Jurassic provenances and their transition mechanism of the Delingha Sag in the eastern segment of northern margin of the Qaidam Basin, North Tibet

Feng, Huaiwei; Wang, Jinduo; Zhang, Guanlong; Zeng, Zhiping; Shu, Pengcheng

doi:10.1016/j.geogeo.2022.100097

Cited by 4 publications

(4 citation statements)

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“…The Northern Qaidam Basin (NQB) is located in the northwest and northeast parts of the Qaidam Basin. It is surrounded by the ATF to the northwest, Qilian Range to the northeast and Mengbei-Lingjian-Dahuo Fault to the south (H. W. Feng et al, 2017Feng et al, , 2022.…”

Section: Characteristics Of Jurassic Sedimentary Migration In the Nor...mentioning

confidence: 99%

“…Influenced by ATF dextral strike‐slip faulting, Although the distribution of the Middle Jurassic expanded from the south margin of the ATF to the easternmost part of the NQB, the depocenter still in the south margin of the ATF. It is mainly composed of pebbly sandstone and siltstone interbedded with carbonaceous shale and coal seams in the lower part, coal‐bearing rock in the middle part and black carbonaceous shales, mudstones, and oil shales in the upper part, interpreting as a continuously deepening sedimentary environment from braided river delta to lacustrine (Figure 7, H. W. Feng et al, 2017, 2022).…”

Section: Characteristics Of Depositional Migration In the Altyn Tagh ...mentioning

confidence: 99%

“…It also outcropped in the Hongshan, Huobuxun, Delingha and other areas along the eastern segment of the NQB. The J 3 c is dominated by purplish‐red and brownish‐red mudstones as well as sandy mudstones in the lower part; and the J 3 h mainly composed of purple mudstones with grey‐green or bluish‐grey siltstone in the upper part, representing shore‐shallow lacustrine environment (Figure 7, H. W. Feng et al, 2022; Z. Li et al, 2015; Wei et al, 2017; Wu et al, 2011).…”

Section: Characteristics Of Depositional Migration In the Altyn Tagh ...mentioning

confidence: 99%

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Jurassic sedimentary migration characteristics and their geodynamic implications in the Dunhuang Basin and adjacent regions, Northwestern China

Feng,

Xu,

Xubo

et al. 2024

Geological Journal

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The Dunhuang Basin, situated in western China along the Altyn Tagh Fault (ATF) zone, intersects the Tethys and Paleo‐Asian Ocean tectonic domains. Influenced by both the ATF system and the far‐field effects of the Qiangtang‐Lhasa‐Eurasia collision during the Mesozoic, the mechanism of the Jurassic sedimentary migration of the basin in response to tectonic movements is unclear so far. The paper uses a comprehensive approach, including field geological surveys, lithologic and lithofacies discern, stratigraphic relationships analysis and 2D seismic profile interpretation, to examine the distribution of Jurassic residual strata in the basin. The comprehensive results of our study suggest that the Dunhuang Basin exists as an isolated block with unique tectonic and sedimentary evolution characteristics. In the Early Jurassic, the Dunhuang Basin underwent initial rifting, leading to the formation of small segmented intermontane sags. This phase was marked by the coarse particle sedimentary system of alluvial fans and braided rivers, represented the near source rapid deposition in the initial formation period of the basin. Stratigraphic distribution was primarily influenced by pre‐Jurassic basement topography and was not significantly constrained by faulting during this period. The formation of these isolated discontinuous small intermontane sags indicates the segmented activities of the ATF in the Early Jurassic period. In the Middle Jurassic period, influenced by the ATF dextral strike‐slip faulting, sedimentation extended eastward and the depocenter migrated clockwise compared with the distribution of the Middle Jurassic strata within the Dunhuang Basin. This period witnessed the development of coal measure strata at the basin's margins and lacustrine fine‐grained clastic deposition in the centre. The segmented fracture of the ATF gradually initiated a unified dextral strike‐slip tectonic movement. In the Late Jurassic period, sedimentary strata were locally present in the Wanyao Sag but absent in other sags. The depocenter migrated counterclockwise compared with the distribution of Middle Jurassic strata within the Dunhuang Basin, due to regional uplift accompanied by the ATF sinistral strike‐slip faulting caused by the collision between the Lhasa Block and the Eurasia Plate. The depocenter migration of the Dunhuang Basin constrained within the ATF system from the Early to Middle and Late Jurassic can be attributed to the transition of the ATF strike‐slip faulting in context of the stress relaxation and compression between the collision of the Qiangtang and Lhasa blocks to the Eurasia Plate, respectively.

