The Yingba shear zone on the Sino-Mongolian border: Southwestern extension of the Zuunbayan Fault from Mongolia to China and implications for Late Mesozoic intracontinental extension in Eastern Asia

Zhou, Yin-Zhang; Han, Bao‐Fu; Zhang, Bo; Zhao, Xu; Ren, Ruizhi; Li, Xiaowei; Su, Li

doi:10.1016/j.tecto.2012.08.042

Cited by 22 publications

(12 citation statements)

References 64 publications

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“…The Mesozoic granitic magma and mantle activity related to the broken‐off Mongol‐Okhotsk oceanic subducted slab caused the thickening of the crust beneath the Hentey Mountains. During the Early Mesozoic, the South Gobi Desert migrated southwestward about 185–250 km [ Lamb et al ., ; Webb et al ., ] along the sinistral strike‐slip Zuunbayan Fault, which likely resulted in a series of EW trending thrust sheets and folds in the South Gobi area [ Zhou et al ., ]. It produced a Late Jurassic‐Early Cretaceous extensional rifting basin.…”

Section: Discussionmentioning

confidence: 99%

“…The Mesozoic‐Cenozoic northeast striking Zuunbayan Fault (also known as the East Gobi Fault) is located in the South Gobi Desert. It has been proposed that this fault has undergone at least three phases of activation from the Mesozoic to the Cenozoic, with a total 400 km of sinistral offset [ Zhou et al ., ]. South of the Zuunbayan Fault are Precambrian basement rocks and former island arcs that lie between the Zuunbayan Fault and Solonker Suture (Figure ).…”

Section: Introductionmentioning

confidence: 99%

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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: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The crustal structure of south central Mongolia using receiver functions

Sandvol

et al. 2016

Tectonics

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“…[] attributed the formation of the Waziyu MCC to the collapse of an orogenically thickened crust that was facilitated by thermal weakening due to Early Cretaceous magmatism and paleo‐Pacific plate boundary reorganization. Other examples have also been ascribed to postcollisional collapse of early compressional structures [e.g., Donskaya et al ., ; Daoudene et al ., , ; Zhou et al ., ].…”

Section: Discussionmentioning

confidence: 99%

“…Most previous studies on the Cretaceous extensional tectonics in the NCC have focused on the characterization of early Cretaceous extensional structures in the NCC and contiguous areas and discussed the mechanisms and dynamics of regional extension based on structural analyses of the extensional structures [Davis et al, 1996;Ren et al, 2002;Liu et al, 2005;Charles et al, 2010]. One group of authors has stressed the effects of late Jurassic [Zhou et al, 2012] to early Cretaceous [Zheng et al, 1988;Davis et al, 1996;Darby et al, 2004] compressional thickening prior to regional extension.The Yunmengshan MCC to the north of Beijing [Zheng et al, 1988;Davis et al, 1996] and the Huhhot MCC near the China-Monglia border [Davis et al, 2002] were suggested as typical examples. Darby et al [2004] attributed the formation of the Waziyu MCC to the collapse of an orogenically thickened crust that was facilitated by thermal weakening due to Early Cretaceous magmatism and paleo-Pacific plate boundary reorganization.…”

Section: Two Stages Of Exhumation Of the Liaonan And The Wanfu Mccsmentioning

confidence: 99%

The Liaonan/Wanfu metamorphic core complexes in the Liaodong Peninsula: Two stages of exhumation and constraints on the destruction of the North China Craton

