Temporal variations of gas compositions of fumaroles in the Tatun Volcano Group, northern Taiwan

Lee, Hsiao-Fen; Yang, T. F.; Lan, Tefang; Chen, Cheng-Hong; Song, Sheng-Rong; Tsao, Shuhjong

doi:10.1016/j.jvolgeores.2008.06.005

Cited by 55 publications

(63 citation statements)

References 47 publications

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“…However, higher sulfur isotopic ratio suggests that the influence of magmatic fluids does not really change the volcanic affinity of these samples. According to the sulfur and helium isotopic values of volcanic gas of the TVG (Ho 2001;Yang et al 2003;Lee et al 2008;Ohba, et al 2010) as well as the regional geology, we can conclude that the reservoir is located in the sedimentary terrane.…”

Section: Origin Of Type III Thermal Watermentioning

confidence: 87%

“…High heat flows with geothermal gradients higher than 100°C km -1 were detected through geothermal exploration between 1960s and 1970s (MRSO 1969(MRSO , 1970(MRSO , 1971(MRSO , 1973. Meanwhile, recent measurements of volcanic gases and 3 He/ 4 He ratios also show that an active magma chamber might still exist underneath the TVG Lee et al 2005Lee et al , 2008Lan et al 2007). The TVG, thus, is recognized as "an active volcano" in Taiwan based on numerous micro-earthquakes, high heat flow and abnormally high helium ratios (Song et al 2000a).…”

Section: Introductionmentioning

confidence: 99%

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Characteristics and Origins of Hot Springs in the Tatun Volcano Group in Northern Taiwan

Liu¹,

Song²,

Chen³

et al. 2011

Terr. Atmos. Ocean. Sci.

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This paper systematically surveyed distribution and field occurrences of 13 hot springs as well as geochemical investigation on the geothermal area of the Tatun Volcano Group (TVG). According to Piper diagrams, pH values, field occurrences and water-rock interactions, these hot springs can be classified into three types: (1) Type I, SO 4 2-acidic water where the reservoir is located in the Wuchishan Formation; (2) Type II, HCO 3 -a near neutral spring where waters originate from the volcanic terrane (andesite); and (3) Type III, Cl --rich acidic water where waters emanate from shallower Wuchishan Formation. In terms of isotopic ratio, δD and δ 18O values, two groups of hot spring can be recognized. One is far away from the meteoric water line of the Tatun area with values ranging between -26.2‰ and -3.5‰, and from -3.2‰ to 1.6‰, respectively. However, another close to the meteoric water line of the Tatun area is between -28.4‰ and -13.6‰, and from -5.5‰ to -4.2‰, respectively. In addition, the δ 34 S value of thermal waters can also be distinguished into two groups, one ranging from 26.1‰ to 28.5‰, and the other between 0.8‰ and 7.8‰. Based on field occurrences and geochemical characteristics, a model has been proposed to illustrate the origin of these hot springs.

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Section: Origin Of Type III Thermal Watermentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Characteristics and Origins of Hot Springs in the Tatun Volcano Group in Northern Taiwan

Liu¹,

Song²,

Chen³

et al. 2011

Terr. Atmos. Ocean. Sci.

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“…However, previous geophysical observations have shown that in addition to siliciclastic sediments, andesitic intrusions were also found at several places offshore northern Taiwan [39]. Recent observations about volcanic activities suggest that there are even younger, Holocene volcanic events in the NTVZ area, and hydrothermal activities in the Tatun Volcanic Group area are still very common at present [40,41]. New seismological evidence clearly indicates that a deep magma reservoir is beneath Taipei [42].…”

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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“…Although the group has not had any historical eruptions, its volcanic edifices are well-preserved and are dotted by multiple hot springs and solfataras with temperatures up to 116°C (Witt et al, 2008). Detailed investigations undertaken in recent years have provided several lines of evidence that an active magma chamber is present below the TVG: (1) compositions of gases from the TVG fumaroles indicate their origin from a magmatic source (Yang et al, 1999;Lee et al, 2005;Lee et al, 2008;Witt et al, 2008); (2) shallow-level seismicity similar to seismicity under active volcanoes has recently been observed (Lin et al, 2005;Kim et al, 2005;Konstantinou et al, 2007); and (3) geodetic measurements (leveling and GPS) reveal steady local ground deformations of the TVG, which may be caused by pressure changes at depth, possibly associated with migration of magma and/or hydrothermal fluids (Yu et al, 1997;Konstantinou et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Deposits, character and timing of recent eruptions and gravitational collapses in Tatun Volcanic Group, Northern Taiwan: Hazard-related issues

Belousov

Belousova

Chen

et al. 2010

Journal of Volcanology and Geothermal Research

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Keywords:extrusive eruption explosive eruption pyroclastic edifice collapse volcanic hazard Taiwan Taipei City, with a population of around 8 million, as well as two nuclear power plants is located in close proximity to the Quaternary, dominantly andesitic Tatun Volcanic Group (TVG) of Northern Taiwan. We have investigated the stratigraphy of the youngest volcaniclastic deposits, as well as the morphology of lava flows and domes of the TVG in order to reconstruct the character and timing of the most recent eruptions and related hazardous events in the area. Our data indicate that recent eruptions of the group were dominated by long-term, voluminous extrusions of crystal-rich, very viscous lavas. These eruptions formed closely spaced monogenetic domes and lava flows. Based on morphological parameters of the lava flows (thicknesses 80-150 m, lengths up to 5.6 km, and volumes up to 0.6 km 3 ), average rates of magma effusion ranged from 1 to 10 m 3 /s, eruption durations from 500 to 1800 days, and lava front speeds from 0.5 to 6 m/h. Explosive activity of TVG was diverse, ranging from weak phreatic to highly explosive (VEI 4) Plinian eruptions; vulcanian activity with deposition of lithic ashes was most common. Interaction of rising magma with ground water frequently occurred during the eruptions. This study presents the first radiocarbon dates of various volcaniclastic deposits of the TVG, which indicate that Cising, Siaoguanyin, and possibly Huangzuei volcanoes had magmatic eruptions in the period 13,000-23,000 years ago. In addition, Mt. Cising had a phreatic eruption 6000 years ago, and possibly an effusive eruption just before that. Gravitational collapses of volcanic edifices with volumes 0.01-0.1 km 3 and H/L 0.16-0.25 were also common. They occurred on intersections with tectonic faults and may have been triggered by seismic activity. The youngest collapses occurred at Mt. Siaoguanyin (23,000 BP) and Mt. Cising (6000 BP). It is concluded that the TVG should be considered volcanically active. The results of this study provide a basis for volcanic hazard assessment and mitigation in the area.

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Temporal variations of gas compositions of fumaroles in the Tatun Volcano Group, northern Taiwan

Cited by 55 publications

References 47 publications

Characteristics and Origins of Hot Springs in the Tatun Volcano Group in Northern Taiwan

Characteristics and Origins of Hot Springs in the Tatun Volcano Group in Northern Taiwan

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

Deposits, character and timing of recent eruptions and gravitational collapses in Tatun Volcanic Group, Northern Taiwan: Hazard-related issues

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