Environment deltaic

Grimalt JO, Gomezbelinchon JI, Llop R, Albaiges J (1988) Water-phase distribution of hexachlorobenzene in a deltaic environment (Ebro delta, Western Mediterranean). Chemo-sphere 17(10) 1893-1903... 

Galceran, J.T., F.J. Santos, J. Caixach, and J. Rivera. 1993. PCBs and chlorinated pesticides in shellfish of a deltaic environment. Chemosphere 27 1183-1200. 

Relatively low permeability alluvial soils (silt, clay, and sandy clay), which corresponds with perching layers or aquitards. These soils were interpreted to be deposited in a low-energy, suspended load, fluvial-deltaic environment outside of channel zones. 

Gomez-Belinchon, J.I., Llop, R., Grimalt, J.O., and Albaiges, J. (1988) The decoupling of hydrocarbons and fatty acids in the dissolved and particulate water phases of a deltaic environment. Mar. Chem. 25, 325-348. 

The magnitude of this loss is thus substantial, and comparable to flux estimates for the delivery of terrigenous OC to the oceans (Figure 1). However, while the above studies imply low burial efficiencies for fluvial POM in deltaic environments, it is uncertain whether the apparent losses of riverine POM reflect its complete mineralization or export to the ocean interior either in dissolved or particulate form (Edmond et al., 1981). Moreover, the extent of terrestrial OC export and burial from river systems that do not form deltaic deposits is less weU constrained. 

Organic matter can provide important clues for paleoenvironmental assessments (Table 5) (de Leeuw etal., 1995). Because some biomarkers point to specific taxa, they can also act as indicators of specific habitats. Paleoenvironmental conditions that are often readily inferred from the presence and distribution patterns of biomarkers are marine (e.g., (66d)), terrestrial (e.g., (61)), and deltaic environments where plant and algal hydrocarbons are mixed or show stratigraphy-related flucmations in abundance. 

Oil sand deposits are present in many locations around the world, and they comprise an oil capacity of some 1440 to 2100 billion barrels (4, 5), most of which is contained in Canada and Venezuela (almost as much as the world s total discovered medium- and light-gravity oils). The major world deposits are fairly similar and occur along the rim of major sedimentary basins in either fluviatile or deltaic environments (4—10). 

Oil sand deposits are present in many locations around the world and appear to be similar in many respects (4-6), occurring along the rim of major sedimentary basins, mainly in either fluviatile or deltaic environments containing sands of high porosity and permeability. Reviews are available for most locations worldwide (4, 6-13). Although superficially similar, not all deposits are the same when subjected to a detailed examination. There are significant variations in composition... 

Lignin is a structural component of plant tissues where it ocems as a three-dimensional network together with cellulose. Lignin is a macromolecular condensation product of three different propenyl (C3-substituted) phenols (one type of few biogenic aromatic compoimds). It is preserved, even dining transport from land to ocean and during sedimentation to the seafloor where it occurs predominantly in hiunic organic matter of deltaic environments. 

The sandstones of Unit B were deposited in a fluvial-deltaic environment or, more precisely, in the coastal barrier islands and the delta mouths. 

Coals are formed in swamps under warm climatic conditions that promote rapid vegetative growth. Coal deposits are generally associated with mountain-building events and deltaic environments. Coals can be traced to the Devonian period, when woody plants first evolved, about 370 million years before the present. 

---