Mineralogy and Chemistry of Secondary Phases in Low Temperature Altered Basalts from Deep Sea Drilling Project Legs 51, 52, and 53

Mével, Catherine

doi:10.2973/dsdp.proc.515253.153.1980

Cited by 21 publications

(22 citation statements)

References 10 publications

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“…Because of the lack of X-ray diffraction data we cannot precisely identify these clay minerals. But by comparing their chemistry and optical characteristics to other data (Bolhke et al, 1981;Honnorez et al, 1978;Mevel, 1980) we are able to assume that most of these clay minerals belong to the smectite group.…”

Section: Secondary Mineralsmentioning

confidence: 99%

Petrographical and Chemical Study of Basement Basalts from the Galapagos Spreading Center, Leg 70

Laverne¹,

Vivier²

1983

Initial Reports of the Deep Sea Drilling Project

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Section: Secondary Mineralsmentioning

confidence: 99%

Petrographical and Chemical Study of Basement Basalts from the Galapagos Spreading Center, Leg 70

Laverne¹,

Vivier²

1983

Initial Reports of the Deep Sea Drilling Project

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“…Since the hole was begun in 1979, secondary alteration has been studied by many researchers (Adamson, 1983;Alt et al, 1983Alt et al, , 1985Alt et al, , 1986Honnorez et al, 1983;Kurnosov et al, 1983;Noack et al, 1983;Boronikhin, 1983a, 1983b;Ishizuka, 1989;Bohlke, 1980;Hart, 1973;Mével, 1980). Their data were used, along with data from other deep-penetration holes in the oceanic basement (Bass, 1976;Pertsev and Rusinov, 1980;etc.…”

Section: Introductionmentioning

confidence: 99%

Metasomatic and Metamorphic Peculiarities of the Diabase Dike Alteration in Hole 504B, Leg 140

Pertsev¹,

Kurdyukov²

1996

Proceedings of the Ocean Drilling Program, 148 Scientific Results

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The diabase dikes recovered during Leg 140 display four types of mineralogical alteration: (1) chlorite + amphibole + titanite; (2) chlorite + amphibole + ilmenite; (3) epidote + prehnite + anhydrite; (4) zeolites + smectite. The first two types represent both background and vein alteration. The third and fourth types are locally overprinted on the previous types. The third type exhibits oxidative features, whereas the fourth formed with cooling of the dike complex. Some veins and patches of strong alteration are surrounded by infiltrate-metasomatic halos, which suggest a difference in fluid pressure in pores and fractures. The temperature of the main alteration types ranged between 350° and 400°C. Noticeable temperature fluctuations in space and time were caused by alternating heating and cooling resulting from intrusions of younger dikes within short time intervals.

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“…A complete understanding of the chemical fluxes involved in this process depends on knowing the duration of convection and the chemistry of the fluids and solid alteration phases that result from the seawater/basalt interaction. The chemistry of solid alteration phases has received considerable attention recently (e.g., Andrews, 1977;Böhlke et al, 1980;Honnorez et al, 1979;Humphris and Thompson, 1978a, b;Staudigel, Muehlenbachs, et al, 1981;Mevel, 1980;Pritchard, 1980;Robinson et al, 1977). The chemistry of the circulating fluids has been studied only in two areas of the ridge system where hot springs of fluids exit the crust (Edmond, Measures, Mangum, et al, 1979;Edmond, Measures, McDuff, et al, 1979;Edmond, 1981); the fluids were sampled directly during both studies.…”

Section: Introductionmentioning

confidence: 99%

Alkali and Sr Isotope Geochemistry of Waters Collected from Basaltic Basement, Deep Sea Drilling Project Hole 504B, Costa Rica Rift

Hart¹,

Mottl²

1983

Initial Reports of the Deep Sea Drilling Project

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Basalt formation waters collected from Hole 504B at sub-basement depths of 194,201, 365, and 440 Sr is depleted by 0.8%. The Sr/Ca ratio of the formation water (0.0057) is much lower than that of seawater (0.018) but is similar to the submarine hot spring waters from the Galapagos Rift and East Pacific Rise and to geothermal brines from Iceland. At the intermediate temperatures represented by the Hole 504B formation waters (70°-105°C), the interaction between seawater and the ocean crust produces large solution enrichments in Ca, the addition of a significant basalt Sr isotope component accompanied by only a minor elemental Sr component, and the removal from solution of seawater K. The Rb, Cs, and Ba contents of the formation waters appear to be affected by contamination, possibly from drilling muds.

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Mineralogy and Chemistry of Secondary Phases in Low Temperature Altered Basalts from Deep Sea Drilling Project Legs 51, 52, and 53

Cited by 21 publications

References 10 publications

Petrographical and Chemical Study of Basement Basalts from the Galapagos Spreading Center, Leg 70

Petrographical and Chemical Study of Basement Basalts from the Galapagos Spreading Center, Leg 70

Metasomatic and Metamorphic Peculiarities of the Diabase Dike Alteration in Hole 504B, Leg 140

Alkali and Sr Isotope Geochemistry of Waters Collected from Basaltic Basement, Deep Sea Drilling Project Hole 504B, Costa Rica Rift

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