DACIAN BASIN - GeoEcoMar

The evolution and architecture of a sedimentary basin fill are controlled to a large
extent, by the availability and the magnitude of the clastic material input, and the
properties of the basin.
9.1. INvESTIgATION METHOD
The identification of the major sedimentary factors such as the source-area and the
accumulation areas requires an overall image of the studied basin. The isopachs
included in the lithofacies and paleogeographical maps of the Dacian Basin (Saulea
et al., 1969) offer the entire picture of the distribution of sediment thickness in the
Dacian Basin area. Consequently the contour maps represented the main source of
information for the identification of the Dacian Basin source-areas and depocenters
areas.
Other ways of approach used for the detection of the source-areas system are
lithology distribution and paleocurrent directions. The sediment thickness distribution
offers an estimation of the general location of the source-areas. The lithology
and paleocurrent maps indicate sectors where detrital material was introduced in
the basin (sediment input points).
Two sets of lithologic sketches were used to locate the sediment input points.
The distribution of the coarsest-grained accumulated sediments was the criterion
to locate the areas of detrital material input, and, implicitly, to estimate the sourceareas
of the supplied material.
Paleocurrent directions were acquired through the measurement of the current
structures orientation. The sole marks, but mostly cross lamination were used
to measure the paleocurrent directions of the sedimentary structures.
9.2. MAJOR FEATURES OF THE DACIAN BASIN ISOPACH MAPS
USED AS SOURCE-AREA INDICATORS
As discussed in a previous chapter, the isopach maps emphasize two important features
of the sediment thickness distribution in the development of the Dacian Basin.
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Chapter 9
SOURCE-AREAS IN THE gEOLOgICAL
HISTORY OF THE DACIAN BASIN