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Eolian

Figure 21. ( Ra/ Ra)-K/( Ra) diagram proposed by Voltaggio et al. (1995). In this diagram, equivalent to a ( Ra/ °Th)-K/( °Th) diagram, are reported the data resulting from successive leachings of K-rich volcanic rocks from Vulcano (Eolian Islands). For each rock, the data define a straight line, whose intercept on the y-axis gives the ( Ra/ h) ratio of the Th-emiched accessory phase and thus the age of the rock (UCS 2.9 0.4 ka DS 2.1 0.3 ka PLZ 1.5 0.2 ka). K/( Ra) ratios are expressed in weight % K/dpm.g (results from Voltaggio et al. 1995 see text for a detailed explanation). Figure 21. ( Ra/ Ra)-K/( Ra) diagram proposed by Voltaggio et al. (1995). In this diagram, equivalent to a ( Ra/ °Th)-K/( °Th) diagram, are reported the data resulting from successive leachings of K-rich volcanic rocks from Vulcano (Eolian Islands). For each rock, the data define a straight line, whose intercept on the y-axis gives the ( Ra/ h) ratio of the Th-emiched accessory phase and thus the age of the rock (UCS 2.9 0.4 ka DS 2.1 0.3 ka PLZ 1.5 0.2 ka). K/( Ra) ratios are expressed in weight % K/dpm.g (results from Voltaggio et al. 1995 see text for a detailed explanation).
Capaldi G, Cortini M, Pece R (1982) Th isotopes at Vesuvius evidence for open-system behavior of magma-forming processes. J Volcanol Geotherm Res 14 247-260 Capaldi G, Cortini M, Pece R (1983) U and Th decay-series disequilibria in historical lavas from the Eolian islands, Tyrrhenian Sea. Isot Geosci 1 39-55... [Pg.304]

A survey of available Th data for the ocean basins demonstrated that the highest concentrations are found nearer to the coasts, and it was concluded that while eolian inputs likely dominated the budget in the open ocean and could account for increases near the coast, fluvial inputs may be more important in coastal regions. This implies that some a mechanism causes recycling of Th that has been removed to estuarine sediments (Huh et al. 1989). A study of an ice-covered region of the western Arctic Ocean found that significant amounts of °Th and Th were advected into the basin (Edmonds et al. 1998). Therefore, it appears that while long-lived Th isotopes are rapidly removed into estuarine sediments, transport into the ocean basins may continue. [Pg.593]

The finest particles composed of fine silt and clay are carried over much larger distances (Fig. 1.6). Using oxygen isotopes of aeolian quartz, it has been shown that significant quantities of dust with an average diameter of 1-10 microns are transported by jet streams from desert zones over the rest of the world. Eolian admixtures have been referred to explain the presence of Si02 in soils developed in non-quartz-containing volcanic rocks in Hawaii and Israel. [Pg.30]

Higher quartz contents in soils occur in areas where the soil parent materials include quartz-rich materials, such as sandstone bedrock or eolian deposits (area 3 Fig. 2) and in regions where high precipitation accelerates soil weathering and leaching, resulting in high contents of residual, inert quartz (areas 9 and 10 Fig. 2). In Fig. 2 the distribution of Al is nearly... [Pg.194]

Spatial assessment of trace elements in Taylor Valley Antarctic Glaciers Dominance of eolian deposition... [Pg.207]

KEYWORDS eolian deposition, Antarctica, snow, trace elements... [Pg.207]

Lithogenic eolian deposition is a primary chemical contributor to TV snow (Lyons et a ., 2003 Williamson et al., 2007 ... [Pg.207]

Witherow et al., 2006). Eolian transport of local soils and lake sediments is a documented dispersal mechanism for valley floor life as well as life immured in glacier ice and cryoconite holes (Christener et al., 2003 Nkem et al.,... [Pg.207]

Eolian deposition dominates the deposition of trace elements on TV snow. [Pg.209]

Wind exposure is, therefore, important controls of eolian deposition. Howard Glacier snow was the most wind exposed and had the greatest trace element concentrations... [Pg.209]

Figure 7.9. Effect of drying temperature on the analysis of a Brookston silty loam developed from glacial till and eolian silt, kg/ha is kilogram per hectare and ppm is parts per million (selected data adapted from Molloy and Lockman [12]). Figure 7.9. Effect of drying temperature on the analysis of a Brookston silty loam developed from glacial till and eolian silt, kg/ha is kilogram per hectare and ppm is parts per million (selected data adapted from Molloy and Lockman [12]).
At this point, nothing is known about Cu and Zn isotopic variability in seawater. Zn is very depleted in surface waters because it behaves as a nutrient. A substantial amormt of Zn isotope data is available for sediments. Marechal et al. (2000) found that the 5 Zn values of clay minerals from different environments (Paleozoic shales, including a black shale, Mediterranean sapropels. Pacific and Atlantic sediments, a eolian dust) fall within a narrow range (0.17-0.35%o) centered around the magmatic values and therefore reflect the Zn isotope composition... [Pg.416]

Simoneit BRT, Organic matter in eolian dusts over the Atlantic Ocean, Mar Chem 5 443-464, 1977. [Pg.120]

Simoneit BRT, Biogenic Hpids in eolian particulates collected over the ocean, in NovakovT ed), Proceedings Carbonaceous Particles in the Atmosphere NSF-LBL, pp. 233-244, 1979. [Pg.120]

Grotzinger, J. P. plus 19 coauthors (2005) Stratigraphy and sedimentology of a dry to wet eolian depositional system, Bums formation, Meridiani Planum, Mars. Earth and Planetary Science Letters, 240, 11-72. [Pg.480]

Loess refers to deposits of fine-grained wind-blown (eolian) sediments, which may accumulate up to 100 m thick. The material mostly consists of silt grains with perhaps 5-30% clay-sized particles and 5-10% sand (Benn and Evans, 1998), 291. Like other sediments, loess may contain considerable arsenic depending on the chemistry of its source rocks (Table 3.15). [Pg.168]

Eolian Describes materials that have been transported by wind or landforms that are created by wind. [Pg.448]

Beccaluva L, Gabbianelli G, Lucchini F, Rossi PL, Savelli C (1985b) Petrology and K/Ar ages of volcanics dredged from the Eolian seamounts implications for geodynamic evolution of the southern Tyrrhenian basin. Earth Planet Sci Lett 74 187-208... [Pg.325]

The alternation of limestone and island-wide terra-rossa paleosols has formed the principal basis for subdivision of the stratigraphic column. However, Pleistocene sea level oscillations of finer time and elevation scale have resulted in intercalation of marine and eolian grainstones, and in some cases, formation of poorly developed, brownish soil horizons of local extent ("accretionary soils"). These latter stratigraphic features and their interpretation are to some extent the reason for the differences in stratigraphic subdivisions shown in Table 7.3. [Pg.332]

Total river + Eolian phosphorus flux Total prehuman potentially reactive 10.8-17.8... [Pg.349]

Romero, O.E., Dupont, L., Wyputta, U., Jahns, S., and Wefer, G (2003) Temporal variability of fluxes of eolian-transported freshwater diatoms, phytoliths, and pollen grains off Cape Blanc as reflection of land-atmosphere-ocean interface in northwest Africa. J. Geophys. Res. 108, 3153. [Pg.654]


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See also in sourсe #XX -- [ Pg.331 ]

See also in sourсe #XX -- [ Pg.363 ]




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