Massive sulfide ores of the northern equatorial Mid-Atlantic Ridge

Cherkashev, G. A.; Ivanov, V.N.; Bel’tenev, V. E.; Lazareva, L. I.; Rozhdestvenskaya, I. I.; Samovarov, M. L.; Poroshina, Irina; Sergeev, M. B.; Stepanova, T. V.; Dobretsova, I. G.; Kuznetsov, V. Yu.

doi:10.1134/s0001437013050032

Cited by 45 publications

(28 citation statements)

References 23 publications

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“…The samples 34L-92M-1 and 33L-41К-2 were not datable because they had a 230 Th/ 234 U AR >1.0 and contained 232 Th ( Table 1), indicating contamination with terrigenous material. 230 Th (dpm/g) 232 Th (dpm/g) 230 * -samples dated earlier (Shilov et al, 2012;Cherkashev et al, 2013). 230 Th/U age vs the 238 U specific activity for SMS samples from the Peterburgskoye hydrothermal field confirms closed system conditions with regard to U.…”

Section: Isotopic and Dating Resultsmentioning

confidence: 82%

“…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%

“…Such geochemical features are typical for hydrothermal sulfide ores associated with basalts. Cherkashev et al (2013) have already presumed that the accumulated ore mass increases with age. Our results confirmed the oldest ages of Peterburgskoye field and allowed us to assume that the main ore bodies within this field are most likely buried under sediments and still remain undiscovered.…”

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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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Section: Isotopic and Dating Resultsmentioning

confidence: 82%

Section: Geological Setting and Field De-scriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…The periodic hydrothermal activity at Duanqiao may be related to the heat source provided by the local interaction of magmatism and tectonism. Cherkashev et al (2013) compared data on the size and age of ore fields from MAR and suggested that the time parameter is crucial for the scale of ore formation. Jamieson et al (2014) plotted the minimum ages of the deposit and the mass accumulation rates and indicated that the accumulation rates of inactive hydrothermal fields are lower than those of most active sulfides.…”

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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Development and evolution of detachment faulting along 50 km of the Mid‐Atlantic Ridge near 16.5°N

Smith

Schouten

Dick

et al. 2014

Geochem Geophys Geosyst

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A multifaceted study of the slow spreading Mid-Atlantic Ridge (MAR) at 16.5 N provides new insights into detachment faulting and its evolution through time. The survey included regional multibeam bathymetry mapping, high-resolution mapping using AUV Sentry, seafloor imaging using the TowCam system, and an extensive rock-dredging program. At different times, detachment faulting was active along 50 km of the western flank of the study area, and may have dominated spreading on that flank for the last 5 Ma. Detachment morphologies vary and include a classic corrugated massif, noncorrugated massifs, and back-tilted ridges marking detachment breakaways. High-resolution Sentry data reveal a new detachment morphology; a low-angle, irregular surface in the regional bathymetry is shown to be a finely corrugated detachment surface (corrugation wavelength of only tens of meters and relief of just a few meters). Multiscale corrugations are observed 2-3 km from the detachment breakaway suggesting that they formed in the brittle layer, perhaps by anastomosing faults. The thin wedge of hanging wall lavas that covers a lowangle (6 ) detachment footwall near its termination are intensely faulted and fissured; this deformation may be enhanced by the low angle of the emerging footwall. Active detachment faulting currently is limited to the western side of the rift valley. Nonetheless, detachment fault morphologies also are present over a large portion of the eastern flank on crust >2 Ma, indicating that within the last 5 Ma parts of the ridge axis have experienced periods of two-sided detachment faulting.

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Massive sulfide ores of the northern equatorial Mid-Atlantic Ridge

Cited by 45 publications

References 23 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

Development and evolution of detachment faulting along 50 km of the Mid‐Atlantic Ridge near 16.5°N

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