Crustal structure of the northern margin of the North China Craton and adjacent region from SinoProbe02 North China seismic WAR/R experiment

Li, Wenhui; Keller, G. Randy; Gao, Rui; Li, Qiusheng; Cox, C. M.; Hanru, Hou; Li, Yingkang; Guan, Yisheng; Zhang, Shihong

doi:10.1016/j.tecto.2013.04.007

Cited by 13 publications

(10 citation statements)

References 30 publications

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“…The H‐k stacking approach generally only works for regions with modest variations in crustal structure, and this appears to be the case in south central Mongolia. All stacks are obtained using the IASP91 velocity model and an average crustal P velocity of 6.3 km/s [ Li et al ., ; Li et al ., ]. Finally, we discard those stations if their P or Ps phases cannot be observed clearly and their standard deviations of H is greater than 2 or of k is greater than 0.03, which are estimated from the bootstrapped stack.…”

Section: Methodsmentioning

confidence: 99%

The crustal structure of south central Mongolia using receiver functions

Sandvol

et al. 2016

Tectonics

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The crustal thickness H and average crustal velocity ratio k (Vp/Vs) beneath south central Mongolia are investigated using the H-k stacking method based on teleseismic radial receiver functions. Our primary results reveal that the local crustal thickness varies from 38 to 46 km with an average value of 43 km. Thicker crust is found beneath the western Hentey Mountains, while thinner crust is located in the southern area of the Zuunbayan fault zone. The Bouguer gravity anomalies exhibit a strong correlation with the overall crustal thickness pattern throughout most of our study regime. Moreover, a new approach which integrates the Bouguer anomaly gradient and the receiver function-derived crustal thickness is adopted to calculate the density of the lower crust underneath central Mongolia. Fairly dense lower crust of approximately 3000 kg/m 3 is found in the Middle Gobi Desert. The measured crustal Vp/Vs ratio ranges from 1.68 to 1.83 with an average value of 1.74. Low Vp/Vs ratio is found beneath the western Hentey Mountains. In general, low Vp/Vs ratios correlate well with regions of quartz-rich crust and high heat flow. High Vp/Vs ratios occur in the Middle Gobi volcanic regions and the Mesozoic Southern Gobi Basin.

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Section: Methodsmentioning

confidence: 99%

The crustal structure of south central Mongolia using receiver functions

Sandvol

et al. 2016

Tectonics

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“…Additionally, this high‐velocity body was interpreted as a continental arc generated by the southward subduction of the Paleo‐Asian Ocean. The location of the boundary between the CAOB and the NCC at depth was based on the significant velocity gradient close to the Chifeng fault (W. Li et al, ).…”

Section: Previous Geophysical Studiesmentioning

confidence: 99%

“…The SINOPROBE program collected a northwest‐southeast trending seismic refraction and wide‐angle reflection profile as shown in Figure (W. Li et al, ; Zhang et al, ), which is parallel to our MT profile and located about 100 km to the east. The crustal P wave velocity model from the Solonker Suture to the Yinshan‐Yanshan Belt (YYB) was derived by ray tracing modeling (W. Li et al, ). The P wave velocity model shows significant lateral velocity variation between the CAOB and the NCC.…”

Section: Previous Geophysical Studiesmentioning

confidence: 99%

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The Lithospheric Structure of the Solonker Suture Zone and Adjacent Areas: Crustal Anisotropy Revealed by a High‐Resolution Magnetotelluric Study

Unsworth

Wei

et al. 2019

JGR Solid Earth

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The closure of the Paleo‐Asian Ocean along the Solonker Suture Zone (SSZ) during the Late Permian and Triassic represented the final stage in the formation of the Central Asian Orogenic Belt between the Siberian Craton and the North China Craton. In order to better understand the structure and formation of this ancient plate boundary, a high‐resolution magnetotelluric (MT) profile was collected in 2010–2012 with both broadband and long‐period MT data. Dimensionality analysis showed that a 2‐D analysis was valid. Both 2‐D isotropic and anisotropic resistivity models were derived from the joint inversion of MT and tipper data. The high‐resolution mapping achieved in this study is due to the closely spaced MT stations (2–3 km). The major south dipping conductive layer was detected beneath the SSZ and found to be electrically anisotropic with the highest conductivity in the down dip direction. This feature was interpreted as evidence for southward subduction forming the suture. Previous studies of electrical anisotropy in Paleoproterozoic orogens have reported electrical anisotropy with the maximum conductivity in the strike direction. The high conductivity has been interpreted as being due to graphite or sulfides concentrated in fold hinges. In contrast to these studies, the Solonker Suture conductor shows an enhanced conductivity in the dip direction. The difference between these situations could be explained if the Solonker Suture has the fold axes rotated by high strain into the strike direction. This would result in the highest conductivity being parallel to the dip direction.

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“…Therefore, the central segment of the CAOB is thought to be the most plausible area in which to observe preserved intrinsic tectonic features created by the closure of the Paleo‐Asian Ocean. An integrated geophysical profile has been created from the Huailai basin to the China‐Mongolia border in the central segment of the CAOB (see Figure ), including a deep seismic reflection profile (S. Zhang, Gao, et al, ), a wide‐angle reflection and refraction profile (W. Li et al, ), a magnetotelluric sounding profile (Liang et al, ), and a broadband seismic profile (Gong et al, ). The detailed structure of the crust has been resolved in the above mentioned profiles, but the structure of the deep lithosphere, which is essential for analyzing the termination of the Paleo‐Asian Ocean, remains unclear.…”

Section: Introductionmentioning

confidence: 99%

New Seismic Evidence for Continental Collision During the Assembly of the Central Asian Orogenic Belt

Zhang

et al. 2018

JGR Solid Earth

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The Central Asian Orogenic Belt (CAOB) was formed during the termination of the Paleo‐Asian Ocean in the Paleozoic. However, the mechanism and process of the Paleo‐Asian Ocean closure and CAOB formation remain controversial. This study presents a seismic image from the northern North China Craton to southern Mongolia derived from P and S receiver function analyses of the teleseismic records from a dense array. Our observations reveal a thicker lithosphere in the southern CAOB than in the Bohai Bay basin, which suggests that this Paleozoic orogen was less affected by the lithosphere reactivation in the eastern North China Craton during the Late Mesozoic. The imaged lithosphere‐asthenosphere boundary of the southern CAOB deepens southward and reaches a greatest depth of approximately 130 km beneath the Xilinhot fault, the northern boundary of the Solonker suture zone. The Moho displays a local uplift of approximately 5 km beneath the Linxi fault, the southern boundary of the Solonker suture zone. These features imply that the Solonker suture zone is the most plausible site of the lithosphere collision between the opposing continental margins. Additionally, a southward dipping intracrustal interface, whose depth extends from ~16 km beneath the Baolidao belt to ~20 km beneath the Linxi fault, is interpreted to be associated with the subduction of the Paleo‐Asian Oceanic slab. Additionally, the absence of lithosphere‐asthenosphere boundary phases beneath the Bainaimiao arc is inferred to be caused by the upwelling of hot mantle material after assembly of the CAOB.

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Crustal structure of the northern margin of the North China Craton and adjacent region from SinoProbe02 North China seismic WAR/R experiment

Cited by 13 publications

References 30 publications

The crustal structure of south central Mongolia using receiver functions

The crustal structure of south central Mongolia using receiver functions

The Lithospheric Structure of the Solonker Suture Zone and Adjacent Areas: Crustal Anisotropy Revealed by a High‐Resolution Magnetotelluric Study

New Seismic Evidence for Continental Collision During the Assembly of the Central Asian Orogenic Belt

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