The Keelung Submarine Volcano in the near-shore area of northern Taiwan and its tectonic implication

Tsai, Chia-Wei; Hsu, Shu Kun; Lin, Shih Chang; Yang, Tsanyao Frank; Wang, Shiou Ya; Doo, Wen Bin; Lee, Hsiao Fen; Lan, Tefang; Huang, Jian; Liang, Chin Wei

doi:10.1016/j.jseaes.2017.01.022

Cited by 11 publications

(4 citation statements)

References 21 publications

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“…New seismological evidence clearly indicates that a deep magma reservoir is beneath Taipei [42]. Also, increasing active submarine volcano, gas plumes, and topography lineaments have been identified in the offshore area [43][44][45]. To sum up, investigation on whether the volcanic activities are still potential threatening geohazards, along with the geophysical and geochemical monitoring on present-day activities, remains important.…”

Section: Late Neogene Basin Of North Offshore Taiwanmentioning

confidence: 99%

Seismic Stratigraphic Features of the Late Miocene-Present Unconformities and Related Seismic Units, Northern Offshore Taiwan

Chang¹,

Yang²,

Hsu³

et al. 2017

Seismic and Sequence Stratigraphy and Integrated Stratigraphy - New Insights and Contributions

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We investigate the seismic stratigraphic features offshore northern Taiwan by using newly collected multichannel seismic data. Two significant regional unconformities U1 and U2 have been identified, which further subdivide the sedimentary sequence into three seismic units as SU I, SU II, and SU III. The lowermost seismic unit SU I is a pre-late Miocene sequence, while the middle and upper seismic unit SU II and SU III result from the interactions between the rapid fault-controlled subsidence and the stable thermal-controlled subsidence. We consider that the present-day offshore northern Taiwan is under a post-collisional state and the unconformities U1 and U2 represent a response to the mountain collapse and to the cessation of the regional volcano-tectonic activities. It is not until 1.5 Ma that northern offshore Taiwan became a post-collisional basin and started to receive sediments, with a rapid fault-controlled subsidence. Afterward, the basin became dominated by a stable thermal-controlled subsidence at 0.2 Ma. Although the main volcano-tectonic activities in the northern offshore Taiwan are ceased, modern geophysical and geochemical investigations have suggested that the tectonism and the volcanism are still active and represent potential threatening geohazard.

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Section: Late Neogene Basin Of North Offshore Taiwanmentioning

confidence: 99%

Seismic Stratigraphic Features of the Late Miocene-Present Unconformities and Related Seismic Units, Northern Offshore Taiwan

Chang¹,

Yang²,

Hsu³

et al. 2017

Seismic and Sequence Stratigraphy and Integrated Stratigraphy - New Insights and Contributions

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“…the Pengjia Islet, Mianhu Islet, and Huaping Islet (Wang et al 1999). Additionally, the identified submarine volcanic features are currently increasing (Hsiao et al, 1998;Tsai et al, 2017;Chang et al, 2021). It began to form at 2.8 Ma, and was previously considered as the westernmost branch of the Ryukyu volcanic arc for it is calc-alkalie andesite similar to those observed in convergent setting (Chen 1990).…”

Section: Regional Magmatismmentioning

confidence: 99%

Post-collisional and volcanic features of the Late Miocene-Pleistocene foreland area, northern offshore Taiwan

Hsu¹,

Yang²,

Chang³

et al. 2021

Terr. Atmos. Ocean. Sci.

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Based on multichannel seismic data northern offshore Taiwan, we revisited the postcollisional and volcanic features in the Late Miocene-Pleistocene wedge-top of the early Taiwan orogenic wedge. Seismic data transverse to wedge-top zone show the asymmetric and symmetric folds, along with blind thrusts and back thrusts. Seismic data parallel to the axis of the wedge-top zone show the volcanic features of poor stratified reflectors, forced fold and intrusive step of volcanic sills along and away from dominating normal fault structures. Since the volcanic extrusions and normal faults are probably associated events, we suggest that post-collisional extensional volcanism northern offshore Taiwan was probably formed along inherited primary and secondary fault structures. The wedge-top zone was formed at frontal part of the early Taiwan orogenic wedge in Late Miocene. Subsequent change of regional stress from convergence to extension led to the mountain collapse as well as primary and secondary normal faults. Thus, these post-collisional normal faults are mechanically weak, probably capable of providing pathways for the Pleistocene-present volcanisms northern offshore Taiwan. The facilitation of post-collisional fault structures as transportation routes for deep material to migrate along may be important for the formation of the Quaternary volcanism extrusions northern offshore Taiwan.

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“…West of the Taipei Basin, the deformation front seems to run approximately along the Shanchiao Fault [23], an active normal fault with documented paleoearthquakes in the Taipei metropolis [24]. Along the northward extension of the Shanchiao Fault, the deformation front runs seemingly along the Chinshan Fault, which has an at-least 7 km extension observed in the underwater domain [25]. Farther north, the deformation front seems extended roughly along the shelf break, separating the continental shelf from the slope (Figures 1 and 3).…”

Section: Geological Setting 21 Regional Structurementioning

confidence: 99%

Igneous Activity and Structural Development of the Mianhua Terrace, Offshore North Taiwan

et al. 2021

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Using bathymetric and multichannel seismic (MCS) data, we explored the volcanic influence on the bathymetric and stratigraphic features of the Mianhua Terrace. The Mianhua Terrace occupies the marine counterpart of the Northern Taiwan Volcanic Zone (NTVZ) along the collapsed Taiwan orogenic wedge and is dominated by post-collisional magmatism and extensional structures. The bathymetric data showed several semicircular-shaped features near the shelf break. The MCS profiles showed that the Pleistocene unconformity buried beneath the Mianhua Terrace is partly difficult to observe due to seafloor multiples, suggesting that the seafloor is dominated by physically hard lithology, probably volcanic lavas. We interpreted the high-amplitude reflectors and their projected seafloor relief as intrusive sills and associated extrusive edifice. Similarly, we interpreted high-amplitude reflectors in the vicinity of normal faults as intrusive sills emplaced and facilitated by fault structures. A volcanic or hydrothermal mound was also recognized. We propose that the Mianhua Terrace is a breached ramp in a transfer zone between the tips of two successive normal faults along the shelf break. Once the fault tips reactivate and extend toward each other, the Mianhua Terrace may continue to collapse, leading to catastrophic volcanic or associated hydrothermal events.

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The Keelung Submarine Volcano in the near-shore area of northern Taiwan and its tectonic implication

Cited by 11 publications

References 21 publications

Seismic Stratigraphic Features of the Late Miocene-Present Unconformities and Related Seismic Units, Northern Offshore Taiwan

Seismic Stratigraphic Features of the Late Miocene-Present Unconformities and Related Seismic Units, Northern Offshore Taiwan

Post-collisional and volcanic features of the Late Miocene-Pleistocene foreland area, northern offshore Taiwan

Igneous Activity and Structural Development of the Mianhua Terrace, Offshore North Taiwan

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