Distribution of the bottom-simulating reflector in the offshore Taiwan collision zone

Chi, Wu‐Cheng; Reed, Don C.; Liu, C. S.; Lundberg, Neil; 張光學,

doi:10.31979/etd.7dnu-wq4v

Cited by 21 publications

(29 citation statements)

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“…The sedimentary facies shows that sediments of the wedge-top basin have been actively deformed into mud diapiric intrusions and a series of thrusts and folds, resulting in the irregular topography of the seafloor with alternating ridges and canyons (Yu and Chow 2001). Chi et al (1998) identified a gas hydraterelated BSR in the broad offshore area of southwestern Taiwan. Geochemical studies reported that the BSR is highly concentrated at the tops of ridges, where especially high methane concentrations exist in the bottom water (Chuang et al 2006).…”

Section: Location and Datamentioning

confidence: 99%

Velocity Structure in Marine Sediments with Gas Hydrate Reflectors in Offshore SW Taiwan, from OBS Data Tomography

Cheng¹,

Lee²,

Liu³

et al. 2006

Terr. Atmos. Ocean. Sci.

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In the fall of 2004, four profiles of a total length of about 80 km and 24 recovered Ocean Bottom Seismometers (OBSs) were acquired along offshore southwestern Taiwan. These profiles were oriented in E-W and N-S directions to map the velocity structure of sediments by modeling the vertical component of OBS data. The thickness of sedimentary layers ranges from a few hundred meters to about 2 km, with the largest thickness being found beneath ridges. The most striking feature in the velocity models along E-W profiles is the relatively high velocity wedges, extending from the seafloor to about 2 km in depth; these could be interpreted as a series of westward upthrust faults. The feature of relatively high P-wave velocity could be considered a result of local shallowing of the base of the gas hydrate stability zone, caused by ascending flows of deep fluids passing through the fault zone. In the N-S profiles, a dome-like high velocity structure was observed and could be associated with the phenomenon of hydrate/gas phase boundary fluctuation. After erosion, the sub-seafloor temperature gradient redistributes and results in the hydrate/gas phase boundary moving downward. The results obtained in this study show that tectonic control is an important factor in determining bottom-simulating reflector (BSR) distributions offshore of southwestern Taiwan.

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Section: Location and Datamentioning

confidence: 99%

Velocity Structure in Marine Sediments with Gas Hydrate Reflectors in Offshore SW Taiwan, from OBS Data Tomography

Cheng¹,

Lee²,

Liu³

et al. 2006

Terr. Atmos. Ocean. Sci.

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“…BSR has been reported in the seismic survey carried out in southwestern offshore Taiwan, indicating potential occurrences of gas hydrates (Chi et al 1998;Schnürle et al 1999;Liu et al 2006). Beyond this geophysical evidence, however, any geochemical information concerning the gas system may become important to support the presence of the gas hydrates.…”

Section: Introductionmentioning

confidence: 97%

Geochemical Study on Hydrocarbon Gases in Seafloor Sediments, Southwestern Offshore Taiwan - Implications in the Potential Occurrence of Gas Hydrates

Oung¹,

Lee²,

Lee³

et al. 2006

Terr. Atmos. Ocean. Sci.

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“…Widely distributed BSR have been observed beneath the seafloor in the offshore area of SW Taiwan (Chi et al , 1998; Liu et al , 2006); very high methane concentrations in the bottom sea water and in the pore fluid of the seafloor sediment have also been measured at many coring sites in the study area (Chuang et al , 2006), suggesting that gas hydrates are present beneath the seafloor. When the climate warms (e.g.…”

Section: Discussionmentioning

confidence: 99%

Comparison of sedimentary processes on adjacent passive and active continental margins offshore of SW Taiwan based on echo character studies

Chiu

Liu

2008

Basin Research

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Echo character recorded on Chirp sub-bottom sonar data from o¡shore of SW Taiwan was analysed to examine and compare the sedimentary processes of adjacent passive and active continental margin settings. Sea£oor echoes in the study area are classi¢ed into four types: (1) distinct echoes, (2) indistinct echoes, (3) hyperbolic echoes and (4) irregular echoes. Based on the mapped distribution of the echo types, the sedimentary processes o¡shore of SW Taiwan are di¡erent in the two tectonic settings. On the passive South China Sea (SCS) margin, slope failure is the main process on the upper continental slope, whereas turbidite deposits accumulate in the lower continental slope. In contrast, the submarineTaiwan orogenic wedge is characterized by ¢ll-and-spill processes in intraslope basins on the upper slope, and mass-transport deposits are observed in the canyons and on the lower Kaoping slope.This di¡erence is largely caused by the huge in£ux of terrigenous sediments into the submarineTaiwan orogenic wedge compared with the passive SCS continental margin. In the latter, loading and movement of theTaiwan orogenic wedge has had a signi¢cant e¡ect on the sea£oor morphology and has triggered retrogressive failures. Gas hydrate dissociation may have enhanced the slope failure processes at some locations.

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Distribution of the bottom-simulating reflector in the offshore Taiwan collision zone

Cited by 21 publications

References 0 publications

Velocity Structure in Marine Sediments with Gas Hydrate Reflectors in Offshore SW Taiwan, from OBS Data Tomography

Velocity Structure in Marine Sediments with Gas Hydrate Reflectors in Offshore SW Taiwan, from OBS Data Tomography

Geochemical Study on Hydrocarbon Gases in Seafloor Sediments, Southwestern Offshore Taiwan - Implications in the Potential Occurrence of Gas Hydrates

Comparison of sedimentary processes on adjacent passive and active continental margins offshore of SW Taiwan based on echo character studies

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