U–Th radioactive disequilibrium and ESR dating of a barite-containing sulfide crust from South Mariana Trough

Takamasa, Asako; Nakai, S.; Sato, Fumihiro; Toyoda, Shin; Banerjee, Debabrata; Ishibashi, Jun-ichiro

doi:10.1016/j.quageo.2012.12.002

Cited by 22 publications

(34 citation statements)

References 21 publications

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“…34;Toyoda et al 2012), and (2) uranium-thorium disequilibrium dating (U-Th dating) was applied to hydrothermal sulfide minerals consisting mainly of pyrite and sphalerite (Ishibashi et al Chap. 23;Takamasa et al 2013). Both methods applied to the samples from the southern Mariana Trough generally showed good agreement in their ages (Fig.…”

Section: Introductionmentioning

confidence: 73%

“…However, the upper limit of the range of this dating method is limited to 4.0 Â 10 5 years, which is around eight times the half life of the daughter: 230 Th. Detailed protocols of U-Th dating were reported by Takamasa et al (2013). We analyzed uranium and thorium isotope ratios in mineral specimens using a Multicollector-ICP-MS (IsoProbe; GV Instruments Ltd.).…”

Section: Introductionmentioning

confidence: 99%

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Evaluating Hydrothermal System Evolution Using Geochronological Dating and Biological Diversity Analyses

Kumagai

Watanabe

Yahagi

et al. 2014

Subseafloor Biosphere Linked to Hydrothermal Systems

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To elucidate the evolution of hydrothermal activities, we conducted an interdisciplinary study including geochemistry and biology to develop a method of obtaining reliable age information. As geochemical dating techniques, two methods applicable for hydrothermal ore minerals were developed and improved: electron spin resonance method and uranium-thorium disequilibrium method. Cross checks between the two methods generally showed good agreement for the range of hundreds to thousands of years. As biological analysis, the biodiversity among faunal communities in the targeted areas was analyzed at the species and DNA levels. Species and genetic diversity of the local fauna were not always correlated to geochemical dating, either in the southern Mariana Trough region or in the Okinawa Trough region. Although the results are not simple, comparison of age information obtained from analyses of these two disciplines potentially provides important constraints for discussion of the history and evolution of hydrothermal activities.

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Section: Introductionmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Evaluating Hydrothermal System Evolution Using Geochronological Dating and Biological Diversity Analyses

Kumagai

Watanabe

Yahagi

et al. 2014

Subseafloor Biosphere Linked to Hydrothermal Systems

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“…Seafloor massive sulfides formed in the subductionrelated arc and backarc environments have attracted the attention of economic geologists since these hydrothermal fields are considered to be modern analogues of volcanogenic massive sulfide deposits on land (e.g., Fouquet et al 1993). Detailed geophysical, geomorphological, geological, mineralogical, geochemical and microbiological analyses of seafloor hydrothermal systems in the Southern Mariana Trough have been carried out within the past 20 years (e.g., Fryer 1995;Ishibashi and Urabe 1995;Ishibashi et al 2006;Kakegawa et al 2008;Kato et al 2009;Yoshikawa et al 2012;Nakamura et al 2013;Takamasa et al 2013;Ishibashi et al Chap. 23).…”

Section: Introductionmentioning

confidence: 99%

Mineralogical and Geochemical Characteristics of Hydrothermal Minerals Collected from Hydrothermal Vent Fields in the Southern Mariana Spreading Center

Ikehata

Suzuki

Shimada

et al. 2014

Subseafloor Biosphere Linked to Hydrothermal Systems

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Seafloor hydrothermal mineralization of four active hydrothermal fields (Snail, Yamanaka, Archaean and Pika sites) in the Southern Mariana Trough was investigated to clarify the mineralogical and geochemical characteristics of the hydrothermal minerals. The Snail site and the Yamanaka site are located on the crest of the backarc spreading ridge (on-axis). The Pika site sits atop an off-axial volcano, 4.9 km distant from the spreading axis, while the Archaean site sits on the flank of the spreading ridge, about 1.5 km distant from the axis. In the four hydrothermal sites, chimney and mound sulfides are composed mainly of pyrite, marcasite, sphalerite and chalcopyrite. Conduits and interstices of these sulfide minerals are filled with late barite and anhydrite. Mineralizations of off-axial hydrothermal fields have mineralogical and geochemical signatures (Fe-rich and low f S2 condition) similar to those of mineralizations at sediment-free mid-ocean ridge settings. By contrast, mineralizations of on-axial sites show distinctly Zn and Pb-rich (high f S2 condition) signatures similar to those found in arc or rifting settings. Sulfur isotopic compositions of collected sulfide minerals show a similar diversity with a mid-ocean ridge range for the off-axial sites and an island-arc range for the on-axial sites. These isotopic signatures could be explained by varying proportions of magmatic sulfur leached from the underlying volcanic rocks and reduced seawater sulfates. Keywords

