Based on the polarization analysis of teleseismic SKS waveform data recorded at 90 broadband stations in the Ordos block and adjacent regions, the splitting parameters of fast polarization direction and delay time between the fast and slow shear waves are determined for each station using the minimum transverse energy method, yielding the images of upper mantle anisotropy. Combined with the GPS horizontal velocity field with respect to the Ordos block during 1999~2007, we analyze the seismic anisotropy as well as the crust‐mantle coupling beneath the Ordos block and its adjacent regions. At last, a new understanding of the block movement and the dynamic causes of the adjacent fault zones is achieved. The results reveal that there are nulls in the block which show an obvious isotropic characteristic. The delay time of the adjacent stations is obviously greater than those in the central block, which indicates an obvious anisotropy. The fast polarization directions are compatible with the tectonic strike direction and the horizontal velocity direction, which shows the crust‐mantle coupling. The differences between the directions at some stations may be associated with the early block activities. According to the SKS shear wave splitting results and the current GPS velocity field, we suggest that the Ordos block has no rotation. Meanwhile, the horizontal and ascending intrusion and the transverse extension of the plastic material in the upper mantle lead to the bifurcated flow around the Liupan Shan Mountains in the southwestern margin of Ordos. The generation and development of the Fenwei graben are the result from upward intrusion and lateral spreading of upper mantle material along deep faults.

show abstract

Section: Sks Splitting Resultsmentioning

confidence: 91%

Seismic Anisotropy of Upper Mantle Beneath the Ordos Block and Adjacent Regions

Hu¹,

Cui²,

Qin³

et al. 2011

Chinese J of Geophysics

View full text Add to dashboard Cite

show abstract

“…TUZ is a region with the crust's thickness of more than 40 km. The velocity in the uppermost mantle is smaller than that beneath the Bohai Bay Basin [24] . And in this region, there exists abundant high velocity zones with some low velocity zones within the crust.…”

Section: Bh-02 Profile (Figure 10)mentioning

confidence: 81%

Seismic tomography of the crust and upper mantle in the Bohai Bay Basin and its adjacent regions

Zhang

Liu

Hao

et al. 2007

Sci. China Ser. D-Earth Sci.

View full text Add to dashboard Cite

In the Bohai Bay Basin and its adjacent regions (112°-124°E, 34°-42°N), there exists abundant gas-petroleum while modern inter-plate seismic activity is robust. Although the tectonic structure of this region is very complicated, plenty of geological, geophysical and geochemical data and results are obtained through previous researches. On the basis of absorbing previous results, especially various kinds of geological and geophysical results, we collect and process the arrival time of P-wave phases of local events and tele-seismic events recorded by the station within this region from 1978 to 2004, build the responding initial model, and image the velocity structure of the crust and upper mantle of this region via tomography. The perturbation images of various depths and velocity profiles imply that the velocity structure of the crust and upper mantle in the Bohai Bay Basin and its adjacent regions is mainly influenced by the surface tectonic units, and is characterized by "Stripped along east-west, and zoned along south-north"; some large-scaled faults penetrate Moho and lithosphere, and provide the channels for the basic lava or hot mass upwelling from the mantle.Bohai Bay Basin, tomography, crust and upper mantle

show abstract

“…Obviously, the geological structures of the shallow crust and the obvious variation of crust thickness have a close relation with the action and control of regional tectonic environments. The huge upheaval of upper-mantle in North China makes the material of lower crust transport laterally, so it results in the upheaval of Taihang mountain region and the crust thickening in Shanxi down-faulted zone [13] .…”

Section: The Major Results and Discussionmentioning

confidence: 99%

Features of Deep Crustal Structure Beneath the Wutai Mountain Area of Shanxi Province

Zhao¹,

Zhang²,

Zhang³

et al. 2006

Chinese J of Geophysics

Self Cite

View full text Add to dashboard Cite

In this paper, the deep crustal structures in Wutai mountain area are studied by using deep seismic sounding (DSS) data obtained from wide-angle reflection/refraction profiles which pass through Shanxi downfaulted zone and Wutai mountain area. The results show that the crust in this area presents obviously layered structures. The boundary interface between upper and lower crust is determined by means of reliable intra-crust reflected waves P3 that can be traced continuously. The thickness of upper crust is 23∼28km, and the depth of Moho discontinuity is 39∼43 km. The Moho discontinuity in Wutai mountain area is the deepest in this region. In Wutai mountain and its adjacent areas, the crust structures have strong inhomogeneous characteristics. The large-scale low velocity bodies in upper crust and strong intra-crust reflected wave groups can be regarded as a sign of magma activity in deep crust. The breaking of intra-crust interfaces and the local discontinuation of seismic wave group Pm as well as existence of deep crustal faults and so on indicate that the crust in this region suffered violent squeeze, deformation, and tectonic activities. Therefore the complex topography and anomalous structural characteristics in deep and shallow crust have been formed in this region.

show abstract

Study on the crust-mantle structure in the central and southern parts of Shanxi

Cited by 8 publications

References 2 publications

Seismic Anisotropy of Upper Mantle Beneath the Ordos Block and Adjacent Regions

Seismic Anisotropy of Upper Mantle Beneath the Ordos Block and Adjacent Regions

Seismic tomography of the crust and upper mantle in the Bohai Bay Basin and its adjacent regions

Features of Deep Crustal Structure Beneath the Wutai Mountain Area of Shanxi Province

Contact Info

Product

Resources

About