Recent sediments

Shimp, N.F. Schlercher, J.S. Ruch, R.R. Heck, D.B. Leland, H.V. Trace Element and Organic Carbon Accumlation in the Most Recent Sediments of Southern Lake Michigan. Environ. Geo. 1971 Notes 41, 25. 

The occurrence of C and C9 dicarboxylic acids in samples of atmospheric particles and in recent sediments (Stephanou 1992 Stephanou and Stratigakis 1993) has been attributed to photochemical degradation of unsaturated carboxylic acids that are widespread in almost all biota. 

Appleby PG. 2001. Chronostratigraphic techniques in recent sediments. In Last WM, Smol JP, editors. Tracking environmental change using lake sediments. Vol. 1 Basin analysis, coring, and chronological techniques. Dordrecht, the Netherlands Kluwer Academic Publishers, p. 171-203. 

Blumer, M., Youngblood, W. W., Polycyclic Aromatic Hydrocarbons in Soils and Recent Sediments, Science, 188, 53 (1975). 

Boehm, P.D. and J.W. Farrington. 1984. Aspects of the polycyclic aromatic hydrocarbon geochemistry of recent sediments in the Georges Bank region. Environ. Sci. Technol. 18 840-845. 

Rowlett, S.M. (1980) PhD Thesis. Geochemical Studies of Recent Sediments from Cumbria, UK, University of Liverpool. 

LaFlamme RE, Hites RA, Tetra-and pentacyclic, naturally-occurring, aromatic hydrocarbons in recent sediments, Geochim Cosmochim Acta 43 1687—1691, 1979. 

Simoneit BRT, Mazurek MA, Brenner S, Crisp PT, Kaplan IR, Organic geochemistry of Recent sediments from Guaymas Basin, Gulf of California, Deep-Sea Research 26A K73- 3, 1979. 

Behrens, A. Schaeffer, P. Albrecht, P. (2000) Occurrence of precursors of r ular tricyclopolyprenoids in recent sediments. Org. Lett., 2, 361-3. 

One of the few clay minerals to be identified as definitely having an origin at the sediment-water interface is glauconite, i.e., the green micaceous material which forms pellet-like agglomerates. This has been conclusively demonstrated in recent sediments (Porrenga, 1967b Lamboy,... 

The crystallization of berthierine, i.e., 7 8 chlorite or aluminous serpentine, on shallow ocean shelves and estuaries at the sediment surface is well known in recent sediments. There are also instances where this material is found in sedimentary rocks (Velde, et al.. 1974). 

One aspect of sedimentary 7 8 chlorite formation which is particularly interesting is the fact that these minerals are never found forming at depths greater than 80 meters in recent sediments. Porrenga (1967b) thinks that they are characteristic of tropical sediments and their formation is thus temperature dependent. This appears invalid since they are known to form in recent sediments in a Scottish loch (Rohrlich, e al.. 1969). Nevertheless there does seem to be a bathymetric control on their occurrence. This is probably not a pressure effect but more likely some sort of factor related to organic activity in the sediments which is controlled by the biotic factors of sea depth, temperature, nutrients, etc. 

The most important character of all of the berthierine compositions is their low silica content. The variation of compositions found for pellets from the recent sediments appears to be the result of the crystallization of a chlorite structure with full octahedral occupancy. The meta-berthierines fall within the limits deduced for synthetic magnesian 7 X chlorites, limits which are also near full octahedral occupancy. 

PORRENGA (D.H.), 1966. Clay minerals in recent sediments. Clays and Clay Min. 14, 221-33. 

ROHRLICH (V.), PRICE (N.B.) and CALVERT (S.E.), 1969. Chamosite in recent sediments of Loch Etive Scotland. Journ. Sed. Petr. 39, 624-31. 

Xia and Ball (1999) measured sorption isotherms for a series of chlorinated benzenes and PAHs for an aquitard material (foc = 0.015 kg oc kg-1 solid) from a formation believed to date to the middle to late Miocene. Hence, compared to soils or recent sediment POM, the organic matter present in this aquitard material can be assumed to be fairly mature and/or contain char particles from prehistoric fires. A nonlinear isotherm was found for TeCB (fitting Eq. 9-2) and the following Freundlich parameters were reported XreCBF = 128(mg g 1)(mg mL 1) "T CBand "TeCB = 0.80. For partitioning of TeCB to this material (linear part of the isotherm at higher concentrations), the authors found a Kioc value of 4.2 x 104 L kg oc. 

Ratios of Organic Carbon, Nitrogen, and Hydrogen in Recent Sediments... 

The vertical variation of the ratios of Org. N/Org. H in the same core sample shows that with a few exceptions the ratios increase regularly with increasing core depth. This means the organic hydrogen is more easily decomposed than organic nitrogen in recent sediments. 

First reported in recent marine sediments in 1967 275) have since been found in several marine basins 140, 141) Cooper and Blumer 140) suggested that the isoprenoid acids may provide markers for the contribution of animals lipids to the organic matter of recent sediments... 

Sterols were first found in recent marine sediments in 1964 281) since been reported by other workers 282, 283). No affirmative findings are available on triterpenes in recent sediments. Lipids form up to 20% of soil humus 284) ... 

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