Development of a mid-Neoproterozoic arched rift in eastern South China as a response to the Rodinia breakup

Liu, Junlai; Hu, Jun; Zeng, Yan; Meng, Linghui; Li, Wei

doi:10.1016/j.precamres.2023.107123

Cited by 2 publications

(1 citation statement)

References 84 publications

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“…Neoproterozoic extension, Rodinia breakup, Li, Z.X. Li, Li, et al, 2003b;Wang & Li, 2003;Yu et al, 2023;Late Devonian-Early Carboniferous, Zapata et al, 2019; Cretaceous, references see above). The Cretaceous extension event of the South-eastern China Block must belong to a geological event with global significance.…”

Section: Tectonic Implications Of the Growth Strata In The Secbmentioning

confidence: 99%

Timing of the initiation and duration of the Cretaceous extensional regime in South‐east China: Constraints from growth strata in terrigenous basins

Yu,

Hu,

et al. 2023

The Depositional Record

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There has been no consensus yet regarding the precise initial timing and duration of the late Mesozoic extensional tectonics in the South‐eastern China Block. This work focusses on the growth strata of the Early Cretaceous red beds in the South‐eastern China Block to determine the late Mesozoic tectonics and the precise timing of the initiation and duration of extensional tectonics in this area. Field observation of several terrigenous basins shows that the dip angles of the Cretaceous red beds have varied from moderate to gentle from basin edges to interiors (or centres). The visible and estimated thickness within a single bed increases slightly downwards from the upper to the lower part. These characteristics indicate that the sedimentary area of these beds has undergone an extensional process with expansion and deepening of the sedimentary basins. Rotation of the border surfaces (limbs) and downward warping of the hanging walls or retreat of the footwalls of listric normal faults causes three types of extensional growth (or syntectonic) strata in the deposits of different basins. Dating of the volcanic rocks related to the growth beds reveals that the sedimentary basins were enlarged and deepened when the Early Cretaceous strata were deposited in the South‐eastern China Block from ca 140 to 137 Ma. Regionally, under the influence of Palaeo‐Pacific plate rollback since ca 140 Ma, the South‐eastern China Block stress field has led to lithospheric uplift and pull‐apart structures near the surface, causing the half‐graben basins to receive sedimentation. Although the extensional event was interrupted by a short compressional event during 120 to 105 Ma, with the oceanward retreat of the trench, the area of extension gradually enlarged and rejuvenated south‐eastwards until the end of the Cretaceous. This Cretaceous extension event of the South‐eastern China Block must belong to a worldwide geological event with global significance.

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Section: Tectonic Implications Of the Growth Strata In The Secbmentioning

confidence: 99%

Timing of the initiation and duration of the Cretaceous extensional regime in South‐east China: Constraints from growth strata in terrigenous basins

Yu,

Hu,

et al. 2023

The Depositional Record

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Early Paleozoic ductile deformation of the South China Block: the polyphase shear zones in the eastern Jiangnan belt

Hu,

Yu,

et al. 2023

JGS

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Three parallel east–west (E–W)-trending shear zones are components of the polyphase shear zones in the eastern Jiangnan belt. The meso- and microstructural characteristics and the estimates of deformation temperatures, vorticities, and geochronology of these shear zones provide significant information regarding the tectonic evolution of the South China Block (SCB) during the early Paleozoic. Most shear sense indicators (e.g., asymmetric folds, S-C fabrics, and rotating porphyroclasts) reveal that the kinematics were characterized by E–W dextral shear. Finite strain measurements indicate an oblate strain ellipsoid shape with S-type and SL-type tectonites. The rotated rigid porphyroclasts and Mohr circle methods yield vorticity (Wk) values of 0.58–0.80 and 0.66–0.89, respectively, indicating that the flow was generally shear-dominated with almost equal proportions of simple and pure shear. Both mineral deformation thermometers and quartz c-axis fabrics indicate that the deformation occurred at medium temperature conditions of 400–550℃. Combined with our new age and regional geological data, the E–W-trending shear zones might represent an increment of deformation during the last period of the early Paleozoic orogeny in the SCB.

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Development of a mid-Neoproterozoic arched rift in eastern South China as a response to the Rodinia breakup

Cited by 2 publications

References 84 publications

Timing of the initiation and duration of the Cretaceous extensional regime in South‐east China: Constraints from growth strata in terrigenous basins

Timing of the initiation and duration of the Cretaceous extensional regime in South‐east China: Constraints from growth strata in terrigenous basins

Early Paleozoic ductile deformation of the South China Block: the polyphase shear zones in the eastern Jiangnan belt

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