Marine transgressions

Hernandez R, Jordan T, Dalenz Farjat A, Echavarrfa L, Idleman B, Reynolds J (2005) Age, distribution, tectonics and eustatic controls of the Paranense and Caribbean marine transgressions in southern Bolivia and Argentina. J South Am Earth Sci 19 495-512 Hillel D (1982) Introduction to Soil Physics. Academic Press, New York Hoorn C (2006) The birth of the mighty Amazon. Scientific American 294 52-59... 

Table I describes the coal samples studied. The coals examined came from very different geographical areas including French coal samples from the Deutch SBN coal bank and from CERCHAR, and New Zealand coal samples from the N.Z. Geological Survey (16). In the Provence coalfield, as in most New Zealand coalfields, and most coalfields over the world, seams having a strong marine influence are high in sulfur, and sulfur content decreases with increasing stratigraphic depth below marine beds (16). These observations suggest that freshwater peat deposits incorporated sulfur by downward diffusion of marine sulfide after marine transgression.

Rivers and shallow groundwater are often saline in arid or semiarid regions. Examples are common in northeastern Brazil in crystalline rocks, remote from the sea, and in regions where no marine transgression has occurred for 100 million years. Hence, evaporation was for a long time... 

Simonson B. M. and Hassler S. W. (1996) Was the deposition of large Precambrian iron formations linked to major marine transgressions J. Geol. 104, 665-676. 

Allen, J.R.L. (1990a) The Severn Estuary in southwest Britain its retreat under marine transgression, and fine-sediment regime. Sedimentary Geology 96, 13-28. 

The sediments of the marine transgression are represented by the wave- and tidal-dominated sandstones and interbay mudstones of the Upper Marine Molasse. Within the Upper Marine Molasse, four major facies belts can be recognized (i) the proximal fan delta facies, (ii) the coastal facies, (iii) nearshore facies and (iv) the offshore facies (Homewood, 1981). The cumulative thickness of the unit may be as much as 1.3 km (Matter et ai, 1980). 

Based on the apparent occurrence of 24-n-prop-24(28)-enylcholesterol (a C30 sterol) only in certain extant marine members of the chrysophytes (order Sarcinochrysidales Bdlard et al. 1990), the presence of the corresponding 24-n-propylcholestanes in oils and ancient sediments is considered to indicate a contribution from marine algae (Moldowan et al. 1990). Low levels of these C30 steranes have been detected in some coals, in which they can be interpreted as resulting from a marine transgression, and are often accompanied by other signs of marine contributions (e.g. lower relative abundance of C29 steranes and elevated chedanthane content Kdlops et al. 1994). 

The OAEs coincided with marine transgressions, and the associated release of nutrients from the flooded continental margins is likely to have helped to fuel primary production (Jenkyns 1999). Increased tectonic activity would have raised volcanic emissions of C02, which could also have contributed to higher productivity in a number of ways associated with the resulting climatic warming ... 

Unit C encompasses the basal sediments of a marine transgression. As the sea level continued rising the eroded material coming from the tidal flats, the intertidal zones, the lagoons and the volcanic expanses of the Lower Series was deposited on the coastal sea floors under a shallow water cover. Most of these materials were derived from the reworking of the Cambro-Ordovician sediments and transported along the coast by coastal currents. 

Global rises of sea level cause marine transgressions and favor the deposition of blanket petroleum source beds across continental shelves. Today the flow of cold dense oxy genated polar water into the ocean basins of lower lat-... 

Webb P-N (1972) Wright Fjord, Pliocene marine transgression of an Antarctic dry valley. Antarctic J US 7(6) 225-232... 

The Verrucano Lombardo formation overlies, often unconformably, the Collio formation. Consisting of reddish conglomerates, sandstones and siltstones, its depositional environment evolves from that of high energy to a more mature environment that is indicative of the Triassic marine transgression. 

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