Minerals of the Clay Fraction in Pliocene-Quaternary Sediments of the East Equatorial Pacific

Rateev, Mikhail A; Timofeev, Pyotr P; Rengarten, N.V.

doi:10.2973/dsdp.proc.54.109.1980

Cited by 10 publications

(11 citation statements)

References 8 publications

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“…The curve is similar to that given by Rateev et al (1980) for K-, Fe-smectites from the Galapagos geothermal field.…”

Section: M6ssbauer Spectroscopysupporting

confidence: 69%

“…The KL9 nontronite contains significant amounts of interlayer K +, like many other hydrothermal nontronires; it may therefore represent a transition stage in the "celadonitization" process of the smectite by adsorption of K from seawater, as suggested by Rateev et al (1980). The 875r/S6Sr ratio obtained for sample KL9 was 0.71157 + 0.0002, considerably larger than the value of 0.70907 characteristic of modern seawater (Burke et aL, 1982).…”

Section: Nontronite Formationmentioning

confidence: 85%

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Nontronite in a Deep-Sea Core from the South Pacific

Singer

Stoffers

Heller-Kallai

et al. 1984

Clays and clay miner.

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Abstract--Smectite close to the pure Fe end member of the nontronite-beidellite series was found in the fine clay separated from a 354-cm deep sediment core in the southwestern Pacific Basin. The mineral has a b-axis of 9.09/~ and an unusually low dehydroxylation temperature of 454~ and is composed of sheaves of fibers less than 50/~ wide. Its charge density is 5.09 x 10 -4 esu/cmL The charge originates mainly from the presence of 18% of the total Fe in tetrahedral positions, as determined by Mrssbauer analysis. Slight deviations of the infrared spectra from those reported for nontronites are probably due to the presence of more octahedral Mg. The presence of authigenic quartz in the same sample permits some speculation on the concentration of dissolved silicon during nontronite genesis. A 6~80 value of 26 + 0.3%o indicates a temperature of formation of about 22~ The Sr isotope ratio suggests that the nontronite formed at least 12 million years ago.

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“…The curve is similar to that given by Rateev et al (1980) for K-, Fe-smectites from the Galapagos geothermal field.…”

Section: M6ssbauer Spectroscopysupporting

confidence: 69%

Section: Nontronite Formationmentioning

confidence: 85%

Nontronite in a Deep-Sea Core from the South Pacific

Singer

Stoffers

Heller-Kallai

et al. 1984

Clays and clay miner.

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“…5, 5O3A-101.44 m) is distinctly different from those of the Caribbean sites. The 17 Å peak for smectite (glycolated) is broad and low, suggesting poor crystalUnity, a high degree of mixed layering, or the presence of a ferruginous smectite (nontronite; Rateev et al, 1980). Additionally, the broad, diffuse reflection band (15-25 °2θ) of biogenic opal is always evident.…”

Section: Pacific Sedimentsmentioning

confidence: 99%

Lithologic Stratigraphy and Clay Mineralogy of the Western Caribbean and Eastern Equatorial Pacific, Leg 68, Deep Sea Drilling Project

Zimmerman¹

1982

Initial Reports of the Deep Sea Drilling Project

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Complete and virtually undisturbed sections of late Neogene and Quaternary sediment were recovered by the hydraulic piston corer from Leg 68 sites in the western Caribbean and eastern equatorial Pacific. Lithologic stratigraphy of Site 502 records the changing paleoceanography of the western Caribbean. Associated with the emergence Of the Isthmus of Panama is the weakening of the west-flowing Caribbean Current. This is reflected in an abrupt lithofacies change, with a marine authigenic-volcanic facies of late Miocene being replaced in the Pliocene by continental detritus of the Rio Magdalena. At Site 503, on the northern flank of the Galapagos Rise, almost the entire sediment section consists of a marine authigenic-hydrothermal facies.

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“…Iron in hydrothermal nontronitic smetites is mainly in an oxidized state (Rateev et al, 1980;Hoffert et al, 1980). However, the FeO concentrations in the smectites (Tables 1-3, 7-9) fluctuate from below the determina- tion limit to greater than 3%.…”

Section: Major Elementsmentioning

confidence: 99%

“…Rateev et al (1980) have shown that the green hydrothermal clays are the K-Fe smectites close to nontronite. Smectite can be defined "as a mixed-layer mineral in which typically montmorillonitic spaces filled with hydroxyl ions alternate with spaces filled with potassium."…”

Section: Major Elementsmentioning

confidence: 99%