The sequence stratigraphy of the middle Eocene-Pliocene of the Pannonian
Basin permits to differentiate fifty-nine depositional sequences.
An earlier compressional Paleogene basin in the central and eastern
Pannonian Basin is unconformably overlain by a Neogene extensional basin.
Tectonic regimes interacted with transgressive-regressive facies cycles. The
boundaries of these cycles coincide with regional stage boundaries.
Unconformities separating these cycles mark the episodic closure of connections
between the Pannonian Basin and the European epicontinental seas from
Oligocene through middle Miocene time. The unconformities are the result of
short-term glacio-eustatic falls, sometimes enhanced by tectonic events.
Within the limits of biostratigraphic resolution during the Eocene-middle
Miocene, many of the sequences of the Pannonian Basin correlate well with the
sequences proposed by Haq et al. (1987). However, eight sequences, i.e. one in
the Lutetian, three in the Bartonian, one in the Priabonian, one in the Rupelian
and two in the Burdigalian, were not identified by Haq et al. (1987).
The sequences and their boundaries are directly correlated with global
oxygen isotope events. Glacioeustasy generates sequence boundaries beginning
as early as the middle Eocene.
Within the lacustrine setting of the Pannonian Basin (late Miocene-
Pliocene time) relative lake level changes appear to control the overall sequence
development. However, other minor variables, the sediment supply and the
topography of the initial depositional surface were additional controlling factors.
Thus differences in the physiography of the basin lead to totally different
sequence types that all reflect to lake level fluctuations. In lateral direction,
during a short time period, these lacustrine sequences are more sensitive to
changes in the initial depositional profile and sediment supply. / pages 390 and 396 are missing from text.
| Identifer | oai:union.ndltd.org:RICE/oai:scholarship.rice.edu:1911/20480 |
| Date | January 1997 |
| Source Sets | Rice University |
| Language | English |
| Detected Language | English |
| Type | Thesis, Text |
| Format | application/pdf |
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