New hydrothermal ore fields in the Mid-Atlantic Ridge: Zenith-Victoria (20°08′ N) and Petersburg (19°52′ N)

Шилов, В. В.; Bel’tenev, V. E.; Ivanov, V.N.; Cherkashev, G. A.; Rozhdestvenskaya, I. I.; Габлина, И. Ф.; Dobretsova, I. G.; Narkevskii, E. V.; Gustaitis, A. N.; Kuznetsov, V. Yu.

doi:10.1134/s1028334x12010308

Cited by 18 publications

(14 citation statements)

References 3 publications

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“…Six SMS mounds (No. I-VI) were revealed within this field (Shilov et al, 2012). Unexpectedly, an old age of 59 36 176 + − ka was determined for one sample studied.…”

Section: Introductionmentioning

confidence: 95%

“…The highest content of these minerals had the sulfide crust 33L-41К-2; a high content of opal-like quartz had sample 34L-95M. (Shilov et al, 2012). Inset map shows SMS distribution along the 12°50 '-20°10'N segment of the MAR.…”

Section: Sample Descriptionmentioning

confidence: 99%

“…It has the largest distance among all other hydrothermal fields from the rift axis of the MAR. The geological and field description is given in publications by Shilov et al (2012) and Cherkashev et al (2013).…”

Section: Geological Setting and Field De-scriptionmentioning

confidence: 99%

“…Recently Shilov et al (2012) and Cherkashev et al (2013) obtained 230 Th/U ages of sulfides from the Peterburgskoye hydrothermal field at the MAR discovered during the cruise 33 of R/V "Professor Logatchev" at 19°52'N, 45°52'W in 2010. Six SMS mounds (No.…”

Section: Introductionmentioning

confidence: 99%

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The oldest seafloor massive sulfide deposits at the Mid-Atlantic Ridge: <sup>230</sup>Th/U chronology and composition

et al. 2015

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A geochronological and geochemical study on 10 samples of seafloor massive sulfides (SMS) from the inactive Peterburgskoye hydrothermal field at the Mid-Atlantic Ridge (MAR) was carried out. The 230 Th/U ages of the SMS are the oldest for the Quaternary hydrothermal ores ever found at the ocean floor. According to them the hydrothermal activity at Peterburgskoye field started at least 170 ka and continued down to 63 ka. The oldest hydrothermal ores from this field consist mainly of pyrite and chalcopyrite and have geochemical properties typical for SMS associated with basalts.

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“…Six SMS mounds (No. I-VI) were revealed within this field (Shilov et al, 2012). Unexpectedly, an old age of 59 36 176 + − ka was determined for one sample studied.…”

Section: Introductionmentioning

confidence: 95%

Section: Sample Descriptionmentioning

confidence: 99%

Section: Geological Setting and Field De-scriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The oldest seafloor massive sulfide deposits at the Mid-Atlantic Ridge: <sup>230</sup>Th/U chronology and composition

et al. 2015

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“…The ages of 270 sulfides from other mid-oceanic ridge(MOR) sites range from \10 yrs to 200 kyrs. The majority of older sulfides (with ages greater than *10 kyrs) are from the SWIR (Münch et al 2001), CIR (Lalou et al 1998a, b;Wang et al 2012), MAR Cherkashov et al 2010;Lalou et al 1993Lalou et al , 1996Shilov et al 2012) (Table 2; Fig. 7).…”

Section: Episodes Of Hydrothermal Activitymentioning

confidence: 99%

230Th/238U dating of hydrothermal sulfides from Duanqiao hydrothermal field, Southwest Indian Ridge

Yang

Tao

et al. 2016

Mar Geophys Res

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Duanqiao hydrothermal field is located between the Indomed and Gallieni fracture zones at the central volcano, at 50°28 0 E in the ultraslow-spreading Southwest Indian Ridge (SWIR). Twenty-eight subsamples from a relict chimney and massive sulfides were dated using the 230 Th/ 238 U method. Four main episodes of hydrothermal activity were determined according to the restricted results: 68. 9-84.3, 43.9-48.4, 25.3-34.8, and 0.7-17.3 kyrs. Hydrothermal activity of Duanqiao probably started about 84.3 (±0.5) kyrs ago and ceased about 0.737 (±0.023) kyrs ago. The periodic character of hydrothermal activity may be related to the heat source provided by the interaction of local magmatism and tectonism. The estimated mean growth rate of the sulfide chimney is \0.02 mm/yr. This study is the first to estimate the growth rate of chimneys in the SWIR. The maximum age of the relict chimney in Duanqiao hydrothermal filed is close to that of the chimneys from Mt. Jourdanne (70 kyrs). The hydrothermal activity in Dragon Flag field is much more recent than that of Duanqiao or Mt. Jourdanne fields. The massive sulfides are younger than the sulfides from other hydrothermal fields such as Rainbow, Sonne and Ashadze-2. The preliminarily estimated reserves of sulfide ores of Duanqiao are approximately 0.5-2.9 million tons.

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Sulfide geochronology along the Endeavour Segment of the Juan de Fuca Ridge

Jamieson

Hannington

Clague

et al. 2013

Geochem Geophys Geosyst

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[1] Forty-nine hydrothermal sulfide-sulfate rock samples from the Endeavour Segment of the Juan de Fuca Ridge, northeastern Pacific Ocean, were dated by measuring the decay of 226 Ra (half-life of 1600 years) in hydrothermal barite to provide a history of hydrothermal venting at the site over the past 6000 years. This dating method is effective for samples ranging in age from $200 to 20,000 years old and effectively bridges an age gap between shorter-and longer-lived U-series dating techniques for hydrothermal deposits. Results show that hydrothermal venting at the active High Rise, Sasquatch, and Main Endeavour fields began at least 850, 1450, and 2300 years ago, respectively. Barite ages of other inactive deposits on the axial valley floor are between $1200 and $2200 years old, indicating past widespread hydrothermal venting outside of the currently active vent fields. Samples from the halfgraben on the eastern slope of the axial valley range in age from $1700 to $2925 years, and a single sample from outside the axial valley, near the westernmost valley fault scarp is $5850 6 205 years old. The spatial relationship between hydrothermal venting and normal faulting suggests a temporal relationship, with progressive younging of sulfide deposits from the edges of the axial valley toward the center of the rift. These relationships are consistent with the inward migration of normal faulting toward the center of the valley over time and a minimum age of onset of hydrothermal activity in this region of 5850 years.

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New hydrothermal ore fields in the Mid-Atlantic Ridge: Zenith-Victoria (20°08′ N) and Petersburg (19°52′ N)

Cited by 18 publications

References 3 publications

The oldest seafloor massive sulfide deposits at the Mid-Atlantic Ridge: <sup>230</sup>Th/U chronology and composition

The oldest seafloor massive sulfide deposits at the Mid-Atlantic Ridge: <sup>230</sup>Th/U chronology and composition

230Th/238U dating of hydrothermal sulfides from Duanqiao hydrothermal field, Southwest Indian Ridge

Sulfide geochronology along the Endeavour Segment of the Juan de Fuca Ridge

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