DBPapers
DOI: 10.5593/sgem2011/s01.134

SEDIMENTARY ROCKS, DEPOSITIONAL ENVIRONMENTS AND SEQUENCE STRATIGRAPHIC IN BURDIGALIAN AND BADENIAN DEPOSITS OF SLANIC PRAHOVA – ALUNIS (ROMANIA)

AUTHOR/S: R. М. FECHET
Monday 1 August 2011 by Libadmin2011

11th International Multidisciplinary Scientific GeoConference SGEM2011, www.sgem.org, SGEM2011 Conference Proceedings/ ISSN 1314-2704, June 20-25, 2011, Vol. 1, 251-258 pp

ABSTRACT

Sedimentary analysis was based on formations of inferior Molasse which belong to
Burdigalian and Badenian, being performed in representative natural claddings from
Prahova, Romanian area. Complete successions of Variegated Formation and
Globigerina – bearing Tuffs and Marls Formation may be followed in V. Mare – Alunis
and Slanic–Piatra Verde Quarry (Prahova). The Variegated Formation is mostly ruditic–
arenitic at its base, grading into a silty–lutitic sequence at the top. It mainly consists of
conglomerates and micro-conglomerates, gray–blackish, sometimes reddish micaceous
silty marls, gray or red siltstones fine-grained sandstones and sands. The gypsum
intercalations are frequently. Regarding on assembly, sequences on facies, delimited
based on some erosion discontinuities or non-erosion may be grouped in mezzosequences
which are characterized by a rhythmic alternation of petrofacieses of type
sandstone–siltit–marl and divided by surfaces of major discontinuity. Majority of
mezzo-sequences have the tendency to develop of type “finning–upward”. The
Globigerina – bearing Tuffs and Marls Formation consists of dacitic tuffs and cineritic
marls, greenish-bluish with intercalations of fine sandstones. It is a very good
cartographic mark. At Piatra Verde, on north-western versant, the limit with variegated
formation is clearly marked. It consists of granofacies lutitic, fine dominated by grey
marls, tufacee and greenish tuffs. Rare intercalations of thin arenite, sands and fine
sandstones are present. There are very well remarkable, even macroscopic, the
globigerines. Associated also in couples and in succession of terms, litons form normal
or inverse micro-sequences which were grouped in separate mezzo-sequences through
erosion discontinuities. The mezzo-sequences are of type „finning- upward”. The main
source of supply was tall orogenic pass which supply big volumes of different clastic
rocks, as turbidite and flows in mass. Lower Miocene begins with a crisis of salinity
installed on background of limitations the connection between extra-Carpathians basin
range and neighbor ranges and evolution toward a basin with restrictive circulation. In
the basin are powerful felt influences of neighbor land characterized by high energy of
relief and which supply a rich and varied sedimentary material. Locally, for short
intervals of time there are retrieved conditions of sedimentation of supratidal type.
Terminal Burdigalian evolutes in conditions of a restrictive brackish sedimentary basin,
with frequent ingressions of sea waters, in conditions of small depth and fluctuant
salinity. Middle Miocene was accumulated in an environment of sedimentation, marine
strictly, of water with small depth - “shallow-water”, nearby sources of terrigenous
contribution, with sediments predominant fine, demonstrating a low energy of basin. On
assembly it may appreciate an evolution of the basin in epicontinental marine conditions
with corresponding depths of a shelf.

Keywords: sequence stratigraphic, depositional environments, „finning -up”, “shallow
– water”

PAPER 2011/s01.134: SEDIMENTARY ROCKS, DEPOSITIONAL ENVIRONMENTS AND SEQUENCE STRATIGRAPHIC IN BURDIGALIAN AND BADENIAN DEPOSITS OF SLANIC PRAHOVA – ALUNIS (ROMANIA)

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