Strike-slip faults offshore southern Taiwan: implications for the oblique arc-continent collision processes

Fuh, Shi-Chie; Liu, Char‐Shine; Lundberg, Neil; Reed, Donald L.

doi:10.1016/s0040-1951(96)00296-x

Cited by 35 publications

(24 citation statements)

References 19 publications

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“…1). The morphological expressions, structural characteristics and tectonic evolution of the incipient arc-continent collision zone offshore of southeastern Taiwan have been reported extensively (e.g., Chen and Juang 1986;Chen et al 1988;Huang et al 1992Huang et al , 1995Huang et al , 1997Lundberg et al 1992Lundberg et al , 1997Fuh et al 1997;Liu et al 1998;Malavieille et al 2002). Offshore of southwestern Taiwan, where the outgrowth of the submarine accretionary wedge extends westward to the China continental slope, prominent morphological features are anticlinal ridges and submarine canyons (Fig.…”

Section: Morphotectonic Featuresmentioning

confidence: 98%

Distribution and Characters of Gas Hydrate Offshore of Southwestern Taiwan

Liu¹,

Schnürle²,

Wang³

et al. 2006

Terr. Atmos. Ocean. Sci.

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108

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ABSTRACT1 Institute of Oceanography, National Taiwan University, Taipei, Taiwan, ROC 2 Central Geologic Survey, Taipei, Taiwan, ROC 3 Exploration Department, Chinese Petroleum Company, Miaoli, Taiwan, ROC * Corresponding author address: Prof. Char-Shine Liu, Institute of Oceanography, National Taiwan University, Taipei, Taiwan, ROC; E-mail: csliu@ntu.edu.tw Bottom simulating reflector (BSR) is a key indicator for the presence of gas hydrate beneath the sea floor. Widely distributed BSRs have been observed in the area offshore of southwestern Taiwan where the active accretionary complex meets with the passive China continental margin. In order to better understand the distribution and characters of the gas hydrate in the region, closely spaced (1.86-km line spacing) multichannel seismic reflection surveys have been conducted in recent years under the support of the Central Geological Survey, ROC. Over 10000 km of multichannel seismic reflection profiles have been collected that cover an area of about 10000 km 2 offshore of southwestern Taiwan. BSRs can be identified along 50% of the seismic profiles that we collected. A newly compiled BSR distribution map suggests that gas hydrates are distributed both in the passive margin of the China continental slope as well as in the submarine Taiwan accretionary wedge, from water depths of 500 to over 3000 m. Gas hydrates are most concentrated underneath anticlinal ridges in the accretionary wedge, and underneath the slope ridges of the passive continental margin that were formed due to sedimentary processes. Active fluid activities are evident from various features observed on seismic reflection and chirp sonar profiles, such as mud volcanoes, gas plumes and gas charged shallow sedimentary layers. Fluid migration model has been established from a set of pseudo 3D seismic reflection data. The predicted locations of high fluid Terr. Atmos. Ocean. Sci., Vol. 17, No. 4, December 2006 616 flux correlate well with those interpreted from geochemical analyses that show very high methane concentrations and very shallow sulfate-methane interfaces (SMI). This demonstrates the importance of structural control over gas hydrate emplacement. From the observed gas hydrate distribution and characters, the area offshore of southwestern Taiwan provides an ideal place to study and compare the formation and migration of gas hydrates under different tectonic settings.

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Section: Morphotectonic Featuresmentioning

confidence: 98%

Distribution and Characters of Gas Hydrate Offshore of Southwestern Taiwan

Liu¹,

Schnürle²,

Wang³

et al. 2006

Terr. Atmos. Ocean. Sci.

Self Cite

149

108

View full text Add to dashboard Cite

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“…In contrast, coeval fore-arc or accretionary prism units are rarely found in Taiwan, perhaps because they have been eroded away or overprinted by Cenozoic arc-continent collision with the Philippine Sea Plate (Ho, 1986;Fuh et al 1997;Chang et al 2001;Malavieille & Trullenque, 2009) and by eastward subduction of oceanic crust of the South China Sea since Early Miocene time (e.g. Huang et al 1997).…”

Section: Implications For the Geological Evolution Of Coastal Areas Imentioning

confidence: 99%

Geochronological, geochemical and Sr–Nd–Hf isotopic constraints on petrogenesis of Late Mesozoic gabbro–granite complexes on the southeast coast of Fujian, South China: insights into a depleted mantle source region and crust–mantle interactions

Qiu

2011

Geol. Mag.

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The Quanzhou (QZ) and Huacuo (HC) gabbro-granite complexes on the southeast coast of Fujian, South China, are important components of a Late Mesozoic calc-alkaline volcanic-plutonic belt in the region. The complexes provide an excellent opportunity to investigate the genetic relationships between acid and basic magmas, and their interactions within the intrusive environment. The complexes are composed mainly of monzogranite and biotite granodiorite in the QZ complex, and biotite granite in the HC complex, with lesser amounts of hornblende gabbro. Zircon U-Pb dating provides consistent crystallization ages of 109 ± 1 Ma and 108 ± 1 Ma for the QZ gabbros and monzogranites, and an age of 111 ± 1 Ma for the HC gabbro, which is contemporaneous with the spatially associated HC granites. Both the mafic and felsic intrusions in these complexes are enriched in light rare earth elements (LREEs) and large-ion lithophile elements (LILEs), and are depleted in high-field-strength elements (HFSEs; e.g. Nb and Ta). They show similarly homogeneous Sr-Nd isotopic compositions. All these factors indicate a close genetic relationship between the gabbroic and granitic rocks in the QZ and HC complexes. Although the enriched Sr-Nd isotopic signatures of the QZ and HC gabbros seemingly point to an enriched mantle source (EM-1), they have highly variable zircon Hf isotopic compositions, with ε Hf (t) values ranging from negative to positive (specifically -4.6 to +6.1 for the QZ gabbros and -4.8 to +11.6 for the HC gabbros). We interpret the parental basic magmas of these gabbros to have received contributions from a depleted mantle source and crustal components. Contributions from such a depleted mantle source resulted in the growth of juvenile basaltic lower crust, the partial melting of which generated the parental felsic magmas of the QZ and HC complexes. Furthermore, based on a synthesis of petrography, geochronology, elemental and isotopic geochemistry and tectonics, we propose that break-off and rollback of the Late Mesozoic subducted Palaeo-Pacific Plate triggered the upwelling of asthenospheric mantle below the coastal area of the South China Block, which induced extension of the overlying continental lithosphere, and finally initiated the large-scale Late Yanshanian magmatism in the study area.

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“…The Southern Longitudinal Trough (Fig. 4) is a proximal orogenic basin developed in a forearc position (e.g., Lundberg and Dorsey, 1988;Lundberg et al, 1997;Fuh et al, 1997). The trough is elongated in a north-south direction between 21Њ50ЈN and 22Њ40ЈN.…”

Section: Deformation In the Southern Structural Domainmentioning

confidence: 99%