Initial chronology of a recently discovered hydrothermal field at 14°45′N, Mid-Atlantic Ridge

Lalou, Claude; Reyss, Jean Louis; Brichet, Évelyne; Krasnov, S. G.; Stepanova, T. V.; Cherkashev, G. A.; Markov, V. F.

doi:10.1016/s0012-821x(96)00190-2

Cited by 34 publications

(27 citation statements)

References 15 publications

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“…The outer brown oxidation layers of all samples were always removed (recommended by Lalou et al, 1996 andMünch et al, 2001) to avoid problems with contamination. For U and Th analysis, 2 to 4 g of the samples was dissolved in an HCl-HNO 3 mixture before a precisely weighed quantity of a spike ( 228 Th-232 U at equilibrium) was added.…”

Section: Methodsmentioning

confidence: 99%

“…By this, uranium is accumulated in the SMS deposits on the sea floor. Common uranium concentrations in SMS deposits range up to a few tens of ppm (Lalou et al, 1996;Kuznetsov et al, 2006;Kuznetsov and Maksimov, 2012).…”

Section: Th/u Dating Methodsmentioning

confidence: 99%

“…The first 230 Th/U ages of SMS deposits were determined from the East Pacific Rise (EPR) and the MidAtlantic Ridge (Lalou and Brichet, 1982, Lalou et al, 1986, 1988. Later, SMS deposits were dated from the Central Indian Ridge (Münch et al, 2001;Wang et al, 2012).…”

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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Section: Methodsmentioning

confidence: 99%

Section: Th/u Dating Methodsmentioning

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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“…These variations could be related to different sulfide ages, and it is regrettable that there are no age data for sulfides from the EHF. The age differences of sulfides from the LHF (3,900-60,000 years) (Lalou et al, 1996;Kuznetsov et al, 2006) are insufficient to cause a measurable radiogenic enrichment. We interpret the variations to be a reflection of differences in residence time of subsurface hydrothermal fluid.…”

Section: Variable Lead Isotopic Compositionsmentioning

confidence: 99%

Sulfur and lead isotopic compositions of massive sulfides from deep-sea hydrothermal systems: Implications for ore genesis and fluid circulation

Zeng

Chen

et al. 2017

Ore Geology Reviews

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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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Initial chronology of a recently discovered hydrothermal field at 14°45′N, Mid-Atlantic Ridge

Cited by 34 publications

References 15 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

Sulfur and lead isotopic compositions of massive sulfides from deep-sea hydrothermal systems: Implications for ore genesis and fluid circulation

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

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