et al. 2013

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[1] The Liaodong Peninsula Early Cretaceous extension province (LEP), located in the eastern part of the North China Craton (NCC), was highly extended in early Cretaceous. The Liaonan and the Wanfu metamorphic core complexes (MCCs) are two most important elements in the province. Both are typical Cordilleran-type core complexes that are composed of a general three-layered structure but show various differences. Shearing along the Jinzhou detachment fault zone in the Liaonan MCC generated ductile to brittle tectonites, various deformation microstructures, and several types of quartz c-axis fabrics, implying that the MCC has a complicated progressive exhumation history. However, medium-temperature microstructures and fabrics are superimposed by low-temperature features along the Wanfu detachment fault zone suggesting a relatively short and simple exhumation history of the Wanfu MCC. Magmatic zircon U-Pb geochronological dating reveals that the early Cretaceous extension of the LEP began with the initiation of shearing along the Jinzhou detachment fault zone and exhumation of the Liaonan MCC before ca. 134 Ma. Subsequently, relatively slow cooling and exhumation of the lower plate accompanied a giant magmatic event from 130 Ma to 120 Ma. Exhumation of a new MCC, i.e., the Wanfu MCC, was triggered by progressive extension after ca. 120 Ma. Rapid cooling and exhumation of the metamorphic lower plate of the two MCCs are attributed to coeval detachment faulting along both the Jinzhou and Wanfu faults from 120 Ma to 113 Ma. The extension ended at ca. 107 Ma. These data provide reliable evidence that the two MCCs were exhumed progressively and sequentially during two stages of crustal extension of the LEP. Our results indicates that heterogeneous lithosphere extension and upper-middle crust/upper mantle detachment, possibly due to the interaction between the Paleo-Pacific and Eurasian plates, are among the most important processes during the early Cretaceous thinning of the lithosphere. Tectonic extension may have led to the detachment in East Asia, which contributed to the thinning of the lithosphere and the destruction of the NCC. A phase of uniform and consistent WNW-ESE extension was responsible for the generation of the extensional structures in the eastern Asia continent and the destruction of the NCC.

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“…(b) Tectonic division of western and central Inner Mongolia (the tectonic division marked in italic is after Xiao et al 2003 and Badarch, Cunningham & Windley, 2002; the tectonic division of the SOB and NOB, and the positions of the SME, SMM and HB are after Xu et al 2013). (c) Geological map of the study area in western Inner Mongolia (after NMBGMR, 1991; Zhou et al 2013). HLS – Helanshan; THS – Taihangshan; NCP – North China plate; SCB – South China Block; CAOB – Central Asian Orogenic Belt; SME – Southern Margin of the Ergun block; NOB – Northern Orogenic Belt; HB – Hunshandake block; SOB – Southern Orogenic Belt; SMM – Southern Mongolia Microcontinent; SB – Solonker Belt.…”

Section: Introductionmentioning

confidence: 99%

Superimposed deformation of the Solonker Belt and nearby regions in western Inner Mongolia, China

et al. 2018

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The deformation of the Solonker Belt and nearby regions is helpful for understanding the tectonic evolution of the Central Asian Orogenic Belt. This study carried out structural analysis in the Mandula and Ganqi areas of western Inner Mongolia, including the Solonker Belt, the Southern Orogenic Belt and the northern Yinshan Belt (Langshan range). Our results reveal that the Solonker Belt, the Southern Orogenic Belt and the northern Yinshan Belt underwent two stages (D1 and D2) of deformation during the Mesozoic period. The D1 stage produced the NNE-directed thrusts and asymmetric folds, indicating a NNE–SSW contraction. The northern Yinshan Belt, the Southern Orogenic Belt and the Solonker Belt formed as a series of NNE-verging tectonic nappes. The D2 stage developed the NE-trending folds and the SE- or NW-directed thrusts that cross-cut the D1 structures. The two events of nearly orthogonal or oblique shortening gave rise to the superimposed structures (e.g. fold interference patterns). The quartz veins that filled the fractures of the D1 deformation contain zircons of Middle Triassic U–Pb ages. The new dating data, along with the regional sedimentary hiatus, led us to infer that the D1 stage of deformation occurred in Middle Triassic time and the D2 stage occurred in Late Jurassic time. We consider that the D1 stage of deformation resulted from a convergent event, which might be related to the closure of the Palaeo-Asian Ocean or limited, narrow ocean basins; and the D2 stage of deformation was the far-field result of subduction of the Palaeo-Pacific Ocean and the closure of the Mongol-Okhotsk Ocean.

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The Yingba shear zone on the Sino-Mongolian border: Southwestern extension of the Zuunbayan Fault from Mongolia to China and implications for Late Mesozoic intracontinental extension in Eastern Asia

Cited by 22 publications

References 64 publications

The crustal structure of south central Mongolia using receiver functions

The crustal structure of south central Mongolia using receiver functions

The Liaonan/Wanfu metamorphic core complexes in the Liaodong Peninsula: Two stages of exhumation and constraints on the destruction of the North China Craton

Superimposed deformation of the Solonker Belt and nearby regions in western Inner Mongolia, China

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