Site U1431

Li, C.-F.; Lin, Jian; Kulhanek, Denise K.; Williams, T.; Bao, Rui; Briais, A.; Brown, Elizabeth; Chen, Y.; Clift, Peter D.; Colwell, Frederick S.; Dadd, K.A.; Ding, Weiwei; Hernández‐Almeida, Iván; Huang, Xiaoxia; Hyun, Sangmin; Jiang, Tao; Koppers, A. A.; Li, Q.; Liu, C.; Liu, Q.; Liu, Z.; Nagai, Renata Hanae; Peleo-Alampay, A.; Su, Xinming; Sun, Zhen; Tejada, M. L. G.; Trinh, H.S.; Yeh, Yun-Chi; Zhang, C.; Zhang, F.; Zhang, G.-L.; Zhao, Xixi

doi:10.14379/iodp.proc.349.103.2015

Cited by 11 publications

(25 citation statements)

References 34 publications

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“…There, the last phase of seafloor spreading is N055° oriented in a ∼150 km wide strip (Sibuet et al, ) and the postspreading Zhenbei‐Huangyan seamount chain is oriented E‐W over a distance of 220 km within this strip. It contradicts what was previously published with the last phase of spreading oriented E‐W and parallel to the postspreading chain of volcanoes (e.g., Barckhausen et al, ; Briais et al, ; Li et al, , b). Thus, a new relocalization of the trends of magnetic lineations and their identifications are still required.…”

Section: Introductioncontrasting

confidence: 82%

“…We have identified positive N0558 oriented magnetic trends on the Li et al (2015b) magnetic map of Figure 8c (thick white dashed lines). If we assume these magnetic trends were continuous during the last spreading phase, i.e., before postspreading volcanism started, and if we assume that there is no significant ridge jump, our proposed location of the ESR (yellow thick dashed line) would be the axis of symmetry of N0558 trends.…”

Section: Location Of the Extinct Spreading Ridge In The East Subbasinmentioning

confidence: 82%

“…Their hypothesis is that all identified magnetic lineations from C6 to C5c are parallel to the orientation of the Zhenbei-Huangyan seamounts chain that was emplaced along a former E-W trending ESR. However, looking in detail at magnetic picks of Li et al (2015b) in between the two clear and indisputable E-W trending lineations C6 that we have underlined by thick white dashed lines in Figure 8c, the E-W directions of their lineations are questionable: (1) the four eastern picks of their lineation C5e north follow a N0558 negative trend but the three westernmost picks correspond to the postspreading Zhangzhong seamount negative magnetic anomaly, and have consequently no relationship with the four eastern picks; (2) the two western picks of their lineation C5d north do not follow the same magnetic trend than the two eastern picks; (3) the two picks of their lineation C5c do not belong to the same magnetic lineation, one corresponding to a positive anomaly, the other one to a negative anomaly and are N0558 trending.…”

Section: Location Of the Extinct Spreading Ridge In The East Subbasinmentioning

confidence: 99%

“…The four ovals indicate the two N-S trending Chain A, E-W trending Chain B, and NE-SW trending Chain C. The thick dashed yellow lines represent the extinct spreading ridge (ESR), and N0558 trending white dashed lines magnetic lineations identified in this study. For comparison, thin white solid lines are magnetic lineations identified by Li et al (2015b). M1 and M2 are two characteristic magnetic lineations (Li & Song, 2012) identified as C8 and dated 27.5 Ma (Briais et al, 1993) or 26 Ma (Gradstein et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…M1 and M2 are two characteristic magnetic lineations (Li & Song, 2012) identified as C8 and dated 27.5 Ma (Briais et al, 1993) or 26 Ma (Gradstein et al, 2005). The location of the Zhongnan faults zone (red dashed lines) is from Li et al (2015b). East of the yellow broken line located between Chains B and C, magnetic lineations cannot be defined because of the presence of transfer faults, pseudo-faults and overlapping spreading centers (Hsu et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Postseafloor Spreading Volcanism in the Central East South China Sea and Its Formation Through an Extremely Thin Oceanic Crust

Zhao

Sibuet

et al. 2018

Geochem Geophys Geosyst

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P wave velocity models were obtained by forward and inverse modeling from 38 ocean bottom seismometers deployed in the central East subbasin of the South China Sea (SCS). Four types of crust have been defined: (a) thin oceanic crust (<5 km), (b) typical oceanic crust (5–6 km), (c) thick oceanic crust hosting postspreading volcanoes (>6 km) with significant intrusive roots, and (d) thick oceanic crust with enhanced spreading features (>6 km) but without significant roots. Within the central East subbasin, the thin oceanic crust, only identified inside an 80 km wide zone, is located within an overall 150 km wide domain characterized by N055° seafloor spreading trends. The postspreading volcanoes were formed during a N‐S tensional episode around 6–10 Ma, several millions of years after seafloor spreading ceased in the SCS. Seafloor spreading (N055° and N145°) and postspreading (N000° and N090°) features are observed in the morphology of some of these volcanoes. The rupture of the brittle thin oceanic crust was focused where the crust was the weakest, i.e., at the intersection of the extinct spreading ridge with former fracture zones. From geological and geophysical arguments, we suggest that the postspreading volcanism might have been influenced by the Hainan plume activity through a buoyancy‐driven partial melting mechanism.

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