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Section: Characteristics Of Jurassic Sedimentary Migration In the Nor...mentioning

confidence: 99%

Section: Characteristics Of Depositional Migration In the Altyn Tagh ...mentioning

confidence: 99%

Section: Characteristics Of Depositional Migration In the Altyn Tagh ...mentioning

confidence: 99%

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Jurassic sedimentary migration characteristics and their geodynamic implications in the Dunhuang Basin and adjacent regions, Northwestern China

Feng,

Xu,

Xubo

et al. 2024

Geological Journal

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“…The contraction of the Paleo-Tethys Ocean began through subduction in the Early Permian and mostly ended up with a closure in the Triassic (Wang et al, 2020;Feng et al, 2022). It induced the continental collision of the SCB with the Indochina block at Song Ma suture on the southern margin, causing extensive and intense intra-continental deformation in the SCB (Lin et al, 2008;Li S. Z. et al, 2017;Shu et al, 2021).…”

Section: Structural Evolution Of the Youjiang Foldand-thrust Beltmentioning

confidence: 99%

Polyphase deformation of the Youjiang fold-and-thrust belt during the Mesozoic: Implications for the tectonic transition of the South China block

Xiao²,

Changshan³

et al. 2023

Front. Earth Sci.

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The South China block (SCB) experienced the tectonic transition from the Paleo-Tethys to the Paleo-Pacific tectonic domains during the Mesozoic, but the transition process is hotly debated. The Youjiang fold-and-thrust belt (YFTB), in the interior of the Youjiang Basin in the southwestern SCB, is located in a junction of these two tectonic domains and thus witnessed their tectonic evolution. It also separates the northern thin-skinned structures from the southern thick-skinned structures in the basin. Therefore, the YFTB is an intriguing window into the Mesozoic evolution in the southwestern SCB and the Mesozoic tectonic transition of the SCB. In this study, we conduct structural analysis at the middle of the YFTB and discuss the Mesozoic tectonic transition of the SCB. Four phases of deformation are identified in the YFTB during the Mesozoic. The first phase of deformation (D1) is characterized by a series of conjugate joints, NW–SE trending thrust faults and folds resulting from NE–SW shortening that was related to the collision between the SCB and Indochina block. The second phase of deformation (D2) is manifested by the pre-existing NW–SE striking thrust faults transformed to normal faults and the Late Triassic mafic magmatism. Our structural observations, combined with previous geochronological data for mafic dykes, suggest the study area experienced post-orogenic extension in the Late Triassic. The third phase of deformation (D3), accompanied with the westward subduction of the Paleo-Pacific oceanic plate, is represented by a series of conjugate joints and NE–SW-striking faults formed by NW–SE compression. As a result of the continuous subduction of the Paleo-Pacific plate and its subsequent slab rollback, the fourth phase of deformation (D4) is featured with normal faults, magmatic-hydrothermal activities, and regional mineralization, which are associated with the nearly E–W extension setting. Our study results indicate that, in the Early Mesozoic, the Youjiang Basin was dominated by the Paleo-Tethys domain and then transitioned to the Paleo-Pacific domain. Together with the magmatic lull between the Triassic and the Early-Middle Jurassic identified in the SCB, we propose that the tectonic transition process manifested in the YFTB more likely initiated in the Early Jurassic.

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Paleocurrent and paleowind direction reconstruction research progress and perspectives: a review

Zhao

Han

et al. 2023

Australian Journal of Earth Sciences

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Jurassic provenances and their transition mechanism of the Delingha Sag in the eastern segment of northern margin of the Qaidam Basin, North Tibet

Cited by 4 publications

References 30 publications

Jurassic sedimentary migration characteristics and their geodynamic implications in the Dunhuang Basin and adjacent regions, Northwestern China

Jurassic sedimentary migration characteristics and their geodynamic implications in the Dunhuang Basin and adjacent regions, Northwestern China

Polyphase deformation of the Youjiang fold-and-thrust belt during the Mesozoic: Implications for the tectonic transition of the South China block

Paleocurrent and paleowind direction reconstruction research progress and perspectives: a review

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