Magmatism within the northern margin of the South China Sea during the post-rift stage: An overview, and new insights into the geodynamics

Chen, Yingjie; Mei, Lianfu; Pang, Xiong; Zheng, Jinyun; Ye, Qing; Hao, Shihao

doi:10.1016/j.earscirev.2022.103917

Cited by 15 publications

(4 citation statements)

References 175 publications

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“…Without further mountain building, Late Neogene fold-and-trust belt developed in the offshore Borneo and Palawan. Several magmatism-related unconformities are also noticed during in the SCS, while no significant crustal thinning and seafloor spreading in this period [Jiang et al, 2018, Xia et al, 2018, Fan et al, 2019, Gao et al, 2019, Li et al, 2022.…”

Section: The Middle Miocene To Recent (After 16 Ma)mentioning

confidence: 77%

Rifting and seafloor spreading in the South China sea: a subduction-related extension on the down-going plate?

Chang,

Pubellier

2024

Comptes Rendus. Géoscience

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Active margins are sensitive to several subduction-related processes which include rapid opening and closure of neighboring basins. The stages of rifting, spreading and the cessation, of activity the South China Sea basin in Cenozoic appears to be coeval with the progressive closure of the Proto-South China Sea which ended with collision in Borneo and Palawan. The evolution bracketed between 45 Ma and 16 Ma, migrated through time from NE to SW. This dual simultaneous tectonic evolution illustrates how far-field subduction process may impact the regional tectonics in terms of both rifting and contraction of the crust from initiation to termination.

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Section: The Middle Miocene To Recent (After 16 Ma)mentioning

confidence: 77%

Rifting and seafloor spreading in the South China sea: a subduction-related extension on the down-going plate?

Chang,

Pubellier

2024

Comptes Rendus. Géoscience

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“…Consequently, we speculate that the formation of HVLC was associated with syn-rift magmatism underplating the lower crust, which is in line with the results of other studies (Hao et al, 2021;Liu et al, 2008;Sun et al, 2019;Zhang et al, 2023aZhang et al, , 2023b. However, it cannot be ruled out that post-rift magmatism (e.g., Li et al, 2022;Sun et al, 2020) could have also contributed to the emplacement of HVLC (Fan et al, 2017;Yan et al, 2006). Therefore, there might be a multi-phase (from syn-rift to post-rift) emplacement of HVLC as suggested by Hao et al (2021) and the HVLC emplaced during the syn-rift phase may be comparatively important.…”

Section: Role Of Magmatism In Deep Crustal Structurementioning

confidence: 99%

3D Crustal Architecture and Along‐Strike Variation in the Mid‐Northern South China Sea Rifted Margin

Hao,

Mei,

Ranero

et al. 2024

JGR Solid Earth

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Rifted margins often show apparent along‐strike variations at the continent‐ocean transition (COT) region, typically occurring gradually over hundreds‐to‐thousands of km between the “magma‐rich” and “magma‐poor” endmembers. In contrast, comparatively smaller‐scale lateral variabilities of rifting structure and faulting style in hyper‐thinned continental crust are not yet well described. The South China Sea (SCS) was recently defined as the archetype of a new “intermediate‐type” margin with neither excess magmatism nor mantle exhumation. However, along‐strike crustal variations along this new type of margin are still little explored. Based on previously unpublished 2D grid of seismic reflection lines and overlapping 3D seismic volumes, we have investigated the crustal structure, faulting style, and the lower crustal reflectivity along ∼400 km of the mid‐northern SCS margin. Our new maps of crystalline‐crust thickness and top basement show that the SCS extension developed in two segments with contrasting tectonic styles separated by a narrow boundary. The eastern domain, resembling a wide‐rift model, displays low‐angle detachment faults and high‐velocity lower crust mainly associated with syn‐rift magmatism indicating weak crustal rheology. The neighboring western domain, resembling a narrow rift model, displays steep crustal‐scale faults indicating comparatively strong rheology. The change from wide to narrow rift—or weak to strong rheology—occurs abruptly, which appears at odds with the current conventional wisdom of mostly gradual transitions over a long distance between rift models. We speculate that the inherited heterogeneity in mantle composition and 3D melt focusing effect may drive this abrupt along‐strike variability in the mid‐northern SCS.

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“…Due to a lack of seaward dipping reflectors (Barckhausen and Roeser, 2004;Franke et al, 2014;Brune et al, 2016), the northern SCS margin was classified into non-volcanic margin. With an advance in understanding of seismic and drilling data, the opinion about rifting-related magmatism is changing recently (Larsen et al, 2018;Sun et al, 2018;Ding et al, 2020;Li et al, 2022). However, general consensus so far is that the margin was not as magma-rich as NE Atlantic margins.…”

Section: Geological Settingmentioning

confidence: 99%

An approach to determine brittle upper crustal thinning: Insights into crustal extension discrepancy in the central part of Qiongdongnan Basin

He¹,

Zhao²,

Lee³

et al. 2023

Front. Earth Sci.

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Summing fault heaves is the most commonly used method to evaluate upper crustal thinning. However, since fault deformation width (W) is often assumed as a constant in the range of 75–150 km, the stretching factor estimated from fault geometry (βf) accompanies significant uncertainty. Here we propose a new approach to determine brittle stretching factors on the foundation of numerical analyses of W and further compare our results to previous methods, with specific reference to the central part of Qiongdongnan Basin, South China Sea (SCS). Our results suggest that the value of W is generally less than 80 km and mostly less than 50 km in the northern SCS margin. We confirm that applying an overestimated value of W can lead to an underestimated amount of fault-related extension and overstatement of extension discrepancy in the rifted margin. Results also indicate an inverse discrepancy with our new method in the southeast of the basin. The difference in syn-rift sediment thickness across the rifted margin likely drove the lower crust flow causing a transition between inverse and positive extension discrepancies.

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Magmatism within the northern margin of the South China Sea during the post-rift stage: An overview, and new insights into the geodynamics

Cited by 15 publications

References 175 publications

Rifting and seafloor spreading in the South China sea: a subduction-related extension on the down-going plate?

Rifting and seafloor spreading in the South China sea: a subduction-related extension on the down-going plate?

3D Crustal Architecture and Along‐Strike Variation in the Mid‐Northern South China Sea Rifted Margin

An approach to determine brittle upper crustal thinning: Insights into crustal extension discrepancy in the central part of Qiongdongnan Basin

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