Mineralogy of Weathered Basalt Crust in West Volynya

Shashkina, V. P.

doi:10.1080/00206816109473598

Cited by 2 publications

(1 citation statement)

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“…For example, the results of the present investigation leave little doubt that celadonite or proto-celadonite is the primary repository for B in oceanic crust altered by seawater at relatively low temperatures. Shaskina (1961) described the formation of celadonite veins in altered basalt as the process of "joint coagulation of Fe 2 O 3 , A1 2 O 3 , and SiO 2 from colloidal solutions saturated with alkalies." This seems like a reasonable explanation for celadonite formation in DSDP basalt, where, as noted previously, celadonite is typically associated with ferric oxide and characterizes alteration under relatively oxidizing conditions.…”

Section: Rbmentioning

confidence: 99%

B, Li, and Associated Trace Element Chemistry of Alteration Minerals, Holes 597B and 597C

Berndt¹,

Seyfried²

1986

Initial Reports of the Deep Sea Drilling Project

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B, Li, and other trace elements were analyzed in samples from 12 celadonite and smectite-rich veins from oxidative and non-oxidative alteration zones in basalts from Holes 597B and 597C. The oxidative alteration zones are characterized by celadonite and Fe-oxyhydroxide and conspicuously high K, Rb, and B concentrations. In contrast, the non-oxidative alteration zones are characterized by Mg-rich smectite (saponite), talc, and calcite and high Li concentrations. Neither B nor Li reaches high concentrations in high-Al high-Ti veins that appear to have formed by replacement of basalt. B, Li, and Rb enrichments in vein assemblages of low-temperature origin reflect an important removal mechanism from seawater for these species.The alteration zones characterized by Mg-smectite and talc are strikingly enriched in Ni. There is a correlation between the Ni-enriched smectite and the presence of olivine in the host basalt; the correlation indicates that olivine alteration may be the source of the Ni. Other transition elements, including Cr, Mn, Co, Cu, and Zn, are often found in significant concentrations in the celadonite and high-Mg smectite veins, but their enrichments are neither as large nor as consistent as the enrichment of Ni in the Mg-smectite veins.Two high-Al, high-Ti vein assemblages of smectite and noncrystalline phases have transition element abundances similar to those of the host basalts but are relatively depleted in Cu and Cr. The material in these veins may have formed by replacement with concomitant release of Cu and Cr to circulating aqueous fluids.

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Section: Rbmentioning

confidence: 99%