Precipitation of deep-sea palygorskite and sepiolite

Bowles, Frederick A.; Angino, Ernest A.; Hosterman, John W.; Galle, O. K.

doi:10.1016/0012-821x(71)90187-7

Cited by 52 publications

(20 citation statements)

References 6 publications

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“…Nonetheless, it differs in one respect from other palygorskites in the literature. Notably, the basal reflection (110) for our material is at about 11.0Å on the average, whereas it normally occurs at 10.5-10.6Å (Table 3; Grim, 1968;Bowles et al, 1971;Weaver and Pollard, 1973). The very similar mineral, sepiolite, exhibits a basal peak at 12.0-12.3 Å (Grim, 1968); therefore the Hole 459B material is somewhat intermediate between reported palygorskite and sepiolite with respect to the position of the basal peak.…”

Section: X-ray Diffraction Characteristics and Composition Of Palygormentioning

confidence: 79%

Alteration of Igneous Rocks at Deep Sea Drilling Project Sites 458 and 459, Mariana Fore-Arc Region: Relationship to Basement Structure

Natland¹,

Mahoney²

1982

Initial Reports of the Deep Sea Drilling Project

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Secondary minerals filling veins and vesicles in volcanic basement at Deep Sea Drilling Project Sites 458 and 459 indicate that there were two stages of alteration at each site: an early oxidative, probably hydrothermal, stage and a later, low-temperature, less oxidative stage, probably contemporaneous with faulting in the tectonically active Mariana forearc region. The initial stage is most evident in Hole 459B, where low-Al, high Fe smectites and iron hydroxides formed in vesicles in pillow basalts and low-Al palygorskite formed in fractures. Iron hydroxides and celadonite formed in massive basalts next to quartz-oligoclase micrographic intergrowths. Palygorskite was found in only one sample near the top of basement in Hole 458, but it too is associated with iron hydroxides. Palygorskite has previously been reported only in marine sediments in DSDP and other occurrences. It evidently formed here as a precipitate from fluids in which Si, Mg, Fe, and even some Al were concentrated. Experimental data suggest that the solutions probably had high pH and somewhat elevated temperatures. The compositions of associated smectites resemble those in hydrothermal sediments and in basalts at the Galapagos mounds geothermal field.The second stage of alteration was large-scale replacement of basalt by dioctahedral, trioctahedral, or mixed-layer clays and phillipsite along zones of intense fracturing, especially near the bottom of Holes 458 and 459B. The basalts are commonly slickensided, and there are recemented microfault offsets in overlying sediments. Native copper occurs in one core of Hole 458, but associated smectites are dominantly dioctahedral, unlike Hole 459B, where they are mainly trioctahedral, indicating nonoxidative alteration. The alteration in both holes is more intense than at most DSDP ocean crust sites and may have been augmented by water derived from subducting ocean crust beneath the fore-arc region.

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Section: X-ray Diffraction Characteristics and Composition Of Palygormentioning

confidence: 79%

Alteration of Igneous Rocks at Deep Sea Drilling Project Sites 458 and 459, Mariana Fore-Arc Region: Relationship to Basement Structure

Natland¹,

Mahoney²

1982

Initial Reports of the Deep Sea Drilling Project

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“…It occurs in varied natural environments from soils of arid regions (Bachman and Machette, 1977;Watts, 1980), to peri-marine and marine sedimentary environments (Bowles et al, 1971;Galán and Ferrero, 1982;Weaver, 1984;Pletsch et al, 1996). However, it has been mostly described as crystallizing directly from solutions in lacustrine environments (e.g., Galán and Pozo, 2011, and references therein).…”

Section: Introductionmentioning

confidence: 97%

Varied crystallization conditions for Neogene sepiolite and associated Mg-clays from Madrid Basin (Spain) traced by oxygen and hydrogen isotope geochemistry

Clauer

Fallick

Galán

et al. 2012

Geochimica et Cosmochimica Acta

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“…There are few references in the literature in which sepiolite and palygorskite occur in the same or adjacent localities. For example, they are described together in the following Spanish deposits: Tajo Basin, (Leguey et al" 1995;Galán and Castillo, 1984), Tabladillo (M artín Pozas et al, 1981); Lebrija (Galán and Ferrero, 1982); and also in central and central-southern Tilllisia (Zaaboub et al" 2005), in the Serinhisar-Acipayam Basin (Turkey) (Akbulut and Kadir, 2003), and in the deep-sea mid-Atlantic ridge, of hydrothennal origin (Bowles et al" 1971). In the Allou Kagne deposit, sepiolite and palygorskite appear together.…”

Section: Introductionmentioning

confidence: 99%

Crystallochemical characterization of the palygorskite and sepiolite from the Allou Kagne deposit, Senegal

Romero

Suárez

Santarén³

et al. 2007

Clays and clay miner.

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Abstract-The Allou Kagne (Senegal) deposit consists of differ ent proportions of palygorskite and sepiolite, and these are associated with small quantities of quartz and X-ray amorphous silica as impurities.No pure palygorskite or sepiolite has been recognized by X-ray diffraction. Textural and microtextural features indicate that fibrous clay minerals ofthe Allou Kagne deposit were formed by direct precipitation from solution. Crystal-chemistry data obtained by analyticalltransmission electron microscopy (AEMI TEM) analyses of isolated fibers show that the chemical composition of the particles varies over a wide range, from a composition corresponding to palygorskite to a composition intermediate between that of sepiolite and palygorskite, but particles with a composition corresponding to sepiolite have not been found.Taking mto account the results from selected area electron diffraction and AEM-TEM, fibers of pure palygorskite and sepiolite have been found but it cannot be confirmed that all of the particles analyzed correspond to pure palygorskite or pure sepiolite because both minerals can occur together at the crystallite scale. In addition, the presence ofMg-rich palygorskite and very Al-rich sepiolite can be deduced.

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Precipitation of deep-sea palygorskite and sepiolite

Cited by 52 publications

References 6 publications

Alteration of Igneous Rocks at Deep Sea Drilling Project Sites 458 and 459, Mariana Fore-Arc Region: Relationship to Basement Structure

Alteration of Igneous Rocks at Deep Sea Drilling Project Sites 458 and 459, Mariana Fore-Arc Region: Relationship to Basement Structure

Varied crystallization conditions for Neogene sepiolite and associated Mg-clays from Madrid Basin (Spain) traced by oxygen and hydrogen isotope geochemistry

Crystallochemical characterization of the palygorskite and sepiolite from the Allou Kagne deposit, Senegal

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