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“…Tivey 2007). Takamasa et al (2013) determined ESR ages for barite in sulfide deposits in the South Mariana Trough hydrothermal field, and concluded that the ages are consistent with U-Th ages. In this study, the ages of various hydrothermal sulfides in the Okinawa Trough are determined by ESR dating.…”

Section: Introductionmentioning

confidence: 91%

ESR Dating of Barite in Sea-Floor Hydrothermal Sulfide Deposits in the Okinawa Trough

Fujiwara

Toyoda

Uchida

et al. 2014

Subseafloor Biosphere Linked to Hydrothermal Systems

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ESR (electron spin resonance) ages were determined for barite crystals extracted from hydrothermal sulfide deposits taken at Daiyon-Yonaguni Knoll field, Hatoma Knoll field, Iheya North Knoll field, Hakurei Site of Izena Hole field, Yoron Hole field of the Okinawa Trough. The ages range from 4.1 to 16,000 years, being consistent with detection of 228 Ra in younger samples and radioactive equilibrium/disequilibrium between radium and daughter nuclei. The variation of the ages within each sample is mostly within the statistical error range. The relative order of the ages is consistent with the result of 226 Pb method, but the determining absolute ages is still an issue. The order of ages of the 5 hydrothermal fields would be arranged, from young to old as follows; Yoron Hole field, Daiyon-Yonaguni Knoll field, Hatoma Knoll field, being nearly equal to Iheya North Knoll field. KeywordsBarite Dating Electron spin resonance Hydrothermal activities IntroductionThere have been many scientific efforts devoted for studies on active sea-floor hydrothermal fields found in Okinawa Trough (Ishibashi et al. Chap. 23). The evolution of these hydrothermal fields is one of the important issues. Dating methods have been employed for hydrothermal sulfide deposits, such as the U-Th disequilibrium method (e.g. You and Bickle 1998) applicable for the age range more than several thousand years, and 226 Pb and 228 Th method (e.g. Noguchi et al. 2011) for the range less than 150 years. The age range of several hundred years is essential to estimate the life time of hydrothermal activities. However, dating methods for the age range are lacking. Okumura et al. (2010) made the first practical application of ESR dating technique to a sample of seafloor hydrothermal barite to obtain ages of 300 and 3,620 years, while Kasuya et al. (1991) first pointed out that barite can be used for ESR dating. Toyoda et al. (2011) determined the optimum ESR condition while Sato et al. (2011) confirmed that the signal is thermally stable enough for an age range of several thousand years.Seafloor massive sulfide deposits are composed of sulfide minerals such as pyrite, sphalerite, chalcopyrite and galena, and also include sulfate minerals such as anhydrite and barite. The sulfate minerals precipitate by mixing of hydrothermal fluid and seawater, while the sulfide minerals precipitate from the hydrothermal fluid mainly by cooling (Hannington et al. 1995). It is generally considered that a combination and/or switch of these two modes of hydrothermal precipitation lead to growth of sulfide structures such as a chimney and mound and that of large hydrothermal T. Fujiwara S. Toyoda (*) A. Uchida Okayama University of Science, Okayama, Japan e-mail: toyoda@dap.ous.ac.jp deposits (e.g. Tivey 2007). Takamasa et al. (2013) determined ESR ages for barite in sulfide deposits in the South Mariana Trough hydrothermal field, and concluded that the ages are consistent with U-Th ages. In this study, the ages of various hydrothermal sulfides in the Okinawa Trough a...

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U–Th radioactive disequilibrium and ESR dating of a barite-containing sulfide crust from South Mariana Trough

Cited by 22 publications

References 21 publications

Evaluating Hydrothermal System Evolution Using Geochronological Dating and Biological Diversity Analyses

Evaluating Hydrothermal System Evolution Using Geochronological Dating and Biological Diversity Analyses

Mineralogical and Geochemical Characteristics of Hydrothermal Minerals Collected from Hydrothermal Vent Fields in the Southern Mariana Spreading Center

ESR Dating of Barite in Sea-Floor Hydrothermal Sulfide Deposits in the Okinawa Trough

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