Variations of geothermometry and chemical-isotopic compositions of hot spring fluids in the Rehai geothermal field, southwestern China

Du, Jianguo; Liu, Cong‐Qiang; Fu, Bihong; Ninomiya, Yoshiki; Zhang, Youlian; Wang, Chuanyuan; Wang, Hualiu; Sun, Zigang

doi:10.1016/j.jvolgeores.2004.11.009

Cited by 102 publications

(58 citation statements)

References 30 publications

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“…These results indicate that the Tengchong volcano is not a hotspot associated with a deep mantle plume, it is more likely to be caused by the eastward subduction of the Burma microplate (or the Indian plate) and the hot and wet upwelling in the mantle wedge, similar to a back-arc volcano or the Changbai intraplate volcano (Lei et al 2009a;Zhao and Liu 2010). Petrologic and geochemical studies show that the Tengchong volcanics have origin in the upper mantle (Du et al 2005), supporting the tomographic results. The Hainan intraplate volcano in southernmost China (Fig.…”

Section: East Asian Hotspotssupporting

confidence: 70%

Hotspots and Mantle Plumes

Zhao

2015

Multiscale Seismic Tomography

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Seismic images under 62 possible hotspots are reviewed for understanding the origin of hotspots and mantle plumes. Plume-like, continuous low-velocity anomalies are visible beneath Hawaii, Tahiti, Louisville, Iceland, Cape Verde, Reunion, Kerguelen, Amsterdam, Afar, Eifel, Hainan, Yellowstone and Cobb hotspots, suggesting that they may be 13 whole-mantle plumes originating from the core-mantle boundary. These plumes exhibit tilted images, suggesting that plumes are not fixed in the mantle but can be deflected by the mantle flow. Upper-mantle plumes seem to exist beneath Cameroon, Easter, Azores, Vema, East Australia and Erebus hotspots. A mid-mantle plume may exist under the San Felix hotspot. Active intraplate volcanoes in Northeast Asia and Southwest China are caused by hot and wet upwelling flows in the big mantle wedge above the stagnant slab in the mantle transition zone. Although low-velocity zones appear at some depth under other hotspots, their plume features are not clear. The complex images under hotspots reflect strong lateral variations in temperature, viscosity and possibly composition of the mantle, which control the generation and ascent of mantle plumes and the flow pattern of mantle convection.

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Section: East Asian Hotspotssupporting

confidence: 70%

Hotspots and Mantle Plumes

Zhao

2015

Multiscale Seismic Tomography

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“…Active geothermal systems at Tengchong are well known (Tong and Zhang 1989;Huangpu and Jiang 2000;Du et al 2005), and a low-velocity layer at a depth of 3-10 km, identified by seismic sounding data, and earthquake results (Qin et al 2000;Bai et al 2002;Zhao et al 2006) are consistent with the presence of magma chambers in the upper crust.…”

Section: Staging Magma Chambersmentioning

confidence: 83%

Heterogeneous mantle source and magma differentiation of quaternary arc-like volcanic rocks from Tengchong, SE margin of the Tibetan Plateau

Zhou

Robinson

Wang

et al. 2011

Contrib Mineral Petrol

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The Tengchong volcanic field north of the Burma arc comprises numerous Quaternary volcanoes in the southeastern margin of the Tibetan Plateau. The volcanic rocks are grouped into four units (1-4) from the oldest to youngest. Units 1, 3 and 4 are composed of olivine trachybasalt, basaltic trachyandesite and trachyandesite, and Unit 2 consists of hornblende dacite. The rocks of Units 1, 3, and 4 form a generally alkaline suite in which the rocks plot along generally linear trends on Harker diagrams with only slight offset from unit to unit. They contain olivine phenocrysts with Fo values ranging from 65 to 85 mol% and have Cr-spinel with Cr# ranging from 23 to 35. All the rocks have chondrite-normalized REE patterns enriched in LREE and primitive mantlenormalized trace element patterns depleted in Ti, Nb and Ta, but they are rich in Th, Ti and P relative to typical arc volcanics. Despite minor crustal contamination, 87 Sr/ 86 Sr ratios (0.706-0.709), eNd values (-3.2 to -8.7), and eHf values (?4.8 to -6.4) indicate a highly heterogeneous mantle source. The Pb isotopic ratios of the lavas ( 206 Pb/ 204 Pb = 18.02-18.30) clearly show an EMI-type mantle source. The underlying mantle source was previously modified by subduction of the Neo-Tethyan oceanic and Indian continental lithosphere. The present heterogeneous mantle source is interpreted to have formed by variable additions of fluids and sediments derived from the subducted Indian Oceanic lithosphere, probably the Ninety East Ridge. Magma generation and emplacement was facilitated by transtensional NS-trending strike-slip faulting.

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“…Tectonically, this area lies at the eastern end of the Tibet-Yunnan geothermal zone (Kearey and Wei, 1993). Quaternary volcanoes and faults are the most conspicuous geologic features in the area (Du et al, 2005;Shangguan et al, 2005). In general, the geothermal surface manifestations (e.g.…”

Section: Site Descriptionmentioning

confidence: 99%

“…The release of these waters into the surrounding environment may not only raise concern about the aquatic ecology (Mroczek, 2005), but could also pose a health risk to local residents (Webster, 1999;Robinson et al, 2003). Tengchong County, located in Yunnan Province, southwestern China, is a famous volcanic area that has abundant geothermal resources associated with the volcanic processes (Gao and Fan, 1992;Xu et al, 1997;Du et al, 2005), including the well-known hot springs of the Rehai and Ruidian geothermal fields.…”

Section: Introductionmentioning

confidence: 99%